HomeMy WebLinkAboutAuburn Drainage Plan Draft - Appendices.pdf
Comprehensive Storm
Drainage Plan
Volume 2 - Appendices
Prepared for the
Community Development and
Public Works Department
City of Auburn, Washington
April 2015
DRAFT
701 Pike St., Suite 1200
Seattle, WA 98101
Comprehensive Storm Drainage Plan
Volume 2 - Appendices
Prepared for the
Community Development and Public Works Department
City of Auburn, Washington
April 2015
This is a draft and is not intended to be a final representation
of the work done or recommendations made by Brown and Caldwell.
It should not be relied upon; consult the final report.
DRAFT
v
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.
Auburn Drainage Plan Draft - Appendices.docx
Table of Contents
Appendix A: Western Washington Phase II Municipal Stormwater Permit ............................................ A-1
Appendix B: Phase II NPDES Stormwater Permit Compliance Work Plan ............................................ B-1
Appendix C: Hydrologic and Hydraulic Modeling and Evaluation ...........................................................C-1
Appendix D: SEPA Compliance ................................................................................................................ D-1
Comprehensive Storm Drainage Plan
A-1
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.
Auburn Drainage Plan Draft - Appendices.docx
Appendix A: Western Washington Phase II Municipal
Stormwater Permit
Issuance Date:
Effective Date:
Expiration Date:
Modification Date:
August 1, 2012
August 1, 2013
July31,2018
January 16, 2014
Western Washington Phase II Municipal
Stormwater Permit
National Pollutant Discharge Elimination System and
State Waste Discharge General Permit
for discharges from Small Municipal Separate Storm Sewers
in Western Washington
State of Washington
Department of Ecology
Olympia, Washington 98504-7600
In compliance with the provisions of
The State of Washington Water Pollution Control Law
Chapter 90.48 Revised Code of Washington
and
The Federal Water Pollution Control Act
(The Clean Water Act)
Title 33 United States Code, Section 1251 et seq.
Until this permit expires, is modified, or revoked, Permittees that have properly obtained
coverage under this permit are authorized to discharge to waters of the state in accordance with
the special and general conditions which follow.
~ther R. Bartlett
Wa er Quality Program Manager
Department of Ecology
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 2 of 74
THIS PAGE INTENTIONALLY LEFT BLANK
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 3 of 74
TABLE OF CONTENTS
SPECIAL AND GENERAL CONDITIONS
SPECIAL CONDITIONS ............................................................................................................... 5
S1. PERMIT COVERAGE AREA AND PERMITTEES ........................................... 5
S2. AUTHORIZED DISCHARGES ......................................................................... 10
S3. RESPONSIBILITIES OF PERMITTEES ........................................................... 11
S4. COMPLIANCE WITH STANDARDS............................................................... 12
S5. STORMWATER MANAGEMENT PROGRAM FOR CITIES, TOWNS, AND
COUNTIES ......................................................................................................... 15
S5.C.1 Public Education and Outreach .................................................................................... 17
S5.C.2 Public Involvement and Participation .......................................................................... 19
S5.C.3 Illicit Discharge Detection and Elimination ................................................................. 19
S5.C.4 Controlling Runoff from New Development, Redevelopment and Construction Sites 25
S5.C.5 Municipal Operations and Maintenance ...................................................................... 35
S6. STORMWATER MANAGEMENT PROGRAM FOR SECONDARY
PERMITTEES ..................................................................................................... 39
S7. COMPLIANCE WITH TOTAL MAXIMUM DAILY LOAD
REQUIREMENTS .............................................................................................. 48
S8. MONITORING AND ASSESSMENT ............................................................... 48
S9. REPORTING REQUIREMENTS ....................................................................... 56
GENERAL CONDITIONS .......................................................................................................... 59
G1. DISCHARGE VIOLATIONS ............................................................................. 59
G2. PROPER OPERATION AND MAINTENANCE .............................................. 59
G3. NOTIFICATION OF DISCHARGE, INCLUDING SPILLS ............................. 59
G4. BYPASS PROHIBITED ..................................................................................... 59
G5. RIGHT OF ENTRY ............................................................................................ 60
G6. DUTY TO MITIGATE ....................................................................................... 60
G7. PROPERTY RIGHTS ......................................................................................... 60
G8. COMPLIANCE WITH OTHER LAWS AND STATUTES .............................. 60
G9. MONITORING ................................................................................................... 60
G10. REMOVED SUBSTANCES ............................................................................... 62
G11. SEVERABILITY ................................................................................................ 62
G12. REVOCATION OF COVERAGE ...................................................................... 62
G13. TRANSFER OF COVERAGE ............................................................................ 63
G14. GENERAL PERMIT MODIFICATION AND REVOCATION ........................ 63
G15. REPORTING A CAUSE FOR MODIFICATION OR REVOCATION ............ 63
G16. APPEALS ............................................................................................................ 63
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 4 of 74
G17. PENALTIES ........................................................................................................ 64
G18. DUTY TO REAPPLY ......................................................................................... 64
G19. CERTIFICATION AND SIGNATURE ............................................................. 64
G20. NON-COMPLIANCE NOTIFICATION ............................................................ 65
G21. UPSETS ............................................................................................................... 65
DEFINITIONS AND ACRONYMS ............................................................................................ 67
APPENDICES
APPENDIX 1. MINIMUM TECHNICAL REQUIREMENTS
APPENDIX 2. TOTAL MAXIMUM DAILY LOAD REQUIREMENTS
APPENDIX 3. ANNUAL REPORT FOR CITIES, TOWNS AND COUNTIES
APPENDIX 4. ANNUAL REPORT FOR SECONDARY PERMITTEES
APPENDIX 5. NOTICE OF INTENT
APPENDIX 6. STREET WASTE DISPOSAL
APPENDIX 7. DETERMINING CONSTRUCTION SITE DAMAGE TRANSPORT
POTENTIAL
APPENDIX 8. ANNUAL REPORT FOR NEW PERMITTEES
APPENDIX 9. STORMWATER DISCHARGE MONITORING
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 5 of 74
SPECIAL CONDITIONS
S1. PERMIT COVERAGE AREA AND PERMITTEES
A. Geographic Area of Permit Coverage
This Permit is applicable to owners or operators of regulated small municipal separate
storm sewer systems (MS4s) located west of the eastern boundaries of the following
counties: Whatcom, Skagit, Snohomish, King, Pierce, Lewis and Skamania.
1. For all cities required to obtain coverage under this permit, the geographic area of
coverage is the entire incorporated area of the city.
2. For all counties required to have coverage under this Permit, the geographic area
of coverage is the urbanized areas and urban growth areas associated with
permitted cities under the jurisdictional control of the county. The geographic area
of coverage also includes any urban growth area contiguous to permitted
urbanized areas under the jurisdictional control of the county.
3. For Whatcom County, the geographic area of coverage also includes the
unincorporated Birch Bay urban growth area.
4. For Secondary Permittees required to obtain coverage under this permit, the
minimum geographic area of coverage is all areas identified under S1.A.1 and
S1.A.2. At the time of permit coverage, the Washington State Department of
Ecology (Ecology) may establish a geographic area of coverage specific to an
individual Secondary Permittee.
5. All regulated small MS4s owned or operated by the Permittees named in
S1.D.2.a(i) and (ii),and S1.D.2.b and located in another city or county area
requiring coverage under this permit or the Phase I Municipal Stormwater Permit
or the Eastern Washington Phase II Municipal Stormwater Permit are also
covered under this permit.
B. Regulated Small Municipal Separate Storm Sewer Systems (MS4s)
All operators of regulated small MS4s are required to apply for and obtain coverage
under this Permit or be permitted under a separate individual permit, unless waived or
exempted in accordance with condition S1.C.
1. A regulated small MS4:
a. Is a “Small MS4” as defined in the Definitions and Acronyms section at the
end of this Permit; and
b. Is located within, or partially located within, an urbanized area as defined by
the latest decennial census conducted by the U.S. Bureau of Census, or
S1.B.2 S1.B.5
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 6 of 74
designated by Ecology pursuant to 40 CFR 123.35(b) or 40 CFR 122.26(f);
and
c. Discharges stormwater from the MS4 to a surface water of Washington State;
and
d. Is not eligible for a waiver or exemption under S1.C. below.
2. All other operators of MS4s, including special purpose districts, which meet the
criteria for a regulated small MS4 shall obtain coverage under this Permit. Other
operators of small MS4s may include, but are not limited to: flood control, or
diking and drainage districts, schools including universities, and correctional
facilities that own or operate a small MS4 serving non-agricultural land uses.
3. Any other operators of small MS4s may be required by Ecology to obtain
coverage under this permit or an alternative NPDES permit if Ecology determines
the small MS4 is a significant source of pollution to surface waters of the state.
Notification of Ecology’s determination that permit coverage is required will be
through the issuance of an Administrative Order issued in accordance with RCW
90.48.
4. The owner or operator of a regulated small MS4 may obtain coverage under this
Permit as a Permittee, Co-Permittee, or Secondary Permittee as defined in S1.D.1.
below.
5. Pursuant to 40 CFR 122.26(f), any person or organization may petition Ecology to
require that additional small MS4s obtain coverage under this Permit. The process
for petitioning Ecology is:
a. The person or organization shall submit a complete petition in writing to
Ecology. A complete petition shall address each of the relevant factors for
petitions outlined on Ecology’s website.
b. In making its determination on the petition, Ecology may request additional
information from either the petitioner or the entity that is the subject of the
petition.
c. Ecology will make a final determination on a complete petition within 180
days of receipt of the petition and inform both the petitioner and the MS4 of
the decision, in writing.
d. If Ecology’s final determination is that the candidate MS4 will be regulated,
Ecology will issue an order to the operator of the MS4 requiring them to
obtain coverage under this Permit. The order will specify:
i. The geographic area of permit coverage for the MS4;
S1.C.1 S1.C.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
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ii. Any modified dates or deadlines for developing and implementing this
Permit, as appropriate to the MS4, and for submitting their first annual
report; and
iii. A deadline for the operator of the MS4 to submit a complete Notice of
Intent (see Appendix 5) to Ecology.
C. Owners and operators of an otherwise regulated small MS4 are not required to obtain
coverage under this Permit if:
1. The small MS4 is operated by:
a. A federal entity, including any department, agency or instrumentality of the
executive, legislative, and judicial branches of the Federal government of the
United States.
b. Federally recognized Indian Tribes located within Indian Country, including
all trust or restricted lands within the 1873 Survey Area of the Puyallup Tribe
of Indians; or
c. The Washington State Department of Transportation.
or:
2. The portions of the small MS4 located within the census defined urban area(s)
serve a total population of less than 1000 people and a, b, and c, below all apply:
a. The small MS4 is not contributing substantially to the pollutant loadings of a
physically interconnected MS4 that is regulated by the NPDES stormwater
program.
b. The discharge of pollutants from the small MS4 has not been identified as a
cause of impairment of any water body to which the MS4 discharges.
c. In areas where an EPA approved TMDL has been completed, stormwater
controls on the MS4 have not been identified as being necessary.
In determining the total population served, both resident and commuter
populations shall be included. For example:
• For publicly operated school complexes including universities and
colleges the total population served would include the sum of the
average annual student enrollment plus staff.
• For flood control, diking, and drainage districts the total population
served would include residential population and any non-residents
regularly employed in the areas served by the small MS4.
S1.D.1 S1.D.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 8 of 74
D. Obtaining coverage under this Permit
All operators of regulated small MS4s are required to apply for and obtain coverage
in accordance with this section, unless waived or exempted in accordance with
section S1.C.
1. Unless otherwise noted, the term “Permittee” shall include a city, town, or county
Permittee, New Permittee, Co-Permittee, Secondary Permittee, and New
Secondary Permittee as defined below:
a. “Permittee” is a city, town, or county owning or operating a regulated small
MS4 applying and receiving a permit as a single entity.
b. “New Permittee” is a city, town, or county that is subject to the Western
Washington Phase II Municipal Stormwater General Permit and was not
subject to the permit prior to August 1, 2013.
c. “Co-Permittee” is any owner or operator of a regulated small MS4 that is
applying in a cooperative agreement with at least one other applicant for
coverage under this Permit. Co-Permittees own or operate a regulated small
MS4 located within or in proximity to another regulated small MS4.
d. A “Secondary Permittee” is an operator of a regulated small MS4 that is not a
city, town or county. Secondary Permittees include special purpose districts
and other MS4s that meet the criteria for a regulated small MS4 in S1.B.
above.
e. “New Secondary Permittee” is a Secondary Permittee that is covered under a
municipal stormwater general permit and was not covered by the permit prior
to August 1, 2013.
2. Operators of regulated small MS4s have submitted or shall submit to Ecology
either a Notice of Intent (NOI) for Coverage under National Pollutant Discharge
Elimination System (NPDES) Municipal Stormwater General Permit provided in
Appendix 5 or a Duty to Reapply - NOI.
a. The following Permittees and Secondary Permittees submitted a Duty to
Reapply - NOI to Ecology prior to August 19, 2011:
i. Cities and towns: Aberdeen, Algona, Anacortes, Arlington, Auburn,
Bainbridge Island, Battle Ground, Bellevue, Bellingham, Black
Diamond, Bonney Lake, Bothell, Bremerton, Brier, Buckley, Burien,
Burlington, Camas, Centralia, Clyde Hill, Covington, Des Moines,
DuPont, Duvall, Edgewood, Edmonds, Enumclaw, Everett, Federal
Way, Ferndale, Fife, Fircrest, Gig Harbor, Granite Falls, Issaquah,
Kelso, Kenmore, Kent, Kirkland, Lacey, Lake Forest Park, Lake
Stevens, Lakewood, Longview, Lynnwood, Maple Valley, Marysville,
S1.D.2 S1.D.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 9 of 74
Medina, Mercer Island, Mill Creek, Milton, Monroe, Mountlake
Terrace, Mount Vernon, Mukilteo, Newcastle, Normandy Park, Oak
Harbor, Olympia, Orting, Pacific, Port Orchard, Port Angeles,
Poulsbo, Puyallup, Redmond, Renton, Sammamish, SeaTac, Sedro-
Woolley, Shoreline, Snohomish, Steilacoom, Sumner, Tukwila,
Tumwater, University Place, Vancouver, Washougal, and
Woodinville.
ii. Counties: Cowlitz, Kitsap, Thurston, Skagit, and Whatcom.
iii. Secondary Permittees: Bainbridge Island School District #303,
Bellingham School District, Bellingham Technical College, Cascadia
College, Central Kitsap School District, Centralia College, Clark
College, Consolidated Diking Improvement District #1 of Cowlitz
County, Edmonds Community College, Evergreen College, Highline
Community College, Kelso School District, Kent School District,
Longview School District, Lower Columbia College, Port of
Anacortes, Port of Bellingham, Port of Olympia, Port of Skagit
County, Port of Vancouver, Skagit County Drainage District #19,
Skagit Valley College, University of Washington Bothell, Washington
State University Vancouver, Washington State General Administration
(Capitol Campus), Washington Department of Corrections, Western
Washington University, and Whatcom Community College.
b. Operators of regulated small MS4s have submitted or shall submit to Ecology
a Notice of Intent (NOI) for Coverage under National Pollutant Discharge
Elimination System (NPDES) Municipal Stormwater General Permit provided
in Appendix 5 before the effective date of this permit, with the following
exceptions:
i. Operators of regulated small MS4s located in the Cities of Lynden and
Snoqualmie shall submit a NOI or application to Ecology no later than
30 days after the effective date of this permit.
ii. Operators of regulated small MS4s listed in S1.D.2.a do not need to
submit a new application to be covered under this permit.
c. For operators of regulated small MS4s listed in S1.D.2.a, coverage under this
permit is automatic and begins on the effective date of this permit, unless the
operator chooses to opt out of this General Permit. Any operator of a regulated
small MS4 that is opting out of this permit shall submit an application for an
individual MS4 permit in accordance with 40 CFR 122.33(b)(2)(ii) no later
than the effective date of this permit.
d. Operators of regulated small MS4s which want to be covered under this
permit as Co-Permittees shall each submit a NOI to Ecology.
S1.D.3 S2.A.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 10 of 74
e. Operators of regulated small MS4s which are relying on another entity to
satisfy all of their permit obligations shall submit a NOI to Ecology.
f. Operators of small MS4s designated by Ecology pursuant to S1.B.3 of this
permit shall submit a NOI to Ecology within 120 days of receiving
notification from Ecology that permit coverage is required.
3. Application Requirements
a. For NOIs submitted after the issuance date of this Permit, the applicant shall
include a certification that the public notification requirements of WAC 173-
226-130(5) have been satisfied. Ecology will notify applicants in writing of
their status concerning coverage under this Permit within 90 days of
Ecology’s receipt of a complete NOI.
b. Each Permittee applying as a Co-Permittee shall submit a NOI provided in
Appendix 5. The NOI shall clearly identify the areas of the MS4 for which the
Co-Permittee is responsible.
c. Permittees relying on another entity or entities to satisfy one or more of their
permit obligations shall notify Ecology in writing. The notification shall
include a summary of the permit obligations that will be carried out by
another entity. The summary shall identify the other entity or entities and shall
be signed by the other entity or entities. During the term of the permit,
Permittees may terminate or amend shared responsibility arrangements by
notifying Ecology, provided this does not alter implementation deadlines.
d. Secondary Permittees required to obtain coverage under this Permit, and the
Phase I Municipal Stormwater Permit or the Eastern Washington Phase II
Municipal Stormwater Permit may obtain coverage by submitting a single
NOI.
S2. AUTHORIZED DISCHARGES
A. This Permit authorizes the discharge of stormwater to surface waters and to ground
waters of the state from MS4s owned or operated by each Permittee covered under
this permit, in the geographic area covered pursuant to S1.A. These discharges are
subject to the following limitations:
1. Discharges to ground waters of the state through facilities regulated under the
Underground Injection Control (UIC) program, chapter 173-218 WAC, are not
authorized under this Permit.
2. Discharges to ground waters not subject to regulation under the federal Clean
Water Act are authorized in this permit only under state authorities, chapter 90.48
RCW, the Water Pollution Control Act.
S2.B.1 S3.A.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 11 of 74
B. This Permit authorizes discharges of non-stormwater flows to surface waters and to
ground waters of the state from MS4s owned or operated by each Permittee covered
under this permit, in the geographic area covered pursuant to S1.A, only under one or
more of the following conditions:
1. The discharge is authorized by a separate NPDES or State Waste Discharge
permit.
2. The discharge is from emergency fire fighting activities.
3. The discharge is from another illicit or non-stormwater discharge that is managed
by the Permittee as provided in Special Condition S5.C.3 or S6.C.3.
These discharges are also subject to the limitations in S2.A.1 and S.2.A.2 above.
C. This Permit does not relieve entities that cause illicit discharges, including spills of oil
or hazardous substances, from responsibilities and liabilities under state and federal
laws and regulations pertaining to those discharges.
D. Discharges from MS4s constructed after the effective date of this permit shall receive
all applicable state and local permits and use authorizations, including compliance
with chapter 43.21C RCW (the State Environmental Policy Act).
E. This Permit does not authorize discharges of stormwater to waters within Indian
Country or to waters subject to water quality standards of Indian Tribes, including
portions of the Puyallup River and other waters on trust or restricted lands within the
1873 Survey Area of the Puyallup Tribe of Indians Reservation, except where
authority has been specifically delegated to Ecology by the U.S. Environmental
Protection Agency. The exclusion of such discharges from this Permit does not waive
any rights the State may have with respect to the regulation of the discharges.
S3. RESPONSIBILITIES OF PERMITTEES
A. Each Permittee covered under this Permit is responsible for compliance with the
terms of this Permit for the regulated small MS4s that they own or operate.
Compliance with (1) or (2) below is required as applicable to each Permittee, whether
the Permittee has applied for coverage as a Permittee, Co-Permittee, or Secondary
Permittee.
1. All city, town and county Permittees are required to comply with all conditions of
this Permit, including any appendices referenced therein, except for Special
Condition S6 Stormwater Management Program for Secondary Permittees.
2. All Secondary Permittees are required to comply with all conditions of this
Permit, including any appendices referenced therein, except for section S5
Stormwater Management Program for Cities, Towns, and Counties and S8.B,
S8.C, and S8.D Monitoring.
S3.B.1 S4.F.1
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 12 of 74
B. Permittees may rely on another entity to satisfy one or more of the requirements of
this Permit. Permittees that are relying on another entity to satisfy one or more of
their permit obligations remain responsible for permit compliance if the other entity
fails to implement permit conditions. Permittees may rely on another entity provided
all the requirements of 40 CFR 122.35(a) are satisfied, including but not limited to:
1. The other entity, in fact, implements the Permit requirements.
2. The other entity agrees to take on responsibility for implementation of the Permit
requirement(s) as indicated on the NOI.
S4. COMPLIANCE WITH STANDARDS
A. In accordance with RCW 90.48.520, the discharge of toxicants to waters of the state
of Washington which would violate any water quality standard, including toxicant
standards, sediment criteria, and dilution zone criteria is prohibited. The required
response to such discharges is defined in section S4.F, below.
B. This Permit does not authorize a discharge which would be a violation of Washington
State Surface Water Quality Standards (chapter 173-201A WAC), Ground Water
Quality Standards (chapter 173-200 WAC), Sediment Management Standards
(chapter 173-204 WAC), or human health-based criteria in the national Toxics Rule
(Federal Register, Vol. 57, NO. 246, Dec. 22, 1992, pages 60848-60923). The
required response to such discharges is defined in section S4.F, below.
C. The Permittee shall reduce the discharge of pollutants to the maximum extent
practicable (MEP).
D. The Permittee shall use all known, available, and reasonable methods of prevention,
control and treatment (AKART) to prevent and control pollution of waters of the state
of Washington.
E. In order to meet the goals of the Clean Water Act, and comply with S4.A, S4.B, S4.C,
and S4.D each Permittee shall comply with all of the applicable requirements of this
Permit as identified in S3. Responsibilities of Permittees.
F. A Permittee remains in compliance with S4 despite any discharges prohibited by
S4.A or S4.B, when the Permittee undertakes the following response toward long-
term water quality improvement:
1. A Permittee shall notify Ecology in writing within 30 days of becoming aware,
based on credible site-specific information that a discharge from the MS4 owned
or operated by the Permittee is causing or contributing to a known or likely
violation of Water Quality Standards in the receiving water. Written notification
provided under this subsection shall, at a minimum, identify the source of the site-
specific information, describe the nature and extent of the known or likely
violation in the receiving water, and explain the reasons why the MS4 discharge is
S4.F.1 S4.F.3
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 13 of 74
believed to be causing or contributing to the problem. For ongoing or continuing
violations, a single written notification to Ecology will fulfill this requirement.
2. In the event that Ecology determines, based on a notification provided under
S4.F.1 or through any other means, that a discharge from an MS4 owned or
operated by the Permittee is causing or contributing to a violation of Water
Quality Standards in a receiving water, Ecology will notify the Permittee in
writing that an adaptive management response outlined in S4.F.3 below is
required, unless:
a. Ecology also determines that the violation of Water Quality Standards is
already being addressed by a Total Maximum Daily Load (TMDL) or other
enforceable water quality cleanup plan; or
b. Ecology concludes the MS4 contribution to the violation will be eliminated
through implementation of other permit requirements.
3. Adaptive Management Response
a. Within 60 days of receiving a notification under S4.F.2, or by an alternative
date established by Ecology, the Permittee shall review its Stormwater
Management Program (SWMP) and submit a report to Ecology. The report
shall include:
i. A description of the operational and/or structural BMPs that are
currently being implemented to prevent or reduce any pollutants that
are causing or contributing to the violation of Water Quality
Standards, including a qualitative assessment of the effectiveness of
each best management practice (BMP).
ii. A description of potential additional operational and/or structural
BMPs that will or may be implemented in order to apply AKART on a
site-specific basis to prevent or reduce any pollutants that are causing
or contributing to the violation of Water Quality Standards.
iii. A description of the potential monitoring or other assessment and
evaluation efforts that will or may be implemented to monitor, assess,
or evaluate the effectiveness of the additional BMPs.
iv. A schedule for implementing the additional BMPs including, as
appropriate: funding, training, purchasing, construction, monitoring,
and other assessment and evaluation components of implementation.
b. Ecology will, in writing, acknowledge receipt of the report within a
reasonable time and notify the Permittee when it expects to complete its
review of the report. Ecology will either approve the additional BMPs and
implementation schedule or require the Permittee to modify the report as
S4.G.1 S4.G.3
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 14 of 74
needed to meet AKART on a site-specific basis. If modifications are required,
Ecology will specify a reasonable time frame in which the Permittee shall
submit and Ecology will review the revised report.
c. The Permittee shall implement the additional BMPs, pursuant to the schedule
approved by Ecology, beginning immediately upon receipt of written
notification of approval.
d. The Permittee shall include with each subsequent annual report a summary of
the status of implementation and the results of any monitoring, assessment or
evaluation efforts conducted during the reporting period. If, based on the
information provided under this subsection, Ecology determines that
modification of the BMPs or implementation schedule is necessary to meet
AKART on a site-specific basis, the Permittee shall make such modifications
as Ecology directs. In the event there are ongoing violations of water quality
standards despite the implementation of the BMP approach of this section, the
Permittee may be subject to compliance schedules to eliminate the violation
under WAC 173-201A-510(4) and WAC 173-226-180 or other enforcement
orders as Ecology deems appropriate during the term of this permit.
e. A TMDL or other enforceable water quality cleanup plan that has been
approved and is being implemented to address the MS4’s contribution to the
Water Quality Standards violation supersedes and terminates the S4.F.3
implementation plan.
f. Provided the Permittee is implementing the approved adaptive management
response under this section, the Permittee remains in compliance with
Condition S4, despite any on-going violations of Water Quality Standards
identified under S4.A or B above.
g. The adaptive management process provided under Section S.4.F is not
intended to create a shield for the Permittee from any liability it may face
under 42 U.S.C. 9601 et seq. or chapter 70.105D RCW.
G. Ecology may modify or revoke and reissue this General Permit in accordance with
G14 General Permit Modification and Revocation, if Ecology becomes aware of
additional control measures, management practices or other actions beyond what is
required in this Permit that are necessary to:
1. Reduce the discharge of pollutants to the MEP,
2. Comply with the state AKART requirements, or
3. Control the discharge of toxicants to waters of the State of Washington.
S5.A.1 S5.A.3
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 15 of 74
S5. STORMWATER MANAGEMENT PROGRAM FOR CITIES, TOWNS, AND
COUNTIES
A. Each Permittee shall develop and implement a Stormwater Management Program
(SWMP). A SWMP is a set of actions and activities comprising the components listed
in S5 and any additional actions necessary, to meet the requirements of applicable
TMDLs pursuant to S7 Compliance with TMDL Requirements, and S8 Monitoring
and Assessment. This section applies to all cities, towns, and counties covered under
this Permit, including cities, towns, and counties that are Co-Permittees. Where the
term “Permittee” is used in this section the requirements apply to all cities, towns, and
counties covered under this Permit.
New Permittees subject to this permit as described in S1.D.1.b shall fully meet the
requirements in S5 as modified in footnotes below, or as specified in an alternate
schedule as a condition of coverage by Ecology. Permittees obtaining coverage after
the issuance date of this permit shall fully meet the requirements in S5 as specified in
an alternate schedule as a condition of coverage by Ecology.
1. At a minimum the Permittee’s SWMP shall be implemented throughout the
geographic area subject to this Permit as described in S1.A.1
2. Each Permittee shall prepare written documentation of the SWMP, called the
SWMP Plan. The SWMP Plan shall be organized according to the program
components in S5.C or a format approved by Ecology, and shall be updated at
least annually for submittal with the Permittee’s annual reports to Ecology (see S9
Reporting and Record Keeping). The SWMP Plan shall be written to inform the
public of the planned SWMP activities for the upcoming calendar year, and shall
include a description of:
a. Planned activities for each of the program components included in S5.C.
b. Any additional planned actions to meet the requirements of applicable
TMDLs pursuant to S7 Compliance with Total Maximum Daily Load
Requirements.
c. Any additional planned actions to meet the requirements of S8 Monitoring.
3. The SWMP shall include an ongoing program for gathering, tracking,
maintaining, and using information to evaluate SWMP development,
implementation and permit compliance and to set priorities.
1 New Permittees shall fully develop and implement the SWMP in accordance with the schedules contained in this
section no later than February 2, 2018.
S5.A.4 S5.A.5
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a. Each Permittee shall track the cost or estimated cost of development and
implementation of each component of the SWMP.2 This information shall be
provided to Ecology upon request.
b. Each Permittee shall track the number of inspections, official enforcement
actions and types of public education activities as required by the respective
program component. This information shall be included in the annual report.
4. Permittees shall continue implementation of existing stormwater management
programs until they begin implementation of the updated stormwater management
program in accordance with the terms of this permit, including implementation
schedules.
5. Coordination among Permittees
a. Coordination among entities covered under municipal stormwater NPDES
permits may be necessary to comply with certain conditions of the SWMP.
The SWMP should include, when needed, coordination mechanisms among
entities covered under a municipal stormwater NPDES permit to encourage
coordinated stormwater-related policies, programs and projects within
adjoining or shared areas, including:
i. Coordination mechanisms clarifying roles and responsibilities for the
control of pollutants between physically interconnected MS4s covered
by a municipal stormwater permit.
ii. Coordinating stormwater management activities for shared water
bodies among Permittees to avoid conflicting plans, policies and
regulations.
b. The SWMP shall include coordination mechanisms among departments within
each jurisdiction to eliminate barriers to compliance with the terms of this
permit. Permittees shall include a written description of internal coordination
mechanisms in the Annual Report due no later than March 31, 2015.
B. The SWMP shall be designed to reduce the discharge of pollutants from regulated
small MS4s to the MEP, meet state AKART requirements, and protect water quality.
C. The SWMP shall include the components listed below. To the extent allowable under
state or federal law, all components are mandatory for city, town or county Permittees
covered under this permit.
2 New Permittees shall begin implementing the requirements of S5.A.3.a no later than August 1, 2015.
S5.C.1 S5.C.1
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1. Public Education and Outreach
The SWMP shall include an education and outreach program designed to reduce
or eliminate behaviors and practices that cause or contribute to adverse
stormwater impacts and encourage the public to participate in stewardship
activities. The education program may be developed and implemented locally or
regionally.
The minimum performance measures are:
a. Each Permittee shall provide an education and outreach program for the area
served by the MS4. The program shall be designed to educate target audiences
about the stormwater problem and provide specific actions they can follow to
minimize the problem.3
i. To build general awareness, Permittees shall select from the following
target audiences and subject areas:
(a) General public (including school age children), and businesses
(including home-based and mobile businesses)
• General impacts of stormwater on surface waters.
• Impacts from impervious surfaces.
• Impacts of illicit discharges and how to report them.
• Low impact development (LID) principles and LID BMPs.
• Opportunities to become involved in stewardship
activities.
(b) Engineers, contractors, developers and land use planners
• Technical standards for stormwater site and erosion
control plans.
• LID principles and LID BMPs.
• Stormwater treatment and flow control BMPs/facilities.
ii. To effect behavior change, Permittees shall select from the following
target audiences and BMPs:
3 New Permittees shall begin implementing the requirements of S5.C.1 no later than August 1, 2015.
S5.C.2 S5.C.2
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(a) General public (which may include school age children),
businesses (including home-based and mobile businesses)
• Use and storage of automotive chemicals, hazardous
cleaning supplies, carwash soaps and other hazardous
materials.
• Equipment maintenance.
• Prevention of illicit discharges.
(b) Residents, landscapers and property managers/owners
• Yard care techniques protective of water quality.
• Use and storage of pesticides and fertilizers and other
household chemicals.
• Carpet cleaning and auto repair and maintenance.
• Vehicle, equipment and home/building maintenance.
• Pet waste management and disposal.
• LID principles and LID BMPs.
• Stormwater facility maintenance.
• Dumpster and trash compactor maintenance.
b. Each Permittee shall create stewardship opportunities and/or partner with
existing organizations to encourage residents to participate in activities such
as stream teams, storm drain marking, volunteer monitoring, riparian plantings
and education activities.
c. Each Permittee shall measure the understanding and adoption of the targeted
behaviors for at least one target audience in at least one subject area. No later
than February 2, 2016, Permittees shall use the resulting measurements to
direct education and outreach resources most effectively, as well as to
evaluate changes in adoption of the targeted behaviors.4 Permittees may meet
this requirement individually or as a member of a regional group.
4 By no later than August 1, 2017, new Permittees shall begin using the results of measurements to direct education
and outreach resources more effectively, as well as to evaluate changes in adopted behaviors.
S5.C.2 S5.C.3
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2. Public Involvement and Participation
Permittees shall provide ongoing opportunities for public involvement and
participation through advisory councils, public hearings, watershed committees,
participation in developing rate-structures or other similar activities. Each
Permittee shall comply with applicable state and local public notice requirements
when developing elements of the SWMP.
The minimum performance measures are:
a. Permittees shall create opportunities for the public to participate in the
decision-making processes involving the development, implementation and
update of the Permittee’s SWMP.5
b. Each Permittee shall post on their website their SWMP Plan and the annual
report required under S9.A no later than May 31 each year. All other
submittals shall be available to the public upon request. To comply with the
posting requirement, a Permittee that does not maintain a website may submit
the updated SWMP in electronic format to Ecology for posting on Ecology’s
website.
3. Illicit Discharge Detection and Elimination
The SWMP shall include an ongoing program designed to prevent, detect,
characterize, trace and eliminate illicit connections and illicit discharges into the
MS4.
The minimum performance measures are:
a. Mapping of the MS4 shall continue on an ongoing basis.6 MS4 maps shall be
periodically updated. Update maps if necessary to meet the requirements of
this section no later than February 2, 2018. At a minimum, maps shall include
the following information:
i. Known MS4 outfalls and known MS4 discharge points.
ii. Receiving waters, other than ground water.
iii. Stormwater treatment and flow control BMPs/facilities owned or
operated by the Permittee.
5 New Permittees shall develop and begin to implement requirements of S5.C.2.a no later than August 1, 2014.
6 New Permittees shall meet the requirements to map the MS4 according to S5.C.3.a no later than February 2, 2018,
except where otherwise noted in this section.
S5.C.3 S5.C.3
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iv. Tributary conveyances to all known outfalls and discharge points with
a 24 inch nominal diameter or larger, or an equivalent cross-sectional
area for non-pipe systems. The following attributes shall be mapped:
• Tributary conveyance type, material, and size where known.
• Associated drainage areas.
• Land use.
v. All connections to the MS4 authorized or allowed by the Permittee
after February 16, 2007.7
vi. Connections between the MS4 owned or operated by the Permittee and
other municipalities or public entities.
vii. Geographic areas served by the Permittee’s MS4 that do not discharge
stormwater to surface waters.
viii. To the extent consistent with national security laws and directives,
each Permittee shall make available to Ecology upon request, MS4
map(s) depicting the information required in S5.C.3.a.i through vi
above. The preferred format for mapping will be an electronic format
with fully described mapping standards. An example description is
available on Ecology website.
ix. Upon request, and to the extent appropriate, Permittees shall provide
mapping information to federally-recognized Indian Tribes,
municipalities, and other Permittees. This permit does not preclude
Permittees from recovering reasonable costs associated with fulfilling
mapping information requests by federally-recognized Indian Tribes,
municipalities, and other Permittees.
b. Each Permittee shall implement an ordinance or other regulatory mechanism
to effectively prohibit non-stormwater, illicit discharges into the Permittee’s
MS4 to the maximum extent allowable under state and federal law.8
i. Allowable Discharges: The regulatory mechanism does not need to
prohibit the following categories of non-stormwater discharges:
• Diverted stream flows
• Rising ground waters
7 New Permittees shall meet the requirements of S5.C.3.a.v. after August 1, 2013 for all connections to the MS4
authorized after August 1, 2013.
8 New Permittees shall meet the requirements of S5.C.3.b no later than February 2, 2016.
S5.C.3 S5.C.3
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• Uncontaminated ground water infiltration (as defined at 40
CFR 35.2005(b)(20))
• Uncontaminated pumped ground water
• Foundation drains
• Air conditioning condensation
• Irrigation water from agricultural sources that is commingled
with urban stormwater
• Springs
• Uncontaminated water from crawl space pumps
• Footing drains
• Flows from riparian habitats and wetlands
• Non-stormwater discharges authorized by another NPDES or
state waste discharge permit
• Discharges from emergency fire fighting activities in
accordance with S2 Authorized Discharges
ii. Conditionally Allowable Discharges: The regulatory mechanism may
allow the following categories of non-stormwater discharges only if
the stated conditions are met:
• Discharges from potable water sources, including but not
limited to water line flushing, hyperchlorinated water line
flushing, fire hydrant system flushing, and pipeline hydrostatic
test water. Planned discharges shall be dechlorinated to a total
residual chlorine concentration of 0.1 ppm or less, pH-adjusted,
if necessary, and volumetrically and velocity controlled to
prevent re-suspension of sediments in the MS4.
• Discharges from lawn watering and other irrigation runoff.
These discharges shall be minimized through, at a minimum,
public education activities (see section S5.C.1) and water
conservation efforts.
• Dechlorinated swimming pool, spa and hot tub discharges. The
discharges shall be dechlorinated to a total residual chlorine
concentration of 0.1 ppm or less, pH-adjusted and
reoxygenized if necessary, volumetrically and velocity
controlled to prevent re-suspension of sediments in the MS4.
S5.C.3 S5.C.3
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Discharges shall be thermally controlled to prevent an increase
in temperature of the receiving water. Swimming pool cleaning
wastewater and filter backwash shall not be discharged to the
MS4.
• Street and sidewalk wash water, water used to control dust, and
routine external building washdown that does not use
detergents. The Permittee shall reduce these discharges
through, at a minimum, public education activities (see section
S5.C.1) and/or water conservation efforts. To avoid washing
pollutants into the MS4, Permittees shall minimize the amount
of street wash and dust control water used.
• Other non-stormwater discharges. The discharges shall be in
compliance with the requirements of a pollution prevention
plan reviewed by the Permittee, which addresses control of
such discharges.
iii. The Permittee shall further address any category of discharges in (i) or
(ii) above if the discharges are identified as significant sources of
pollutants to waters of the State.
iv. The ordinance or other regulatory mechanism shall include escalating
enforcement procedures and actions.
v. The Permittee shall implement a compliance strategy that includes
informal compliance actions such as public education and technical
assistance as well as the enforcement provisions of the ordinance or
other regulatory mechanism. To implement an effective compliance
strategy, the Permittee’s ordinance or other regulatory mechanism may
need to include the following tools:
• The application of operational and/or structural source control
BMPs for pollutant generating sources associated with existing
land uses and activities where necessary to prevent illicit
discharges. The source control BMPs referenced in this subsection
are in Volume IV of the Stormwater Management Manual for
Western Washington, or an equivalent manual approved by
Ecology under the 2013 Phase I Permit.
• The maintenance of stormwater facilities which discharge into the
Permittee’s MS4 in accordance with maintenance standards
established under S5.C.4 and/or S5.C.5 where necessary to prevent
illicit discharges.
S5.C.3 S5.C.3
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vi. The Permittee’s ordinance or other regulatory mechanism in effect as
of the effective date of this permit shall be revised if necessary to meet
the requirements of this section no later than February 2, 2018.
c. Each Permittee shall implement an ongoing program designed to detect and
identify non-stormwater discharges and illicit connections into the Permittee’s
MS4.9 The program shall include the following components:
i. Procedures for conducting investigations of the Permittee’s MS4,
including field screening and methods for identifying potential
sources.
The Permittee shall implement a field screening methodology
appropriate to the characteristics of the MS4 and water quality
concerns. Screening for illicit connections may be conducted using:
Illicit Discharge Detection and Elimination: A Guidance Manual for
Program Development and Technical Assessments, Center for
Watershed Protection, October 2004, or another methodology of
comparable or improved effectiveness. The Permittee shall document
the field screening methodology in the relevant Annual Report.
All Permittees, except for the City of Aberdeen, shall complete field
screening for at least 40% of the MS4 no later than December 31,
2017,10 and on average 12% each year thereafter. The City of
Aberdeen shall complete field screening for at least 40% of the system
no later than June 30, 2018 and on average 12% each year thereafter.
ii. A publicly listed and publicized hotline or other telephone number for
public reporting of spills and other illicit discharges.11
iii. An ongoing training program for all municipal field staff, who, as part
of their normal job responsibilities, might come into contact with or
otherwise observe an illicit discharge and/or illicit connection to the
MS4, on the identification of an illicit discharge and/or connection,
and on the proper procedures for reporting and responding to the illicit
discharge and/or connection. Follow-up training shall be provided as
needed to address changes in procedures, techniques, requirements, or
9 New Permittees shall fully implement the requirements of S5.C.3.c no later than February 2, 2018, except where
otherwise noted in this section.
10 New Permittees shall complete S5.C.3.c.i requirements for field screening covering at least 12% of the MS4
within the Permittee’s coverage area no later than December 31, 2017, and on average 12% each year thereafter.
11 New Permittees shall implement the requirements of S5.C.3.c.ii no later than August 1, 2015.
S5.C.3 S5.C.3
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staffing. Permittees shall document and maintain records of the
trainings provided and the staff trained.12
iv. Permittees shall inform public employees, businesses, and the general
public of hazards associated with illicit discharges and improper
disposal of waste.13
d. Each Permittee shall implement an ongoing program designed to address
illicit discharges, including spills and illicit connections, into the Permittee’s
MS4.14 The program shall include:
i. Procedures for characterizing the nature of, and potential public or
environmental threat posed by, any illicit discharges found by or
reported to the Permittee. Procedures shall address the evaluation of
whether the discharge must be immediately contained and steps to be
taken for containment of the discharge.
ii. Procedures for tracing the source of an illicit discharge; including
visual inspections, and when necessary, opening manholes, using
mobile cameras, collecting and analyzing water samples, and/or other
detailed inspection procedures.
iii. Procedures for eliminating the discharge; including notification of
appropriate authorities; notification of the property owner; technical
assistance; follow-up inspections; and use of the compliance strategy
developed pursuant to S5.C.3.b.v, including escalating enforcement
and legal actions if the discharge is not eliminated.
iv. Compliance with the provisions in (i), (ii), and (iii), above, shall be
achieved by meeting the following timelines:
• Immediately respond to all illicit discharges, including spills,
which are determined to constitute a threat to human health,
welfare, or the environment, consistent with General Condition
G3.
• Investigate (or refer to the appropriate agency with the authority to
act) within 7 days, on average, any complaints, reports or
monitoring information that indicates a potential illicit discharge.
12 New Permittees shall develop and begin implementing the ongoing training program described in S5.C.3.c.iii no
later than February 2, 2016.
13 New Permittees shall inform public employees, businesses, and the general public of hazards associated with
illicit discharges no later than February 2, 2017.
14 New Permittees shall fully develop and implement the requirements of S5.C.3.d no later than February 2, 2018.
S5.C.4 S5.C.4
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• Initiate an investigation within 21 days of any report or discovery
of a suspected illicit connection to determine the source of the
connection, the nature and volume of discharge through the
connection, and the party responsible for the connection.
• Upon confirmation of an illicit connection, use the compliance
strategy in a documented effort to eliminate the illicit connection
within 6 months. All known illicit connections to the MS4 shall be
eliminated.
e. Permittees shall train staff who are responsible for identification,
investigation, termination, cleanup, and reporting of illicit discharges,
including spills, and illicit connections, to conduct these activities. Follow-up
training shall be provided as needed to address changes in procedures,
techniques, requirements or staffing. Permittees shall document and maintain
records of the training provided and the staff trained.15
f. Recordkeeping: Permittees shall track and maintain records of the activities
conducted to meet the requirements of this section.
4. Controlling Runoff from New Development, Redevelopment and
Construction Sites
Each Permittee shall implement and enforce a program to reduce pollutants
in stormwater runoff to a regulated small MS4 from new development,
redevelopment and construction site activities. The program shall apply to
private and public development, including roads.16
The minimum performance measures are:
a. Implement an ordinance or other enforceable mechanism that addresses runoff
from new development, redevelopment, and construction site projects. Except
for Permittees in Lewis and Cowlitz Counties and the City of Aberdeen, the
ordinance or other enforceable mechanism to implement (i) through (iii),
below, shall be adopted and effective no later than December 31, 2016. The
local program adopted to meet the requirements of S5.C.4.a(i) through (iii),
below shall apply to all applications 17 submitted on or after January 1, 2017
and shall apply to applications submitted prior to January 1, 2017, which have
15 New Permittees shall meet the requirements of S5.C.3.e no later than February 2, 2016.
16 New Permittees shall meet the requirements of S5.C.4 no later than December 31, 2017, except where otherwise
specified in this section.
17 In this context, “application” means, at a minimum a complete project description, site plan, and, if applicable,
SEPA checklist. Permittees may establish additional elements of a completed application.
S5.C.4 S5.C.4
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not started construction 18 by January 1, 2022 19.
For Permittees in Lewis and Cowlitz Counties the ordinance or other
enforceable mechanism to implement (i) through (iii), below, shall be
adopted and effective no later than June 30, 2017. The local program adopted to
meet the requirements of S5.C.4.a(i) through (iii), below shall apply to all
applications submitted on or after July 1, 2017 and shall apply to applications
submitted prior to July 1, 2017, which have not started construction by June 30,
2022.
For the City of Aberdeen the ordinance or other enforceable mechanism to
implement (i) through (iii), below, shall be adopted and effective no later than
June 30, 2018. The local program adopted to meet the requirements of
S5.C.4.a(i) through (iii), below shall apply to all applications submitted on or
after July 1, 2018 and shall apply to applications submitted prior to July 1,
2018, which have not started construction by June 30, 2023.
The ordinance or other enforceable mechanism shall include, at a minimum:
i. The Minimum Requirements, thresholds, and definitions in Appendix
1 or a program approved by Ecology under the 2013 NPDES Phase I
Municipal Stormwater Permit, for new development, redevelopment,
and construction sites. Adjustment and variance criteria equivalent to
those in Appendix 1 shall be included. More stringent requirements
may be used, and/or certain requirements may be tailored to local
circumstances through the use of Ecology-approved basin plans or
other similar water quality and quantity planning efforts. Such local
requirements and thresholds shall provide equal protection of receiving
waters and equal levels of pollutant control to those provided in
Appendix 1.
ii. The local requirements shall include the following requirements,
limitations, and criteria that, when used to implement the minimum
requirements in Appendix 1 (or program approved by Ecology under
the 2013 Phase I Permit) will protect water quality, reduce the
18 In this context “started construction” means the site work associated with, and directly related to the approved
project has begun. For example: grading the project site to final grade or utility installation. Simply clearing the
project site does not constitute the start of construction. Permittees may establish additional requirements related to
the start of construction.
19 New Permittees shall meet the requirements of S5.C.4.a no later than December 31, 2017. The local program shall
apply to all applications submitted on or after January 1, 2018 and shall apply to applications submitted prior to
January 1, 2018, which have not started construction by January 1, 2023.
S5.C.4 S5.C.4
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discharge of pollutants to the MEP, and satisfy the State requirement
under chapter 90.48 RCW to apply AKART prior to discharge:
(a) Site planning requirements
(b) BMP selection criteria
(c) BMP design criteria
(d) BMP infeasibility criteria
(e) LID competing needs criteria
(f) BMP limitations
Permittees shall document how the criteria and requirements will
protect water quality, reduce the discharge of pollutants to the MEP,
and satisfy State AKART requirements.
Permittees who choose to use the requirements, limitations, and
criteria above in the Stormwater Management Manual for Western
Washington, or a program approved by Ecology under the 2013 Phase
I Permit, may cite this choice as their sole documentation to meet this
requirement.
iii. The legal authority, through the approval process for new development
and redevelopment, to inspect and enforce maintenance standards for
private stormwater facilities approved under the provisions of this
section that discharge to the Permittee’s MS4.
b. The program shall include a permitting process with site plan review,
inspection and enforcement capability to meet the standards listed in (i)
through (iv) below, for both private and public projects, using qualified
personnel (as defined in Definitions and Acronyms). At a minimum, this
program shall be applied to all sites that meet the minimum thresholds
adopted pursuant to S5.C.4.a.i, above.
i. Review of all stormwater site plans for proposed development
activities.
ii. Inspect, prior to clearing and construction, all permitted development
sites that have a high potential for sediment transport as determined
through plan review based on definitions and requirements in
Appendix 7 Determining Construction Site Sediment Damage
Potential. As an alternative to evaluating each site according to
Appendix 7, Permittees may choose to inspect all construction sites
that meet the minimum thresholds adopted pursuant to S5.C.4.a.i,
above.
S5.C.4 S5.C.4
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iii. Inspect all permitted development sites during construction to verify
proper installation and maintenance of required erosion and sediment
controls. Enforce as necessary based on the inspection.
iv. Inspect all permitted development sites upon completion of
construction and prior to final approval or occupancy to ensure proper
installation of permanent stormwater facilities. Verify that a
maintenance plan is completed and responsibility for maintenance is
assigned for stormwater treatment and flow control BMPs/facilities.
Enforce as necessary based on the inspection.
v. Compliance with the inspection requirements in (ii), (iii) and (iv)
above, shall be determined by the presence and records of an
established inspection program designed to inspect all sites.
Compliance during this permit term shall be determined by achieving
at least 80% of scheduled inspections.
vi. An enforcement strategy shall be implemented to respond to issues of
non-compliance.
c. The program shall include provisions to verify adequate long-term operation
and maintenance (O&M) of stormwater treatment and flow control
BMPs/facilities that are permitted and constructed pursuant to (b) above.
Except for Permittees located in Lewis or Cowlitz Counties and the City of
Aberdeen, these provisions shall be in place no later than December 31, 2016.
20 For Permittees in Lewis and Cowlitz Counties, the provisions shall be in
place no later than June 30, 2017. For the City of Aberdeen, the provisions
shall be in place no later than June 30, 2018. The provisions shall include:
i. Implementation of an ordinance or other enforceable mechanism that
clearly identifies the party responsible for maintenance, requires
inspection of facilities in accordance with the requirements in (ii)
through (iv) below, and establishes enforcement procedures.
ii. Each Permittee shall establish maintenance standards that are as
protective or more protective of facility function than those specified
in Chapter 4 of Volume V of the Stormwater Management Manual for
Western Washington. For facilities which do not have maintenance
standards, the Permittee shall develop a maintenance standard.
The purpose of the maintenance standard is to determine if
maintenance is required. The maintenance standard is not a measure of
the facility’s required condition at all times between inspections.
20 New Permittees shall meet the requirements of S5.C.4.c no later than December 31, 2017.
S5.C.4 S5.C.4
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Exceeding the maintenance standard between the period of inspections
is not a permit violation.
iii. Annual inspections of all stormwater treatment and flow control
BMPs/facilities that discharge to the MS4 and were permitted by the
Permittee according to S5.C.4.b, including those permitted in
accordance with requirements adopted pursuant to the 2007-2012
Ecology municipal stormwater permits, unless there are maintenance
records to justify a different frequency.
Permittees may reduce the inspection frequency based on maintenance
records of double the length of time of the proposed inspection
frequency. In the absence of maintenance records, the Permittee may
substitute written statements to document a specific less frequent
inspection schedule. Written statements shall be based on actual
inspection and maintenance experience and shall be certified in
accordance with G19 Certification and Signature.
iv. Inspections of all permanent stormwater treatment and flow control
BMPs/facilities and catch basins in new residential developments
every six months until 90% of the lots are constructed (or when
construction is stopped and the site is fully stabilized) to identify
maintenance needs and enforce compliance with maintenance
standards as needed.
v. Compliance with the inspection requirements in (iii) and (iv) above
shall be determined by the presence and records of an established
inspection program designed to inspect all sites. Compliance during
this permit term shall be determined by achieving at least 80% of
scheduled inspections.
vi. Unless there are circumstances beyond the Permittee’s control, when
an inspection identifies an exceedance of the maintenance standard,
maintenance shall be performed:
• Within 1 year for typical maintenance of facilities, except
catch basins.
• Within 6 months for catch basins.
• Within 2 years for maintenance that requires capital
construction of less than $25,000.
Circumstances beyond the Permittee’s control include denial or
delay of access by property owners, denial or delay of necessary
permit approvals, and unexpected reallocations of maintenance staff
to perform emergency work. For each exceedance of the required
S5.C.4 S5.C.4
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
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timeframe, the Permittee shall document the circumstances and how
they were beyond their control.
vii. The program shall include a procedure for keeping records of
inspections and enforcement actions by staff, including inspection
reports, warning letters, notices of violations, and other enforcement
records. Records of maintenance inspections and maintenance
activities shall be maintained.
d. The program shall make available as applicable copies of the "Notice of Intent
for Construction Activity" and copies of the "Notice of Intent for Industrial
Activity" to representatives of proposed new development and redevelopment.
Permittees shall continue to enforce local ordinances controlling runoff from
sites that are also covered by stormwater permits issued by Ecology.21
e. Each Permittee shall ensure that all staff whose primary job duties are
implementing the program to control stormwater runoff from new
development, redevelopment, and construction sites, including permitting,
plan review, construction site inspections, and enforcement, are trained to
conduct these activities. Follow-up training shall be provided as needed to
address changes in procedures, techniques or staffing. Permittees shall
document and maintain records of the training provided and the staff trained.22
f. Low impact development code-related requirements.
i. No later than December 31, 2016,23 Permittees shall review, revise and
make effective their local development-related codes, rules, standards,
or other enforceable documents to incorporate and require LID
principles and LID BMPs. For Permittees in Lewis and Cowlitz
Counties, the deadline for this requirement is no later than June 30,
2017; for the City of Aberdeen, the deadline for this requirement is no
later than June 30, 2018.
The intent of the revisions shall be to make LID the preferred and
commonly-used approach to site development. The revisions shall be
designed to minimize impervious surfaces, native vegetation loss, and
stormwater runoff in all types of development situations. Permittees
shall conduct a similar review and revision process, and consider the
range of issues, outlined in the following document: Integrating LID
21 New Permittees shall meet the requirements of S5.C.4.d beginning no later than August 1, 2013.
22 New Permittees shall meet the requirements of S5.C.4.e no later than December 31, 2017.
23 New Permittees shall meet the requirements of S5.C.4.f.i no later than December 31, 2017.
S5.C.4 S5.C.4
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into Local Codes: A Guidebook for Local Governments (Puget Sound
Partnership, 2012).
ii. Except for Permittees in Lewis and Cowlitz Counties and the City of
Aberdeen, each Permittee shall submit a summary of the results of the
review and revision process in (i) above with the annual report due no
later than March 31, 2017 24. Permittees in Lewis and Cowlitz Counties
shall submit the summary with the annual report due no later than
March 31, 2018. The City of Aberdeen shall submit the summary with
the Fifth Year annual report. This summary shall include, at a
minimum, a list of the participants (job title, brief job description, and
department represented), the codes, rules, standards, and other
enforceable documents reviewed, and the revisions made to those
documents which incorporate and require LID principles and LID
BMPs. The summary shall include existing requirements for LID
principles and LID BMPs in development-related codes. The summary
shall be organized as follows:
(a) Measures to minimize impervious surfaces;
(b) Measures to minimize loss of native vegetation; and
(c) Other measures to minimize stormwater runoff.
g. Watershed-scale stormwater planning
The objective of watershed-scale stormwater planning is to identify a
stormwater management strategy or strategies that would result in hydrologic
and water quality conditions that fully support “existing uses,” and
“designated uses,” as those terms are defined in WAC 173-201A-020,
throughout the stream system.
Each City or County Permittee 25 that has all or part of its coverage area in a
watershed selected by a Phase I county for watershed-scale stormwater
planning under condition S5.C.5.c of the Phase I Municipal Stormwater
Permit must fully participate in the watershed-scale stormwater planning
process as described in S5.C.4.g, below. Permittees may choose to participate
in a coordinated scope of work and schedule with one or more of the
Permittees within the selected watershed, or conduct their scope of work
independently.
24 New Permittees shall meet the S5.C.4.f.ii reporting requirement in the annual report covering calendar year 2017
and due no later than March 31, 2018.
25 This section applies to the Phase II Permittees within King County’s selected watershed: the cities of Redmond
and Woodinville. Bothell has minimal acreage in the Snohomish County watershed and is not required to
participate.
S5.C.4 S5.C.4
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
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i. No later than August 13, 2015, each Permittee within a selected
watershed must submit to Ecology documentation of its approach to
coordinate with other Permittees within the watershed, including:
(a) A list of the municipal stormwater Permittees with whom the
Permittee will undertake watershed-scale planning under a
common scope of work; and a description of the coordination
and dispute resolution procedures agreed to by all of the
Permittees operating under the common scope of work; and
(b) A description of planned coordination and dispute resolution
procedures for providing and receiving feedback from
Permittees operating under different scopes of work within the
same watershed, including procedures to:
1) Review, provide comment, and revise methods and
assumptions to meet S5.C.4.g.ii (a) through (d);
2) Review, provide comment, and revise present- and future-
condition B-IBI scores, pollutant concentrations, temperature
and hydrologic metrics used for calibrating the model;
3) Share the results of the modeling performed by the Permittee
with all other Permittees in the watershed;
4) Adjust the Permittee’s proposed changes to development-
related codes, rules, standards, plans, and potential future
structural stormwater control projects in response to feedback
so that the planning objectives, as described in S5.C.4.g
above, are projected to be met throughout the watershed.
(c) It is not a permit violation if other entities, over whose actions
the Permittee has limited or no control, refuse to participate in
the coordination plan described in S5.C.4.g.i.
ii. No later than November 4, 2015 the Permittee must submit a scope of
work and a schedule to Ecology for the complete watershed-scale
stormwater planning process. The scope of work and schedule are
subject to Ecology’s review and approval. If Ecology takes longer than
90 days to provide a written response, the required deadline for
submitting a final watershed-scale stormwater plan to Ecology will be
automatically extended by the number of days Ecology exceeds 90
days, but no later than July 30, 2018.
The scope of work and schedule must apply to the geographic extent
of the jurisdictions of the Permittees listed under S5.C.4.g.i (a) above
and, at a minimum, describe:
S5.C.4 S5.C.4
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(a) An assessment of existing hydrologic, biologic, and water
quality conditions within the selected watershed, and an
assessment of the current status of the aquatic community. This
assessment can be based on existing data where such data are
available. Where such data are not available, or are not
sufficient, the scope of work and schedule must include the
collection of such data.
The existing conditions assessment must, at a minimum, include
the following:
1) Water quality conditions as established through sampling
during base flows and storm flows for, at a minimum, the
following chemical parameters: dissolved copper, dissolved
zinc, temperature, and fecal coliform. Permittees must
identify or collect data from locations upgradient and
downgradient of stream sections influenced by MS4
discharges.
2) Continuous flow monitoring of the stream to provide the data
necessary to calibrate a continuous runoff model to the
selected watershed. Permittees must identify or collect flow
monitoring data from locations upgradient and downgradient
of stream sections influenced by MS4 discharges.
3) Macroinvertebrate data for the purpose of estimating current
Benthic Index of Biotic Integrity (B-IBI) scores and
comparing them with the scores predicted by the existing
values of the hydrologic metrics in S5.C.4.g.ii (d).
4) The status of the aquatic community, including the presence
and distribution of salmonid uses, using data from existing
sources.
(b) Efforts to compile and/or generate maps of the selected
watershed to identify the existing distribution and totals of
general soil types, vegetative land cover, impervious land
covers, and regulated and other MS4s. Maps must be sufficient
to allow construction of a rainfall/runoff model representation of
the watershed. Maps must also identify areas within the
watershed appropriate for special attention in regard to
hydrologic and water quality impacts. For example: headwater
wetlands and critical aquifer recharge areas.
(c) How the Permittee will use the existing conditions assessment
from S5.C.4.g.ii (a) and the maps described in S5.C.4.g.ii (b) to
S5.C.4 S5.C.4
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
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calibrate a continuous runoff model to reflect the existing
hydrologic, water quality, and biologic (as represented by B-IBI
score) conditions.
(d) How the Permittee will use the model calibrated in S5.C.4.g.ii
(c) to estimate hydrologic changes from the historic condition;
and to predict the future hydrologic, biologic, and water quality
conditions at full build-out under existing or proposed
comprehensive land use management plan(s) for the watershed.
Future biologic conditions must be estimated by using a
correlation of hydrologic metrics with B-IBI scores for Puget
Sound Lowland Streams 26, or other similar correlation if
approved by Ecology. Future water quality conditions must be
described through estimation of concentrations of, at a
minimum, dissolved copper, dissolved zinc, temperature, and
fecal coliform.
(e) How, if the estimation in S5.C.4.g.ii (d) predicts water quality
standards will not be met, the Permittee will use the calibrated
watershed model to evaluate stormwater management strategies
to meet the standards. The same hydrologic metrics and
correlated B-IBI scores, and water quality parameters used in
S5.C.4.g.ii (d) must be used to evaluate the effectiveness of
strategies.
1) Stormwater management strategies to be evaluated for all
jurisdictions in the watershed must include:
• Changes to development-related codes, rules, standards,
and plans.
• Potential future structural stormwater control projects.
2) Stormwater management strategies evaluated may also
include:
• Basin-specific stormwater control requirements for new
development and redevelopment as allowed by Section 7
of Appendix 1.
• Strategies to encourage redevelopment and infill, and an
assessment of options for efficient, effective runoff
26 DeGasperi, C.L., Berge, H. B., Whiting, K. R., Burkey, J. J., Cassin, J. L. and Fuerstenberg, R. R. (2009), Linking
Hydrologic Alteration to Biological Impairment in Urbanizing Streams of the Puget Lowland, Washington, USA.
JAWRA Journal of the American Water Resources Association, 45: 512-533. Doi: 10.1111/j.1752-
1688.2009.00306.x
S5.C.5 S5.C.5
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controls for redevelopment projects, such as regional
facilities, in lieu of individual site requirements.
(f) How the permittee will create an implementation plan and
schedule that includes: potential future actions to implement the
identified stormwater management strategies, responsible
parties, estimated costs, and potential funding mechanisms.
(g) A public review and comment process that, at a minimum,
focuses on the draft watershed-scale stormwater plan. The public
review must allow for public comment from all governmental
entities with jurisdiction within the watershed.
iii. The watershed-scale stormwater planning process, as documented in
the scope of work and schedule, may include an evaluation of
strategies to preserve or improve other factors that influence
maintenance of the existing and designated uses of the stream.
Examples include: channel restoration, in-stream culvert replacement,
quality of the riparian zone, gravel disturbance regime, and presence
and distribution of large woody debris.
iv. Each Permittee (or group of Permittees operating under a single scope
of work, as described above) must submit a final watershed-scale
stormwater plan to Ecology no later April 4, 2018. The plan must
summarize results of the modeling and planning process, describe
results of the evaluation of strategies under S5.C.4.g.ii (e), and include
the implementation plan and schedule developed pursuant to
S5.C.4.g.ii (f).
5. Municipal Operations and Maintenance
Each Permittee shall implement an operations and maintenance (O&M) program
that includes a training component and has the ultimate goal of preventing or
reducing pollutant runoff from municipal operations.27
The minimum performance measures are:
a. Each Permittee shall implement maintenance standards that are as protective,
or more protective, of facility function than those specified in Chapter 4 of
Volume V of the Stormwater Management Manual for Western Washington.
For facilities which do not have maintenance standards, the Permittee shall
develop a maintenance standard. Except for Permittees located in Lewis and
27 New Permittees shall develop and implement the requirements of S5.C.5 no later than December 31, 2017 except
where otherwise noted in this section.
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Modified January 16, 2015
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Cowlitz Counties and the City of Aberdeen, no later than December 31, 2016,
Permittees shall update their maintenance standards as necessary to meet the
requirements of this section.28 For Permittees in Lewis and Cowlitz Counties,
this requirement shall apply no later than June 30, 2017; for the City of
Aberdeen this requirement shall apply no later than June 30, 2018.
i. The purpose of the maintenance standard is to determine if
maintenance is required. The maintenance standard is not a measure of
the facility’s required condition at all times between inspections.
Exceeding the maintenance standard between inspections and/or
maintenance is not a permit violation.
ii. Unless there are circumstances beyond the Permittee’s control, when
an inspection identifies an exceedance of the maintenance standard,
maintenance shall be performed:
• Within 1 year for typical maintenance of facilities, except catch
basins.
• Within 6 months for catch basins.
• Within 2 years for maintenance that requires capital
construction of less than $25,000.
Circumstances beyond the Permittee’s control include denial or
delay of access by property owners, denial or delay of necessary
permit approvals, and unexpected reallocations of maintenance staff
to perform emergency work. For each exceedance of the required
timeframe, the Permittee shall document the circumstances and how
they were beyond their control.
b. Annual inspection of all municipally owned or operated permanent
stormwater treatment and flow control BMPs/facilities, and taking appropriate
maintenance actions in accordance with the adopted maintenance standards.29
Permittees may reduce the inspection frequency based on maintenance records
of double the length of time of the proposed inspection frequency. In the
absence of maintenance records, the Permittee may substitute written
statements to document a specific less frequent inspection schedule. Written
28 New Permittees shall adopt the updated maintenance standards in Chapter 4 of Volume V of the Stormwater
Management Manual for Western Washington or an Ecology-approved program under the 2013 Phase I Permit no
later than December 31, 2017.
29 New Permittees shall begin annual inspections of municipally owned or operated stormwater treatment and flow
control facilities/BMPs no later than December 31, 2017.
S5.C.5 S5.C.5
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statements shall be based on actual inspection and maintenance experience
and shall be certified in accordance with G19 Certification and Signature.
c. Spot checks of potentially damaged permanent stormwater treatment and flow
control BMPs/facilities after major storm events (24 hour storm event with a
10 year or greater recurrence interval). If spot checks indicate widespread
damage/maintenance needs, inspect all stormwater treatment and flow control
BMPs/facilities that may be affected. Conduct repairs or take appropriate
maintenance action in accordance with maintenance standards established
above, based on the results of the inspections.
d. Except for the City of Aberdeen, inspection of all catch basins and inlets
owned or operated by the Permittee at least once no later than August 1, 2017
and every two years thereafter. 30 For the City of Aberdeen, the deadline for
this requirement shall be no later than June 30, 2018. Clean catch basins if the
inspection indicates cleaning is needed to comply with maintenance standards
established in the Stormwater Management Manual for Western Washington.
Decant water shall be disposed of in accordance with Appendix 6 Street Waste
Disposal.
The following alternatives to the standard approach of inspecting all catch
basins once no later than August 1, 2017 and every two years thereafter
(except no later than June 30, 2018 and every two years thereafter for the City
of Aberdeen) may be applied to all or portions of the system:
i. The catch basin inspection schedule of every two years may be
changed as appropriate to meet the maintenance standards based on
maintenance records of double the length of time of the proposed
inspection frequency. In the absence of maintenance records for catch
basins, the Permittee may substitute written statements to document a
specific, less frequent inspection schedule. Written statements shall be
based on actual inspection and maintenance experiences and shall be
certified in accordance with G19 Certification and Signature.
ii. Inspections at least once by August 1, 2017 and every two years
thereafter may be conducted on a “circuit basis” whereby 25% of catch
basins and inlets within each circuit are inspected to identify
maintenance needs. Include an inspection of the catch basin
immediately upstream of any system outfall or discharge point, if
applicable. Clean all catch basins within a given circuit for which the
30 New Permittees shall inspect and, if needed, clean all catch basins and inlets owned or operated by the Permittee
in accordance with the requirements of S5.C.5.d once during the permit term, to be completed no later than February
2, 2018.
S5.C.5 S5.C.5
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
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inspection indicates cleaning is needed to comply with maintenance
standards established under S5.C.5.a, above.
iii. The Permittee may clean all pipes, ditches, catch basins, and inlets
within a circuit once during the permit term. Circuits selected for this
alternative must drain to a single point.
e. Compliance with the inspection requirements in b, c, and d above shall be
determined by the presence of an established inspection program designed to
inspect all sites and achieving at least 95% of inspections.
f. Implement practices, policies and procedures to reduce stormwater impacts
associated with runoff from all lands owned or maintained by the Permittee,
and road maintenance activities under the functional control of the Permittee.
Lands owned or maintained by the Permittee include, but are not limited to,
streets, parking lots, roads, highways, buildings, parks, open space, road right-
of-ways, maintenance yards, and stormwater treatment and flow control
BMPs/facilities. The following activities shall be addressed:
• Pipe cleaning
• Cleaning of culverts that convey stormwater in ditch systems
• Ditch maintenance
• Street cleaning
• Road repair and resurfacing, including pavement grinding
• Snow and ice control
• Utility installation
• Pavement striping maintenance
• Maintaining roadside areas, including vegetation management
• Dust control
• Application of fertilizers, pesticides, and herbicides according to the
instructions for their use, including reducing nutrients and pesticides
using alternatives that minimize environmental impacts
• Sediment and erosion control
• Landscape maintenance and vegetation disposal
• Trash and pet waste management
• Building exterior cleaning and maintenance
S6.A.1 S6.A.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
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g. Implement an ongoing training program for employees of the Permittee whose
primary construction, operations or maintenance job functions may impact
stormwater quality. The training program shall address the importance of
protecting water quality, operation and maintenance standards, inspection
procedures, selecting appropriate BMPs, ways to perform their job activities
to prevent or minimize impacts to water quality, and procedures for reporting
water quality concerns. Follow-up training shall be provided as needed to
address changes in procedures, techniques, requirements, or staffing.
Permittees shall document and maintain records of training provided and the
staff trained.
h. Implement a Stormwater Pollution Prevention Plan (SWPPP) for all heavy
equipment maintenance or storage yards, and material storage facilities owned
or operated by the Permittee in areas subject to this Permit that are not
required to have coverage under the General NPDES Permit for Stormwater
Discharges Associated with Industrial Activities or another NPDES permit
that authorizes stormwater discharges associated with the activity. A schedule
for implementation of structural BMPs shall be included in the SWPPP.
Generic SWPPPs that can be applied at multiple sites may be used to comply
with this requirement. The SWPPP shall include periodic visual observation
of discharges from the facility to evaluate the effectiveness of the BMP.
i. Maintain records of inspections and maintenance or repair activities
conducted by the Permittee.
S6. STORMWATER MANAGEMENT PROGRAM FOR SECONDARY PERMITTEES
A. This section applies to all Secondary Permittees and all New Secondary Permittees,
whether coverage under this Permit is obtained individually or as a Co-Permittee with
a city, town, county or another Secondary Permittee.
New Secondary Permittees subject to this Permit shall fully meet the requirements of
this section as modified in footnotes in S6.D below, or as established as a condition of
coverage by Ecology.
1. To the extent allowable under state, federal or local law, all components are
mandatory for each Secondary Permittee covered under this Permit, whether
covered as an individual Permittee or as a Co-Permittee.
2. Each Secondary Permittee shall develop and implement a stormwater
management program (SWMP). A SWMP is a set of actions and activities
comprising the components listed in S6 and any additional actions necessary to
meet the requirements of applicable TMDLs pursuant to S7 Compliance with
TMDL Requirements, and S8 Monitoring and Assessment. The SWMP shall be
designed to reduce the discharge of pollutants from regulated small MS4s to the
MEP and protect water quality.
S6.A.3 S6.D.1
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3. Unless an alternate implementation schedule is established by Ecology as a
condition of permit coverage, the SWMP shall be developed and implemented in
accordance with the schedules contained in this section and shall be fully
developed and implemented no later than four and one-half years from the initial
permit coverage date. Secondary Permittees that are already implementing some
or all of the required SWMP components shall continue implementation of those
components.
4. Secondary Permittees may implement parts of their SWMP in accordance with
the schedule for cities, towns, and counties in S5, provided they have signed a
memorandum of understanding or other agreement to jointly implement the
activity or activities with one or more jurisdictions listed in S1.D.2.a or S1.D.2.b,
and submitted a copy of the agreement to Ecology.
5. Each Secondary Permittee shall prepare written documentation of the SWMP,
called the SWMP Plan. The SWMP Plan shall include a description of program
activities for the upcoming calendar year.
B. Coordination
Secondary Permittees shall coordinate stormwater-related policies, programs and
projects within a watershed and interconnected MS4s. Where relevant and
appropriate, the SWMP shall coordinate among departments of the Secondary
Permittee to ensure compliance with the terms of this Permit.
C. Legal Authority
To the extent allowable under state law and federal law, each Secondary Permittee
shall be able to demonstrate that they can operate pursuant to legal authority which
authorizes or enables the Secondary Permittee to control discharges to and from
MS4s owned or operated by the Secondary Permittee.
This legal authority may be a combination of statutes, ordinances, permits, contracts,
orders, interagency agreements, or similar instruments.
D. Stormwater Management Program for Secondary Permittees
The SWMP for Secondary Permittees shall include the following components:
1. Public Education and Outreach
Each Secondary Permittee shall implement the following stormwater education
strategies:
a. Storm drain inlets owned or operated by the Secondary Permittee that are
located in maintenance yards, in parking lots, along sidewalks, and at
S6.D.2 S6.D.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
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pedestrian access points shall be clearly labeled with a message similar to
“Dump no waste – Drains to water body”.31
As identified during visual inspection and regular maintenance of storm drain
inlets per the requirements of S6.D.3.d and S6.D.6.a.i below, or as otherwise
reported to the Secondary Permittee, any inlet having a label that is no longer
clearly visible and/or easily readable shall be re-labeled within 90 days.
b. Each year beginning no later than three years from the initial date of permit
coverage, public ports, colleges, and universities shall distribute educational
information to tenants and residents on the impact of stormwater discharges
on receiving waters, and steps that can be taken to reduce pollutants in
stormwater runoff. Distribution may be by hard copy or electronic means.
Appropriate topics may include:
i. How stormwater runoff affects local water bodies.
ii. Proper use and application of pesticides and fertilizers.
iii. Benefits of using well-adapted vegetation.
iv. Alternative equipment washing practices, including cars and trucks,
that minimize pollutants in stormwater.
v. Benefits of proper vehicle maintenance and alternative transportation
choices; proper handling and disposal of vehicle wastes, including the
location of hazardous waste collection facilities in the area.
vi. Hazards associated with illicit connections and illicit discharges.
vii. Benefits of litter control of pet waste.
2. Public Involvement and Participation
Each year, no later than May 31, each Secondary Permittee shall:
a. Make the annual report available on the Permittee’s website.
b. Make available on the Permittee’s website the latest updated version of the
SWMP Plan.
c. A Secondary Permittee that does not maintain a website may submit the
updated SWMP Plan and annual report in electronic format to Ecology for
posting on Ecology’s website.
31 New Secondary Permittees shall label all inlets as described in S6.D.1.a no later than four years from the initial
date of permit coverage.
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3. Illicit Discharge Detection and Elimination
Each Secondary Permittee shall:
a. From the initial date of permit coverage, comply with all relevant ordinances,
rules, and regulations of the local jurisdiction(s) in which the Secondary
Permittee is located that govern non-stormwater discharges.
b. Implement appropriate policies prohibiting illicit discharges,32 and an
enforcement plan to ensure compliance with illicit discharge policies.33 These
policies shall address, at a minimum: illicit connections, non-stormwater
discharges, including spills of hazardous materials, and improper disposal of
pet waste and litter.
i. Allowable discharges: The policies do not need to prohibit the
following categories of non-stormwater discharges:
• Diverted stream flows
• Rising ground waters
• Uncontaminated ground water infiltration (as defined at 40
CFR 35.2005(b)(20))
• Uncontaminated pumped ground water
• Foundation drains.
• Air conditioning condensation
• Irrigation water from agricultural sources that is commingled
with urban stormwater
• Springs
• Uncontaminated water from crawl space pumps
• Footing drains
• Flows from riparian habitats and wetlands
32 New Secondary Permittees shall develop and implement appropriate policies prohibiting illicit discharges, and
identify possible enforcement mechanisms as described in S6.D.3.b no later than one year from the initial date of
permit coverage.
33 New Secondary Permittees shall develop and implement an enforcement plan as described in S6.D.3.b no later
than 18 months from the initial date of permit coverage.
S6.D.3 S6.D.3
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
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• Discharges from emergency fire fighting activities in
accordance with S2 Authorized Discharges
• Non-stormwater discharges authorized by another NPDES or
state waste discharge permit
ii. Conditionally allowable discharges: The policies may allow the
following categories of non-stormwater discharges only if the stated
conditions are met and such discharges are allowed by local codes:
• Discharges from potable water sources, including but not
limited to water line flushing, hyperchlorinated water line
flushing, fire hydrant system flushing, and pipeline hydrostatic
test water. Planned discharges shall be dechlorinated to a total
residual chlorine concentration of 0.1 ppm or less, pH-adjusted
if necessary, and volumetrically and velocity controlled to
prevent resuspension of sediments in the MS4.
• Discharges from lawn watering and other irrigation runoff.
These discharges shall be minimized through, at a minimum,
public education activities and water conservation efforts
conducted by the Secondary Permittee and/or the local
jurisdiction.
• Dechlorinated swimming pool, spa and hot tub discharges. The
discharges shall be dechlorinated to a total residual chlorine
concentration of 0.1 ppm or less, pH-adjusted and
reoxygenated if necessary, and volumetrically and velocity
controlled to prevent resuspension of sediments in the MS4.
Discharges shall be thermally controlled to prevent an increase
in temperature of the receiving water. Swimming pool cleaning
wastewater and filter backwash shall not be discharged to the
MS4.
• Street and sidewalk wash water, water used to control dust, and
routine external building washdown that does not use
detergents. The Secondary Permittee shall reduce these
discharges through, at a minimum, public education activities
and/or water conservation efforts conducted by the Secondary
Permittee and/or the local jurisdiction. To avoid washing
pollutants into the MS4, the Secondary Permittee shall
minimize the amount of street wash and dust control water
used.
S6.D.4 S6.D.4
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
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• Other non-stormwater discharges shall be in compliance with
the requirements of a pollution prevention plan reviewed by the
Permittee which addresses control of such discharges.
iii. The Secondary Permittee shall address any category of discharges in
(i) or (ii) above if the discharge is identified as a significant source of
pollutants to waters of the State.
c. Maintain a storm sewer system map showing the locations of all known MS4
outfalls and discharge points, labeling the receiving waters (other than ground
water) and delineating the areas contributing runoff to each outfall and
discharge point. Make the map (or completed portions of the map) available
on request to Ecology and to the extent appropriate, to other Permittees. The
preferred format for mapping is an electronic format with fully described
mapping standards. An example description is provided on Ecology’s
website.34
d. Conduct field inspections and visually inspect for illicit discharges at all
known MS4 outfalls and discharge points. Visually inspect at least one third
(on average) of all known outfalls and discharge points each year beginning
no later than two years from the initial date of permit coverage. Implement
procedures to identify and remove any illicit discharges. Keep records of
inspections and follow-up activities.
e. Implement a spill response plan that includes coordination with a qualified
spill responder.35
f. No later than two years from initial date of permit coverage, provide staff
training or coordinate with existing training efforts to educate staff on proper
BMPs for preventing illicit discharges, including spills. Train all Secondary
Permittee staff who, as part of their normal job responsibilities, have a role in
preventing such illicit discharges.
4. Construction Site Stormwater Runoff Control
From the initial date of permit coverage, each Secondary Permittee shall:
a. Comply with all relevant ordinances, rules, and regulations of the local
jurisdiction(s) in which the Secondary Permittee is located that govern
construction phase stormwater pollution prevention measures.
34 New Secondary Permittees shall meet the requirements of S6.D.3.c no later than four and one-half years from the
initial date of permit coverage.
35 New Secondary Permittees shall develop and implement a spill response plan as described in S6.D.3.e no later
than four and one-half years from the initial date of permit coverage.
S6.D.5 S6.D.6
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
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Page 45 of 74
b. Ensure that all construction projects under the functional control of the
Secondary Permittee which require a construction stormwater permit obtain
coverage under the NPDES General Permit for Stormwater Discharges
Associated with Construction Activities or an individual NPDES permit prior
to discharging construction related stormwater.
c. Coordinate with the local jurisdiction regarding projects owned or operated by
other entities which discharge into the Secondary Permittee’s MS4, to assist
the local jurisdiction with achieving compliance with all relevant ordinances,
rules, and regulations of the local jurisdiction(s).
d. Provide training or coordinate with existing training efforts to educate relevant
staff in erosion and sediment control BMPs and requirements, or hire trained
contractors to perform the work.
e. Coordinate as requested with Ecology or the local jurisdiction to provide
access for inspection of construction sites or other land disturbances which are
under the functional control of the Secondary Permittee during land disturbing
activities and/or construction period.
5. Post-Construction Stormwater Management for New Development and
Redevelopment
From the initial date of permit coverage, each Secondary Permittee shall:
a. Comply with all relevant ordinances, rules and regulations of the local
jurisdiction(s) in which the Secondary Permittee is located that govern post-
construction stormwater pollution prevention measures.
b. Coordinate with the local jurisdiction regarding projects owned or operated by
other entities which discharge into the Secondary Permittee’s MS4, to assist
the local jurisdiction with achieving compliance with all relevant ordinances,
rules and regulations of the local jurisdiction(s).
6. Pollution Prevention and Good Housekeeping for Municipal Operations
Each Secondary Permittee shall:
a. Implement a municipal operation and maintenance (O&M) plan to minimize
stormwater pollution from activities conducted by the Secondary Permittee.
The O&M Plan shall include appropriate pollution prevention and good
housekeeping procedures for all of the following operations, activities, and/or
S6.D.6 S6.D.6
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 46 of 74
types of facilities that are present within the Secondary Permittee’s boundaries
and under the functional control of the Secondary Permittee.36
i. Stormwater collection and conveyance systems, including catch
basins, stormwater pipes, open channels, culverts, and stormwater
treatment and flow control BMPs/facilities. The O&M Plan shall
address, at a minimum: scheduled inspections and maintenance
activities, including cleaning and proper disposal of waste removed
from the system. Secondary Permittees shall properly maintain
stormwater collection and conveyance systems owned or operated by
the Secondary Permittee and regularly inspect and maintain all
stormwater facilities to ensure facility function.
Secondary Permittees shall establish maintenance standards that are as
protective or more protective of facility function than those specified
in Chapter 4 Volume V of the Stormwater Management Manual for
Western Washington. Secondary Permittees shall review their
maintenance standards to ensure they are consistent with the
requirements of this section.
Secondary Permittees shall conduct spot checks of potentially
damaged permanent stormwater treatment and flow control
BMPs/facilities following major storm events (24 hour storm event
with a 10 year or greater recurrence interval).
ii. Roads, highways, and parking lots. The O&M Plan shall address,
but is not limited to: deicing, anti-icing, and snow removal practices;
snow disposal areas; material (e.g., salt, sand, or other chemical)
storage areas; all-season BMPs to reduce road and parking lot debris
and other pollutants from entering the MS4.
iii. Vehicle fleets. The O&M Plan shall address, but is not limited to:
storage, washing, and maintenance of Secondary Permittee vehicle
fleets; and fueling facilities. Secondary Permittees shall conduct all
vehicle and equipment washing and maintenance in a self-contained
covered building or in designated wash and/or maintenance areas.
iv. External building maintenance. The O&M Plan shall address,
building exterior cleaning and maintenance including cleaning,
washing, painting; and maintenance and management of dumpsters;
and other maintenance activities.
36 New Secondary Permittees shall develop and implement the operation and maintenance plan described in
S6.D.6.a no later than three years from initial date of permit coverage.
S6.D.6 S6.D.6
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 47 of 74
v. Parks and open space. The O&M Plan shall address, but is not
limited to: proper application of fertilizer, pesticides, and herbicides;
sediment and erosion control; BMPs for landscape maintenance and
vegetation disposal; and trash and pet waste management.
vi. Material storage facilities and heavy equipment maintenance or
storage yards. Secondary Permittees shall develop and implement a
Stormwater Pollution Prevention Plan to protect water quality at each
of these facilities owned or operated by the Secondary Permittee and
not covered under the General NPDES Permit for Stormwater
Discharges Associated with Industrial Activities or under another
NPDES permit that authorizes stormwater discharges associated with
the activity.
vii. Other facilities that would reasonably be expected to discharge
contaminated runoff. The O&M Plan shall address proper
stormwater pollution prevention practices for each facility.
b. From the initial date of permit coverage, Secondary Permittees shall also have
permit coverage for all facilities operated by the Secondary Permittee that are
required to be covered under the General NPDES Permit for Stormwater
Discharges Associated with Industrial Activities or another NPDES permit
that authorizes discharges associated with the activity.
c. The O&M Plan shall include sufficient documentation and records as
necessary to demonstrate compliance with the O&M Plan requirements in
S6.D.6.a.(i) through (vii) above.
d. No later than three years from the initial date of permit coverage, Secondary
Permittees shall implement a program designed to train all employees whose
primary construction, operations, or maintenance job functions may impact
stormwater quality. The training shall address:
i. The importance of protecting water quality.
ii. The requirements of this Permit.
iii. Operation and maintenance requirements.
iv. Inspection procedures.
v. Ways to perform their job activities to prevent or minimize impacts to
water quality.
vi. Procedures for reporting water quality concerns, including potential
illicit discharges (including spills).
S6.D.6 S6.D.6
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 48 of 74
S7. COMPLIANCE WITH TOTAL MAXIMUM DAILY LOAD REQUIREMENTS
The following requirements apply if an applicable TMDL is approved for stormwater
discharges from MS4s owned or operated by the Permittee. Applicable TMDLs are TMDLs
which have been approved by EPA on or before the issuance date of this Permit or prior to
the date that Ecology issues coverage under this permit, whichever is later.
A. For applicable TMDLs listed in Appendix 2, affected Permittees shall comply with
the specific requirements identified in Appendix 2. Each Permittee shall keep records
of all actions required by this Permit that are relevant to applicable TMDLs within
their jurisdiction. The status of the TMDL implementation shall be included as part of
the annual report submitted to Ecology. Each annual report shall include a summary
of relevant SWMP and Appendix 2 activities conducted in the TMDL area to address
the applicable TMDL parameter(s).
B. For applicable TMDLs not listed in Appendix 2, compliance with this Permit shall
constitute compliance with those TMDLs.
C. For TMDLs that are approved by EPA after this Permit is issued, Ecology may
establish TMDL related permit requirements through future permit modification if
Ecology determines implementation of actions, monitoring or reporting necessary to
demonstrate reasonable further progress toward achieving TMDL waste load
allocations, and other targets, are not occurring and shall be implemented during the
term of this Permit or when this Permit is reissued. Permittees are encouraged to
participate in development of TMDLs within their jurisdiction and to begin
implementation.
S8. MONITORING AND ASSESSMENT
A. All Permittees including Secondary Permittees shall provide, in each annual report, a
description of any stormwater monitoring or stormwater-related studies conducted by
the Permittee during the reporting period. If other stormwater monitoring or
stormwater-related studies were conducted on behalf of the Permittee during the
reporting period, or if stormwater-related investigations conducted by other entities
were reported to the Permittee during the reporting period, a brief description of the
type of information gathered or received shall be included in the annual report.
Permittees are not required to provide descriptions of any monitoring, studies, or
analyses conducted as part of the Regional Stormwater Monitoring Program (RSMP)
in annual reports. If a Permittee conducts independent monitoring in accordance with
requirements in S8.B or S8.C below, annual reporting of such monitoring must follow
the requirements specified in those sections.
B. Status and trends monitoring. By December 1, 2013, each city and county Permittee
listed in S1.D.2.a(i) and S1.D.2.a(ii) located in Clallam, Island, King, Kitsap, Pierce,
Skagit, Snohomish, Thurston, or Whatcom County shall notify Ecology in writing
which of the following two options for status and trends monitoring the Permittee
S8.B.1 S8.B.1
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 49 of 74
chooses to carry out during this permit cycle. Either option will fully satisfy the
Permittee’s obligations under this section (S8.B). Each Permittee shall select a single
option for the duration of this permit term.
1. Status and Trends Monitoring Option #1: Each Permittee that chooses this
option shall pay into a collective fund to implement RSMP small streams and
marine nearshore status and trends monitoring in Puget Sound. The payments into
the collective fund are due to Ecology annually beginning August 15, 2014. The
payment amounts are (Permittees are listed alphabetically, by county):
Permittee
Annual
payment
amount
Permittee
Annual
payment
amount
Clallam Co. N/A Pierce Co. N/A
Port Angeles $4,732 Bonney Lake $4,075
Island Co. N/A Buckley $1,129
Oak Harbor $5,719 DuPont $1,936
King Co. N/A Edgewood $2,350
Algona $678 Fife $2,005
Auburn $16,914 Fircrest $1,549
Bellevue $30,009 Gig Harbor $1,836
Black Diamond $1,023 Lakewood $14,367
Bothell $8,163 Milton $1,597
Burien $11,238 Orting $1,525
Clyde Hill $695 Puyallup $9,498
Covington $4,307 Steilacoom $1,538
Des Moines $7,152 Sumner $2,217
Duvall $1,463 University Place $7,704
Enumclaw $2,806 Skagit Co. $1,257
Federal Way $21,673 Burlington $2,194
Issaquah $6,632 Anacortes $4,102
Kenmore $5,042 Mount Vernon $7,574
Kent $27,441 Sedro Woolley $2,452
Kirkland $12,116 Snohomish Co. N/A
Lake Forest Park $3,135 Arlington $4,219
Maple Valley $5,648 Brier $1,585
S8.B.2 S8.B.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 50 of 74
Medina $728 Edmonds $9,987
Mercer Island $5,589 Everett $25,419
Newcastle $2,431 Granite Falls $824
Normandy Park $1,597 Lake Stevens $6,512
Pacific $1,540 Lynnwood $8,829
Redmond $13,143 Marysville $14,172
Renton $21,055 Mill Creek $4,566
Sammamish $10,028 Monroe $4,073
SeaTac $6,322 Mountlake Terrace $5,118
Shoreline $13,327 Mukilteo $4,920
Tukwila $4,444 Snohomish $2,276
Woodinville $2,771 Thurston Co. $12,841
Kitsap Co. $17,133 Lacey $9,799
Bainbridge Island $5,709 Olympia $11,110
Bremerton $8,837 Tumwater $4,095
Port Orchard $2,664 Whatcom Co. $3,714
Poulsbo $2,187 Bellingham $18,936
Ferndale $2,737
Or
2. Status and Trends Monitoring Option #2: Each Permittee that chooses this
option shall conduct status and trends monitoring as follows:
a. Beginning no later than October 31, 2014, conduct wadeable stream water
quality, benthos, habitat, and sediment chemistry monitoring according to the
Ecology-approved Quality Assurance Project Plan (QAPP) for RSMP Small
Streams Status and Trends Monitoring.
i. Permittees with population less than 10,000 in the permit coverage
area shall conduct this monitoring at the first two qualified monitoring
locations (as listed sequentially among the potential monitoring
locations defined in the RSMP QAPP) that are located within the
jurisdiction’s boundaries. Counties shall monitor the first location
inside UGA boundaries and the first location outside UGA boundaries.
ii. Permittees with population equal to or greater than 10,000 and fewer
than 50,000 in the permit coverage area shall conduct this monitoring
at the first four qualified monitoring locations (as listed sequentially
among the potential monitoring locations defined in the RSMP QAPP)
S8.B.2 S8.B.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 51 of 74
that are located within the jurisdiction’s boundaries. Counties shall
monitor the first two locations inside UGA boundaries and the first
two locations outside UGA boundaries.
iii. Permittees with population equal to or greater than 50,000 in the
permit coverage area shall conduct this monitoring at the first eight
qualified monitoring locations (as listed sequentially among the
potential monitoring locations defined in the RSMP QAPP) that are
located within the jurisdiction’s boundaries. Counties shall monitor the
first four locations inside UGA boundaries and the first four locations
outside UGA boundaries.
Permittees with population equal to or greater than 50,000 in the
permit coverage area and located entirely inland (i.e., having no Puget
Sound shoreline boundary) shall conduct this monitoring at an
additional four monitoring locations (as listed sequentially among the
potential monitoring locations defined in the RSMP QAPP), for a total
of 12 monitoring locations.
If fewer than the total required number (8 or 12) of monitoring
locations located in the Permittees’ coverage area meet the criteria for
sampling defined in the RSMP QAPP, then the Permittee shall conduct
this monitoring at all of the monitoring locations that meet the criteria.
And
b. Beginning no later than October 1, 2015, Permittees with Puget Sound
shoreline shall conduct sediment chemistry, mussel, and bacteria monitoring
according to the Ecology-approved QAPPs for RSMP Marine Nearshore
Status and Trends Monitoring.
i. Permittees with population less than 10,000 shall conduct this
monitoring at the first two qualified monitoring locations each, for
sediment and for mussels and bacteria (as listed sequentially among
the potential monitoring locations defined in the RSMP QAPPs), that
are located adjacent to the jurisdiction’s Puget Sound shoreline
boundary.
ii. Permittees with population equal to or greater than 10,000 and fewer
than 50,000 in the permit coverage area shall conduct this monitoring
at the first four qualified monitoring locations each, for sediment and
for mussels and bacteria (as listed sequentially among the potential
monitoring locations defined in the RSMP QAPPs), that are located
adjacent to the jurisdiction’s Puget Sound shoreline boundary.
S8.C.1 S8.C.1
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 52 of 74
iii. Permittees with population equal to or greater than 50,000 in the
permit coverage area shall conduct this monitoring at the first six
qualified monitoring locations each, for sediment and for mussels and
bacteria (as listed sequentially among the potential monitoring
locations defined in the RSMP QAPPs), that are located adjacent to the
jurisdiction’s Puget Sound shoreline boundary.
And
c. Data and analyses shall be reported annually in accordance with the Ecology-
approved QAPPs.
C. Stormwater management program effectiveness studies. By December 1, 2013, each
city and county Permittee listed in S1.D.2.a(i) and S1.D.2.a(ii) shall notify Ecology in
writing which of the following two options for effectiveness studies the Permittee
chooses to carry out during this permit cycle. Either option will fully satisfy the
Permittee’s obligations under this section (S8.C). Each Permittee shall select a single
option for the duration of this permit term.
1. Effectiveness Studies Option #1: Each Permittee that chooses this option shall
pay into a collective fund to implement RSMP effectiveness studies. The
payments into the collective fund are due to Ecology annually beginning August
15, 2014. The payment amounts are (Permittees are listed alphabetically, by
county):
Permittee
Annual
payment
amount
Permittee
Annual
payment
amount
Clallam Co. N/A Lewis Co. N/A
Port Angeles $7,885 Centralia $6,334
Clark Co. N/A Pierce Co. N/A
Battle Ground $7,079 Bonney Lake $6,790
Camas $7,002 Buckley $1,882
Vancouver $67,335 DuPont $3,226
Washougal $5,716 Edgewood $3,916
Cowlitz Co. $1,384 Fife $3,340
Kelso $4,793 Fircrest $2,581
Longview $14,687 Gig Harbor $3,059
Grays Harbor Co. N/A Lakewood $23,938
Aberdeen $6,693 Milton $2,661
S8.C.1 S8.C.1
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 53 of 74
Island Co. N/A Orting $2,541
Oak Harbor $9,528 Puyallup $15,826
King Co. N/A Steilacoom $2,563
Algona $1,129 Sumner $3,694
Auburn $28,182 University Place $12,836
Bellevue $50,001 Skagit Co. $2,094
Black Diamond $1,705 Burlington $3,655
Bothell $13,601 Anacortes $6,835
Burien $18,724 Mount Vernon $12,620
Clyde Hill $1,157 Sedro Woolley $4,085
Covington $7,177 Snohomish Co. N/A
Des Moines $11,916 Arlington $7,030
Duvall $2,437 Brier $2,640
Enumclaw $4,675 Edmonds $16,640
Federal Way $36,111 Everett $42,352
Issaquah $11,050 Granite Falls $1,373
Kenmore $8,401 Lake Stevens $10,850
Kent $45,721 Lynnwood $14,711
Kirkland $20,187 Marysville $23,613
Lake Forest Park $5,224 Mill Creek $7,608
Maple Valley $9,410 Monroe $6,786
Medina $1,212 Mountlake Terrace $8,527
Mercer Island $9,313 Mukilteo $8,198
Newcastle $4,050 Snohomish $3,792
Normandy Park $2,661 Thurston Co. $21,395
Pacific $2,565 Lacey $16,326
Redmond $21,899 Olympia $18,511
Renton $35,082 Tumwater $6,823
Sammamish $16,709 Whatcom Co. $6,188
SeaTac $10,533 Bellingham $31,550
Shoreline $22,205 Ferndale $4,561
Tukwila $7,405
S8.C.2 S8.C.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 54 of 74
Woodinville $4,618
Kitsap Co. $28,547
Bainbridge Island $9,512
Bremerton $14,724
Port Orchard $4,439
Poulsbo $3,643
Or
2. Effectiveness Studies Option #2: Each Permittee that chooses this option shall
conduct stormwater discharge monitoring in accordance with Appendix 9 and the
following:
a. By February 2, 2014, each Permittee shall submit to Ecology a draft
stormwater discharge monitoring QAPP for review and approval. If Ecology
does not request changes within 90 days, the draft QAPP is considered
approved. Final QAPPs shall be submitted to Ecology as soon as possible
following finalization.
i. Each Permittee with population fewer than 10,000 in the permit
coverage area shall conduct stormwater discharge monitoring at one
discharge monitoring location.
ii. Each Permittee with population equal to or greater than 10,000 but
fewer than 50,000 in the permit coverage area shall conduct
stormwater discharge monitoring at two discharge monitoring
locations.
iii. Each Permittee with population equal to or greater than 50,000 but
fewer than 100,000 in the permit coverage area shall conduct
stormwater discharge monitoring at three discharge monitoring
locations.
iv. Each Permittee with population 100,000 or more in the permit
coverage area shall conduct stormwater discharge monitoring at four
discharge monitoring locations.
b. Permittees shall document in the QAPP why selected discharge monitoring
locations are of interest for long term stormwater discharge monitoring and
associated stormwater management program effectiveness evaluations.
Permittees are encouraged to monitor at locations chosen and submitted in the
annual reports that were due March 31, 2011.
c. Flow monitoring at discharge monitoring locations shall be implemented
beginning no later than October 1, 2014. Stormwater discharge monitoring
S8.C.2 S8.C.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 55 of 74
shall be fully implemented no later than October 1, 2015. All monitoring shall
be conducted in accordance with an Ecology-approved QAPP.
D. Source identification and diagnostic monitoring. Each city and county Permittee
listed in S1.D.2.a(i) and S1.D.2.a(ii) shall pay into a collective fund to implement the
RSMP Source Identification Information Repository (SIDIR). The payments into the
collective fund are due to Ecology annually beginning August 15, 2014. The payment
amounts are (Permittees are listed alphabetically, by county):
Permittee
Annual
payment
amount
Permittee
Annual
payment
amount
Clallam Co. N/A Lewis Co. N/A
Port Angeles $731 Centralia $587
Clark Co. N/A Pierce Co. N/A
Battle Ground $657 Bonney Lake $630
Camas $649 Buckley $175
Vancouver $6,245 DuPont $299
Washougal $530 Edgewood $363
Cowlitz Co. $128 Fife $310
Kelso $444 Fircrest $239
Longview $1,362 Gig Harbor $284
Grays Harbor Co. N/A Lakewood $2,220
Aberdeen $621 Milton $247
Island Co. N/A Orting $236
Oak Harbor $884 Puyallup $1,468
King Co. N/A Steilacoom $238
Algona $105 Sumner $343
Auburn $2,614 University Place $1,190
Bellevue $4,637 Skagit Co. $194
Black Diamond $158 Burlington $339
Bothell $1,261 Anacortes $634
Burien $1,736 Mount Vernon $1,170
Clyde Hill $107 Sedro Woolley $379
Covington $666 Snohomish Co. N/A
S8.C.2 S8.C.2
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 56 of 74
Des Moines $1,105 Arlington $652
Duvall $226 Brier $245
Enumclaw $434 Edmonds $1,543
Federal Way $3,349 Everett $3,928
Issaquah $1,025 Granite Falls $127
Kenmore $779 Lake Stevens $1,006
Kent $4,240 Lynnwood $1,364
Kirkland $1,872 Marysville $2,190
Lake Forest Park $484 Mill Creek $706
Maple Valley $873 Monroe $629
Medina $112 Mountlake Terrace $791
Mercer Island $864 Mukilteo $760
Newcastle $376 Snohomish $352
Normandy Park $247 Thurston Co. $1,984
Pacific $238 Lacey $1,514
Redmond $2,031 Olympia $1,717
Renton $3,253 Tumwater $633
Sammamish $1,550 Whatcom Co. $574
SeaTac $977 Bellingham $2,926
Shoreline $2,059 Ferndale $423
Tukwila $687
Woodinville $428
Kitsap Co. $2,647
Bainbridge Island $882
Bremerton $1,365
Port Orchard $412
Poulsbo $338
S9. REPORTING REQUIREMENTS
A. No later than March 31 of each year beginning in 2015, each Permittee shall submit
an annual report. The reporting period for the first annual report will be from January
S9.C.1 S9.D.6
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 57 of 74
1, 2014 through December 31, 2014. The reporting period for all subsequent annual
reports will be the previous calendar year unless otherwise specified.
Permittees must submit annual reports electronically using Ecology’s Water Quality
Permitting Portal (WQWebPortal) available on Ecology’s website at:
http://www.ecy.wa.gov/programs/wq/permits/paris/portal.html unless otherwise
directed by Ecology.
Permittees unable to submit electronically through Ecology’s WQWebPortal must
contact Ecology to request a waiver and obtain instructions on how to submit an
annual report in an alternative format.
B. Each Permittee is required to keep all records related to this permit and the SWMP
for at least five years.
C. Each Permittee shall make all records related to this permit and the Permittee’s
SWMP available to the public at reasonable times during business hours. The
Permittee will provide a copy of the most recent annual report to any individual or
entity, upon request.
1. A reasonable charge may be assessed by the Permittee for making photocopies of
records.
2. The Permittee may require reasonable advance notice of intent to review records
related to this Permit.
D. The annual report for cities, towns, and counties
Each annual report shall include the following:
1. A copy of the Permittee’s current SWMP Plan as required by S5.A.2.
2. Submittal of the annual report form as provided by Ecology pursuant to S9.A,
describing the status of implementation of the requirements of this permit during
the reporting period.
3. Attachments to the annual report form including summaries, descriptions, reports,
and other information as required, or as applicable, to meet the requirements of
this permit during the reporting period. Refer to Appendix 3 for annual report
questions.
4. If applicable, notice that the MS4 is relying on another governmental entity to
satisfy any of the obligations under this permit.
5. Certification and signature pursuant to G19.D, and notification of any changes to
authorization pursuant to G19.C.
S9.D.6 S9.E.5
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 58 of 74
6. A notification of any annexations, incorporations or jurisdictional boundary
changes resulting in an increase or decrease in the Permittee’s geographic area of
permit coverage during the reporting period.
E. Annual report for Secondary Permittees
Each annual report shall include the following:
1. Submittal of the annual report form as provided by Ecology pursuant to S9.A,
describing the status of implementation of the requirements of this permit during
the reporting period.
2. Attachments to the annual report form including summaries, descriptions, reports,
and other information as required, or as applicable, to meet the requirements of
this permit during the reporting period. Refer to Appendix 4 for annual report
questions.
3. If applicable, notice that the MS4 is relying on another governmental entity to
satisfy any of the obligations under this permit.
4. Certification and signature pursuant to G19.D, and notification of any changes to
authorization pursuant to G19.C.
5. A notification of any jurisdictional boundary changes resulting in an increase or
decrease in the Secondary Permittee’s geographic area of permit coverage during
the reporting period.
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013
Modified January 16, 2015
Page 59 of 74
GENERAL CONDITIONS
G1. DISCHARGE VIOLATIONS
All discharges and activities authorized by this Permit shall be consistent with the terms
and conditions of this Permit.
G2. PROPER OPERATION AND MAINTENANCE
The Permittee shall at all times properly operate and maintain all facilities and systems of
collection, treatment, and control (and related appurtenances) which are installed or used
by the Permittee for pollution control to achieve compliance with the terms and conditions
of this Permit.
G3. NOTIFICATION OF DISCHARGE, INCLUDING SPILLS
If a Permittee has knowledge of a discharge, including spills, into or from a MS4 which
could constitute a threat to human health, welfare, or the environment, the Permittee shall
A. Take appropriate action to correct or minimize the threat to human health, welfare
and/or the environment.
B. Notify the Ecology regional office and other appropriate spill response authorities
immediately but in no case later than within 24 hours of obtaining that knowledge.
Ecology’s Northwest Regional Office 24-hour number is 425-649-7000 and
Ecology’s Southwest Regional Office the number is 360-407-6300.
C. Immediately report spills or other discharges which might cause bacterial
contamination of marine waters, such as discharges resulting from broken sewer lines
and failing onsite septic systems, to the Ecology regional office and to the
Department of Health, Shellfish Program. The Department of Health's shellfish
number is 360-236-3330 (business hours) or 360-789-8962 (24-hours).
D. Immediately report spills or discharges of oils or hazardous substances to the Ecology
regional office and to the Washington Emergency Management Division at 1-800-
258-5990.
G4. BYPASS PROHIBITED
The intentional bypass of stormwater from all or any portion of a stormwater treatment
BMP whenever the design capacity of the treatment BMP is not exceeded, is prohibited
unless the following conditions are met:
A. Bypass is: (1) unavoidable to prevent loss of life, personal injury, or severe property
damage; or (2) necessary to perform construction or maintenance-related activities
essential to meet the requirements of the Clean Water Act (CWA); and
B. There are no feasible alternatives to bypass, such as the use of auxiliary treatment
facilities, retention of untreated stormwater, or maintenance during normal dry
periods.
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"Severe property damage" means substantial physical damage to property, damage to
the treatment facilities which would cause them to become inoperable, or substantial
and permanent loss of natural resources which can reasonably be expected to occur in
the absence of a bypass.
G5. RIGHT OF ENTRY
The Permittee shall allow an authorized representative of Ecology, upon the presentation of
credentials and such other documents as may be required by law at reasonable times:
A. To enter upon the Permittee's premises where a discharge is located or where any
records must be kept under the terms and conditions of this Permit;
B. To have access to, and copy at reasonable cost and at reasonable times, any records
that must be kept under the terms of the Permit;
C. To inspect at reasonable times any monitoring equipment or method of monitoring
required in the Permit;
D. To inspect at reasonable times any collection, treatment, pollution management, or
discharge facilities; and
E. To sample at reasonable times any discharge of pollutants.
G6. DUTY TO MITIGATE
The Permittee shall take all reasonable steps to minimize or prevent any discharge in
violation of this Permit which has a reasonable likelihood of adversely affecting human
health or the environment.
G7. PROPERTY RIGHTS
This permit does not convey any property rights of any sort, or any exclusive privilege.
G8. COMPLIANCE WITH OTHER LAWS AND STATUTES
Nothing in the Permit shall be construed as excusing the Permittee from compliance with
any other applicable federal, state, or local statutes, ordinances, or regulations.
G9. MONITORING
A. Representative Sampling:
Samples and measurements taken to meet the requirements of this Permit shall be
representative of the volume and nature of the monitored discharge, including
representative sampling of any unusual discharge or discharge condition, including
bypasses, upsets, and maintenance-related conditions affecting effluent quality.
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B. Records Retention:
The Permittee shall retain records of all monitoring information, including all
calibration and maintenance records and all original recordings for continuous
monitoring instrumentation, copies of all reports required by this Permit, and records
of all data used to complete the application for this permit, for a period of at least five
years. This period of retention shall be extended during the course of any unresolved
litigation regarding the discharge of pollutants by the Permittee or when requested by
the Ecology. On request, monitoring data and analysis shall be provided to Ecology.
C. Recording of Results:
For each measurement or sample taken, the Permittee shall record the following
information: (1) the date, exact place and time of sampling; (2) the individual who
performed the sampling or measurement; (3) the dates the analyses were performed;
(4) who performed the analyses; (5) the analytical techniques or methods used; and
(6) the results of all analyses.
D. Test Procedures:
All sampling and analytical methods used to meet the monitoring requirements in this
Permit shall conform to the Guidelines Establishing Test Procedures for the Analysis
of Pollutants contained in 40 CFR Part 136, unless otherwise specified in this permit
or approved in writing by Ecology.
E. Flow Measurement:
Appropriate flow measurement devices and methods consistent with accepted
scientific practices shall be selected and used to ensure the accuracy and reliability of
measurements of the volume of monitored discharges. The devices shall be installed,
calibrated, and maintained to ensure that the accuracy of the measurements is
consistent with the accepted industry standard for that type of device. Frequency of
calibration shall be in conformance with manufacturer's recommendations or at a
minimum frequency of at least one calibration per year. Calibration records should be
maintained for a minimum of three years.
F. Lab Accreditation:
All monitoring data, except for flow, temperature, conductivity, pH, total residual
chlorine, and other exceptions approved by Ecology, shall be prepared by a laboratory
registered or accredited under the provisions of, Accreditation of Environmental
Laboratories, chapter 173-50 WAC. Soils and hazardous waste data are exempted
from this requirement pending accreditation of laboratories for analysis of these
media by Ecology. Quick methods of field detection of pollutants including nutrients,
surfactants, salinity, and other parameters are exempted from this requirement when
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the purpose of the sampling is identification and removal of a suspected illicit
discharge.
G. Additional Monitoring:
Ecology may establish specific monitoring requirements in addition to those
contained in this permit by administrative order or permit modification.
G10. REMOVED SUBSTANCES
With the exception of decant from street waste vehicles, the Permittee shall not allow
collected screenings, grit, solids, sludges, filter backwash, or other pollutants removed in
the course of treatment or control of stormwater to be resuspended or reintroduced to the
storm sewer system or to waters of the state. Decant from street waste vehicles resulting
from cleaning stormwater facilities may be reintroduced only when other practical means
are not available and only in accordance with the Street Waste Disposal Guidelines in
Appendix 6. Solids generated from maintenance of the MS4 may be reclaimed, recycled, or
reused when allowed by local codes and ordinances. Soils that are identified as
contaminated pursuant to chapter 173-350 WAC shall be disposed at a qualified solid waste
disposal facility (see Appendix 6).
G11. SEVERABILITY
The provisions of this Permit are severable, and if any provision of this Permit, or the
application of any provision of this permit to any circumstance, is held invalid, the
application of such provision to other circumstances, and the remainder of this Permit shall
not be affected thereby.
G12. REVOCATION OF COVERAGE
The director may terminate coverage under this General Permit in accordance with chapter
43.21B RCW and chapter 173-226 WAC. Cases where coverage may be terminated
include, but are not limited to the following:
A. Violation of any term or condition of this general permit;
B. Obtaining coverage under this general permit by misrepresentation or failure to
disclose fully all relevant facts;
C. A change in any condition that requires either a temporary or permanent reduction or
elimination of the permitted discharge;
D. A determination that the permitted activity endangers human health or the
environment, or contributes significantly to water quality standards violations;
E. Failure or refusal of the Permittee to allow entry as required in chapter 90.48.090
RCW;
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F. Nonpayment of permit fees assessed pursuant to chapter 90.48.465 RCW;
Revocation of coverage under this general permit may be initiated by Ecology or
requested by any interested person.
G13. TRANSFER OF COVERAGE
The director may require any discharger authorized by this General Permit to apply for and
obtain an individual permit in accordance with chapter 43.21B RCW and chapter 173-226
WAC.
G14. GENERAL PERMIT MODIFICATION AND REVOCATION
This General Permit may be modified, revoked and reissued, or terminated in accordance
with the provisions of WAC 173-226-230. Grounds for modification, revocation and
reissuance, or termination include, but are not limited to the following:
A. A change occurs in the technology or practices for control or abatement of pollutants
applicable to the category of dischargers covered under this General Permit;
B. Effluent limitation guidelines or standards are promulgated pursuant to the CWA or
chapter 90.48 RCW, for the category of dischargers covered under this General
Permit;
C. A water quality management plan containing requirements applicable to the category
of dischargers covered under this General Permit is approved; or
D. Information is obtained which indicates that cumulative effects on the environment
from dischargers covered under this General Permit are unacceptable.
E. Changes in state law that reference this permit.
G15. REPORTING A CAUSE FOR MODIFICATION OR REVOCATION
A Permittee who knows or has reason to believe that any activity has occurred or will occur
which would constitute cause for modification or revocation and reissuance under
Condition G12, G14, or 40 CFR 122.62 must report such plans, or such information, to
Ecology so that a decision can be made on whether action to modify, or revoke and reissue
this Permit will be required. Ecology may then require submission of a new or amended
application. Submission of such application does not relieve the Permittee of the duty to
comply with this Permit until it is modified or reissued.
G16. APPEALS
A. The terms and conditions of this General Permit, as they apply to the appropriate
class of dischargers, are subject to appeal within thirty days of issuance of this
General Permit, in accordance with chapter 43.21B RCW, and chapter 173-226
WAC.
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B. The terms and conditions of this General Permit, as they apply to an individual
discharger, are appealable in accordance with chapter 43.21B RCW within thirty days
of the effective date of coverage of that discharger. Consideration of an appeal of
General Permit coverage of an individual discharger is limited to the General Permit's
applicability or nonapplicability to that individual discharger.
C. The appeal of General Permit coverage of an individual discharger does not affect
any other dischargers covered under this General Permit. If the terms and conditions
of this General Permit are found to be inapplicable to any individual discharger(s), the
matter shall be remanded to Ecology for consideration of issuance of an individual
permit or permits.
D. Modifications of this Permit are appealable in accordance with chapter 43.21B RCW
and chapter 173-226 WAC.
G17. PENALTIES
40 CFR 122.41(a)(2) and (3), 40 CFR 122.41(j)(5), and 40 CFR 122.41(k)(2) are hereby
incorporated into this Permit by reference.
G18. DUTY TO REAPPLY
The Permittee shall apply for permit renewal at least 180 days prior to the specified
expiration date of this permit.
G19. CERTIFICATION AND SIGNATURE
All formal submittals to Ecology shall be signed and certified.
A. All permit applications shall be signed by either a principal executive officer or
ranking elected official.
B. All formal submittals required by this Permit shall be signed by a person described
above or by a duly authorized representative of that person. A person is a duly
authorized representative only if:
1. The authorization is made in writing by a person described above and submitted
to Ecology, and
2. The authorization specifies either an individual or a position having responsibility
for the overall development and implementation of the stormwater management
program. (A duly authorized representative may thus be either a named individual
or any individual occupying a named position.)
C. Changes to authorization. If an authorization under condition G19.B.2 is no longer
accurate because a different individual or position has responsibility for the overall
development and implementation of the stormwater management program, a new
authorization satisfying the requirements of condition G19.B.2 must be submitted to
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Ecology prior to or together with any reports, information, or applications to be
signed by an authorized representative.
D. Certification. Any person signing a formal submittal under this Permit shall make the
following certification:
“I certify, under penalty of law, that this document and all attachments were prepared
under my direction or supervision in accordance with a system designed to assure that
Qualified Personnel properly gathered and evaluated the information submitted.
Based on my inquiry of the person or persons who manage the system or those
persons directly responsible for gathering information, the information submitted is,
to the best of my knowledge and belief, true, accurate, and complete. I am aware that
there are significant penalties for submitting false information, including the
possibility of fine and imprisonment for willful violations.”
G20. NON-COMPLIANCE NOTIFICATION
In the event a Permittee is unable to comply with any of the terms and conditions of this
Permit, the Permittee must:
A. Notify Ecology of the failure to comply with the permit terms and conditions in
writing within 30 days of becoming aware that the non-compliance has occurred. The
written notification must include all of the following:
1. A description of the non-compliance, including dates.
2. Beginning and end dates of the non-compliance, and if the compliance has not
been corrected, the anticipated date of correction.
3. Steps taken or planned to reduce, eliminate, or prevent reoccurrence of the non-
compliance.
B. Take appropriate action to stop or correct the condition of non-compliance.
G21. UPSETS
Permittees must meet the conditions of 40 CFR 122.41(n) regarding “Upsets.” The
conditions are as follows:
A. Definition. “Upset” means an exceptional incident in which there is unintentional and
temporary noncompliance with technology based permit effluent limitations because
of factors beyond the reasonable control of the Permittee. An upset does not include
noncompliance to the extent caused by operational error, improperly designed
treatment facilities, inadequate treatment facilities, lack of preventive maintenance, or
careless or improper operation.
B. Effect of an upset. An upset constitutes an affirmative defense to an action brought
for noncompliance with such technology based permit effluent limitations if the
requirements of paragraph (C) of this condition are met. Any determination made
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during administrative review of claims that noncompliance was caused by upset, and
before an action for noncompliance, will not constitute final administrative action
subject to judicial review.
C. Conditions necessary for demonstration of upset. A Permittee who wishes to establish
the affirmative defense of upset must demonstrate, through properly signed
contemporaneous operating logs, or other relevant evidence that:
1. An upset occurred and that the Permittee can identify the cause(s) of the upset;
2. The permitted facility was at the time being properly operated; and
3. The Permittee submitted notice of the upset as required in 40 CFR
122.41(l)(6)(ii)(B) (24-hour notice of noncompliance).
4. The Permittee complied with any remedial measures required under 40 CFR
122.41(d) (Duty to Mitigate).
D. Burden of proof. In any enforcement proceeding, the Permittee seeking to establish
the occurrence of an upset has the burden of proof.
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DEFINITIONS AND ACRONYMS
This section includes definitions for terms used in the body of the permit and in all the
appendices except Appendix 1. Terms defined in Appendix 1 are necessary to implement
requirements related to Appendix 1.
40 CFR means Title 40 of the Code of Federal Regulations, which is the codification of the
general and permanent rules published in the Federal Register by the executive departments
and agencies of the federal government.
AKART means all known, available, and reasonable methods of prevention, control and
treatment. See also State Water Pollution Control Act, chapter 90.48.010 RCW and chapter
90.48.520 RCW.
All known, available and reasonable methods of prevention, control and treatment refers to
the State Water Pollution Control Act, chapter 90.48.010 RCW and chapter 90.48.520 RCW.
Applicable TMDL means a TMDL which has been approved by EPA on or before the issuance
date of this Permit, or prior to the date that Ecology issues coverage under this Permit,
whichever is later.
Beneficial Uses means uses of waters of the state, which include but are not limited to use for
domestic, stock watering, industrial, commercial, agricultural, irrigation, mining, fish and
wildlife maintenance and enhancement, recreation, generation of electric power and
preservation of environmental and aesthetic values, and all other uses compatible with the
enjoyment of the public waters of the state.
Best Management Practices are the schedules of activities, prohibitions of practices,
maintenance procedures, and structural and/or managerial practices approved by Ecology
that, when used singly or in combination, prevent or reduce the release of pollutants and
other adverse impacts to waters of Washington State.
BMP means Best Management Practice.
Bypass means the diversion of stormwater from any portion of a stormwater treatment facility.
Census defined urban area means Urbanized Area.
Circuit means a portion of a MS4 discharging to a single point or serving a discrete area
determined by traffic volumes, land use, topography or the configuration of the MS4.
Component or Program Component means an element of the Stormwater Management
Program listed in S5 Stormwater Management Program for Cities, Towns, and Counties or
S6 Stormwater Management Program for Secondary Permittees, S7 Compliance with Total
Maximum Daily Load Requirements, or S8 Monitoring of this permit.
Conveyance system means that portion of the municipal separate storm sewer system designed
or used for conveying stormwater.
Co-Permittee means an owner or operator of an MS4 which is in a cooperative agreement with
at least one other applicant for coverage under this permit. A Co-Permittee is an owner or
operator of a regulated MS4 located within or in proximity to another regulated MS4. A Co-
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Permittee is only responsible for permit conditions relating to discharges from the MS4 the
Co-Permittee owns or operates. See also 40 CFR 122.26(b)(1)
CWA means Clean Water Act (formerly referred to as the Federal Water Pollution Control Act
or Federal Water Pollution Control Act Amendments of 1972) Pub.L. 92-500, as amended
Pub. L. 95-217, Pub. L. 95-576, Pub. L. (6-483 and Pub. L. 97-117, 33 U.S.C. 1251 et seq.).
Director means the Director of the Washington State Department of Ecology, or an authorized
representative.
Discharge Point means the location where a discharge leaves the Permittee’s MS4 through the
Permittee’s MS4 facilities/BMPs designed to infiltrate.
Entity means a governmental body, or a public or private organization.
EPA means the U.S. Environmental Protection Agency.
General Permit means a permit which covers multiple dischargers of a point source category
within a designated geographical area, in lieu of individual permits being issued to each
discharger.
Ground water means water in a saturated zone or stratum beneath the surface of the land or
below a surface water body. Refer to chapter 173-200 WAC.
Hazardous substance means any liquid, solid, gas, or sludge, including any material, substance,
product, commodity, or waste, regardless of quantity, that exhibits any of the physical,
chemical, or biological properties described in WAC 173-303-090 or WAC 173-303-100.
Heavy equipment maintenance or storage yard means an uncovered area where any heavy
equipment, such as mowing equipment, excavators, dump trucks, backhoes, or bulldozers are
washed or maintained, or where at least five pieces of heavy equipment are stored on a long-
term basis.
Highway means a main public road connecting towns and cities.
Hydraulically near means runoff from the site discharges to the sensitive feature without
significant natural attenuation of flows that allows for suspended solids removal. See
Appendix 7 Determining Construction Site Sediment Damage Potential for a more detailed
definition.
Hyperchlorinated means water that contains more than 10 mg/Liter chlorine.
Illicit connection means any infrastructure connection to the MS4 that is not intended, permitted
or used for collecting and conveying stormwater or non-stormwater discharges allowed as
specified in this permit (S5.C.3 and S6.D.3). Examples include sanitary sewer connections,
floor drains, channels, pipelines, conduits, inlets, or outlets that are connected directly to the
MS4.
Illicit discharge means any discharge to a MS4 that is not composed entirely of stormwater or of
non-stormwater discharges allowed as specified in this permit (S5.C.3 and S6.D.3).
Impervious surface means a non-vegetated surface area that either prevents or retards the entry
of water into the soil mantle as under natural conditions prior to development. A non-
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vegetated surface area which causes water to run off the surface in greater quantities or at an
increased rate of flow from the flow present under natural conditions prior to development.
Common impervious surfaces include, but are not limited to, roof tops, walkways, patios,
driveways, parking lots or stormwater areas, concrete or asphalt paving, gravel roads, packed
earthen materials, and oiled, macadam or other surfaces which similarly impede the natural
infiltration of stormwater.
Land disturbing activity means any activity that results in a change in the existing soil cover
(both vegetative and non-vegetative) and/or the existing soil topography. Land disturbing
activities include, but are not limited to clearing, grading, filling and excavation. Compaction
that is associated with stabilization of structures and road construction shall also be
considered land disturbing activity. Vegetation maintenance practices, including landscape
maintenance and gardening, are not considered land disturbing activity. Stormwater facility
maintenance is not considered land disturbing activity if conducted according to established
standards and procedures.
LID means Low Impact Development.
LID BMP means low impact development best management practices.
LID Principles means land use management strategies that emphasize conservation, use of on-
site natural features, and site planning to minimize impervious surfaces, native vegetation
loss, and stormwater runoff.
Low Impact Development means a stormwater and land use management strategy that strives to
mimic pre-disturbance hydrologic processes of infiltration, filtration, storage, evaporation
and transpiration by emphasizing conservation, use of on-site natural features, site planning,
and distributed stormwater management practices that are integrated into a project design.
Low impact development best management practices means distributed stormwater
management practices, integrated into a project design, that emphasize pre-disturbance
hydrologic processes of infiltration, filtration, storage, evaporation and transpiration. LID
BMPs include, but are not limited to, bioretention,rain gardens, permeable pavements, roof
downspout controls, dispersion, soil quality and depth, vegetated roofs, minimum excavation
foundations, and water re-use.
Material Storage Facilities means an uncovered area where bulk materials (liquid, solid,
granular, etc.) are stored in piles, barrels, tanks, bins, crates, or other means.
Maximum Extent Practicable refers to paragraph 402(p)(3)(B)(iii) of the federal Clean Water
Act which reads as follows: Permits for discharges from municipal storm sewers shall require
controls to reduce the discharge of pollutants to the maximum extent practicable, including
management practices, control techniques, and system, design, and engineering methods, and
other such provisions as the Administrator or the State determines appropriate for the control
of such pollutants.
MEP means Maximum Extent Practicable.
MS4 means municipal separate storm sewer system.
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Municipal Separate Storm Sewer System means a conveyance, or system of conveyances
(including roads with drainage systems, municipal streets, catch basins, curbs, gutters,
ditches, manmade channels, or storm drains):
(i) Owned or operated by a state, city, town, borough, county, parish, district, association,
or other public body (created by or pursuant to state law) having jurisdiction over
disposal of wastes, stormwater, or other wastes, including special districts under State
law such as a sewer district, flood control district or drainage district, or similar entity,
or an Indian tribe or an authorized Indian tribal organization, or a designated and
approved management agency under section 208 of the CWA that discharges to waters
of Washington State.
(ii) Designed or used for collecting or conveying stormwater.
(iii) Which is not a combined sewer;
(iv) Which is not part of a Publicly Owned Treatment Works (POTW) as defined at 40 CFR
122.2.; and
(v) Which is defined as “large” or “medium” or “small” or otherwise designated by
Ecology pursuant to 40 CFR 122.26.
National Pollutant Discharge Elimination System means the national program for issuing,
modifying, revoking, and reissuing, terminating, monitoring and enforcing permits, and
imposing and enforcing pretreatment requirements, under sections 307, 402, 318, and 405 of
the Federal Clean Water Act, for the discharge of pollutants to surface waters of the state
from point sources. These permits are referred to as NPDES permits and, in Washington
State, are administered by the Washington State Department of Ecology.
Native vegetation means vegetation comprised of plant species, other than noxious weeds, that
are indigenous to the coastal region of the Pacific Northwest and which reasonably could
have been expected to naturally occur on the site. Examples include trees such as Douglas
Fir, western hemlock, western red cedar, alder, big-leaf maple; shrubs such as willow,
elderberry, salmonberry, and salal; and herbaceous plants such as sword fern, foam flower,
and fireweed.
New development means land disturbing activities, including Class IV General Forest Practices
that are conversions from timber land to other uses; structural development, including
construction or installation of a building or other structure; creation of hard surfaces; and
subdivision, short subdivision and binding site plans, as defined and applied in chapter 58.17
RCW. Projects meeting the definition of redevelopment shall not be considered new
development. Refer to Appendix 1 for a definition of hard surfaces.
New Permittee means a city, town, or county that is subject to the Western Washington
Municipal Stormwater General Permit and was not subject to the permit prior to August 1,
2013.
New Secondary Permittee means a Secondary Permittee that is covered under a municipal
stormwater general permit and was not covered by the permit prior to August 1, 2013.
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NOI means Notice of Intent.
Notice of Intent means the application for, or a request for coverage under a General Permit
pursuant to WAC 173-226-200.
Notice of Intent for Construction Activity means the application form for coverage under the
Construction Stormwater General Permit.
Notice of Intent for Industrial Activity means the application form for coverage under the
General Permit for Stormwater Discharges Associated with Industrial Activities.
NPDES means National Pollutant Discharge Elimination System.
Outfall means a point source as defined by 40 CFR 122.2 at the point where a discharge leaves
the Permittee’s MS4 and enters a surface receiving waterbody or surface receiving waters.
Outfall does not include pipes, tunnels, or other conveyances which connect segments of the
same stream or other surface waters and are used to convey primarily surface waters (i.e.,
culverts).
Permittee unless otherwise noted, the term “Permittee” includes city, town, or county Permittee,
Co-Permittee, New Permittee, Secondary Permittee, and New Secondary Permittee.
Physically Interconnected means that one MS4 is connected to another storm sewer system in
such a way that it allows for direct discharges to the second system. For example, the roads
with drainage systems and municipal streets of one entity are physically connected directly to
a storm sewer system belonging to another entity.
Project site means that portion of a property, properties, or right-of-ways subject to land
disturbing activities, new hard surfaces, or replaced hard surfaces. Refer to Appendix 1 for a
definition of hard surfaces.
QAPP means Quality Assurance Project Plan.
Qualified Personnel means someone who has had professional training in the aspects of
stormwater management for which they are responsible and are under the functional control
of the Permittee. Qualified Personnel may be staff members, contractors, or volunteers.
Quality Assurance Project Plan means a document that describes the objectives of an
environmental study and the procedures to be followed to achieve those objectives.
RCW means the Revised Code of Washington State.
Receiving waterbody or receiving waters means naturally and/or reconstructed naturally
occurring surface water bodies, such as creeks, streams, rivers, lakes, wetlands, estuaries, and
marine waters, or ground water, to which a MS4 discharges.
Redevelopment means, on a site that is already substantially developed (i.e., has 35% or more of
existing hard surface coverage), the creation or addition of hard surfaces; the expansion of a
building footprint or addition or replacement of a structure; structural development including
construction, installation or expansion of a building or other structure; replacement of hard
surface that is not part of a routine maintenance activity; and land disturbing activities. Refer
to Appendix 1 for a definition of hard surfaces.
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Regional Stormwater Monitoring Program means, for all of western Washington, a
stormwater-focused monitoring and assessment program consisting of these components:
status and trends monitoring in small streams and marine nearshore areas, stormwater
management program effectiveness studies, and a source identification information
repository (SIDIR). The priorities and scope for the RSMP are set by a formal stakeholder
group. For this permit term, RSMP status and trends monitoring will be conducted in the
Puget Sound basin only.
Regulated Small Municipal Separate Storm Sewer System means a Municipal Separate
Storm Sewer System which is automatically designated for inclusion in the Phase II
stormwater permitting program by its location within an Urbanized Area, or by designation
by Ecology and is not eligible for a waiver or exemption under S1.C.
RSMP means Regional Stormwater Monitoring Program.
Runoff is water that travels across the land surface and discharges to water bodies either directly
or through a collection and conveyance system. See also “Stormwater.”
Secondary Permittee is an operator of a regulated small MS4 which is not a city, town or
county. Secondary Permittees include special purpose districts and other public entities that
meet the criteria in S1.B.
Sediment/Erosion-Sensitive Feature means an area subject to significant degradation due to the
effect of construction runoff, or areas requiring special protection to prevent erosion. See
Appendix 7 Determining Construction Site Sediment Transport Potential for a more detailed
definition.
Shared water bodies means water bodies, including downstream segments, lakes and estuaries
that receive discharges from more than one Permittee.
SIDIR means Source Identification Information Repository.
Significant contributor means a discharge that contributes a loading of pollutants considered to
be sufficient to cause or exacerbate the deterioration of receiving water quality or instream
habitat conditions.
Small Municipal Separate Storm Sewer System means an MS4 that is not defined as “large”
or “medium” pursuant to 40 CFR 122.26(b)(4) & (7) or designated under 40 CFR 122.26
(a)(1)(v).
Source control BMP means a structure or operation that is intended to prevent pollutants from
coming into contact with stormwater through physical separation of areas or careful
management of activities that are sources of pollutants. The SWMMWW separates source
control BMPs into two types. Structural Source Control BMPs are physical, structural, or
mechanical devices, or facilities that are intended to prevent pollutants from entering
stormwater. Operational BMPs are non-structural practices that prevent or reduce pollutants
from entering stormwater. See Volume IV of the SWMMWW for details.
Stormwater means runoff during and following precipitation and snowmelt events, including
surface runoff, drainage or interflow.
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Stormwater Associated with Industrial and Construction Activity means the discharge from
any conveyance which is used for collecting and conveying stormwater, which is directly
related to manufacturing, processing or raw materials storage areas at an industrial plant, or
associated with clearing, grading and/or excavation, and is required to have an NPDES
permit in accordance with 40 CFR 122.26.
Stormwater Management Program means a set of actions and activities designed to reduce the
discharge of pollutants from the MS4 to the MEP and to protect water quality, and
comprising the components listed in S5 (for cities, towns, and counties) or S6 (for Secondary
Permittees) of this Permit and any additional actions necessary to meet the requirements of
applicable TMDLs pursuant to S7 Compliance with TMDL Requirements, and S8 Monitoring
and Assessment.
Stormwater Treatment and Flow Control BMPs/Facilities means detention facilities,
treatment BMPs/facilities, bioretention, vegetated roofs, and permeable pavements that help
meet Appendix 1 Minimum Requirements #6 (treatment), #7 (flow control), or both.
SWMMWW or Stormwater Management Manual for Western Washington means
Stormwater Management Manual for Western Washington (as amended in 2014)
SWMP means Stormwater Management Program.
TMDL means Total Maximum Daily Load.
Total Maximum Daily Load means a water cleanup plan. A TMDL is a calculation of the
maximum amount of a pollutant that a water body can receive and still meet water quality
standards, and an allocation of that amount to the pollutant’s sources. A TMDL is the sum of
the allowable loads of a single pollutant from all contributing point and nonpoint sources.
The calculation must include a margin of safety to ensure that the water body can be used for
the purposes the state has designated. The calculation must also account for seasonable
variation in water quality. Water quality standards are set by states, territories, and tribes.
They identify the uses for each water body, for example, drinking water supply, contact
recreation (swimming), and aquatic life support (fishing), and the scientific criteria to support
that use. The Clean Water Act, section 303, establishes the water quality standards and
TMDL programs.
Tributary conveyance means pipes, ditches, catch basins, and inlets owned or operated by the
Permittee and designed or used for collecting and conveying stormwater.
UGA means Urban Growth Area.
Urban Growth Area means those areas designated by a county pursuant to RCW 36.70A.110.
Urbanized Area is a federally-designated land area comprising one or more places and the
adjacent densely settled surrounding area that together have a residential population of at
least 50,000 and an overall population density of at least 1,000 people per square mile.
Urbanized Areas are designated by the U.S. Census Bureau based on the most recent
decennial census.
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Vehicle Maintenance or Storage Facility means an uncovered area where any vehicles are
regularly washed or maintained, or where at least 10 vehicles are stored.
Water Quality Standards means Surface Water Quality Standards, chapter 173-201A WAC,
Ground Water Quality Standards, chapter 173-200 WAC, and Sediment Management
Standards, chapter 173-204 WAC.
Waters of the State includes those waters as defined as "waters of the United States" in 40 CFR
Subpart 122.2 within the geographic boundaries of Washington State and "waters of the
state" as defined in chapter 90.48 RCW which includes lakes, rivers, ponds, streams, inland
waters, underground waters, salt waters and all other surface waters and water courses within
the jurisdiction of the State of Washington.
Waters of the United States refers to the definition in 40 CFR 122.2.
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APPENDIX 1 – Minimum Technical Requirements for
New Development and Redevelopment
Section 1. Exemptions
Unless otherwise indicated in this Section 1, the practices described in this section are exempt
from the Minimum Requirements, even if such practices meet the definition of new development
or redevelopment.
Forest practices:
Forest practices regulated under Title 222 WAC, except for Class IV General forest practices
that are conversions from timberland to other uses, are exempt from the provisions of the
minimum requirements.
Commercial agriculture:
Commercial agriculture practices involving working the land for production are generally
exempt. However, the conversion from timberland to agriculture, and the construction of
impervious surfaces are not exempt.
Oil and Gas Field Activities or Operations:
Construction of drilling sites, waste management pits, and access roads, as well as construction
of transportation and treatment infrastructure such as pipelines natural gas treatment plants,
natural gas pipeline compressor stations, and crude oil pumping stations are exempt. Operators
are encouraged to implement and maintain Best Management Practices to minimize erosion and
control sediment during and after construction activities to help ensure protection of surface
water quality during storm events.
Pavement Maintenance:
The following pavement maintenance practices are exempt: pothole and square cut patching,
overlaying existing asphalt or concrete pavement with asphalt or concrete without expanding the
area of coverage, shoulder grading, reshaping/regrading drainage systems, crack sealing,
resurfacing with in-kind material without expanding the road prism, pavement preservation
activities that do not expand the road prism, and vegetation maintenance.
The following pavement maintenance practices are not categorically exempt. The extent to
which this Appendix applies is explained for each circumstance.
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• Removing and replacing a paved surface to base course or lower, or repairing the
pavement base: If impervious surfaces are not expanded, Minimum Requirements #1 - #5
apply.
• Extending the pavement edge without increasing the size of the road prism, or paving
graveled shoulders: These are considered new impervious surfaces and are subject to the
minimum requirements that are triggered when the thresholds identified for new or
redevelopment projects are met.
• Resurfacing by upgrading from dirt to gravel, asphalt, or concrete; upgrading from gravel
to asphalt, or concrete; or upgrading from a bituminous surface treatment (“chip seal”) to
asphalt or concrete: These are considered new impervious surfaces and are subject to the
minimum requirements that are triggered when the thresholds identified for new or
redevelopment projects are met.
Underground utility projects:
Underground utility projects that replace the ground surface with in-kind material or materials
with similar runoff characteristics are only subject to Minimum Requirement #2, Construction
Stormwater Pollution Prevention.
Section 2. Definitions Related to Minimum Requirements
Arterial – A road or street primarily for through traffic. The term generally includes roads or
streets considered collectors. It does not include local access roads which are generally limited to
providing access to abutting property. See also RCW 35.78.010, RCW 36.86.070, and RCW
47.05.021.
Bioretention – Engineered facilities that treat stormwater by passing it through a specified soil
profile, and either retain or detain the treated stormwater for flow attenuation. Refer to the
Stormwater Management Manual for Western Washington (SWMMWW), Chapter 7 of Volume V
for Bioretention BMP types and design specifications.
Certified Erosion and Sediment Control Lead (CESCL) – means an individual who has current
certification through an approved erosion and sediment control training program that meets the
minimum training standards established by the Washington Department of Ecology (Ecology)
(see BMP C160 in the Stormwater Management Manual for Western Washington (SWMMWW)).
A CESCL is knowledgeable in the principles and practices of erosion and sediment control. The
CESCL must have the skills to assess site conditions and construction activities that could impact
the quality of stormwater and, the effectiveness of erosion and sediment control measures used to
control the quality of stormwater discharges. Certification is obtained through an Ecology
approved erosion and sediment control course. Course listings are provided online at Ecology’s
website.
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Commercial Agriculture – means those activities conducted on lands defined in RCW
84.34.020(2) and activities involved in the production of crops or livestock for commercial trade.
An activity ceases to be considered commercial agriculture when the area on which it is
conducted is proposed for conversion to a nonagricultural use or has lain idle for more than five
years, unless the idle land is registered in a federal or state soils conservation program, or unless
the activity is maintenance of irrigation ditches, laterals, canals, or drainage ditches related to an
existing and ongoing agricultural activity.
Converted vegetation (areas) – The surfaces on a project site where native vegetation, pasture,
scrub/shrub, or unmaintained non-native vegetation (e.g., Himalayan blackberry, scotch broom)
are converted to lawn or landscaped areas, or where native vegetation is converted to pasture.
Discharge Point – the location where a discharge leaves the Permittee’s MS4 through the
Permittee’s MS4 facilities/BMPs designed to infiltrate.
Effective Impervious surface – Those impervious surfaces that are connected via sheet flow or
discrete conveyance to a drainage system. Impervious surfaces are considered ineffective if: 1)
the runoff is dispersed through at least one hundred feet of native vegetation in accordance with
BMP T5.30 – “Full Dispersion” as described in Chapter 5 of Volume V of the Stormwater
Management Manual for Western Washington (SWMMWW); 2) residential roof runoff is
infiltrated in accordance with Downspout Full Infiltration Systems in BMP T5.10A in Volume
III of the SWMMWW; or 3) approved continuous runoff modeling methods indicate that the
entire runoff file is infiltrated.
Erodible or leachable materials – Wastes, chemicals, or other substances that measurably alter
the physical or chemical characteristics of runoff when exposed to rainfall. Examples include
erodible soils that are stockpiled, uncovered process wastes, manure, fertilizers, oily substances,
ashes, kiln dust, and garbage dumpster leakage.
Hard Surface – An impervious surface, a permeable pavement, or a vegetated roof.
Highway – A main public road connecting towns and cities
Impervious surface – A non-vegetated surface area that either prevents or retards the entry of
water into the soil mantle as under natural conditions prior to development. A non-vegetated
surface area which causes water to run off the surface in greater quantities or at an increased rate
of flow from the flow present under natural conditions prior to development. Common
impervious surfaces include, but are not limited to, roof tops, walkways, patios, driveways,
parking lots or storage areas, concrete or asphalt paving, gravel roads, packed earthen materials,
and oiled, macadam or other surfaces which similarly impede the natural infiltration of
stormwater. Open, uncovered retention/detention facilities shall not be considered as impervious
surfaces for purposes of determining whether the thresholds for application of minimum
requirements are exceeded. Open, uncovered retention/detention facilities shall be considered
impervious surfaces for purposes of runoff modeling.
Land disturbing activity – Any activity that results in a change in the existing soil cover (both
vegetative and non-vegetative) and/or the existing soil topography. Land disturbing activities
include, but are not limited to clearing, grading, filling, and excavation. Compaction that is
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associated with stabilization of structures and road construction shall also be considered a land
disturbing activity. Vegetation maintenance practices, including landscape maintenance and
gardening, are not considered land-disturbing activity. Stormwater facility maintenance is not
considered land disturbing activity if conducted according to established standards and
procedures.
Low Impact Development (LID) – A stormwater and land use management strategy that strives
to mimic pre-disturbance hydrologic processes of infiltration, filtration, storage, evaporation and
transpiration by emphasizing conservation, use of on-site natural features, site planning, and
distributed stormwater management practices that are integrated into a project design.
LID Best Management Practices – Distributed stormwater management practices, integrated
into a project design, that emphasize pre-disturbance hydrologic processes of infiltration,
filtration, storage, evaporation and transpiration. LID BMPs include, but are not limited to,
bioretention,rain gardens, permeable pavements, roof downspout controls, dispersion, soil
quality and depth, minimal excavation foundations, vegetated roofs, and water re-use.
LID Principles – Land use management strategies that emphasize conservation, use of on-site
natural features, and site planning to minimize impervious surfaces, native vegetation loss, and
stormwater runoff.
Maintenance – Repair and maintenance includes activities conducted on currently serviceable
structures, facilities, and equipment that involves no expansion or use beyond that previously
existing and results in no significant adverse hydrologic impact. It includes those usual activities
taken to prevent a decline, lapse, or cessation in the use of structures and systems. Those usual
activities may include replacement of dysfunctional facilities, including cases where
environmental permits require replacing an existing structure with a different type structure, as
long as the functioning characteristics of the original structure are not changed. One example is
the replacement of a collapsed, fish blocking, round culvert with a new box culvert under the
same span, or width, of roadway. In regard to stormwater facilities, maintenance includes
assessment to ensure ongoing proper operation, removal of built up pollutants (i.e.
sediments), replacement of failed or failing treatment media, and other actions taken to correct
defects as identified in the maintenance standards of Chapter 4, Volume V of the Stormwater
Management Manual for Western Washington (SWMMWW). See also Pavement Maintenance
exemptions in Section 1 of this Appendix.
Native vegetation – Vegetation comprised of plant species, other than noxious weeds, that are
indigenous to the coastal region of the Pacific Northwest and which reasonably could have been
expected to naturally occur on the site. Examples include trees such as Douglas Fir, western
hemlock, western red cedar, alder, big-leaf maple, and vine maple; shrubs such as willow,
elderberry, salmonberry, and salal; and herbaceous plants such as sword fern, foam flower, and
fireweed.
New development – Land disturbing activities, including Class IV -general forest practices that
are conversions from timber land to other uses; structural development, including construction or
installation of a building or other structure; creation of hard surfaces; and subdivision, short
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subdivision and binding site plans, as defined and applied in Chapter 58.17 RCW. Projects
meeting the definition of redevelopment shall not be considered new development.
Outfall – a point source as defined by 40 CFR 122.2 at the point where a discharge leaves the
permittee’s MS4 and enters a surface receiving waterbody or surface receiving waters. Outfall
does not include pipes, tunnels, or other conveyances which connect segments of the same
stream or other surface waters and are used to convey primarily surface waters (i.e., culverts).
On-site Stormwater Management BMPs: As used in this appendix, a synonym for Low Impact
Development BMPs.
Permeable pavement – Pervious concrete, porous asphalt, permeable pavers or other forms of
pervious or porous paving material intended to allow passage of water through the pavement
section. It often includes an aggregate base that provides structural support and acts as a
stormwater reservoir.
Pervious Surface – Any surface material that allows stormwater to infiltrate into the ground.
Examples include lawn, landscape, pasture, native vegetation areas, and permeable pavements.
Pollution-generating hard surface (PGHS) – Those hard surfaces considered to be a significant
source of pollutants in stormwater runoff. See the listing of surfaces under pollution-generating
impervious surface.
Pollution-generating impervious surface (PGIS) – Those impervious surfaces considered to be
a significant source of pollutants in stormwater runoff. Such surfaces include those which are
subject to: vehicular use; industrial activities (as further defined in the glossary of the
Stormwater Management Manual for Western Washington (SWMMWW)); storage of erodible or
leachable materials, wastes, or chemicals, and which receive direct rainfall or the run-on or
blow-in of rainfall; metal roofs unless they are coated with an inert, non-leachable material (e.g.,
baked-on enamel coating); or roofs that are subject to venting significant amounts of dusts, mists,
or fumes from manufacturing, commercial, or other indoor activities.
Pollution-generating pervious surfaces (PGPS) – Any non-impervious surface subject to
vehicular use, industrial activities (as further defined in the glossary of the Stormwater
Management Manual for Western Washington (SWMMWW); or storage of erodible or leachable
materials, wastes, or chemicals, and that receive direct rainfall or run-on or blow-in of rainfall,
use of pesticides and fertilizers, or loss of soil. Typical PGPS include permeable pavement
subject to vehicular use, lawns, and landscaped areas including: golf courses, parks, cemeteries,
and sports fields (natural and artificial turf).
Pre-developed condition – The native vegetation and soils that existed at a site prior to the
influence of Euro-American settlement. The pre-developed condition shall be assumed to be a
forested land cover unless reasonable, historic information is provided that indicates the site was
prairie prior to settlement.
Project site – That portion of a property, properties, or right of way subject to land disturbing
activities, new hard surfaces, or replaced hard surfaces.
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Rain Garden – A non-engineered shallow landscaped depression, with compost-amended native
soils and adapted plants. The depression is designed to pond and temporarily store stormwater
runoff from adjacent areas, and to allow stormwater to pass through the amended soil profile.
Receiving waterbody or Receiving waters – naturally and/or reconstructed naturally occurring
surface water bodies, such as creeks, streams, rivers, lakes, wetlands, estuaries, and marine
waters, or groundwater, to which a MS4 discharges.
Redevelopment – On a site that is already substantially developed (i.e., has 35% or more of
existing hard surface coverage), the creation or addition of hard surfaces; the expansion of a
building footprint or addition or replacement of a structure; structural development including
construction, installation or expansion of a building or other structure; replacement of hard
surface that is not part of a routine maintenance activity; and land disturbing activities.
Replaced hard surface – For structures, the removal and replacement of hard surfaces down to
the foundation. For other hard surfaces, the removal down to bare soil or base course and
replacement.
Replaced impervious surface – For structures, the removal and replacement of impervious
surfaces down to the foundation. For other impervious surfaces, the removal down to bare soil
or base course and replacement.
Site – The area defined by the legal boundaries of a parcel or parcels of land that is (are) subject
to new development or redevelopment. For road projects, the length of the project site and the
right-of-way boundaries define the site.
Source control BMP – A structure or operation that is intended to prevent pollutants from
coming into contact with stormwater through physical separation of areas or careful management
of activities that are sources of pollutants. The Stormwater Management Manual for Western
Washington (SWMMWW) separates source control BMPs into two types. Structural Source
Control BMPs are physical, structural, or mechanical devices, or facilities that are intended to
prevent pollutants from entering stormwater. Operational BMPs are non-structural practices that
prevent or reduce pollutants from entering stormwater. See Volume IV of the SWMMWW for
details.
Threshold Discharge Area – An on-site area draining to a single natural discharge location or
multiple natural discharge locations that combine within one-quarter mile downstream (as
determined by the shortest flowpath). The examples in Figure 2.1 below illustrate this definition.
The purpose of this definition is to clarify how the thresholds of this appendix are applied to
project sites with multiple discharge points.
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Vehicular Use – Regular use of an impervious or pervious surface by motor vehicles. The
following are subject to regular vehicular use: roads, un-vegetated road shoulders, bike lanes
within the traveled lane of a roadway, driveways, parking lots, unrestricted access fire lanes,
vehicular equipment storage yards, and airport runways.
The following are not considered subject to regular vehicular use: paved bicycle pathways
separated from and not subject to drainage from roads for motor vehicles, restricted access fire
lanes, and infrequently used maintenance access roads.
Wetland – Those areas that are inundated or saturated by surface or ground water at a frequency
and duration sufficient to support, and that under normal circumstances do support, a prevalence
of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include
swamps, marshes, bogs, and similar areas. Wetlands do not include those artificial wetlands
intentionally created from non-wetland sites, including, but not limited to, irrigation and drainage
ditches, grass-lined swales, canals, detention facilities, wastewater treatment facilities, farm
ponds, and landscape amenities, or those wetlands created after July 1, 1990, that were
unintentionally created as a result of the construction of a road, street, or highway. Wetlands may
include those artificial wetlands intentionally created from non-wetland areas to mitigate the
conversion of wetlands.
Figure 2.1 Threshold Discharge Areas
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Section 3. Applicability of the Minimum Requirements
3.1 Thresholds
Not all of the Minimum Requirements apply to every development or redevelopment
project. The applicability varies depending on the project type and size. This section
identifies thresholds that determine the applicability of the Minimum Requirements to
projects. Use the flow charts in Figures 3.1, 3.2, and 3.3 to determine which of the
Minimum Requirements apply. The Minimum Requirements themselves are presented in
Section 4 of this Appendix.
Use the thresholds in sections 3.2 and 3.3 at the time of application for a subdivision,
plat, short plat, building permit, or other construction permit. The plat or short plat
approval shall identify all stormwater BMPs that are required for each lot. For projects
involving only land disturbing activities, (e.g., clearing or grading), the thresholds apply
at the time of application for the permit allowing or authorizing that activity. Note the
exemption in Section 1 for forest practices other than Class IV General.
Will the project discharge
stormwater either directly or
indirectly into an MS4 owned or
operated by the Permittee?
Permittee is not required
to apply the Minimum
Requirements to the
project.
Continue with Figure 3.2 and 3.3
No
Yes
Figure 3.1 Flow Chart for Determining Whether
the Permittee Must Regulate the Project
Is the Project exempt according to
Section 1 of this Appendix?
No
Yes
START
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Yes
Yes Yes
No
No
Yes No
Yes
No
Does the project convert
¾ acres or more of
vegetation to lawn or
landscaped areas, or
convert 2.5 acres or more
of native vegetation to
pasture?
See Redevelopment
Minimum
Requirements and
Flow Chart
(Figure 3.3)
Minimum
Requirement #2
applies.
Does the project
result in 5,000
square feet, or
greater, of new plus
replaced hard
surface area?
All Minimum
Requirements apply
to the new and
replaced hard surfaces
and converted
vegetation areas.
Does the project
result in 2,000 square
feet, or greater, of
new plus replaced
hard surface area?
Minimum Requirements
#1 through #5 apply to
the new and replaced
hard surfaces and the
land disturbed.
Does the project have
land disturbing
activities of 7,000
square feet or greater?
Start Here
No
Does the site have
35% or more of
existing impervious
coverage?
Figure 3.2 Flow Chart for Determining Requirements for New Development
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All Minimum Requirements apply to the new and
replaced hard surfaces and converted vegetation areas.
Yes
No
Next Question
Yes
Next
Question
No
Yes
No
Minimum Requirements #1 through #5 apply to
the new and replaced hard surfaces and the land
disturbed.
Minimum Requirements #2 applies.
Does the project add 5,000 square feet or more of new hard surfaces?
OR
Convert ¾ acres or more of vegetation to lawn or landscaped areas?
OR
Convert 2.5 acres or more of native vegetation to pasture?
All Minimum Requirements apply to the
new hard surfaces and the converted
vegetation areas.
Is this a road
related project?
Does the project add 5,000 square feet or more of new hard surfaces?
Yes
Yes
Yes
No
No
No
Do new hard surfaces add 50% or
more to the existing hard surfaces
within the project limits?
No additional
requirements
No additional
requirements
Figure 3.3 Flow Chart for Determining Requirements for Redevelopment
Does the project result in 2,000 square feet, or more, of new plus replaced hard surface area?
OR
Does the land disturbing activity total 7,000 square feet or greater?
Is the total of new plus replaced hard surfaces
5,000 square feet or more, AND does the value
of the proposed improvements – including
interior improvements – exceed 50% of the
assessed value (or replacement value) of the
existing site improvements?
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3.2 New Development
All new development shall be required to comply with Minimum Requirement #2.
The following new development shall comply with Minimum Requirements #1 through
#5 for the new and replaced hard surfaces and the land disturbed:
• Results in 2,000 square feet, or greater, of new plus replaced hard surface area, or
• Has land disturbing activity of 7,000 square feet or greater.
The following new development shall comply with Minimum Requirements #1 through
#9 for the new and replaced hard surfaces and the converted vegetation areas:
• Results in 5,000 square feet, or greater, of new plus replaced hard surface area, or
• Converts ¾ acres, or more, of vegetation to lawn or landscaped areas, or
• Converts 2.5 acres, or more, of native vegetation to pasture.
3.3 Redevelopment
All redevelopment shall be required to comply with Minimum Requirement #2.
The following redevelopment shall comply with Minimum Requirements #1 through #5
for the new and replaced hard surfaces and the land disturbed:
• Results in 2,000 square feet, or more, of new plus replaced hard surface area, or
• Has land disturbing activity of 7,000 square feet or greater.
The following redevelopment shall comply with Minimum Requirements #1 through #9
for the new hard surfaces and converted vegetation areas:
• Adds 5,000 square feet or more of new hard surfaces or,
• Converts ¾ acres, or more, of vegetation to lawn or landscaped areas, or
• Converts 2.5 acres, or more, of native vegetation to pasture.
The local government may allow the Minimum Requirements to be met for an equivalent
(flow and pollution characteristics) area within the same site. For public road projects, the
equivalent area does not have to be within the project limits, but must drain to the same
receiving water.
3.4 Additional Requirements for Re-development Project Sites
For road-related projects, runoff from the replaced and new hard surfaces (including
pavement, shoulders, curbs, and sidewalks) and the converted vegetation areas shall meet
all the Minimum Requirements if the new hard surfaces total 5,000 square feet or more
and total 50% or more of the existing hard surfaces within the project limits. The project
limits shall be defined by the length of the project and the width of the right-of-way.
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Other types of redevelopment projects shall comply with Minimum Requirements #1
through #9 for the new and replaced hard surfaces and the converted vegetation areas if
the total of new plus replaced hard surfaces is 5,000 square feet or more, and the
valuation of proposed improvements – including interior improvements – exceeds 50% of
the assessed value of the existing site improvements.
The Permittee may exempt or institute a stop-loss provision for redevelopment projects
from compliance with Minimum Requirement #5 On-site Stormwater Management,
Minimum Requirement #6 Runoff Treatment, Minimum Requirement #7 Flow Control
and/or Minimum Requirement #8 Wetlands Protection as applied to the replaced hard
surfaces if the Permittee has adopted a plan and a schedule that fulfills those requirements
in regional facilities.
The Permittee may grant a variance/exception to the application of the flow control
requirements to replaced impervious surfaces if such application imposes a severe
economic hardship. See Section 6 of this Appendix.
3.5 Modification of the Minimum Requirements
Basin Planning is encouraged and may be used to tailor Minimum Requirement #5
On-site Stormwater Management, Minimum Requirement #6 Runoff Treatment,
Minimum Requirement #7 Flow Control, and/or Minimum Requirement #8 Wetlands
Protection. Basin planning may also be used to demonstrate an equivalent level of
treatment, flow control, and/or wetland protection through the construction and use of
regional stormwater facilities. See Section 7 of this Appendix for details on Basin
Planning and how Permittees may use basin planning to modify the Minimum
Requirements in Section 4.
Section 4. Minimum Requirements
This Section describes the Minimum Requirements for stormwater management at new
development and redevelopment sites. Section 3 of this Appendix should be consulted to
determine which of the minimum requirements below apply to any given project. Figures
3.2 and 3.3 should be consulted to determine whether the minimum requirements apply to
new surfaces, replaced surfaces, or new and replaced surfaces.
4.1 Minimum Requirement #1: Preparation of Stormwater Site Plans
The permittee shall require a Stormwater Site Plan from all projects meeting the
thresholds in Section 3.1 of this Appendix. Stormwater Site Plans shall use site-
appropriate development principles, as required and encouraged by local development
codes, to retain native vegetation and minimize impervious surfaces to the extent feasible.
Stormwater Site Plans shall be prepared in accordance with Chapter 3 of Volume 1 of the
Stormwater Management Manual for Western Washington (SWMMWW).
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4.2 Minimum Requirement #2: Construction Stormwater Pollution Prevention Plan
(SWPPP)
Permittees may choose to allow compliance with this Minimum Requirement to be
achieved for an individual site if the site is covered under Ecology’s General NPDES
Permit for Stormwater Discharges Associated with Construction Activities and fully
implementing the requirements of that permit.
Thresholds
All new development and redevelopment projects are responsible for preventing erosion
and discharge of sediment and other pollutants into receiving waters.
Permittees must require a Construction Stormwater Pollution Prevention Plan (SWPPP)
for all projects which result in 2,000 sq. ft. or more of new plus replaced hard surface
area, or which disturb 7,000 sq. ft. or more of land.
Projects below those thresholds are not required to prepare a Construction SWPPP, but
must consider all of the Elements listed below for Construction SWPPPs and develop
controls for all elements that pertain to the project site. The Permittee may develop an
abbreviated SWPPP format to meet the SWPPP requirement under this permit for project
sites that will disturb less than 1 acre.
General Requirements
The SWPPP shall include a narrative and drawings. All BMPs shall be clearly referenced
in the narrative and marked on the drawings. The SWPPP narrative shall include
documentation to explain and justify the pollution prevention decisions made for the
project. Each of the thirteen elements listed below must be considered and included in the
SWPPP unless site conditions render the element unnecessary and the exemption from
that element is clearly justified in the narrative of the SWPPP.
Clearing and grading activities for developments shall be permitted only if conducted
pursuant to an approved site development plan (e.g., subdivision approval) that establishes
permitted areas of clearing, grading, cutting, and filling. These permitted clearing and
grading areas and any other areas required to preserve critical or sensitive areas, buffers,
native growth protection easements, or tree retention areas as may be required by local
jurisdictions, shall be delineated on the site plans and the development site.
The SWPPP shall be implemented beginning with initial land disturbance and until final
stabilization. Sediment and Erosion control BMPs shall be consistent with the BMPs
contained in chapter 4 of Volume II of the Stormwater Management Manual for Western
Washington (SWMMWW).
Seasonal Work Limitations - From October 1 through April 30, clearing, grading, and
other soil disturbing activities may only be authorized by the Permittee if silt-laden runoff
will be prevented from leaving the site through a combination of the following:
1. Site conditions including existing vegetative coverage, slope, soil type and
proximity to receiving waters; and
2. Limitations on activities and the extent of disturbed areas; and
3. Proposed erosion and sediment control measures.
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Based on the information provided and/or local weather conditions, the Permittee may
expand or restrict the seasonal limitation on site disturbance. The following activities are
exempt from the seasonal clearing and grading limitations:
1. Routine maintenance and necessary repair of erosion and sediment control BMPs,
2. Routine maintenance of public facilities or existing utility structures that do not
expose the soil or result in the removal of the vegetative cover to soil, and
3. Activities where there is one hundred percent infiltration of surface water runoff
within the site in approved and installed erosion and sediment control facilities.
Construction Stormwater Pollution Prevention Plan (SWPPP) Elements
1. Preserve Vegetation/Mark Clearing Limits:
a. Before beginning land disturbing activities, including clearing and grading,
clearly mark all clearing limits, sensitive areas and their buffers, and trees that are
to be preserved within the construction area.
b. Retain the duff layer, native top soil, and natural vegetation in an undisturbed
state to the maximum degree practicable.
2. Establish Construction Access:
a. Limit construction vehicle access and exit to one route, if possible.
b. Stabilize access points with a pad of quarry spalls, crushed rock, or other
equivalent BMPs, to minimize tracking of sediment onto public roads.
c. Locate wheel wash or tire baths on-site, if the stabilized constructions entrance is
not effective in preventing tracking sediment onto roads.
d. If sediment is tracked off site, clean the affected roadways thoroughly at the end
of each day, or more frequently as necessary (for example, during wet weather).
Remove sediment from roads by shoveling, sweeping, or pick up and transport the
sediment to a controlled sediment disposal area.
e. Conduct street washing only after sediment is removed in accordance with 2.d,
above.
f. Control street wash wastewater by pumping back on-site, or otherwise prevent it
from discharging into systems tributary to waters of the State.
3. Control Flow Rates:
a. Protect properties and waterways downstream of development sites from erosion
and the associated discharge of turbid waters due to increases in the velocity and
peak volumetric flow rate of stormwater runoff from the project site.
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b. Where necessary to comply with 3.a, above, construct stormwater retention or
detention facilities as one of the first steps in grading. Assure that detention
facilities function properly before constructing site improvements (e.g.,
impervious surfaces).
c. If permanent infiltration ponds are used for flow control during construction,
protect these facilities from siltation during the construction phase.
4. Install Sediment Controls:
a. Design, install, and maintain effective erosion controls and sediment controls to
minimize the discharge of pollutants.
b. Construct sediment control BMPs (sediment ponds, traps, filters, etc.) as one of
the first steps in grading. These BMPs shall be functional before other land
disturbing activities take place.
c. Minimize sediment discharges from the site. The design, installation and
maintenance of erosion and sediment controls must address factors such as the
amount, frequency, intensity and duration of precipitation, the nature of resulting
stormwater runoff, and soil characteristics, including the range of soil particle
sizes expected to be present on the site.
d. Direct stormwater runoff from disturbed areas through a sediment pond or other
appropriate sediment removal BMP, before the runoff leaves a construction site or
before discharge to an infiltration facility. Runoff from fully stabilized areas may
be discharged without a sediment removal BMP, but must meet the flow control
performance standard in 3.a, above.
e. Locate BMPs intended to trap sediment on-site in a manner to avoid interference
with the movement of juvenile salmonids attempting to enter off-channel areas or
drainages.
f. Where feasible, design outlet structures that withdraw impounded stormwater
from the surface to avoid discharging sediment that is still suspended lower in the
water column.
5. Stabilize Soils:
a. Stabilize exposed and unworked soils by application of effective BMPs that
prevent erosion. Applicable BMPs include, but are not limited to: temporary and
permanent seeding, sodding, mulching, plastic covering, erosion control fabrics
and matting, soil application of polyacrylamide (PAM), the early application of
gravel base early on areas to be paved, and dust control.
b. Control stormwater volume and velocity within the site to minimize soil erosion.
c. Control stormwater discharges, including both peak flow rates and total
stormwater volume, to minimize erosion at outlets and to minimize downstream
channel and stream bank erosion.
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d. Soils must not remain exposed and unworked for more than the time periods set
forth below to prevent erosion:
• During the dry season (May 1 – September 30): 7 days
• During the wet season (October 1 – April 30): 2 days
e. Stabilize soils at the end of the shift before a holiday or weekend if needed based
on the weather forecast.
f. Stabilize soil stockpiles from erosion, protect with sediment trapping measures,
and where possible, locate away from storm drain inlets, waterways and drainage
channels.
g. Minimize the amount of soil exposed during construction activity.
h. Minimize the disturbance of steep slopes.
i. Minimize soil compaction and, unless infeasible, preserve topsoil.
6. Protect Slopes:
a. Design and construct cut-and-fill slopes in a manner to minimize erosion.
Applicable practices include, but are not limited to, reducing continuous length of
slope with terracing and diversions, reducing slope steepness, and roughening
slope surfaces (for example, track walking).
b. Divert off-site stormwater (run-on) or ground water away from slopes and
disturbed areas with interceptor dikes, pipes and/or swales. Off-site stormwater
should be managed separately from stormwater generated on the site.
c. At the top of slopes, collect drainage in pipe slope drains or protected channels to
prevent erosion.
• Temporary pipe slope drains must handle the peak volumetric flow rate
calculated using a 10-minute time step from a Type 1A, 10-year, 24-hour
frequency storm for the developed condition. Alternatively, the 10-year 1-
hour flow rate predicted by an approved continuous runoff model, increased
by a factor of 1.6, may be used. The hydrologic analysis must use the existing
land cover condition for predicting flow rates from tributary areas outside the
project limits. For tributary areas on the project site, the analysis must use the
temporary or permanent project land cover condition, whichever will produce
the highest flow rates. If using the Western Washington Hydrology Model to
predict flows, bare soil areas should be modeled as “landscaped area.”
d. Place excavated material on the uphill side of trenches, consistent with safety and
space considerations.
e. Place check dams at regular intervals within constructed channels that are cut
down a slope.
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7. Protect Drain Inlets:
a. Protect storm drain inlets made operable during construction so that stormwater
runoff does not enter the conveyance system without first being filtered or treated
to remove sediment.
b. Clean or remove and replace inlet protection devices when sediment has filled
one-third of the available storage (unless a different standard is specified by the
product manufacturer).
8. Stabilize Channels and Outlets:
a. Design, construct, and stabilize all on-site conveyance channels to prevent erosion
from the following expected peak flows:
• Channels must handle the peak volumetric flow rate calculated using a 10-
minute time step from a Type 1A, 10-year, 24-hour frequency storm for the
developed condition. Alternatively, the 10-year, 1-hour flow rate indicated by
an approved continuous runoff model, increased by a factor of 1.6, may be
used. The hydrologic analysis must use the existing land cover condition for
predicting flow rates from tributary areas outside the project limits. For
tributary areas on the project site, the analysis shall use the temporary or
permanent project land cover condition, whichever will produce the highest
flow rates. If using the Western Washington Hydrology Model to predict
flows, bare soil areas should be modeled as “landscaped area.”
b. Provide stabilization, including armoring material, adequate to prevent erosion of
outlets, adjacent stream banks, slopes, and downstream reaches at the outlets of
all conveyance systems.
9. Control Pollutants:
a. Design, install, implement and maintain effective pollution prevention measures
to minimize the discharge of pollutants.
b. Handle and dispose all pollutants, including waste materials and demolition debris
that occur on-site in a manner that does not cause contamination of stormwater.
c. Provide cover, containment, and protection from vandalism for all chemicals,
liquid products, petroleum products, and other materials that have the potential to
pose a threat to human health or the environment. On-site fueling tanks must
include secondary containment. Secondary containment means placing tanks or
containers within an impervious structure capable of containing 110% of the
volume contained in the largest tank within the containment structure. Double-
walled tanks do not require additional secondary containment.
d. Conduct maintenance, fueling and repair of heavy equipment and vehicles using
spill prevention and control measures. Clean contaminated surfaces immediately
following any spill incident.
e. Discharge wheel wash or tire bath wastewater to a separate on-site treatment
system that prevents discharge to surface water, such as closed-loop recirculation
or upland application, or to the sanitary sewer, with local sewer district approval.
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f. Apply fertilizers and pesticides in a manner and at application rates that will not
result in loss of chemical to stormwater runoff. Follow manufacturers’ label
requirements for application rates and procedures.
g. Use BMPs to prevent contamination of stormwater runoff by pH modifying
sources. The sources for this contamination include, but are not limited to: bulk
cement, cement kiln dust, fly ash, new concrete washing and curing waters, waste
streams generated from concrete grinding and sawing, exposed aggregate
processes, dewatering concrete vaults, concrete pumping and mixer washout
waters.
h. Adjust the pH of stormwater if necessary to prevent violations of water quality
standards.
i. Assure that washout of concrete trucks is performed off-site or in designated
concrete washout areas only. Do not wash out concrete trucks onto the ground, or
into storm drains, open ditches, streets, or streams. Do not dump excess concrete
on-site, except in designated concrete washout areas. Concrete spillage or
concrete discharge to surface waters of the State is prohibited.
j. Obtain written approval from Ecology before using chemical treatment other than
CO2 or dry ice to adjust pH.
10. Control De-Watering:
a. Discharge foundation, vault, and trench de-watering water, which have similar
characteristics to stormwater runoff at the site, into a controlled conveyance
system before discharge to a sediment trap or sediment pond.
b. Discharge clean, non-turbid de-watering water, such as well-point ground water,
to systems tributary to, or directly into surface waters of the State, as specified in
8, above, provided the de-watering flow does not cause erosion or flooding of
receiving waters. Do not route clean dewatering water through stormwater
sediment ponds. Note that “surface waters of the State” may exist on a
construction site as well as off site; for example, a creek running through a site.
c. Handle highly turbid or otherwise contaminated dewatering water separately from
stormwater.
d. Other treatment or disposal options may include:
(i) Infiltration
(ii) Transport off-site in vehicle, such as a vacuum flush truck, for legal
disposal in a manner that does not pollute state waters.
(iii) Ecology-approved on-site chemical treatment or other suitable treatment
technologies.
(iv) Sanitary or combined sewer discharge with local sewer district approval, if
there is no other option.
(v) Use of a sedimentation bag that discharges to a ditch or swale for small
volumes of localized dewatering.
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11. Maintain BMPs:
a. Maintain and repair all temporary and permanent erosion and sediment control
BMPs as needed to assure continued performance of their intended function in
accordance with BMP specifications.
b. Remove all temporary erosion and sediment control BMPs within 30 days after
achieving final site stabilization or after the temporary BMPs are no longer
needed.
12. Manage the Project:
a. Phase development projects to the maximum degree practicable and take into
account seasonal work limitations.
b. Inspection and monitoring – Inspect, maintain, and repair all BMPs as needed to
assure continued performance of their intended function.
c. Maintaining an updated construction SWPPP – Maintain, update, and implement
the SWPPP.
d. Projects that disturb one or more acres must have site inspections conducted by a
Certified Erosion and Sediment Control Lead (CESCL). Project sites disturbing
less than one acre may have a CESCL or a person without CESCL certification
conduct inspections. By the initiation of construction, the SWPPP must identify
the CESCL or inspector, who must be present on-site or on-call at all times.
13. Protect Low Impact Development BMPs
a. Protect all Bioretention and Rain Garden BMPs from sedimentation through
installation and maintenance of erosion and sediment control BMPs on portions of
the site that drain into the Bioretention and/or Rain Garden BMPs. Restore the
BMPs to their fully functioning condition if they accumulate sediment during
construction. Restoring the BMP must include removal of sediment and any
sediment-laden Bioretention/rain garden soils, and replacing the removed soils
with soils meeting the design specification.
b. Prevent compacting Bioretention and Rain Garden BMPs by excluding
construction equipment and foot traffic. Protect completed lawn and landscaped
areas from compaction due to construction equipment.
c. Control erosion and avoid introducing sediment from surrounding land uses onto
permeable pavements. Do not allow muddy construction equipment on the base
material or pavement. Do not allow sediment-laden runoff onto permeable
pavements or base materials.
d. Pavements fouled with sediments or no longer passing an initial infiltration test
must be cleaned using procedures from the local stormwater manual or the
manufacturer’s procedures.
e. Keep all heavy equipment off existing soils under LID BMPs that have been
excavated to final grade to retain the infiltration rate of the soils.
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4.3 Minimum Requirement #3: Source Control of Pollution
All known, available and reasonable source control BMPs must be required for all
projects approved by the Permittee. Source control BMPs must be selected, designed, and
maintained in accordance with Volume IV of the Stormwater Management Manual for
Western Washington or an approved equivalent manual approved by Ecology.
4.4 Minimum Requirement #4: Preservation of Natural Drainage Systems and Outfalls
Natural drainage patterns shall be maintained, and discharges from the project site shall
occur at the natural location, to the maximum extent practicable. The manner by which
runoff is discharged from the project site must not cause a significant adverse impact to
downstream receiving waters and down gradient properties. All outfalls require energy
dissipation.
4.5 Minimum Requirement #5: On-site Stormwater Management
Applicability
Except as provided below, the Permittee must require On-site Stormwater Management
BMPs in accordance with the following project thresholds, standards, and lists to
infiltrate, disperse, and retain stormwater runoff on-site to the extent feasible without
causing flooding or erosion impacts.
Projects qualifying as flow control exempt in accordance with Section 4.7 of this
Appendix do not have to achieve the LID performance standard, nor consider
bioretention, rain gardens, permeable pavement, and full dispersion if using List #1 or
List #2. However, those projects must implement BMP T5.13; BMPs T5.10A, B, or C;
and BMP T5.11or T5.12, if feasible.
Project Thresholds
1. Projects triggering only Minimum Requirements #1 through #5 shall either:
a. Use On-site Stormwater Management BMPs from List #1 for all surfaces
within each type of surface in List #1; or
b. Demonstrate compliance with the LID Performance Standard. Projects
selecting this option cannot use Rain Gardens. They may choose to use
Bioretention BMPs as described in the SWMMWW1.
2. Projects triggering Minimum Requirements #1 through #9 must meet the
requirements in Table 4.1
1 All references to the Stormwater Management Manual for Western Washington are to the 2014 amended version.
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Table 4.1: On-site Stormwater Management Requirements for Projects Triggering
Minimum Requirements #1 - #9
Project Type and Location Requirement
New development on any parcel inside the
UGA, or new development outside the
UGA on a parcel less than 5 acres
Low Impact Development Performance
Standard and BMP T5.13; or List #2
(applicant option).
New development outside the UGA on a
parcel of 5 acres or larger
Low Impact Development Performance
Standard and BMP T5.13.
Redevelopment on any parcel inside the
UGA, or redevelopment outside the UGA
on a parcel less than 5 acres
Low Impact Development Performance
Standard and BMP T5.13; or List #2
(applicant option).
Redevelopment outside the UGA on a
parcel of 5 acres or larger
Low Impact Development Performance
Standard and BMP T5.13.
NOTE: This table refers to the Urban Growth Area (UGA) as designated under the
Growth Management Act (GMA) (chapter 36.70A RCW) of the State of Washington. If
the Permittee is located in a county that is not subject to planning under the GMA, the
city limits shall be used instead.
Low Impact Development Performance Standard
Stormwater discharges shall match developed discharge durations to pre-developed
durations for the range of pre-developed discharge rates from 8% of the 2-year peak flow
to 50% of the 2-year peak flow. Refer to the Standard Flow Control Requirement section
in Minimum Requirement #7 for information about the assignment of the pre-developed
condition. Project sites that must also meet minimum requirement #7 shall match flow
durations between 8% of the 2-year flow through the full 50-year flow.
List #1: On-site Stormwater Management BMPs for Projects Triggering Minimum
Requirements #1 through #5
For each surface, consider the BMP’s in the order listed for that type of surface. Use the
first BMP that is considered feasible. No other On-site Stormwater Management BMP is
necessary for that surface. Feasibility shall be determined by evaluation against:
1. Design criteria, limitations, and infeasibility criteria identified for each BMP in
the SWMMWW; and
2. Competing Needs Criteria listed in Chapter 5 of Volume V of the SWMMWW.
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Lawn and landscaped areas:
• Post-Construction Soil Quality and Depth in accordance with BMP T5.13 in
Chapter 5 of Volume V of the SWMMWW
Roofs:
1. Full Dispersion in accordance with BMP T5.30 in Chapter 5 of Volume V of the
SWMMWW, or Downspout Full Infiltration Systems in accordance with BMP
T5.10A in Section 3.1.1 of Volume III of the SWMMWW.
2. Rain Gardens in accordance with BMP T5.14A in Chapter 5 of Volume V, or
Bioretention in accordance with Chapter 7 of Volume V of the SWMMWW. The
rain garden or bioretention facility must have a minimum horizontal projected
surface area below the overflow which is at least 5% of the area draining to it.
3. Downspout Dispersion Systems in accordance with BMP T5.10B in Section 3.1.2
of Volume III of the SWMMWW.
4. Perforated Stub-out Connections in accordance with BMP T5.10C in Section
3.1.3 of Volume III of the SWMMWW.
Other Hard Surfaces:
1. Full Dispersion in accordance with BMP T5.30 in Chapter 5 of Volume V of the
SWMMWW.
2. Permeable pavement 2 in accordance with BMP T5.15 in Chapter 5 of Volume V
of the SWMMWW, or Rain Gardens in accordance with BMP T5.14A in Chapter 5
of Volume V, or Bioretention in accordance with Chapter 7 of Volume V of the
SWMMWW. The rain garden or bioretention facility must have a minimum
horizontal projected surface area below the overflow which is at least 5% of the
area draining to it.
3. Sheet Flow Dispersion in accordance with BMP T5.12, or Concentrated Flow
Dispersion in accordance with BMP T5.11 in Chapter 5 of Volume V of the
SWMMWW.
List #2: On-site Stormwater Management BMPs for Projects Triggering Minimum
Requirements #1 through #9
For each surface, consider the BMPs in the order listed for that type of surface. Use the
first BMP that is considered feasible. No other On-site Stormwater Management BMP is
necessary for that surface. Feasibility shall be determined by evaluation against:
1. Design criteria, limitations, and infeasibility criteria identified for each BMP in
the SWMMWW; and
2. Competing Needs Criteria listed in Chapter 5 of Volume V of the SWMMWW.
2 This is not a requirement to pave these surfaces. Where pavement is proposed, it must be permeable to the extent
feasible unless full dispersion is employed.
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Lawn and landscaped areas:
• Post-Construction Soil Quality and Depth in accordance with BMP T5.13 in
Chapter 5 of Volume V of the SWMMWW
Roofs:
1. Full Dispersion in accordance with BMP T5.30 in Chapter 5 of Volume V of the
SWMMWW, or Downspout Full Infiltration Systems in accordance with BMP
T5.10A in Section 3.1.1 of Volume III of the SWMMWW
2. Bioretention (See Chapter 7 of Volume V of the SWMMWW) facilities that have a
minimum horizontally projected surface area below the overflow which is at least
5% of the of the total surface area draining to it
3. Downspout Dispersion Systems in accordance with BMP T5.10B in Section 3.1.2
of Volume III of the SWMMWW
4. Perforated Stub-out Connections in accordance with BMP T5.10C in Section
3.1.3 of Volume III of the SWMMWW.
Other Hard Surfaces:
1. Full Dispersion in accordance with BMP T5.30 in Chapter 5 of Volume V of the
SWMMWW
2. Permeable pavement2 in accordance with BMP T5.15 in Chapter 5 of Volume V
of the SWMMWW
3. Bioretention (See Chapter 7, Volume V of the S WMMWW) facilities that have a
minimum horizontally projected surface area below the overflow which is at least
5% of the total surface area draining to it.
4. Sheet Flow Dispersion in accordance with BMP T5.12, or Concentrated Flow
Dispersion in accordance with BMP T5.11 in Chapter 5 of Volume V of the
SWMMWW
4.6 Minimum Requirement #6: Runoff Treatment
Project Thresholds
When assessing a project against the following thresholds, only consider those hard
and pervious surfaces that are subject to this minimum requirement as determined in
Section 3 of this Appendix.
The following require construction of stormwater treatment facilities:
• Projects in which the total of pollution-generating hard surface (PGHS) is 5,000
square feet or more in a threshold discharge area of the project, or
• Projects in which the total of pollution-generating pervious surfaces (PGPS) – not
including permeable pavements - is three-quarters (3/4) of an acre or more in a
threshold discharge area, and from which there will be a surface discharge in a
natural or man-made conveyance system from the site.
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Treatment-Type Thresholds
1. Oil Control:
Treatment to achieve Oil Control applies to projects that have “high-use sites.”
High-use sites are those that typically generate high concentrations of oil due to
high traffic turnover or the frequent transfer of oil. High-use sites include:
a. An area of a commercial or industrial site subject to an expected average
daily traffic (ADT) count equal to or greater than 100 vehicles per 1,000
square feet of gross building area;
b. An area of a commercial or industrial site subject to petroleum storage and
transfer in excess of 1,500 gallons per year, not including routinely delivered
heating oil;
c. An area of a commercial or industrial site subject to parking, storage or
maintenance of 25 or more vehicles that are over 10 tons gross weight
(trucks, buses, trains, heavy equipment, etc.);
d. A road intersection with a measured ADT count of 25,000 vehicles or more
on the main roadway and 15,000 vehicles or more on any intersecting
roadway, excluding projects proposing primarily pedestrian or bicycle use
improvements.
2. Phosphorus Treatment:
The requirement to provide phosphorous control is determined by the local
government with jurisdiction (e.g., through a lake management plan), or the
Department of Ecology (e.g., through a waste load allocation). The local
government may have developed a management plan and implementing
ordinances or regulations for control of phosphorus from new/redevelopment for
the receiving water(s) of the stormwater drainage. The local government can use
the following sources of information for pursuing plans and implementing
ordinances and/or regulations:
a. Those waterbodies reported under section 305(b) of the Clean Water Act, and
designated as not supporting beneficial uses due to phosphorous;
b. Those listed in Washington State's Nonpoint Source Assessment required
under section 319(a) of the Clean Water Act due to nutrients.
3. Enhanced Treatment:
Except where specified below under “4. Basic Treatment”, Enhanced treatment
for reduction in dissolved metals is required for the following project sites that: 1)
discharge directly to fresh waters or conveyance systems tributary to fresh waters
designated for aquatic life use or that have an existing aquatic life use; or 2) use
infiltration strictly for flow control – not treatment – and the discharge is within ¼
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mile of a fresh water designated for aquatic life use or that has an existing aquatic
life use:
Industrial project sites,
Commercial project sites,
Multi-family project sites, and
High AADT roads as follows:
Within Urban Growth Management Areas:
• Fully controlled and partially controlled limited access highways with
Annual Average Daily Traffic (AADT) counts of 15,000 or more
• All other roads with an AADT of 7,500 or greater
Outside of Urban Growth Management Areas:
• Roads with an AADT of 15,000 or greater unless discharging to a 4th
Strahler order stream or larger;
• Roads with an AADT of 30,000 or greater if discharging to a 4th Strahler
order stream or larger (as determined using 1:24,000 scale maps to
delineate stream order).
Any areas of the above-listed project sites that are identified as subject to Basic
Treatment requirements (below), are not also subject to Enhanced Treatment
requirements. For developments with a mix of land use types, the Enhanced
Treatment requirement shall apply when the runoff from the areas subject to the
Enhanced Treatment requirement comprise 50% or more of the total runoff within
a threshold discharge area.
4. Basic Treatment:
Basic Treatment is required in the following circumstances:
• Project sites that discharge to the ground, UNLESS:
1) The soil suitability criteria for infiltration treatment are met (See
Chapter 3, Volume III of the SWMMWW), and alternative pretreatment
is provided (see Chapter 6, Volume V of the SWMMWW); or
2) The project site uses infiltration strictly for flow control – not treatment
- and the discharge is within ¼-mile of a phosphorus sensitive lake
(use a Phosphorus Treatment facility), or
3) The project site is industrial, commercial, multi-family residential, or a
high AADT road (consistent with the Enhanced Treatment-type
thresholds listed above) and is within ¼ mile of a fresh water
designated for aquatic life use or that has an existing aquatic life
use.(use an Enhanced Treatment facility).
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• Residential projects not otherwise needing phosphorus control as
designated by USEPA, the Department of Ecology, or by the Permittee;
• Project sites discharging directly (or indirectly through a municipal
separate storm sewer system) to Basic Treatment Receiving Waters
(Appendix I-C of the SWMMWW);
• Project sites that drain to fresh water that is not designated for aquatic life
use, and does not have an existing aquatic life use; and project sites that
drain to waters not tributary to waters designated for aquatic life use or
that have an existing aquatic life use;
• Landscaped areas of industrial, commercial, and multi-family project sites,
and parking lots of industrial and commercial project sites that do not
involve pollution-generating sources (e.g., industrial activities, customer
parking, storage of erodible or leachable material, wastes or chemicals)
other than parking of employees’ private vehicles. For developments with
a mix of land use types, the Basic Treatment requirement shall apply when
the runoff from the areas subject to the Basic Treatment requirement
comprise 50% or more of the total runoff within a threshold discharge
area.
Treatment Facility Sizing
Size stormwater treatment facilities for the entire area that drains to them, even if some of
those areas are not pollution-generating, or were not included in the project site threshold
decisions (Section 3 of this appendix) or the treatment threshold decisions of this
minimum requirement.
Water Quality Design Storm Volume: The volume of runoff predicted from a 24-hour
storm with a 6-month return frequency (a.k.a., 6-month, 24-hour storm). Wetpool
facilities are sized based upon the volume of runoff predicted through use of the Natural
Resource Conservation Service curve number equations in Chapter 2 of Volume III of the
SWMMWW), for the 6-month, 24-hour storm. Alternatively, when using an approved
continuous runoff model, the water quality design storm volume shall be equal to the
simulated daily volume that represents the upper limit of the range of daily volumes that
accounts for 91% of the entire runoff volume over a multi-decade period of record.
Water Quality Design Flow Rate
1. Preceding Detention Facilities or when Detention Facilities are not required:
The flow rate at or below which 91% of the runoff volume, as estimated by an
approved continuous runoff model, will be treated. Design criteria for treatment
facilities are assigned to achieve the applicable performance goal (e.g., 80% TSS
removal) at the water quality design flow rate. At a minimum, 91% of the total
runoff volume, as estimated by an approved continuous runoff model, must pass
through the treatment facility(ies) at or below the approved hydraulic loading rate
for the facility(ies).
Western Washington Phase II Municipal Stormwater Permit
______________________________________________________________________________
August 1, 2013, Modified January 16, 2015 Appendix 1- Minimum Technical Requirements
Page 27 of 32
2. Downstream of Detention Facilities:
The water quality design flow rate must be the full 2-year release rate from the
detention facility.
Treatment Facility Selection, Design, and Maintenance
Stormwater treatment facilities shall be:
• Selected in accordance with the process identified in Chapter 4 of Volume I, and
Chapter 2 of Volume V of the SWMMWW,
• Designed in accordance with the design criteria in Volume V of the SWMMWW,
and
• Maintained in accordance with the maintenance schedule in Volume V of the
SWMMWW.
Additional Requirements
The discharge of untreated stormwater from pollution-generating hard surfaces to ground
water must not be authorized by the Permittee, except for the discharge achieved by
infiltration or dispersion of runoff through use of On-site Stormwater Management
BMPs in accordance with Chapter 5, Volume V and Chapter 7, Volume V of the
SWMMWW; or by infiltration through soils meeting the soil suitability criteria in Chapter
3 of Volume III of the SWMMWW.
4.7 Minimum Requirement #7: Flow Control
Applicability
Except as provided below, the Permittee must require all projects provide flow control to
reduce the impacts of stormwater runoff from hard surfaces and land cover conversions.
The requirement below applies to projects that discharge stormwater directly, or
indirectly through a conveyance system, into a fresh water body.
Flow control is not required for projects that discharge directly to, or indirectly through
an MS4 to a water listed in Appendix I-E of the SWMMWW subject to the following
restrictions:
• Direct discharge to the exempt receiving water does not result in the diversion of
drainage from any perennial stream classified as Types 1, 2, 3, or 4 in the State of
Washington Interim Water Typing System, or Types “S”, “F”, or “Np” in the
Permanent Water Typing System, or from any category I, II, or III wetland; and
• Flow splitting devices or drainage BMP’s are applied to route natural runoff volumes
from the project site to any downstream Type 5 stream or category IV wetland:
o Design of flow splitting devices or drainage BMP’s will be based on
continuous hydrologic modeling analysis. The design will assure that flows
Western Washington Phase II Municipal Stormwater Permit
______________________________________________________________________________
August 1, 2013, Modified January 16, 2015 Appendix 1- Minimum Technical Requirements
Page 28 of 32
delivered to Type 5 stream reaches will approximate, but in no case exceed,
durations ranging from 50% of the 2-year to the 50-year peak flow.
o Flow splitting devices or drainage BMP’s that deliver flow to category IV
wetlands will also be designed using continuous hydrologic modeling to
preserve pre-project wetland hydrologic conditions unless specifically waived
or exempted by regulatory agencies with permitting jurisdiction; and
• The project site must be drained by a conveyance system that is comprised entirely of
manmade conveyance elements (e.g., pipes, ditches, outfall protection) and extends to
the ordinary high water line of the exempt receiving water; and
• The conveyance system between the project site and the exempt receiving water shall
have sufficient hydraulic capacity to convey discharges from future build-out
conditions (under current zoning) of the site, and the existing condition from non-
project areas from which runoff is or will be collected; and
• Any erodible elements of the manmade conveyance system must be adequately
stabilized to prevent erosion under the conditions noted above.
If the discharge is to a stream that leads to a wetland, or to a wetland that has an outflow
to a stream, both this minimum requirement (Minimum Requirement #7) and Minimum
Requirement #8 apply.
Permittees may petition Ecology to exempt projects in additional areas. A petition must
justify the proposed exemption based upon a hydrologic analysis that demonstrates that
the potential stormwater runoff from the exempted area will not significantly increase the
erosion forces on the stream channel nor have near-field impacts.
Thresholds
When assessing a project against the following thresholds, consider only those
impervious, hard, and pervious surfaces that are subject to this minimum requirement as
determined in Section 3 of this Appendix.
The following circumstances require achievement of the standard flow control
requirement for western Washington:
• Projects in which the total of effective impervious surfaces is 10,000 square feet or
more in a threshold discharge area, or
• Projects that convert ¾ acres or more of vegetation to lawn or landscape, or convert
2.5 acres or more of native vegetation to pasture in a threshold discharge area, and
from which there is a surface discharge in a natural or man-made conveyance system
from the site, or
• Projects that through a combination of hard surfaces and converted vegetation areas
cause a 0.10 cubic feet per second (cfs) increase or greater in the 100-year flow
frequency from a threshold discharge area as estimated using the Western
Western Washington Phase II Municipal Stormwater Permit
______________________________________________________________________________
August 1, 2013, Modified January 16, 2015 Appendix 1- Minimum Technical Requirements
Page 29 of 32
Washington Hydrology Model or other approved model and one-hour time steps (or a
0.15 cfs increase or greater using 15-minute time steps).3
Standard Flow Control Requirement
Stormwater discharges shall match developed discharge durations to pre-developed
durations for the range of pre-developed discharge rates from 50% of the 2-year peak
flow up to the full 50-year peak flow. The pre-developed condition to be matched shall be
a forested land cover unless:
• Reasonable, historic information is available that indicates the site was prairie prior to
settlement (modeled as “pasture” in the Western Washington Hydrology Model); or
• The drainage area of the immediate stream and all subsequent downstream basins
have had at least 40% total impervious area since 1985. In this case, the pre-
developed condition to be matched shall be the existing land cover condition. The
map in Appendix I-G of the SWMMWW depicts those areas which meet this
criterion. Where basin-specific studies determine a stream channel to be unstable,
even though the above criterion is met, the pre-developed condition assumption shall
be the “historic” land cover condition, or a land cover condition commensurate with
achieving a target flow regime identified by an approved basin study.
This standard requirement is waived for sites that will reliably infiltrate all the runoff
from hard surfaces and converted vegetation areas.
Western Washington Alternative Requirement
An alternative requirement may be established through application of watershed-scale
hydrological modeling and supporting field observations. Possible reasons for an
alternative flow control requirement include:
• Establishment of a stream–specific threshold of significant bedload movement other
than the assumed 50% of the 2-year peak flow;
• Zoning and Land Clearing Ordinance restrictions that, in combination with an
alternative flow control standard, maintain or reduce the naturally occurring erosive
forces on the stream channel; or
• A duration control standard is not necessary for protection, maintenance, or
restoration of designated and existing beneficial uses or Clean Water Act compliance.
See Section 7 Basin/Watershed Planning of this Appendix for details on how alternative
flow control requirements may be established.
3 The 0.10 cfs (one-hour time steps) or 0.15 cfs (15-minute time steps) increase should be a comparison of the post-
project runoff to the existing condition runoff. For the purpose of applying this threshold, the existing condition is
either the pre-project land cover, or the land cover that existed at the site as of a date when the local jurisdiction first
adopted flow control requirements into code or rules.
Western Washington Phase II Municipal Stormwater Permit
______________________________________________________________________________
August 1, 2013, Modified January 16, 2015 Appendix 1- Minimum Technical Requirements
Page 30 of 32
Additional Requirement
Flow Control BMPs shall be selected, designed, and maintained in accordance with
Volume III of the SWMMWW or an approved equivalent.
4.8 Minimum Requirement #8: Wetlands Protection
Applicability
The requirements below apply only to projects whose stormwater discharges into a
wetland, either directly or indirectly through a conveyance system.
Thresholds
The thresholds identified in Minimum Requirement #6 – Runoff Treatment, and
Minimum Requirement #7 – Flow Control shall also be applied to determine the
applicability of this requirement to discharges to wetlands.
Standard Requirement
Projects shall comply with Guide Sheets #1 through #3 in Appendix I-D of the
SWMMWW. The hydrologic analysis shall use the existing land cover condition to
determine the existing hydrologic conditions unless directed otherwise by a regulatory
agency with jurisdiction.
Additional Requirements
Stormwater treatment and flow control facilities shall not be built within a natural
vegetated buffer, except for:
• Necessary conveyance systems as approved by the Permittee; or
• As allowed in wetlands approved for hydrologic modification and/or treatment in
accordance with Guide Sheet 2 in Appendix I-D of the SWMMWW.
An adopted and implemented basin plan prepared in accordance with the provisions of
Section 7 of this Appendix may be used to develop requirements for wetlands that are
tailored to a specific basin.
4.9 Minimum Requirement #9: Operation and Maintenance
Permittees must require an operation and maintenance manual that is consistent with the
provisions in Volume V of the SWMMWW for proposed stormwater facilities and BMPs.
The party (or parties) responsible for maintenance and operation shall be identified in the
operation and maintenance manual. For private facilities approved by the Permittee, a
copy of the operation and maintenance manual shall be retained on-site or within
reasonable access to the site, and shall be transferred with the property to the new owner.
For public facilities, a copy of the operation and maintenance manual shall be retained in
the appropriate department. A log of maintenance activity that indicates what actions
were taken shall be kept and be available for inspection by the local government.
Western Washington Phase II Municipal Stormwater Permit
______________________________________________________________________________
August 1, 2013, Modified January 16, 2015 Appendix 1- Minimum Technical Requirements
Page 31 of 32
Section 5. Adjustments
Adjustments to the Minimum Requirements may be granted by the Permittee provided that a
written finding of fact is prepared, that addresses the following:
• The adjustment provides substantially equivalent environmental protection.
• Based on sound Engineering practices, the objectives of safety, function,
environmental protection and facility maintenance, are met.
Section 6. Exceptions/Variances
Exceptions/variances (exceptions) to the Minimum Requirements may be granted by the
Permittee following legal public notice of an application for an exception or variance, legal
public notice of the Permittee’s decision on the application, and written findings of fact that
documents the Permittees determination to grant an exception. Permittees shall keep records,
including the written findings of fact, of all local exceptions to the Minimum Requirements.
Project-specific design exceptions based on site-specific conditions do not require prior approval
of Ecology. The Permittee must seek prior approval by Ecology for any jurisdiction-wide
exception.
The Permittee may grant an exception to the minimum requirements if such application imposes
a severe and unexpected economic hardship. To determine whether the application imposes a
severe and unexpected economic hardship on the project applicant, the Permittee must consider
and document with written findings of fact the following:
• The current (pre-project) use of the site, and
• How the application of the minimum requirement(s) restricts the proposed use of
the site compared to the restrictions that existed prior to the adoption of the
minimum requirements; and
• The possible remaining uses of the site if the exception were not granted; and
• The uses of the site that would have been allowed prior to the adoption of the
minimum requirements; and
• A comparison of the estimated amount and percentage of value loss as a result of
the minimum requirements versus the estimated amount and percentage of value
loss as a result of requirements that existed prior to adoption of the minimum
requirements; and
• The feasibility for the owner to alter the project to apply the minimum
requirements.
In addition any exception must meet the following criteria:
• The exception will not increase risk to the public health and welfare, nor be
injurious to other properties in the vicinity and/or downstream, and to the quality
of waters of the state; and
• The exception is the least possible exception that could be granted to comply with
the intent of the Minimum Requirements.
Western Washington Phase II Municipal Stormwater Permit
______________________________________________________________________________
August 1, 2013, Modified January 16, 2015 Appendix 1- Minimum Technical Requirements
Page 32 of 32
Section 7. Basin/Watershed Planning
Basin/Watershed planning may be used by the Permittee to tailor Minimum Requirement #5
On-site Stormwater Management, Minimum Requirement #6 Runoff Treatment, Minimum
Requirement #7 Flow Control, and/or Minimum Requirement #8 Wetlands Protection. Basin
planning may also be used to demonstrate an equivalent level of treatment, flow control, and/or
wetland protection through the construction and use of regional stormwater facilities.
Basin planning provides a mechanism by which the minimum requirements and implementing
BMP’s can be evaluated and refined based on an analysis of a basin or watershed. Basin plans
may be used to develop control strategies to address impacts from future development and to
correct specific problems whose sources are known or suspected. Basin plans can be effective at
addressing both long-term cumulative impacts of pollutant loads and short-term acute impacts of
pollutant concentrations, as well as hydrologic impacts to streams, wetlands, and ground water
resources.
Basin planning will require the use of continuous runoff computer models and field work to
verify and support the models. Permittees who are considering the use of basin/watershed plans
to modify or tailor one or more of the minimum requirements are encouraged to contact Ecology
early in the planning stage.
Some examples of how Basin Planning can alter the minimum requirements are given in
Appendix I-A from the SWMMWW.
In order for a basin plan to serve as a means of modifying the minimum requirements the
following conditions must be met:
• The plan must be formally adopted by all jurisdictions with responsibilities under
the plan; and
• All ordinances or regulations called for by the plan must be in effect; and
• The basin plan must be reviewed and approved by Ecology.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 1
APPENDIX 2 – Total Maximum Daily Load (TMDL)
Requirements
Additional permit requirements are based on applicable TMDLs in accordance with Special
Condition S7 Compliance with Total Maximum Daily Load Requirements.
1. WRIA 1 - Nooksack River Watershed Bacteria Page 2
4. WRIA 5 – Stillaguamish River Page 3
5. WRIA 7 – Snohomish River Tributaries Page 5
6. WRIA 8 – North Creek Page 7
7. WRIA 8 - Swamp Creek Page 9
8. WRIA 8 - Bear-Evans Creek Page 11
9. WRIA 8 – Cottage Lake Page 12
10. WRIA 8 – Issaquah Creek Basin Page 12
11. WRIA 8 – Little Bear Creek Page 13
12. WRIA 10 – Puyallup River Page 15
11. WRIA 10 Clarks Creek (Fecal Coliform) Page 17
13. WRIA 10 - South Prairie Creek Page 18
14. WRIA 11 – Nisqually River Page 19
15. WRIA 13 – Henderson Inlet Watershed Page 20
16. WRIA 15 – Sinclair-Dyes Inlet Page 23
18. WRIA 22 – Grays Harbor/Chehalis River Page 26
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 2
Name of TMDL Nooksack River Watershed Bacteria TMDL
Document(s) for
TMDL
Nooksack River Watershed Bacteria Total Maximum Daily Load, June
2000. Ecology Publication No. 00-10-036
Nooksack River Watershed Bacteria Total Maximum Daily Load
Detailed
Implementation Plan, January 2002. Ecology Publication No. 01-10-060
http://www.ecy.wa.gov/programs/wq/tmdl/TMDLsbyWria/TMDLbyWria.html
Location of
Original 303(d)
Listings
WA-01-1010, WA-01-1012, WA-01-1014, WA-01-1015, WA-01-1016,
WA-01-1110, WA-01-1111, WA-01-1115, WA-01-1116, WA-01-1117,
WA-01-1118, WA-01-1119, WA-01-1120, WA-01-1125, AR42TO,
BX84LO, UZ70KA, LLPL
Area Where
TMDL
Requirements
Apply
TMDL coverage includes areas served by an MS4 draining to the
Nooksack River and its tributaries, Fishtrap Creek, Bertrand Creek,
Double Ditch drain, Duffner Ditch, Bender road ditch, between Nugents
Corner and Marine Drive.
Parameter(s) Fecal Coliform.
EPA Approval
Date
August 8, 2000
MS4 Permittee: Phase II Permit: City of Ferndale WAR04-5552
Phase II Permit: City of Lynden
Actions Required
City of Ferndale
Continue bacteria sampling under Ecology-approved Stormwater Quality Monitoring for Fecal
Coliform bacteria QAPP dated 6/19/2009.
• Once the City of Ferndale reduces fecal coliform bacteria below state water quality
standards in the current outfall sampling area, the City of Ferndale should designate a
new representative area for continued fecal coliform sampling at MS4 outfalls.
• With each annual report, the City of Ferndale shall submit an up to date Stormwater
Capital Improvement plan to address existing deficiencies in the stormwater treatment
and conveyance system.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 3
City of Lynden
The City of Lynden shall designate a high priority area discharging to its MS4 system for fecal
coliform sampling at a representative outfall location, and submit a Stormwater Capital
Improvement Plan with each annual report.
• City of Lynden shall designate a high priority sampling location from an MS4 outfall.
• City of Lynden shall submit a fecal coliform Quality Assurance Project Plan (QAPP) to
Ecology for review and approval by December 1, 2013. Monitoring shall be ongoing
from March 2014 to the end of the permit term.
• With each annual report, City of Lynden shall submit the monitoring results and an up to
date Stormwater Capital Improvement Plan to address existing deficiencies in the
stormwater treatment and conveyance system.
Name of TMDL Stillaguamish River
EPA Approved
Document(s) for
TMDL
Stillaguamish River Watershed Fecal Coliform, Dissolved Oxygen, pH,
Arsenic, and Mercury Total Maximum Daily Load (Water Cleanup Plan) -
Submittal Report, May 2005, Ecology Publication No. 05-10-044.
http://www.ecy.wa.gov/biblio/0510044.html
Stillaguamish River Watershed Fecal Coliform, Dissolved Oxygen, pH,
Arsenic, and Mercury Total Maximum Daily Load (Water Cleanup Plan) -
Water Quality Implementation Plan, June 2007, Ecology Publication No.
07-10-033. http://www.ecy.wa.gov/biblio/0710033.html
Location of
Original 303(d)
Listings
QJ28UC, HD76OJ, JU33JU, GH05SX, IJ55EP, VJ74AO, 390KRD,
OT80TY, QE93BW, ZO73WL, WO38NV, SN06ZT, LU17DC
Area Where
TMDL
Requirements
Apply
Requirements apply in all areas regulated under the Permittees’ municipal
stormwater permit and draining to fresh or marine waters within Water
Resource Inventory Area (WRIA) 5
Parameter Fecal Coliform, Dissolved Oxygen
EPA Approval
Date
June 21, 2005
MS4 Permittee Phase I Permit: Snohomish County
Phase II Permit: Arlington
Actions Required
Business Inspections: Each Permittee shall inspect commercial animal handling areas and
commercial composting facilities to ensure implementation of source control BMPs for bacteria.
Commercial animal handling areas are associated with Standard Industrial Code (SIC) 074 and
075 and include veterinary and pet care/boarding services, animal slaughtering, and support
activities for animal production. Facilities where the degradation and transformation of organic
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 4
solid waste takes place under controlled conditions designed to promote aerobic decomposition
are considered composting facilities (definition in accordance with Chapter 173-350 WAC). All
qualifying facilities shall be inspected by August 1, 2016 Permittees shall implement an ongoing
inspection program to re-inspect facilities with bacteria source control problems a minimum of
every three years.
Public Education and Outreach: Each Permittee shall conduct public education and outreach
activities to increase awareness of bacterial pollution problems and promote proper pet waste
management behavior.
Operations & Maintenance: Each Permittee shall install and maintain animal waste collection
and/or education stations at municipal parks and other Permittee owned and operated lands
reasonably expected to have substantial domestic animal (dog and horse) use and the potential
for pollution of stormwater.
IDDE Field Screening: Each Permittee shall conduct illicit discharge detection and elimination
(IDDE) field screening for bacteria sources in MS4 subbasins which discharge to surface waters
in the area where these TMDL requirements apply. Phase II cities shall screen 100% of these
MS4 subbasins by the expiration date of the permit. Snohomish County shall screen 50% of rural
MS4 basins in the TMDL area by the expiration date of the permit unless the option to combine
this requirement with the surface water monitoring requirement is selected below. Permittees
shall implement the schedules and activities identified in S5.C.8 of the Phase I permit or S5.C.3
of the Western Washington Phase II permit in response to any illicit discharges found.
Surface Water Monitoring: Each Permittee shall select surface water monitoring location(s) as
appropriate for characterization and long term trends evaluation of fecal coliform. Each
Permittee shall submit a draft QAPP to Ecology for review and approval, no later than February
2, 2015. If Ecology does not request changes within 60 days, the draft QAPP is considered
approved. At a minimum, the monitoring program shall:
• Begin by August 1, 2015.
• Collect 12 samples in at least one location per calendar year.
• Submit available data to the Environmental Information Management (EIM) database by
May 31 of each year.
• Provide a data summaries and narrative evaluation of the data in each annual report’s
TMDL summary.
• Be documented in a QAPP which follows Guidelines for Preparing Quality Assurance
Project Plans for Environmental Studies, July 2004, Ecology Publication No. 04-03-030
Permittees shall follow Ecology-approved QAPPs unless changes are approved by Ecology.
Permittees subject to multiple TMDL monitoring requirements may conduct an integrated
monitoring program in accordance with an Ecology-approved QAPP. Snohomish County may
combine the targeted IDDE field screening requirement, above, with the surface water
monitoring requirement as documented in the County’s microbial water quality assessment
(MWQA), or similar, program per an Ecology-approved QAPP.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 5
Name of TMDL Snohomish River Tributaries
EPA Approved
Document(s) for
TMDL
Water Quality Assessment of Tributaries to the Snohomish River and
Nonpoint Source Pollution TMDL, September 1997, Ecology Publication
No. 97-334. www.ecy.wa.gov/biblio/97334.html
Snohomish River Tributaries Fecal Coliform Total Maximum Daily Load
Submittal Report, June 2001, Ecology publication No. 00-10-087.
www.ecy.wa.gov/biblio/0010087.html
Lower Snohomish River Tributaries Fecal Coliform Bacterial Total
Maximum Daily Load: Detailed Implementation Plan, June 2003,
Ecology Publication No. 03-10-031.
www.ecy.wa.gov//biblio/0310031.html
Location of
Original 303(d)
Listings
WA-07-1012, WA-07-015, WA-07-1052, WA-07-1163WA-07-1163,
WA-07-1030 and WA-07-040
Area Where
TMDL
Requirements
Apply
Requirements apply in all areas regulated under the Permittees’
municipal stormwater permit and draining to the WASWIS segment
number, and all upstream tributaries within the jurisdiction of the
Permittee and within the geographic area covered by this permit
contributing to waterbodies: Allen Creek, YT94RF: Quilceda Creek,
TH58TS: French Creek, XZ24XU: Woods Creek, FZ74HO: Pilchuck
River, NF79WA: Marshland Watershed, XW79FQ.
Parameter Fecal Coliform
EPA Approval
Date
August 9, 2001
MS4 Permittee Phase I Permit: Snohomish County
Phase II Permit: Granite Falls, Lake Stevens, Monroe, Snohomish,
Marysville, Arlington, Everett
Actions Required
Business Inspections: Each Permittee shall inspect commercial animal handling areas and
commercial composting facilities to ensure implementation of source control BMPs for bacteria.
Commercial animal handling areas are associated with Standard Industrial Code (SIC) 074 and
075 and include veterinary and pet care/boarding services, animal slaughtering, and support
activities for animal production. Facilities where the degradation and transformation of organic
solid waste takes place under controlled conditions designed to promote aerobic decomposition
are considered composting facilities (definition in accordance with Chapter 173-350 WAC). All
qualifying facilities shall be inspected by August 1, 2016. Permittees shall implement an ongoing
inspection program to re-inspect facilities with bacteria source control problems a minimum of
every three years.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 6
Public Education and Outreach: Each Permittee shall conduct public education and outreach
activities to increase awareness of bacterial pollution problems and promote proper pet waste
management behavior.
Operations & Maintenance: Each Permittee shall install and maintain animal waste collection
and/or education stations at municipal parks and other Permittee owned and operated lands
reasonably expected to have substantial domestic animal (dog and horse) use and the potential
for pollution of stormwater.
IDDE: Permittees conducting IDDE-related field screening under S5.C.8 of the Phase I permit
or S5.C.3 of the Western Washington Phase II permit shall screen for bacteria sources in any
screened MS4 subbasins which discharge to surface waters in the TMDL area.
Targeted Source Identification & Elimination: By February 2, 2014, each Permittee shall
review the fecal coliform data collected per approved QAPPs under the 2007 Permit. The
purpose of this review is to identify a minimum of one high priority area (such as a tributary or a
stream segment) that will be the focus of source identification and elimination efforts during this
permit cycle. Each Permittee shall prepare written documentation of this review and the
identified high priority area; documentation shall be submitted with the Annual Report for 2014.
Permittees shall begin to implement source identification and elimination efforts in the MS4
subbasins discharging to the identified high priority area no later than August 1, 2014. Permittees
are encouraged to address potential bacteria pollution sources not associated with the MS4.
Stormwater quality sampling for bacteria sources is required as part of this focused source
identification and elimination effort. Permittees shall implement the schedules and activities
identified in S5.C.8 of the Phase I permit or S5.C.3 of the Western Washington Phase II permit
in response to any illicit discharges found. Each annual report’s TMDL summary shall include
qualitative and quantitative information about the source identification and elimination activities,
including procedures followed and sampling results, implemented in the selected high priority
area(s).
Surface Water Monitoring: Each Permittee shall review the fecal coliform data collected per
approved QAPPs under the 2007 Permit and select surface water monitoring location(s) as
appropriate for continued characterization and long term trends evaluation of fecal coliform.
Each Permittee shall submit a draft revised QAPP to Ecology for review and approval, no later
than February 2, 2015. If Ecology does not request changes within 60 days, the draft QAPP is
considered approved. At a minimum, the monitoring program shall:
• Begin by August 1, 2015.
• Collect 12 samples in at least one location per calendar year.
• Submit available data to the Environmental Information Management (EIM) database by
May 31 of each year.
• Provide data summaries and narrative evaluation of the data in each annual report’s
TMDL summary.
• Be documented in a QAPP which follows Guidelines for Preparing Quality Assurance
Project Plans for Environmental Studies, July 2004, Ecology Publication No. 04-03-030.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 7
Permittees shall follow Ecology-approved QAPPs unless changes are approved by Ecology.
Permittees subject to multiple TMDL monitoring requirements may conduct an integrated
monitoring program in accordance with an Ecology-approved QAPP. Snohomish County may
combine the high priority area source identification and elimination requirement with the surface
water monitoring requirement as documented in the County’s microbial water quality assessment
(MWQA), or similar, program per an Ecology-approved QAPP.
Name of TMDL North Creek
EPA Approved
Document(s) for
TMDL
North Creek Watershed: Total Maximum Daily Load Evaluation for Fecal
Coliform Bacteria, June 2001, Ecology Publication No. 01-03-020.
http://www.ecy.wa.gov/biblio/0103020.html
North Creek Fecal Coliform Total Maximum Daily Load Submittal Report,
June 2002, Ecology publication No. 02-10-020.
http://www.ecy.wa.gov/biblio/0210020.html
North Creek Fecal Coliform Bacteria Total Maximum Daily Load: Detailed
Implementation Plan, October 2003, Ecology Publication No. 03-10-047.
http://www.ecy.wa.gov/biblio/0310047.html
Location of
Original 303(d)
Listings
WA-08-1065
Area Where
TMDL
Requirements
Apply
Requirements apply in all areas regulated under the Permittees’ municipal
stormwater permit and draining to the portion of the WASWIS segment
SM74QQ starting at the confluence with the Sammamish River and
including all upstream tributaries contributing to the North Creek segment
of WASWIS SM74QQ.
Parameter Fecal Coliform
EPA Approval
Date
August 2, 2002
MS4 Permittee Phase I Permit: Snohomish County
Phase II Permit: Everett, Bothell, Mill Creek
Actions Required
Business Inspections: Each Permittee shall inspect commercial animal handling areas and
commercial composting facilities to ensure implementation of source control BMPs for bacteria.
Commercial animal handling areas are associated with Standard Industrial Code (SIC) 074 and
075 and include veterinary and pet care/boarding services, animal slaughtering, and support
activities for animal production. Facilities where the degradation and transformation of organic
solid waste takes place under controlled conditions designed to promote aerobic decomposition
are considered composting facilities (definition in accordance with Chapter 173-350 WAC). All
qualifying facilities shall be inspected by August 1, 2016. Permittees shall implement an ongoing
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 8
inspection program to re-inspect facilities with bacteria source control problems a minimum of
every three years.
Public Education and Outreach: Each Permittee shall conduct public education and outreach
activities to increase awareness of bacterial pollution problems and promote proper pet waste
management behavior.
Operations & Maintenance: Each Permittee shall install and maintain animal waste collection
and/or education stations at municipal parks and other Permittee owned and operated lands
reasonably expected to have substantial domestic animal (dog and horse) use and the potential
for pollution of stormwater.
IDDE: Permittees conducting IDDE-related field screening under S5.C.8 of the Phase I permit or
S5.C.3 of the Western Washington Phase II permit shall screen for bacteria sources in any
screened MS4 subbasins which discharge to surface waters in the TMDL area.
Targeted Source Identification & Elimination: By February 2, 2014, each Permittee shall
review the fecal coliform data collected per approved QAPPs under the 2007 Permit. The
purpose of this review is to identify a minimum of one high priority area (such as a tributary or a
stream segment) that will be the focus of source identification and elimination efforts during this
permit cycle. Each Permittee shall prepare written documentation of this review and the
identified high priority area; documentation shall be submitted with the Annual Report for 2014.
Permittees shall begin to implement source identification and elimination efforts in the MS4
subbasins discharging to the identified high priority area no later than August 1, 2014. Permittees
are encouraged to address potential bacteria pollution sources not associated with the MS4.
Stormwater quality sampling for bacteria sources is required as part of this focused source
identification and elimination effort. Permittees shall implement the schedules and activities
identified in S5.C.8 of the Phase I permit or S5.C.3 of the Western Washington Phase II permit
in response to any illicit discharges found. Each annual report’s TMDL summary shall include
qualitative and quantitative information about the source identification and elimination activities,
including procedures followed and sampling results, implemented in the selected high priority
area(s).
Surface Water Monitoring: Each Permittee shall review the fecal coliform data collected per
approved QAPPs under the 2007 Permit and select surface water monitoring location(s) as
appropriate for continued characterization and long term trends evaluation of fecal coliform.
Each Permittee shall submit a draft revised QAPP to Ecology for review and approval, no later
than February 2, 2015. If Ecology does not request changes within 60 days, the draft QAPP is
considered approved. At a minimum, the monitoring program shall:
• Begin by August 1, 2015.
• Collect 12 samples in at least one location per calendar year.
• Submit available data to the Environmental Information Management (EIM) database by
May 31 of each year.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 9
• Provide data summaries and narrative evaluation of the data in each annual report’s
TMDL summary.
• Be documented in a QAPP which follows Guidelines for Preparing Quality Assurance
Project Plans for Environmental Studies, July 2004, Ecology Publication No. 04-03-030.
Permittees shall follow Ecology-approved QAPPs unless changes are approved by Ecology.
Permittees subject to multiple TMDL monitoring requirements may conduct an integrated
monitoring program in accordance with an Ecology-approved QAPP. Snohomish County may
combine the high priority area source identification and elimination requirement with the surface
water monitoring requirement as documented in the County’s microbial water quality assessment
(MWQA), or similar, program per an Ecology-approved QAPP.
Name of TMDL Swamp Creek
EPA Approved
Document(s) for
TMDL
Swamp Creek Fecal Coliform Bacteria Total Maximum Daily Load: Water
Quality Improvement Report and Implementation Plan, June 2006, Ecology
Publication No. 06-10-021. http://www.ecy.wa.gov/biblio/0610021.html
Location of
Original 303(d)
Listings
WA-08-1060
Area Where
TMDL
Requirements
Apply
Requirements apply in all areas regulated under the Permittees municipal
stormwater permit and draining to the portion of the WASWIS segment
SM74QQ starting at the confluence with the Sammamish River and
including all upstream tributaries contributing to the Swamp Creek segment
of WASWIS GJ57UL.
Parameter Fecal Coliform
EPA Approval
Date
August 16, 2006
MS4 Permittee Phase I Permit: Snohomish County
Phase II Permit: Everett, Bothell, Lynnwood, Brier, Mountlake Terrace,
Kenmore
Actions Required
Business Inspections: Each Permittee shall inspect commercial animal handling areas and
commercial composting facilities to ensure implementation of source control BMPs for bacteria.
Commercial animal handling areas are associated with Standard Industrial Code (SIC) 074 and
075 and include veterinary and pet care/boarding services, animal slaughtering, and support
activities for animal production. Facilities where the degradation and transformation of organic
solid waste takes place under controlled conditions designed to promote aerobic decomposition
are considered composting facilities (definition in accordance with Chapter 173-350 WAC). All
qualifying facilities shall be inspected by August 1, 2016. Permittees shall implement an ongoing
inspection program to re-inspect facilities with bacteria source control problems a minimum of
every three years.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 10
Public Education and Outreach: Each Permittee shall conduct public education and outreach
activities to increase awareness of bacterial pollution problems and promote proper pet waste
management behavior.
Operations & Maintenance: Each Permittee shall install and maintain animal waste collection
and/or education stations at municipal parks and other Permittee owned and operated lands
reasonably expected to have substantial domestic animal (dog and horse) use and the potential
for pollution of stormwater.
IDDE: Permittees conducting IDDE-related field screening under S5.C.8 of the Phase I permit or
S5.C.3 of the Western Washington Phase II permit shall screen for bacteria sources in any
screened MS4 subbasins which discharge to surface waters in the TMDL area.
Targeted Source Identification & Elimination: By February 2, 2014, each Permittee shall
review the fecal coliform data collected per approved QAPPs under the 2007 Permit. The
purpose of this review is to identify a minimum of one high priority area (such as a tributary or a
stream segment) that will be the focus of source identification and elimination efforts during this
permit cycle. Each Permittee shall prepare written documentation of this review and the
identified high priority area; documentation shall be submitted with the Annual Report for 2014.
Permittees shall begin to implement source identification and elimination efforts in the MS4
subbasins discharging to the identified high priority area no later than August 1, 2014. Permittees
are encouraged to address potential bacteria pollution sources not associated with the MS4.
Stormwater quality sampling for bacteria sources is required as part of this focused source
identification and elimination effort. Permittees shall implement the schedules and activities
identified in S5.C.8 of the Phase I permit or S5.C.3 of the Western Washington Phase II permit
in response to any illicit discharges found. Each annual report’s TMDL summary shall include
qualitative and quantitative information about the source identification and elimination activities,
including procedures followed and sampling results, implemented in the selected high priority
area(s).
Surface Water Monitoring: Each Permittee shall review the fecal coliform data collected per
approved QAPPs under the 2007 Permit and select surface water monitoring location(s) as
appropriate for continued characterization and long term trends evaluation of fecal coliform.
Each Permittee shall submit a draft revised QAPP to Ecology for review and approval, no later
than February 2, 2015. If Ecology does not request changes within 60 days, the draft QAPP is
considered approved. At a minimum, the monitoring program shall:
• Begin by August 1, 2015.
• Collect 12 samples in at least one location per calendar year.
• Submit available data to the Environmental Information Management (EIM) database by
May 31 of each year.
• Provide data summaries and narrative evaluation of the data in each annual report’s
TMDL summary.
• Be documented in a QAPP which follows Guidelines for Preparing Quality Assurance
Project Plans for Environmental Studies, July 2004, Ecology Publication No. 04-03-030.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 11
Permittees shall follow Ecology-approved QAPPs unless changes are approved by Ecology.
Permittees subject to multiple TMDL monitoring requirements may conduct an integrated
monitoring program in accordance with an Ecology-approved QAPP. Snohomish County may
combine the high priority area source identification and elimination requirement with the surface
water monitoring requirement as documented in the County’s microbial water quality assessment
(MWQA), or similar, program per an Ecology-approved QAPP.
Name of TMDL Bear-Evans Watershed
Document(s) for
TMDL Bear-Evans Watershed Fecal Coliform Bacteria Total Maximum Daily
Load, Water Quality Improvement Report, June 2008, Ecology Publication
No. 08-10-026.
https://fortress.wa.gov/ecy/publications/summarypages/0810026.html
Bear-Evans Watershed Temperature, Dissolved Oxygen and Fecal Coliform
Bacteria Total Maximum Daily Load, Water Quality Implementation Plan,
March 2011, Ecology Publication No. 11-10-024.
http://www.ecy.wa.gov/biblio/1110024.html
Location of
Original 303(d)
Listings
Bear Creek (EW54VY, BA64JJ, WR69YU))
Cottage Lake Creek (NO74J5)
Unnamed Tributary to Bear Creek (EU47RU)
Evans Creek (MI67EG)
Area Where
TMDL
Requirements
Apply
Bear Creek and Evans Creek watersheds (includes Cottage Lake watershed)
Parameter Fecal Coliform
EPA Approval
Date
August 11, 2008
MS4 Permittee Phase I: King County
Phase II: No actions identified for Phase II Permittees
Actions Required
King County
• Install and maintain animal waste education and/or collection stations at municipal parks
and other Permittee owned and operated lands reasonably expected to have substantial
domestic animal (dog and horse) use and the potential for pollution of stormwater.
• Designate areas discharging via the MS4 to the TMDL area as high priority areas for
illicit discharge detection and elimination. Complete IDDE field screening for bacteria
sources in 50 percent of MS4 subbasins, including rural MS4 subbasins, by February 2,
2017, and implement the schedules and activities identified in S5.C.8 of the Phase I
permit for response to any illicit discharges found.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 12
Name of TMDL Cottage Lake
EPA Approved
Document(s) for
TMDL
Cottage Lake, Total Phosphorus, Total Maximum Daily Load Analysis,
Submittal Report, June 2004, Ecology Publication No. 03-10-085.
http://www.ecy.wa.gov/biblio/0310085.html
Cottage Lake, Total Phosphorus, Total Maximum Daily Load, Water
Quality Implementation Plan, March 2007, Ecology Publication No. 06-10-
066. http://www.ecy.wa.gov/biblio/0610066.html
Location of
Original 303(d)
Listings
WA-08-9070 & 49ITVC
Area Where
TMDL
Requirements
Apply
Cottage Lake and tributaries to Cottage Lake
Parameter Total Phosphorus
EPA Approval
Date
September 2004
MS4 Permittee Phase I: King County
Action Required
King County shall apply phosphorus control treatment requirements to new and redevelopment
projects, as applicable, throughout the Cottage Lake watershed, including all tributaries to
Cottage Lake. King County’s Department of Development and Environmental Services (DDES)
shall not rely on the quarter mile/15 percent distance downstream clause in King County’s
Surface Water Design Manual.
Name of TMDL Issaquah Creek Basin Water Cleanup Plan for Fecal Coliform Bacteria
Document(s) for
TMDL
Issaquah Creek Basin Water Cleanup Plan for Fecal Coliform Bacteria:
Total Maximum Daily Load Submittal Report, June 2004. Ecology
Publication No. 04-10-055.
http://www.ecy.wa.gov/pubs/0410055.pdf
Location of
Original 303(d)
Listings
Issaquah Creek, TF310B (WA-08-1110)
North Fork Issaquah Creek, CZ80NC (WA-08-1110)
Tibbetts Creek, MB51QQ, EA48LQ (WA-08-1115)
Area Where
TMDL
Requirements
Apply
These requirements apply to areas served by MS4s within the TMDL
coverage area.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 13
Parameter(s) Fecal Coliform Bacteria
EPA Approval
Date
October 1, 2004
MS4 Permittee: Phase I Permit: King County
Phase II Permit: City of Issaquah, WAR04-5518
Actions Required
City of Issaquah
• Designate areas discharging via the MS4 to Tributary 0170 and to the Lewis Lane Outfall
as the highest priority areas for illicit discharge detection and elimination routine field
screening efforts. Complete field screening for bacteria sources by December 31, 2014
and implement the schedules and activities identified in S5.C.3 of the Western
Washington Phase II permit for response to any illicit discharges found.
• Install and maintain pet waste education and collection stations at municipal parks and
other Permittee owned and operated lands adjacent to streams. Focus on locations where
people commonly walk their dogs.
King County
• Install and maintain animal waste education and/or collection stations at municipal parks
and other Permittee owned and operated lands reasonably expected to have substantial
domestic animal (dog and horse) use and the potential for pollution of stormwater.
• Designate areas discharging via MS4 to the TMDL area as high priority areas for illicit
discharge detection and elimination. Complete IDDE field screening for bacteria sources
in 50 percent of the MS4 subbasins, including rural MS4 subbasins, by August 1, 2018,
and implement the schedules and activities identified in S5.C.8 of the Phase I permit for
response to any illicit discharges found.
Name of TMDL Little Bear Creek Fecal Coliform Water Quality Improvement Project
Document(s) for
TMDL
Little Bear Creek Fecal Coliform Total Maximum Daily Load (Water
Cleanup Plan), May 2005, Ecology Publication No. 05-10-034.
http://www.ecy.wa.gov/biblio/0510034.html
Location of
Original 303(d)
Listings
Little Bear Creek, UT96KR (WA-08-1085).
Area Where
TMDL
Requirements
Apply
These requirements apply to areas served by MS4s within the TMDL
coverage area.
Parameter(s) Fecal coliform bacteria
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 14
EPA Approval
Date
July 1, 2005
MS4 Permittee: Phase I Permit: Snohomish County
Phase II Permit: City of Woodinville, WAR04-5545
Actions Required
City of Woodinville
• By December 31, 2014, complete field screening of Little Bear Creek to identify
potential illicit discharges or connections. Conduct bacteria sampling from any flowing
outfall, in accordance with protocols in Illicit Discharge Detection and Elimination: A
Guidance Manual for Program Development and Technical Assessments, Center for
Watershed Protection, October 2004, or another methodology of comparable or improved
effectiveness. Implement related schedules and activities identified in S5.C.3 of the
Western Washington Phase II permit for response to any illicit discharges found.
• Confirm that pet waste collection stations are installed and maintained in all public
lands/parks adjacent to Little Bear Creek.
Snohomish County
• Prioritize and conduct bacteria source identification and elimination in high priority MS4
subbasins that discharge to surface waters in the area where these TMDL requirements
apply. In order to prioritize bacteria source identification and elimination activities based
on surface water quality data, Snohomish County shall incorporate the Little Bear Creek
watershed into the County’s microbial water quality assessment (MWQA), or similar,
monitoring program in accordance with the schedule for QAPP development and
approval required for the Snohomish River Tributaries TMDL.
• Inspect commercial animal handling areas and commercial composting facilities to
ensure implementation of source control BMPs for bacteria. Commercial animal
handling areas are associated with Standard Industrial Code (SIC) 074 and 075 and
include veterinary and pet care/boarding services, animal slaughtering, and support
activities for animal production. Facilities where the degradation and transformation of
organic solid waste takes place under controlled conditions designed to promote aerobic
decomposition are considered composting facilities (definition in accordance with
Chapter 173-350 WAC). All qualifying facilities must be inspected by August 1, 2016.
Permittees shall implement an ongoing inspection program to re-inspect facilities with
bacteria source control problems every three years.
• Conduct public education and outreach activities to increase awareness of bacterial
pollution problems and promote proper pet waste management behavior.
• Install and maintain animal waste collection and/or education stations at municipal parks
and other Permittee owned and operated lands reasonably expected to have substantial
domestic animal (dog and horse) use and the potential for pollution of stormwater.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 15
Name of TMDL Puyallup Watershed Water Quality Improvement Project
Document(s) for
TMDL Puyallup River Watershed Fecal Coliform Total Maximum Daily Load – Water
Quality Improvement Report and Implementation Plan, June 2011, Ecology
Publication No. 11-10-040. http://www.ecy.wa.gov/biblio/1110040.html
Location of
Original 303(d)
Listings
Puyallup River 16712, 7498, White River 16711, 16708, 16709, Clear
Creek 7501, Swan Creek 7514, Boise Creek 16706
Area Where
TMDL
Requirements
Apply
Requirements apply in all areas regulated under the Permittees’ municipal
stormwater permit and discharging to water bodies listed within the specific
requirement in this TMDL section.
Parameter Fecal Coliform
EPA Approval
Date
September 2011
MS4 Permittee Phase I Permit: King County, Pierce County
Phase II Permit: Auburn, Edgewood, Enumclaw, Puyallup, Sumner
Actions Required
City of Auburn
• Beginning no later than October 1, 2013, conduct twice monthly wet weather sampling of
stormwater discharges to the White River at Auburn Riverside High School to determine if
specific discharges from Auburn’s MS4 exceed the water quality criteria for fecal coliform
bacteria.
o Data shall be collected for one wet season.
o Data shall be collected in accordance with an Ecology-approved QAPP.
o Data collected since EPA TMDL approval can be used to meet this requirement.
• For any of the outfalls monitored, above showing discharges that exceed water quality
criteria for primary contact recreation: designate those areas discharging via the MS4 of
concern as high priority areas for illicit discharge detection and elimination efforts and
implement the schedules and activities identified in S5.C.3 of the Western Washington Phase
II permit for response to any illicit discharges found beginning no later than August 1, 2014.
• Install and maintain pet waste education and collection stations at municipal parks and other
Permittee owned and operated lands adjacent to streams. Focus on locations where people
commonly walk their dogs.
City of Edgewood
• Designate areas discharging via the MS4 to Jovita Creek as the highest priority areas for
illicit discharge detection and elimination routine field screening and implement the
schedules and activities identified in S5.C.3 of the Western Washington Phase II permit.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 16
City of Enumclaw
• Designate areas discharging via the MS4 to Boise Creek from creek mile 1.7 to 1.0 as the
highest priority areas for illicit discharge detection and elimination routine field screening.
Implement the schedules and activities identified in S5.C.3 of the Western Washington Phase
II permit, and implement a pet waste education program in this area according to S5.C.1 of
the permit.
King County
• Designate areas discharging via the MS4 to Boise Creek as high priority areas for illicit
discharge detection and elimination. Complete IDDE field screening for bacteria sources in
100 percent of the MS4 subbasins, including rural subbasins, by February 2, 2016 and
implement the schedules and activities identified in S5.C.8 of the Phase I permit for response
to any illicit discharges found. Field screening must include activities for both the dry season
(May through September) and the wet season (October through April).
• Inventory commercial animal handling areas (associated with Standard Industrial Code 074
and 075) in areas discharging via the MS4 to Boise Creek and conduct inspections of these
areas as part of the Source Control program required in S5.C.7 of the Phase I permit. All
qualifying facilities must be inspected by August 1, 2016. The Permittee shall implement an
ongoing inspection program to re-inspect facilities or areas with bacteria source control
problems every three years.
• Designate areas discharging via the MS4 to Jovita Creek as high priority areas for illicit
discharge detection and elimination field screening, and implement the schedules and
activities identified in S5.C.8 of the Phase I permit.
Pierce County
• Designate areas discharging via MS4 to Swan Creek as high priority areas for illicit
discharge detection and elimination efforts. Complete field screening by December 31, 2014
and implement the schedules and activities identified in S5.C.8 of the Phase I permit.
• Designate areas discharging via MS4 to Salmon Creek as high priority areas for illicit
discharge detection and elimination field screening and implement the schedules and
activities identified in S5.C.8 of the Phase I permit.
• Designate areas discharging via the MS4 to Alderton Creek as high priority areas for illicit
discharge detection and elimination field screening and implement the schedules and
activities identified in S5.C.8 of the Phase I permit.
• Designate areas discharging via the MS4 to upper Deer Creek as high priority areas for illicit
discharge detection and elimination field screening and implement the schedules and
activities identified in S5.C.8 of the Phase I permit.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 17
City of Puyallup
• Designate areas discharging via the MS4 to Deer Creek as high priority areas for illicit
discharge detection and elimination field screening and implement the schedules and
activities identified in S5.C.3 of the Western Washington Phase II permit. Focus
investigation on field screening during dry weather (May through September).
City of Sumner
• Designate areas discharging via the MS4 to Salmon Creek as the highest priority areas for
illicit discharge detection and elimination routine field screening and implement the
schedules and activities identified in S5.C.3 of the Western Washington Phase II permit.
Name of TMDL Clarks Creek Fecal Coliform TMDL
Document(s) for
TMDL Clarks Creek Watershed Fecal Coliform Bacteria Total Maximum Daily
Load (Water Quality Improvement Report), May 2008, Ecology Publication
No. 07-10-110. http://www.ecy.wa.gov/biblio/0710110.html
Clarks Creek Watershed Fecal Coliform Bacteria Total Maximum Daily
Load (Water Quality Implementation Plan), December 2009, Ecology
Publication No. 09-10-081. http://www.ecy.wa.gov/biblio/0910081.html
Location of
Original 303(d)
Listings
Clarks Creek 7497, 7501, Meeker Creek 7508, 7507
Area Where
TMDL
Requirements
Apply
Requirements apply in all areas regulated under the Permittees’ municipal
stormwater permit and discharging to water bodies listed within the specific
requirement in this TMDL section.
Parameter Fecal Coliform
EPA Approval
Date
June 4, 2008
MS4 Permittee Phase II Permit: Puyallup
Actions Required
City of Puyallup
• Designate areas discharging via the MS4 to Meeker Creek as high priority areas for illicit
discharge detection and elimination field screening and implement the schedules and
activities identified in S5.C.3 of the Western Washington Phase II permit.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 18
Name of TMDL South Prairie Creek Water Quality Improvement Project
Document(s) for
TMDL South Prairie Creek Bacteria and Temperature Total Maximum Daily Load
(Water Cleanup Plan): Submittal Report, June 2003, Ecology Publication
No. 03-10-055. http://www.ecy.wa.gov/biblio/0310055.html
South Prairie Creek Bacteria and Temperature Total Maximum Daily Load
(Water Cleanup Plan): Detailed Implementation Plan, July 2006, Ecology
Publication No. 06-10-018. http://www.ecy.wa.gov/biblio/0610018.html
Location of
Original 303(d)
Listings
South Prairie Creek VC19MO (WA-10-1085), Wilkeson Creek NX07HW
(WA-10-1087)
Area Where
TMDL
Requirements
Apply
Requirements apply in all areas regulated under the Permittees’ municipal
stormwater permit and discharging to water bodies listed within the specific
requirement in this TMDL section.
Parameter Fecal Coliform
EPA Approval
Date
August 6, 2003
MS4 Permittee Phase I Permit: Pierce County
Phase II Permit: Buckley
Actions Required
Pierce County
• Designate areas discharging via the MS4 to Tributary 1 upstream of SR162 as high priority
areas for illicit discharge detection and elimination efforts. Complete field screening by
December 31, 2013 and implement the schedules and activities identified in S5.C.8 of the
Phase I permit for response to any illicit discharges found. Investigation must include
activities for both the dry season (May through September) and the wet season (October
through April).
• Designate areas discharging to Pierce County MS4 outfalls and conveyances upstream of
SR165 along Spiketon Road, Mundy Loss Road, and Spiketon Ditch Road as high priority
areas for illicit discharge detection and elimination efforts. Complete field screening by
December 31, 2013 and implement the schedules and activities identified in S5.C.8 of the
Phase I permit for response to any illicit discharges found. Investigation must include
activities for both the dry season (May through September) and the wet season (October
through April).
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 19
City of Buckley
• Designate areas discharging via the MS4 to Spiketon Creek as the highest priority areas for
illicit discharge detection and elimination routine field screening and implement the
schedules and activities identified in S5.C.3 of the Western Washington Phase II permit.
Name of TMDL Nisqually River Basin Water Quality Improvement Project
Document(s) for
TMDL Nisqually Watershed Bacteria and Dissolved Oxygen Total Maximum Daily
Load (Water Cleanup Plan): Submittal Report, June 2005, Ecology
Publication No. 05-10-040. http://www.ecy.wa.gov/biblio/0510040.html
Nisqually River Basin Fecal Coliform Bacteria and Dissolved Oxygen Total
Maximum Daily Load: Water Quality Implementation Plan (WQIP), June
2007, Ecology Publication No. 07-10-016.
http://www.ecy.wa.gov/biblio/0710016.html
Location of
Original 303(d)
Listings
Nisqually Reach 390KRD (WA-PS-0290), Nisqually River OE72JI (WA-
11-1010), McAllister Creek LD26OX (WA-11-2000), Ohop Creek
MW64EV (WA-11-1024), Red Salmon Creek NoID (WA-PS-0290)
Area Where
TMDL
Requirements
Apply
Requirements apply in all areas regulated under the Permittees’ municipal
stormwater permit and discharging to water bodies listed within the specific
requirement in this TMDL section.
Parameter Fecal Coliform, Dissolved Oxygen
EPA Approval
Date
August 5, 2005
MS4 Permittee Phase I Permit: Pierce County
Phase II Permit: Thurston County
Actions Required
Pierce County
• Designate areas discharging via the MS4 to Ohop Creek and Lynch Creek as high priority
areas for illicit discharge detection and elimination efforts. Complete field screening by
December 31, 2014 and implement the schedules and activities identified in S5.C.8 of the
Phase I permit for response to any illicit discharges found.
Thurston County
• Annually implement the following best management practices for reducing fecal coliform
bacteria in areas discharging to the Nisqually Reach via the MS4 in accordance with S5.C.1
and S5.C.5 of the Western Washington Phase II Permit:
a. Reach households in targeted watershed through mailings, door hangers
etc. to increase awareness of the sources of bacteria pollution.
b. Adequately maintain vegetation around stormwater facilities, ditches, and
ponds.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 20
Name of TMDL Henderson Inlet Watershed Fecal Coliform Bacteria Water Quality
Improvement Project
Document(s) for
TMDL Henderson Inlet Watershed Fecal Coliform Bacteria, Dissolved Oxygen,
pH, and Temperature Total Maximum Daily Load Study, March 2006,
Ecology Publication No. 06-03-012.
http://www.ecy.wa.gov/biblio/0603012.html
Henderson Inlet Watershed Fecal Coliform Bacteria, Dissolved Oxygen,
and pH Total Maximum Daily Load: Water Quality Improvement Report
Implementation Strategy, October 2006, Ecology Publication No. 06-10-
058. http://www.ecy.wa.gov/biblio/0610058.html
Henderson Inlet Watershed Fecal Coliform Bacteria Total Maximum Daily
Load: Water Quality Implementation Plan, July 2008, Ecology Publication
No. 08-10-040. http://www.ecy.wa.gov/biblio/0810040.html
Location of
Original 303(d)
Listings
Henderson Inlet 390KRD (WA-13-0010), Dobbs Creek UNK000 (WA-13-
1400), Sleepy Creek UNK000 (WA-13-1700), Woodard Creek MJ83ZH
(WA-13-1600), Woodland Creek JH31LN (WA-13-1500)
Area Where
TMDL
Requirements
Apply
Requirements apply in all areas regulated under the permittees municipal
stormwater permit and discharging to water bodies listed within the specific
requirement in this TMDL section.
Parameter Fecal Coliform, Dissolved Oxygen, pH, Temperature
EPA Approval
Date
January 8, 2007
MS4 Permittee Phase II Permit: Lacey, Olympia, Thurston County
Actions Required
Thurston County
1. Annually implement the following best management practices in areas discharging to the
Henderson Inlet via the MS4 in accordance with S5.C.4 of the Western Washington Phase II
Permit:
a. Require phosphorus control for new and redevelopment projects that discharge via the
MS4 to Woodard Creek and meet the project thresholds in Appendix 1, Minimum
Requirement #6: Runoff Treatment of the Western Washington Phase II permit.
2. Annually implement the following best management practices for reducing fecal coliform in
areas discharging to the Henderson Inlet via the MS4 in accordance with S5.C.3 of the
Western Washington Phase II Permit:
a. Designate areas discharging via the MS4 to Woodland Creek from river mile 1.6 to 0.2
and Jorgenson Creek upstream of Pleasant Glade Road as high priority areas for illicit
discharge detection and elimination field screening. Implement the schedules and
activities identified in S5.C.3 of the Western Washington Phase II permit. Investigation
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 21
shall include stormwater ponds and on-site septic systems as potential fecal coliform
sources, and sampling of wet-weather discharges (November through April).
3. Annually implement the following best management practices for reducing fecal coliform in
areas discharging to the Henderson Inlet via the MS4 in accordance with S5.C.1 of the
Western Washington Phase II Permit.
a. Continue supporting the Watershed Septic System Operations and Maintenance Program.
Develop a targeted educational plan delivering:
i. Technical assistance to landowners through at least one presentation or workshop
annually.
ii. Technical assistance to landowners through one publication or targeted letter
annually.
iii. A resource webpage on the city’s website.
b. Continue offering public education and outreach efforts for fecal coliform reduction such
as brochures, signage and pet waste stations to homeowner associations.
City of Lacey
1. Annually implement the following best management practices in areas discharging to the
Henderson Inlet via the MS4 in accordance with S5.C. 1 of the Western Washington Phase II
Permit:
a. Continue the Private Stormwater Facilities Maintenance Program, providing
commercial and residential stormwater facility/BMP owners educational resources for
facility function and maintenance requirements.
b. Offer bacteria pollution reduction brochures, signage and pet waste stations to
homeowners associations.
c. Maintain pet waste bag dispenser units in City parks.
d. Install educational signage at City facilities/property.
e. Develop a targeted educational plan for septic system owners that includes; goals, target
audiences, messages, format, distribution and evaluation methods by December 31,
2016. Permittees may meet requirement individually or through regional efforts.
2. Continue developing and implementing a fecal coliform bacteria wet weather sampling
program for the College Regional Stormwater Facility by December 31, 2013 in accordance
with the illicit discharge detection and elimination efforts and activities identified in S5.C.3
of the Western Washington Phase II permit.
a. Submit a plan to Ecology for approval by November 1, 2013. The sampling program
shall establish a regularly scheduled sampling schedule (at least two times per year, as
feasible and consistent with the city’s Wet Weather Discharge Plan) during the wet
season (November through April), specific sampling locations, sampling protocols,
parameters, analytical methods and timelines for implementation.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 22
b. If sampling results indicate potential illicit discharges, conduct an investigation in
accordance with S5.C.3 of the Western Washington Phase II permit.
c. Submit a summary of sampling and investigations with each annual report.
3. Develop and implement a coordinated plan with the City of Olympia to monitor and reduce
fecal coliform bacteria discharges from the Fones/Taylor wetland treatment facilities by
December 31, 2014 in accordance with S5.C.3 of the Western Washington Phase II permit.
a. Submit a program plan to Ecology that includes a timeline for implementation,
sampling frequencies and identifies, at the minimum, who will be responsible for
sampling, investigations and enforcement by December 31, 2013.
b. If sampling results indicate potential illicit discharges, conduct an investigation in
accordance with S5.C.3 of the Western Washington Phase II permit.
c. Submit a summary of the coordinated efforts with sampling, investigation and
enforcement actions taken with the annual reports.
4. Annually implement the following best management practices in areas discharging to the
Henderson Inlet via the MS4 in accordance with S5.C.5 of the Western Washington Phase II
Permit:
• Continue re-vegetation and nuisance vegetation management along Woodland Creek
and its tributaries.
City of Olympia
1. Annually implement the following BMPs in areas discharging to the Henderson Inlet via the
MS4 in accordance with S5.C.4 of the Western Washington Phase II permit:
• Require phosphorus control for new and redevelopment projects that discharge via
MS4 to Woodard Creek and meet the project thresholds in Appendix 1, Minimum
Requirement #6: Runoff Treatment of the Western Washington Phase II permit.
2. Develop and implement a coordinated plan with the City of Lacey to monitor and reduce
fecal coliform bacteria discharges from the Fones/Taylor wetland treatment facilities by
December 31, 2014 in accordance with S5.C.3 Illicit Discharge Detection and Elimination of
the Western Washington Phase II permit.
a. Submit a program plan to Ecology that includes a timeline for implementation,
sampling frequencies and identifies, at the minimum, who will be responsible for
sampling, investigations and enforcement by December 31, 2013.
b. If sampling results indicate potential illicit discharges, conduct an investigation in
accordance with S5.C.3 of the Western Washington Phase II permit.
c. Submit a summary of the coordinated efforts with sampling, investigation and
enforcement actions taken with each annual report.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 23
Name of TMDL Sinclair and Dyes Inlets Fecal Coliform Bacteria Total Maximum Daily
Load
Document(s) for
TMDL
Sinclair and Dyes Inlets Fecal Coliform Bacteria Total Maximum Daily
Load (TMDL) Water Quality Implementation Plan, In Draft, Ecology
Publication No. 11-10-051.
Fecal Coliform Model Verification Sampling Plan (Winter 2004), February
19, 2004. http://www.ecy.wa.gov/programs/wq/tmdl/sinclair-
dyes_inlets/w2004_fc_sap_final_ecy.pdf
Fecal Coliform Total Maximum Daily Load Study Plan for Sinclair and
Dyes Inlet, October 4, 2002.
http://www.ecy.wa.gov/programs/wq/tmdl/sinclair-
dyes_inlets/fc_tmdl_studyplan_final_draft_print.pdf
Location of
Original 303(d)
Listings
Dyes Inlet & Port Washington Narrows (WA-15-0020)
Gorst Creek (WA-15-4000)
Blackjack Creek (WA-15-4200)
Annapolis Creek (WA-15-4400)
Beaver Creek (WA-15-4900)
Clear Creek (WA-15-5000)
Barker Creek (WA-15-5100)
Sinclair Inlet (WA-15-0040)
Area Where
TMDL
Requirements
Apply
These requirements apply to areas served by MS4s listed below within the
TMDL coverage area.
Parameter(s) Fecal coliform bacteria
EPA Approval
Date
July 5, 2012
MS4 Permittee: Phase II Permit: City of Bainbridge Island, WAR04-5503; City of
Bremerton, WAR04-5507; City of Port Orchard, WAR04-5536; Kitsap
County, WAR04-5546
Actions Required
City of Bainbridge Island
• If a minimum of 10 monthly ambient water quality samples collected under a previous
monitoring program approved by Ecology in nearshore areas below Lynwood Center
between 2011 and 2013 indicate that this area does NOT meet water quality standards, then
by December 1, 2014, the City shall designate those areas discharging via MS4 either
directly or to creeks that discharge to shoreline areas along Rich Passage as the highest
priority areas for illicit discharge detection and elimination field screening. The City shall
implement the schedules and activities identified in S5.C.3 of the Western Washington Phase
II permit for response to any illicit discharges found.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 24
• By December 31, 2016, review and, if necessary, increase the frequency of inspection and
cleanout of catch basins (under S5.C.4 and 5 of the Western Washington Phase II permit) to
maintain catch basin sediment levels below 60 percent full. Focus on MS4 areas that drain to
nearshore areas along Rich Passage below Lynwood Center and the northern shoreline of
Fletcher Bay near DOH site 457.
• Use appropriate investigative tools to ensure that contaminated stormwater is not
contributing to the fecal coliform bacteria exceedances at DOH site 457, offshore Fletcher
Bay.
• Install and maintain pet waste education and collection stations at Permittee owned and
operated lands adjacent to stream and marine shorelines. Focus on locations where people
commonly walk their dogs.
City of Bremerton
• Designate areas discharging via MS4 to Phinney and Ostrich Bay Creeks, to the eastern
shoreline of Oyster Bay near DOH site 487, and to shorelines along Port Washington
Narrows as the highest priority areas for illicit discharge detection and elimination routine
field screening and, beginning no later than August 1, 2014 implement the schedules and
activities identified in S5.C.3 of the Western Washington Phase II permit for response to any
illicit discharges found.
• By December 31, 2016, review and, if necessary, increase the frequency of inspection and
cleanout of catch basins (under S5.C.4 and 5 of the Western Washington Phase II permit) to
maintain catch basin sediment levels below 60 percent full. Focus on MS4 areas that drain to
Phinney and Ostrich Bay Creeks, to the eastern shoreline of Oyster Bay near DOH site 487
and to shorelines along Port Washington Narrows.
• Install and maintain pet waste education and collection stations at municipal parks and other
Permittee owned and operated lands adjacent to stream and marine shorelines. Focus on
locations where people commonly walk their dogs.
City of Port Orchard
• Designate areas discharging via MS4 to Blackjack, Annapolis, and Karcher Creeks and to
shorelines along Sinclair Inlet as the highest priority areas for illicit discharge detection and
elimination routine field screening and, beginning August 1, 2014, implement the associated
schedules and activities identified in S5.C.3 of the Western Washington Phase II permit for
response to any illicit discharges found.
• By December 31, 2016, review and, if necessary, increase the frequency of inspection and
cleanout of catch basins (under S5.C.4 and 5 of the Western Washington Phase II permit to
maintain catch basin sediment levels below 60% full. Focus on MS4 areas that drain to
Blackjack, Annapolis, and Karcher Creeks and to shorelines along Sinclair Inlet.
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 25
• Install and maintain pet waste education and collection stations at municipal parks and other
Permittee owned and operated lands adjacent to stream and marine shorelines. Focus on
locations where people commonly walk their dogs.
Kitsap County
• Designate areas discharging via MS4 to Barker, Clear, Strawberry, Ostrich Bay, and Phinney
creeks and shorelines at the head of Dyes Inlet as the highest priority areas for illicit
discharge detection and elimination routine field screening (including agricultural land use
inventories in rural areas) and, beginning no later than August 1, 2014, implement the
associated schedules and activities identified in S5.C.3 of the Western Washington Phase II
permit for response to any illicit discharges found. onduct illicit discharge detection and
elimination efforts in MS4 areas that discharge to Beaver, Pahrmann, Sacco, and upper
Blackjack creeks and to the western shoreline of Chico Bay near DOH site 471 as resources
allow.
• By December 31, 2016, review and, if necessary, increase the frequency of inspection and
cleanout of catch basins (in accordance with S5.C.4 and 5 of the Western Washington Phase
II permit) to maintain catch basin sediment levels below 60% full. Focus on areas within the
Sinclair and Dyes Inlet watershed with closed conveyance systems and catch basins.
• Install and maintain pet waste education and collection stations at municipal parks and other
Permittee owned and operated lands adjacent to stream and marine shorelines. Focus on
locations where people commonly walk their dogs.
Name of TMDL Grays Harbor/Chehalis Watershed Fecal Coliform Bacteria Total
Maximum Daily Load
Document(s) for
TMDL Grays Harbor/Chehalis Watershed Fecal Coliform Bacteria Total
Maximum Daily Load Submittal Report, December 2001, Ecology
Publication No. 01-10-025. http://www.ecy.wa.gov/biblio/0110025.html
Quality Assurance Project Plan: Grays Harbor Fecal Coliform Bacteria
Monitoring to Characterize Water Quality in Urban Stormwater Drains,
October 2010, Ecology Publication No. 10-10-066.
http://www.ecy.wa.gov/biblio/1010066.html
Location of
Original 303(d)
Listings
Outer Grays Harbor 390KRD (WA-22-0020), Inner Grays Harbor 390KRD
(WA-22-030), Inner Grays Harbor DS29ZH (WA-22-0030), Chehalis River
PB33WC (WA-22-4040)
Area Where
TMDL
Requirements
Apply
Requirements apply in all areas regulated under the Permittees’ municipal
stormwater permit and discharging to water bodies listed within the specific
requirement in this TMDL section.
Parameter Fecal Coliform
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 26
EPA Approval
Date
December 2002
MS4 Permittee Phase II Permit: Aberdeen
Actions Required
City of Aberdeen
1. Implement the schedules and activities identified in S5.C.1 of the Western Washington
Phase II Permit. No later than February 28, 2015, develop a Public Education and
Outreach and Involvement plan. The plan shall target the reduction of fecal coliform
pollution by increasing public awareness, effecting behavior changes and shall include:
goals, target audiences, messages, format, distribution, and evaluation methods.
a. The plan shall include at least the following elements and be fully implemented
prior to the expiration date of the permit:
i. Target the residents of the three high priority water bodies identified under
the 2007-2012 permit.
ii. Reach households in targeted watersheds through mailings, door hangers
or similar outreach tools.
iii. Reach 4-6th grade students.
b. Design and implement a program which notifies residents, in a timely manner,
when bacteria pollution that poses a public health concern (such as a wastewater
overflow) reaches the MS4.
c. Conduct two public education surveys gauging resident’s knowledge of the
sources of bacteria and preventing bacteria pollution. One survey should measure
resident’s knowledge of bacteria pollution before outreach and the other should
measure knowledge and likelihood of action after outreach.
d. Design and implement a stream team program where two citizen stream teams are
formed to participate in stewardship activities.
e. Install and maintain pet waste bag dispenser units and explanatory signs in public
areas with dog usage.
f. By December 31, 2014, develop an inventory of sources that have potential for
bacteria runoff such as manure-composting facilities, stables, kennels.
i. Develop a targeted manure management educational plan for such facility
owners delivering at least one presentation or letter annually and
developing a resource webpage on the city’s website.
2. Designate areas discharging to the MS4 urban drains identified in the TMDL as the
highest priority areas for illicit discharge detection and elimination routine field screening
efforts and implement the schedules and activities identified in S5.C.3 of the Western
Western Washington Phase II Municipal Stormwater Permit
Appendix 2 - Total Maximum Daily Load (TMDL) Requirements
Western Washington Phase II Municipal Stormwater Permit – August 1, 2013,
Modified January 16, 2015
Page 27
Washington Phase II permit. Field screening and source tracing methodology (see
S5.C.3.c) must be consistent with the Quality Assurance Project Plan: Grays Harbor
Fecal Coliform Bacteria Monitoring to Characterize Water Quality in Urban Stormwater
Drains, October 2010.
a. Implement a regulatory mechanism to control pet waste.
b. Designate areas discharging via MS4 to the following discharge points: 501-
ABDN, 510-MST, and 514-MST as high priority areas for illicit discharge
detection and elimination efforts.
i. Complete field screening by December 31, 2014 and implement the schedules
and priority area for illicit discharge detection and elimination field screening
identified in S5.C.3 of the Western Washington Phase II permit. Investigation
must include activities for both the dry season (May through October) and the
wet season (November through April).
ii. Beginning no later than October 31, 2014, conduct twice monthly wet weather
sampling of the discharge points 501-ABDN, 510-MST, and 514-MST to
determine if specific discharges from Aberdeen’s MS4 exceed the water
quality criteria for fecal coliform bacteria.
• Data shall be collected for two wet season.
• Data shall be collected in accordance with an Ecology-approved QAPP.
• Samples must be analyzed using an Ecology accredited lab.
• If sampling results indicate potential illicit discharges, conduct an
investigation in accordance with S5.C.3 Illicit Discharge Detection and
Elimination of the Western Washington Phase II permit.
• Data shall be submitted to Ecology in an approved format with the annual
reports.
Western Washington Municipal Stormwater Permit
August 1, 2013 Modified January 16, 2015 Appendix 3 – Annual Report for Cities, Towns and
Counties Page 1
Appendix 3 - Annual Report Questions for Cities, Towns
and Counties
Permittees are required to submit the following information in an online annual report
form, or an alternative format provided by Ecology if requested, pursuant to Special
Condition S9.A.
1. Attach updated annual Stormwater Management Program Plan (SWMP Plan). (S5.A.2)
2. Attach a copy of any annexations, incorporations or boundary changes resulting in an
increase or decrease in the Permittee’s geographic area of permit coverage during the
reporting period per S9.D.5.
3. Implemented an ongoing program to gather, track, and maintain information per S5.A.3,
including costs or estimated costs of implementing the SWMP.
4. Coordinated among departments within the jurisdiction to eliminate barriers to permit
compliance. (S5.A.5.b)
4b. Attach a written description of internal coordination mechanisms. (Required to be
submitted no later than March 31, 2015, S5.A.5.b)
5. Attach description of public education and outreach efforts conducted per S5.C.1.a.i and
ii.
6. Created stewardship opportunities (or partnered with others) to encourage resident
participation in activities such as those described in S5.C.1.b.
7. Used results of measuring the understanding and adoption of targeted behaviors among at
least one audience in at least one subject area to direct education and outreach resources
and evaluate changes in adoption of targeted behaviors. (Required no later than February
2, 2016, S5.C.1.b)
7b. Attach description of how this requirement was met.
8. Describe in Comments field the opportunities created for the public to participate in the
decision making processes involving the development, implementation and updates of the
Permittee’s SWMP. (S5.C.2.a)
9. Posted the updated SWMP Plan and latest annual report on your website no later than
May 31. (S5.C.2.b)
Western Washington Municipal Stormwater Permit
August 1, 2013 Modified January 16, 2015 Appendix 3 – Annual Report for Cities, Towns and
Counties Page 2
9b. List the website address in Comments field.
10. Maintained a map of the MS4 including the requirements listed in S5.C.3.a.i.-vi.
11. Implemented a compliance strategy, including informal compliance actions as well as
enforcement provisions of the regulatory mechanism described in S5.C.3.b. (S5.C.3.b.v)
12. Updated, if necessary, the regulatory mechanism to effectively prohibit illicit discharges
into the MS4 per S5.C.3.b.vi. (Required no later than February 2, 2018)
12b. If Yes, cite the code reference in Comments field
13. Implemented procedures for conducting illicit discharge investigations in accordance
with S5.C.3.c.i.
13b. Cite methodology in Comments field
14. Percentage of MS4 coverage area screened in reporting year per S5.C.3.c.i. (Required to
screen 40% of MS4 no later than December 31, 2017 (except no later than June 30, 2018
for the City of Aberdeen) and 12% on average each year thereafter. (S5.C.3)
15. List the hotline telephone number for public reporting of spills and other illicit discharges
in the Comments field. (S5.C.3.c.ii)
15b. Number of hotline calls received.
16. Implemented an ongoing illicit discharge training program for all municipal field staff per
S5.C.3.c.iii.
17. Informed public employees, businesses, and the general public of hazards associated with
illicit discharges and improper disposal of waste.
17b. Describe actions in Comments field. (S5.C.3.c.iv)
18. Implemented an ongoing program to characterize, trace, and eliminate illicit discharges
into the MS4 per S5.C.3.d.
19. Number of illicit discharges, including illicit connections, eliminated during the reporting
year. (S5.C.3.d.iv)
Western Washington Municipal Stormwater Permit
August 1, 2013 Modified January 16, 2015 Appendix 3 – Annual Report for Cities, Towns and
Counties Page 3
20. Attach a summary of actions taken to characterize, trace and eliminate each illicit
discharge found by or reported to the permittee. For each illicit discharge, include a
description of actions according to required timeline per S5.C.3.d.iv
21. Municipal illicit discharge detection staff are trained to conduct illicit discharge detection
and elimination activities as described in S5.C.3.e.
22. Implemented an ordinance or other enforceable mechanism to address runoff from new
development, redevelopment and construction sites per the requirements of S5.C.4.a.
23. Revised ordinance or other enforceable mechanism to effectively address runoff from
new development, redevelopment and construction sites per the requirements of
S5.C.4.a.i-iii. (Required no later than December 31, 2016, except no later than June 30,
2017 for Permittees in Lewis and Cowlitz counties, and no later than June 30, 2018 for
the City of Aberdeen)
23b. Cite code reference in Comments field.
24. Number of exceptions granted to the minimum requirements in Appendix 1. (S5.C.4.a.i.,
and Section 6 of Appendix 1)
25. Number of variances granted to the minimum requirements in Appendix 1. (S5.C.4.a.i.,
and Section 6 of Appendix 1)
26. Reviewed Stormwater Site Plans for all proposed development activities that meet the
thresholds adopted pursuant to S5.C.4.a.i. (S5.C.4.b.i)
26b. Number of site plans reviewed during the reporting period.
27. Inspected, prior to clearing and construction, permitted development sites that have a
high potential for sediment transport as determined through plan review based on
definitions and requirements in Appendix 7 Determining Construction Site Sediment
Damage Potential, or alternatively, inspected all construction sites meeting the minimum
thresholds adopted pursuant to S5.C.4.a.i. (S5.C.4.b.ii)
27b. Number of construction sites inspected per S5.C.4.b.ii.
28. Inspected permitted development sites during construction to verify proper installation
and maintenance of required erosion and sediment controls. (S5.C.4.b.iii)
28b. Number of construction sites inspected per S5.C.4.b.iii.
Western Washington Municipal Stormwater Permit
August 1, 2013 Modified January 16, 2015 Appendix 3 – Annual Report for Cities, Towns and
Counties Page 4
29. Number of enforcement actions taken during the reporting period (based on construction
phase inspections at new development and redevelopment projects). (S5.C.4.b.ii, iii and
v)
30. Inspected all permitted development sites that meet the thresholds in S5.C.4.a.i upon
completion of construction and prior to final approval or occupancy to ensure proper
installation of permanent stormwater facilities. (S5.C.4.b.iv)
31. Achieved at least 80% of scheduled construction-related inspections. (S5.C.4.b.ii-iv)
32. Verified a maintenance plan is completed and responsibility for maintenance is assigned
for projects. (S5.C.4.b.iv)
33. Implemented provisions to verify adequate long-term operation and maintenance (O&M)
of stormwater treatment and flow control BMPs/facilities that are permitted and
constructed pursuant to S5.C.4. a and b. (S5.C.4.c)
34. Updated provisions to verify long-term operation and maintenance of stormwater
treatment and flow control BMPs/facilities that are permitted pursuant to S5.C.4.a and b.
(Required no later than December 31, 2016, except no later than June 30, 2017 for
Permittees in Lewis and Cowlitz counties, and no later than June 30 2018 for the City of
Aberdeen, S5.C.4.c.i and ii
35. Annually inspected stormwater treatment and flow control BMPs/facilities per
S5.C.4.c.iii.
35b. If using reduced inspection frequency for the first time during this permit cycle, attach
documentation per S5.C.4.c.iii
36. Inspected new residential stormwater treatment and flow control BMPs/facilities and
catch basins every 6 months per S5.C.4.c.iv to identify maintenance needs and enforce
compliance with maintenance standards.
37. Achieved at least 80% of scheduled inspections to verify adequate long-term O&M.
(S5.C4.c.v)
38. Verified that maintenance was performed per the schedule in S5.C.4.c.vi when an
inspection identified an exceedance of the maintenance standard.
38b. Attach documentation of any maintenance delays. (S5.C.4.c.vi)
39. Provided copies of the Notice of Intent for Construction Activity and Notice of Intent for
Industrial Activity to representatives of proposed new development and redevelopment.
(S5.C.4.e)
Western Washington Municipal Stormwater Permit
August 1, 2013 Modified January 16, 2015 Appendix 3 – Annual Report for Cities, Towns and
Counties Page 5
40. All staff responsible for implementing the program to control stormwater runoff from
new development, redevelopment, and construction sites, including permitting, plan
review, construction site inspections, and enforcement are trained to conduct these
activities. (S5.C.4.f)
41. Reviewed, revised and made effective the low impact development-related enforceable
documents per S5.C.4.f.i. (Required by December 31, 2016, except by June 30, 2017 for
Permittees in Lewis and Cowlitz counties, and by June 30, 2018 for the City of
Aberdeen)
41b. Attach a summary of the LID review and revision process that includes the requirements
listed in S5.C.4.f.ii. (Required with annual report due no later than March 31, 2017,
except no later than March 31, 2018 for Permittees in Lewis and Cowlitz counties, and
with the Fifth Year annual report for the City of Aberdeen)
42. Where applicable, participated and cooperated with the watershed-scale stormwater
planning process led by a Phase I county. (S5.C.4.g)
43. Updated and implemented maintenance standards as protective, or more protective, of
facility function as those specified in Chapter 4 of Volume V of the Stormwater
Management Manual for Western Washington (as amended in 2014). (Required no later
than December 31, 2016, except no later than June 30, 2017 for Permittees in Lewis and
Cowlitz counties, and no later than June 30, 2018 for the City of Aberdeen, S5.C.5.a)
44. Applied a maintenance standard that is not specified in the Stormwater Management
Manual for Western Washington.
44b. Please note in the Comments field what kinds of facilities are covered by this alternative
maintenance standard. (S5.C.5.a)
45. Performed timely maintenance per S5.C.5.a.ii.
46. Annually inspected all municipally owned or operated permanent stormwater treatment
and flow control BMPs/facilities. (S5.C.5.b)
46b. Number of known municipally owned or operated stormwater treatment and flow control
BMPs/facilities. (S5.C.5.b)
46c. Number of facilities inspected during the reporting period. (S5.C.5.b)
46d. Number of facilities for which maintenance was performed during the reporting period.
(S5.C.5.b)
47. If using reduced inspection frequency for the first time during this permit cycle, attach
documentation per S5.C.5.b.
Western Washington Municipal Stormwater Permit
August 1, 2013 Modified January 16, 2015 Appendix 3 – Annual Report for Cities, Towns and
Counties Page 6
48. Conducted spot checks and inspections (if necessary) of potentially damaged stormwater
facilities after major storms as per S5.C.5.c.
49. Inspected all municipally owned or operated catch basins and inlets as per S5.C.5.d, or
used an alternative approach. (Required once no later than August 1, 2017 and every two
years thereafter, except once no later than June 30, 2018 and every two years thereafter
for the City of Aberdeen)
49b. Number of known catch basins.
49c. Number of catch basins inspected during the reporting period.
49d. Number of catch basins cleaned during the reporting period.
50. Attach documentation of alternative catch basin cleaning approach, if used. (S5.C.5.d.i
or ii)
51. Implemented practices, policies and procedures to reduce stormwater impacts associated
with runoff from all lands owned or maintained by the Permittee, and road maintenance
activities under the functional control of the Permittee. (S5.C.5.f)
52. Implemented an ongoing training program for Permittee employees whose primary
construction, operations or maintenance job functions may impact stormwater quality.
(S5.C.5.g.)
53. Implemented a Stormwater Pollution Prevention Plan for all heavy equipment
maintenance or storage yards, and material storage facilities owned or operated by the
Permittee in areas subject to this Permit that are not required to have coverage under an
NPDES permit that covers stormwater discharges associated with the activity. (S5.C.5.h)
54. Complied with the Total Maximum Daily Load (TMDL)-specific requirements identified
in Appendix 2. (S7.A)
55. For TMDLs listed in Appendix 2: Attach a summary of relevant SWMP and Appendix 2
activities to address the applicable TMDL parameter(s). (S7.A)
56. Attach a description of any stormwater monitoring or stormwater-related studies as
described in S8.A.
57. Participated in cost-sharing for the regional stormwater monitoring program (RSMP) for
status and trends monitoring. (S8.B.1)
57b. If choosing to conduct monitoring in accordance with S8.B.2., attach a data report in
accordance with the approved QAPP. (Required to begin monitoring no later than
October 31, 2014)
Western Washington Municipal Stormwater Permit
August 1, 2013 Modified January 16, 2015 Appendix 3 – Annual Report for Cities, Towns and
Counties Page 7
58. Participated in cost-sharing for the regional stormwater monitoring program (RSMP) for
effectiveness studies. (S8.D.1) (Required to begin no later than August 15, 2014)
58b. If choosing to conduct discharge monitoring, attach an annual stormwater monitoring
report in accordance with S8.C.2 and Appendix 9. (Required to submit reports beginning
March 31, 2016)
59. Contributed to the RSMP for source identification and diagnostic monitoring information
repository in accordance with S8.D. (Required to begin no later than August 15, 2014)
60. Notified Ecology in accordance with G3 of any discharge into or from the Permittees
MS4 which could constitute a threat to human health, welfare or the environment. (G3)
61. Number of G3 notifications provided to Ecology.
62. Took appropriate action to correct or minimize the threat to human health, welfare,
and/or the environment per G3.A.
63. Notified Ecology within 30 days of becoming aware that a discharge from the Permittee’s
MS4 caused or contributed to a known or likely violation of water quality standards in
the receiving water. (S4.F.1)
64. If requested, submitted an Adaptive Management Response report in accordance with
S4.F.3.a.
65. Attach a summary of the status of implementation of any actions taken pursuant to
S4.F.3 and the status of any monitoring, assessment, or evaluation efforts conducted
during the reporting period. (S4.F.3.d)
66. Notified Ecology of the failure to comply with the permit terms and conditions within 30
days of becoming aware of the non-compliance. (G20)
67. Number of non-compliance notifications (G20) provided in reporting year.
67b. List permit conditions described in non-compliance notification(s) in Comments field.
Western Washington Phase II Municipal Stormwater Permit
APPENDIX 4 – Annual Report Questions for
Secondary Permittees
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 4: Secondary Permittee Annual Report
Questions Page 1
VI. Status Report Covering Calendar Year _____
Secondary Permittees are required to submit annual reports online or in a format provided by
Ecology, pursuant to Special Condition S9.A
1. YES
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 4: Secondary Permittee Annual Report
Questions Page 2
S6.D.3 Illicit Discharge Detection and Elimination
6. YES
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 4: Secondary Permittee Annual Report
Questions Page 3
12. YES
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 4: Secondary Permittee Annual Report
Questions Page 4
S6.D.4 Construction Site Stormwater Control
16. YES
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 4: Secondary Permittee Annual Report
Questions Page 5
S6.D.5 Post-Construction Stormwater Management for New Development and
Redevelopment
21. YES
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 4: Secondary Permittee Annual Report
Questions Page 6
Comments:
27. YES
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 4: Secondary Permittee Annual Report
Questions Page 7
may constitute a threat to human health, welfare, or the environment.
(G3)
Comments:
_____________________________________________________________________________
34. YES
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 5- Notice of Intent for Coverage Page 1 of 5
APPENDIX 5: Notice of Intent (NOI) for Coverage
under a National Pollutant Discharge
Elimination System (NPDES)
Municipal Stormwater General Permit
Introduction
This form must be used by all entities seeking initial coverage under one or more of the following
municipal separate storm sewer permits:
Phase I Municipal Stormwater Permit – “National Pollutant Discharge Elimination System
and State Waste Discharge General Permit for Discharges from Large and Medium Municipal
Separate Storm Sewer Systems”
Western Washington Phase II Municipal Stormwater Permit – “National Pollutant
Discharge Elimination System and State Waste Discharge General Permit for Discharges from
Small Municipal Separate Storm Sewers in Western Washington”
Eastern Washington Phase II Municipal Stormwater Permit – “National Pollutant
Discharge Elimination System and State Waste Discharge General Permit for Discharges from
Small Municipal Separate Storm Sewers in Eastern Washington”
The Department of Ecology (Ecology) will use the information provided to determine if coverage
under one or more of the above municipal stormwater general permits is required and/or appropriate.
Please answer all questions accurately and completely. If a question does not apply, answer NA to that
question. See instructions at the back of the form for more information.
Operators of municipal separate storm sewer systems (MS4s) seeking permit coverage must complete
this application and return it to Ecology. You may print this form and complete it by hand, or
download the form from Ecology’s Web site and fill it out electronically. The form is available at:
www.ecy.wa.gov/biblio/ecy070207.html.
A certified signature is needed to complete the application. Please reference supporting documents in
the text and attach as necessary.
Mail completed NOI to:
Department of Ecology
Water Quality Program
Municipal Stormwater Permits
P.O. Box 47696
Olympia, WA 98504-7696
Ecology will send each applicant an acknowledgment of receipt. If you have questions about this
application, please contact the appropriate Ecology employee listed at
www.ecy.wa.gov/programs/wq/stormwater/municipal/municontacts.html , or call Ecology’s Water
Quality Program at 360-407-6600.
.
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 5 - Notice of Intent for Coverage Page 2 of 5
Part 1 - Owner/Operator Information
A. Applicant Information
Name of city, county, or special district:
Mailing Address:
PO Box (Optional) :
City: State: Zip:
B. Responsible Official or Representative
Name:
Title:
Phone:
Email:
Mailing Address:
PO Box (Optional) :
City: State: Zip:
C. Billing Address, if different
Name:
Mailing Address:
PO Box (Optional) :
City: State: Zip:
D. Primary Contact Person
Name:
Title:
Phone No. Business: Ext. :
Email:
Fax No. (Optional):
Mailing Address:
PO Box (Optional):
City: State: Zip:
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 5 - Notice of Intent for Coverage Page 3 of 5
E. Ownership Status
(check appropriate box)
City or Town
County
Federal
Federally-recognized Indian Tribe
Special Purpose District:(secondary permittee)
Diking/drainage district Port
Flood control district University
Public school district Park district
State agency (give name)
Other (please describe)
Part 2 – Permits under which the applicant is requesting coverage (see instructions)
Phase I Municipal Stormwater Permit
Western Washington Phase II Municipal Stormwater Permit
Eastern Washington Phase II Municipal Stormwater Permit
If you own or operate MS4s that are located in areas covered by more than one permit, please list the
locations of all of the MS4s for which you are requesting permit coverage.
Part 3 – Population served by the MS4
Estimated resident population (public entities that are not cities, towns, or counties also include
commuter populations) served by the MS4 within the geographic area(s) covered by the
permits:
Part 4 – Map(s)
A. Is part of the MS4 located within Indian Country (within a reservation or on land held in
trust for a tribe)? For the Puyallup reservation only, check “yes” if MS4 is located on trust
lands and “no” if any part of the MS4 is located on fee lands. Yes No
B. For special purpose districts only, attach a map or maps delineating the geographic area
served by the MS4. Attach map(s) to this form
Not applicable
Part 5 – Co-Permittee information
Complete this part of the NOI only if you are applying as a Co-Permittee with another entity to
meet the requirements of the permit. Permittees that apply as Co-Permittees are responsible for
meeting permit conditions related to their discharge(s).
If you are applying with another entity or entities as Co-Permittee(s) please include, as an
attachment to this NOI, a summary of the permit obligations that will be carried out jointly among
Co-Permittees. The summary must identify the other Co-Permittee(s) and must be signed by the
other Co-Permittee(s).
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 5 - Notice of Intent for Coverage Page 4 of 5
Attach a summary of joint permit obligations
Summary is signed by all Co-Permittees
Not Applicable
Part 6 - Relying on another entity to satisfy permit requirement(s)
Complete this part of the NOI only if you are relying on another entity to satisfy all of the
requirements of the permit. Permittees that rely on another entity to satisfy all of their permit
obligations remain responsible for permit compliance if the other entity fails to implement the
permit conditions. Permittees may rely on another entity provided:
1. The other entity agrees to take on responsibility for implementation of the permit
requirement(s),
AND
2. The other entity implements the permit requirements.
If you are relying on another entity or entities to satisfy all of the permit obligations, please include
as an attachment to this NOI a summary of the permit obligations that will be carried out by
another entity. The summary must identify the other entity or entities and must be signed by the
other entity or entities.
Attach summary of permit obligations carried out by another entity
Summary is signed by all other entities
Not Applicable
Part 7 – Public Notice
A public notice must be published at least once each week for two consecutive weeks in a single
newspaper of general circulation in the county or city in which the district or entity is located. See
the NOI instructions for the public notice language requirements. Permit coverage will not be
granted sooner than 31 days after the date of the second public notice.
Submit the NOI and public notice to Ecology before the date of the first public notice. A copy of
the NOI and public notice may be faxed to (360) 407-6426.
Name of the newspaper that will publish the public notices:
Provide the exact dates (mm/dd/yy) that the first and second public notices will appear in the
newspaper:
Date of the first notice / /
Date of second notice / /
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 5 - Notice of Intent for Coverage Page 5 of 5
Part 8 - Certification
I certify under penalty of law that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. The information submitted is, to the best of
my knowledge and belief, true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fine and imprisonment for
knowing violations.
Print or type name of responsible official or representative Title
/ /
Signature of responsible official or representative Date
If you need this document in a format for the visually impaired, call the Water Quality Program at
360-407-6600. Persons with hearing loss can call 711 for Washington Relay Service. Persons with a
speech disability can call 877-833-6341.
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013 Appendix 5 - Notice of Intent for Coverage Page 1 of 6
INSTRUCTIONS
These instructions will help you prepare an application, referred to as a Notice of Intent (NOI), for
coverage under a National Pollutant Discharge Elimination System (NPDES) General Permit and State
Waste Discharge Permit for stormwater discharges associated with MS4s in Washington State.
Questions?
If you have questions, please contact the Ecology employee who manages the permit in the county or
counties in which your facility or district is located available at
http://www.ecy.wa.gov/programs/wq/stormwater/municipal/municontacts.html or, call Ecology’s
Water Quality Program office at 360-407-6600, and the receptionist will direct you to a staff member
who can assist you.
Who must apply?
Federal and state law requires all operators of regulated MS4s to apply for and obtain coverage under
this permit or to be permitted under a separate individual permit, unless it qualifies for a waiver or
exemption in accordance with conditions described below (see Who does not need to apply?).
1. A regulated MS4 is a municipal separate storm sewer system that:
• Is located within, or partially within, the unincorporated areas of Clark, King, Pierce or
Snohomish counties; or
• Is located within, or partially within, the cites of Seattle or Tacoma; or
• Is located within the other areas defined in the permits. See list of cities and counties in Part
2 of the line-by-line instructions or Ecology’s maps of permit coverage
www.ecy.wa.gov/programs/wq/stormwater/phase_2/maps.html for more information on
these locations; or
• Is designated by Ecology
AND
• Discharges stormwater from the MS4 to a water of the United States; and
• Is not eligible for an exemption or a waiver.
2. All owners or operators of MS4s that meet the criteria listed above must obtain coverage under
this permit. Owners or operators of MS4s may also include, but are not limited to: public flood
control districts, public diking, and drainage districts, public schools including universities, and
correctional facilities that own or operate an MS4 serving non-agricultural land uses.
3. If Ecology determines the MS4 is a significant source of pollution to surface waters of the state,
Ecology may require any other operators of small MS4s to obtain permit coverage. Ecology
will notify the affected MS4 that permit coverage is required by issuing an administrative order
(see RCW 90.48).
Who does not need to apply?
If either of the following conditions applies, state and federal laws do not require a MS4 to obtain
permit coverage:
If the portions of the MS4 located within the census defined urban area(s) that discharge to surface
waters serve a total population of less than 1000 people** and all the conditions below apply, then
the MS4 qualifies for a waiver and need not apply:
• The MS4 is not contributing substantially to the pollutant loadings of a physically
interconnected MS4 that is regulated by the NPDES stormwater program.
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013 Appendix 5 - Notice of Intent for Coverage Page 2 of 6
• The discharge of pollutants from the MS4 has not been identified as a cause of impairment
of any water body to which the MS4 discharges.
• In areas where an EPA approved Total Maximum Daily Load (TMDL), or water quality
improvement plan for impaired waters, has been completed, stormwater controls on the
MS4 have not been identified as being necessary.
**In determining the total population served, cities and counties include resident populations;
other public entities include resident and commuter populations as follows:
• For publicly operated school complexes including universities and colleges, the total
population served includes the sum of the average annual student enrollment plus staff.
• For flood control, diking, and drainage districts, the total population served includes
residential population and any non-residents regularly employed in the areas served by
the MS4.
Exempt MS4s are those owned or operated by:
• A federal entity, including any department, agency or instrumentality of the executive,
legislative, and judicial branch of the Federal government of the United States; or
• Federally recognized Indian Tribes located within Indian Country, including all trust or
restricted lands within the 1873 Survey Area of the Puyallup Tribe of Indians.
Federal and tribal MS4s are not covered under this permit but may need coverage under a
permit issued by the USEPA.
When to apply
Submit the NOI to the Department of Ecology on or before the date of the first public notice required
in part 7 of this NOI. Ecology must have the permit application during the public comment period
required by this NOI in order to provide the public access to the applications as required by state law
(WAC 173-226-130(5)).
Ecology cannot grant permit coverage until 31 days after the date of the second public notice.
Upon receipt of a complete NOI, Ecology will notify the applicant by mail of confirmation of coverage
under the permit. An NOI is deemed complete only after the 30-day public comment period and all
other requested information has been supplied. Permit coverage will begin on the date specified in
Ecology’s letter of confirmation.
Where to apply
Mail the signed NOI to: Washington Department of Ecology
Water Quality Program
Municipal Stormwater Permits
P.O. Box 47696
Olympia, WA 98504-7696
Fees
There is no application fee. Ecology will bill the applicant(s) for permit fees after permit coverage
is issued in accordance with Chapter 173-224 WAC. Call the Permit Fee Unit of Ecology at
360-407-6425 for questions relating to permit fees.
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013 Appendix 5 - Notice of Intent for Coverage Page 3 of 6
Line-by-line Instructions
Part 1 – Owner/Operator information
A. Applicant information - Fill out the name and mailing address of the city, county, or public
entity that will receive coverage under the permit.
B. Responsible Official or Representative – Fill out the name, address and contact information for
the principal executive officer or ranking elected official responsible for signing the
application. See Part 8 for more information.
C. Billing information - If a separate department or office handles billing, enter the appropriate
contact information. There is an annual permit fee associated with this permit.
D. Primary Contact person - Enter the name, title, address, phone number, and email for the
person who will be in charge of developing the stormwater management program and meeting
the stormwater permit requirements.
E. Ownership status - Check the appropriate box indicating the ownership status (e.g., city,
county, or special district type).
Part 2 – Permit(s) under which the applicant is requesting coverage
Check the box that corresponds to the permit(s) under which you are applying for coverage. The
geographic locations covered by each permit break down as follows:
• Phase I – covers entities within, or partially within the unincorporated areas of Clark, King, Pierce,
or Snohomish counties; or the cities of Seattle or Tacoma.
• Phase II Western Washington – covers entities in the census-defined urban areas of western
Washington, and associated urban growth areas, some cities with populations over 10,000 or areas
otherwise designated by Ecology.
• Phase II Eastern Washington – covers entities in the census-defined urban areas of eastern
Washington, and associated urban growth areas, and some cities with populations over 10,000 or
areas otherwise designated by Ecology.
Note: Applicants may submit a single NOI to request coverage of all of the MS4s that they own or
operate. For example, a single NOI may be submitted to cover the main campus and any satellite
campuses of a university that may require permit coverage. Applicants requesting coverage for
multiple sites/locations must list the locations for each site/location for which coverage is being
requested. When more than one permit is checked, Ecology will consult with the applicant to
determine whether to assign all the sites to separate permits or to one permit that will provide
coverage.
Part 3 – Population served by the MS4
Provide an estimate of the population served by the MS4 within the geographic area(s) covered by the
permits. Cities, towns, and counties include only the resident population. For special purpose districts
and other public entities that are not cities, towns, or counties, the estimate must include both resident
and commuter populations. For example, a university may have a resident population of students who
live on campus and a commuter population of students and employees who commute to campus. (See
above for information on determining the commuter population in Who does not need to apply?)
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013 Appendix 5 - Notice of Intent for Coverage Page 4 of 6
Part 4 – Map requirements
A. Is part of the MS4 located within Indian Country (within a reservation or on land held in trust
for a tribe)? For the Puyallup reservation only, check “yes” if MS4 is located on trust lands and
“no” if any part of the MS4 is located on fee lands. The portion of the MS4 that is located on
tribal lands will not be covered under these permits.
B. For special purpose districts only, attach a map or maps delineating the geographic area served
by the MS4.
Part 5 – Co-Permittee information
Complete this part of the NOI only if you are applying with another entity as Co-Permittees to meet the
requirements of this permit. Permittees that apply as Co-Permittees are responsible for meeting permit
conditions related to their discharge(s).
If you are applying as a Co-Permittee with another entity or entities, please include as an attachment to
this NOI a summary of the permit obligations that will be carried out jointly among Co-Permittees.
The summary must identify the other Co-Permittee(s) and must be signed by the other Co-Permittee(s).
Part 6 - Relying on another entity to satisfy permit requirement(s)
Complete this part of the NOI only if you are relying on another entity to satisfy all of the requirements
of the permit. Permittees may rely on another entity provided the entity satisfies all of the requirements
it agrees to undertake (see 40 CFR 122.35(a)).
That other entity must agree to take responsibility and implement the permit requirement(s).
Permittees that rely on another entity to satisfy all of their permit obligations remain responsible for
permit compliance with those obligations if the other entity fails to implement the permit conditions.
If you are relying on another entity or entities to satisfy all of the permit obligations, please include as
an attachment to this NOI a summary of the permit obligations that will be carried out by another
entity. The summary must identify the other entity or entities and must be signed by the other entity or
entities.
Part 7 – Public notice
You must publish a public notice in a newspaper of general circulation in the county or city in which
the district or entity is located. The following sample public notice contains the required public notice
elements.
Sample Public Notice
(Name and address of municipality, district or other public entity) is seeking coverage under (select
one of the following):
Phase I Permit – “National Pollutant Discharge Elimination System and State Waste
Discharge General Permit for Discharges from Large and Medium Municipal Separate Storm
Sewer Systems”
Western Washington Phase II Permit – “National Pollutant Discharge Elimination System
and State Waste Discharge General Permit for Discharges from Small Municipal Separate
Storm Sewers in western Washington”
Eastern Washington Phase II Permit – “National Pollutant Discharge Elimination System
and State Waste Discharge General Permit for Discharges from Small Municipal Separate
Storm Sewers in eastern Washington”
The proposed permit will authorize stormwater discharges from the municipal separate storm sewer
system located in (city, town, or county). The permit requires (Name of municipality, district, or other
public entity) to develop and implement a stormwater management program that:
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013 Appendix 5 - Notice of Intent for Coverage Page 5 of 6
1. Reduces the discharge of pollutants to the maximum extent practicable.
2. Protects water quality.
3. Satisfies appropriate requirements of the Clean Water Act.
Any person desiring to present views to the Department of Ecology concerning this application may
notify Ecology in writing within 30 days from the last date of publication of this notice.
Submit comments to:
Washington Department of Ecology
Water Quality Program
Municipal Stormwater Permits
P.O. Box 47696
Olympia, WA 98504-7696
Fax: 360-407-6426
Part 8 - Certification
An authorized person, such as a principal executive officer or ranking elected official, must sign the
certification statement.
OR
A duly authorized representative of the executive officer (or ranking elected official) may sign the
certification as long as:
1. The signatory receives written authorization from the executive officer or ranking elected
official. This document must be submitted to Ecology at the same time as the completed NOI.
2. The authorization specifies an individual or position that has responsibility for the overall
development and implementation of the stormwater management program.
If you need this document in a format for the visually impaired, call the Water Quality Program at
360-407-6600. Persons with hearing loss can call 711 for Washington Relay Service. Persons with a
speech disability can call 877-833-6341.
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 6 – Street Waste Disposal Page 1 of 2
APPENDIX 6 – Street Waste Disposal
Street Waste Liquids
General Procedures:
Street waste collection should emphasize retention of solids in preference to
liquids. Street waste solids are the principal objective in street waste collection and are
substantially easier to store and treat than liquids.
Street waste liquids require treatment before their discharge. Street waste liquids
usually contain high amounts of suspended and total solids and adsorbed metals.
Treatment requirements depend on the discharge location.
Discharges to sanitary sewer and storm sewer systems must be approved by the
entity responsible for operation and maintenance of the system. Ecology will not
generally require waste discharge permits for discharge of stormwater decant to
sanitary sewers or to stormwater treatment BMPs constructed and maintained in
accordance with Ecology’s Stormwater Management Manual for Western Washington.
The following order of preference, for disposal of catch basin decant liquid
and water removed from stormwater treatment facilities, is required.
1. Discharge of catch basin decant liquids to a municipal sanitary sewer connected
to a Public Owned Treatment Works (POTW) is the preferred disposal option.
Discharge to a municipal sanitary sewer requires the approval of the sewer authority.
Approvals for discharge to a POTW will likely contain pretreatment, quantity and
location conditions to protect the POTW.
2. Discharge of catch basin decant liquids may be allowed into a Basic or
Enhanced Stormwater Treatment BMP, if option 1 is not available.
Decant liquid collected from cleaning catch basins and stormwater treatment wet vaults
may be discharged back into the storm sewer system under the following conditions:
• The preferred disposal option of discharge to sanitary sewer is not reasonably
available, and
• The discharge is to a Basic or Enhanced Stormwater Treatment Facility. If
pretreatment does not remove visible sheen from oils, the treatment facility must be
able to prevent the discharge of oils causing a visible sheen, and
• The discharge is as near to the treatment facility as is practical, to minimize
contamination or recontamination of the collection system, and
• The storm sewer system owner/operator has granted approval and has determined
that the stormwater treatment facility will accommodate the increased loading.
Pretreatment conditions to protect the stormwater treatment BMP may be issued as
part of the approval process. Following local pretreatment conditions is a
requirement of this permit.
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 6 – Street Waste Disposal Page
2 of 2
• Flocculants for the pretreatment of catch basin decant liquids must be non-toxic
under the circumstances of use and must be approved in advance by the Department
of Ecology.
The reasonable availability of sanitary sewer discharge will be determined by the
Permittee, by evaluating such factors as distance, time of travel, load restrictions, and
capacity of the stormwater treatment facility.
3. Water removed from stormwater ponds, vaults and oversized catch basins may
be returned to the storm sewer system. Stormwater ponds, vaults and oversized catch
basins contain substantial amounts of liquid, which hampers the collection of solids and
pose problems if the removed waste must be hauled away from the site. Water
removed from these facilities may be discharged back into the pond, vault or catch
basin provided:
• Clear water removed from a stormwater treatment structure may be discharged
directly to a down gradient cell of a treatment pond or into the storm sewer system.
• Turbid water may be discharged back into the structure it was removed from if
− the removed water has been stored in a clean container (eductor truck, Baker
tank or other appropriate container used specifically for handling stormwater or
clean water); and
− there will be no discharge from the treatment structure for at least 24 hours.
• The discharge must be approved by the storm sewer system owner/operator.
Street Waste Solids
Soils generated from maintenance of the MS4 may be reclaimed, recycled or reused
when allowed by local codes and ordinances. Soils that are identified as contaminated
pursuant to Chapter 173-350 WAC shall be disposed at a qualified solid waste disposal
facility.
Western Washington Phase II Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 7- Determining Sediment Damage
Potential Page 1 of 3
APPENDIX 7 – Determining Construction Site
Sediment Damage Potential
The following rating system allows objective evaluation of a particular development site’s
potential to discharge sediment. Permittees may use the rating system below or develop
alternative process designed to identify site-specific features which indicate that the site must be
inspected prior to clearing and construction. Any alternative evaluation process must be
documented and provide for equivalent environmental review.
Step one is to determine if there is a sediment/erosion sensitive feature downstream of the
development site. If there is such a site downstream complete step two, assessment of hydraulic
nearness. If there is a sediment/erosion sensitive feature and it is hydraulically near the site then
go to step three to determine the construction site sediment transport potential.
STEP 1 – Sediment/Erosion Sensitive Feature Identification
Sediment/erosion sensitive features are areas subject to significant degradation due to the effect
of sediment deposition or erosion. Special protection must be provided to protect them.
Sediment/erosion sensitive features include but are not limited to:
i. Salmonid bearing fresh water streams and their tributaries or freshwater streams
that would be Salmonid bearing if not for anthropogenic barriers;
ii. Lakes;
iii. Category I, II, and III wetlands;
iv. Marine near-shore habitat;
v. Sites containing contaminated soils where erosion could cause dispersal of
contaminants; and
vi. Steep slopes (25% or greater) associated with one of the above features.
Identify any sediment/erosion sensitive features, and proceed to step two. If there are none the
assessment is complete.
STEP 2 – Hydraulic Nearness Assessment
Sites are hydraulically near a feature if the pollutant load and peak quantity of runoff from the
site will not be naturally attenuated before entering the feature. The conditions that render a site
hydraulically near to a feature include, but are not limited to, the following:
i. The feature or a buffer to protect the feature is within 200 feet downstream of the
site.
ii. Runoff from the site is tight-lined to the feature or flows to the feature through a
channel or ditch.
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 7- Determining Sediment Damage
Potential Page 2 of 3
A site is not hydraulically near a feature if one of the following takes place to provide attenuation
before runoff from the site enters the feature:
i. Sheet flow through a vegetated area with dense ground cover
ii. Flow through a wetland not included as a sensitive feature
iii. Flow through a significant shallow or adverse slope, not in a conveyance channel,
between the site and the sensitive feature.
Identify any of the sediment/erosion sensitive features from step one that are hydraulically near
the site, and proceed to step three. If none of the sediment/erosion sensitive features are
hydraulically near the site, the assessment is complete.
STEP 3 – Construction Site Sediment Transport Potential
Using the worksheet below, determine the total points for each development site. Assign points
based on the most critical condition that affects 10% or more of the site.
If soil testing has been performed on site, the results should be used to determine the
predominant soil type on the site. Otherwise, soil information should be obtained from the
county soil survey to determine Hydrologic Soil Group (Table of Engineering Index Properties
for step 1.D) and Erosion Potential (Table of Water Features for step 1.E)
When using the county soil survey, the dominant soil type may be in question, particularly when
the site falls on a boundary between two soil types or when one of two soil types may be present
on a site. In this case, the soil type resulting in the most points on the rating system will be
assumed unless site soil tests indicate that another soil type dominates the site.
Use the point score from Step 3 to determine whether the development site has a high potential
for sediment transport off of the site.
Total Score Transport Rating
<100 Low
≥100 High
A high transport rating indicates a higher risk that the site will generate sediment contaminated
runoff.
Western Washington Phase II Municipal Stormwater Permit
August 1, 2013, Modified January 16, 2015 Appendix 7- Determining Sediment Damage
Potential Page 3 of 3
Construction Site Sediment Transport Potential Worksheet
A. Existing slope of site (average, weighted by aerial extent): Points
2% or less ........................................................................................ 0
>2-5% .............................................................................................. 5
>5-10% .......................................................................................... 15
>10-15% ........................................................................................ 30
>15% ............................................................................................. 50
B. Site Area to be cleared and/or graded:
<5,000 sq. ft. ..................................................................................... 0
5,000 sq. ft. – 1 acre ....................................................................... 30
>1 acres ......................................................................................... 50
C. Quantity of cut and/or fill on site:
<500 cubic yards ............................................................................. 0
500 – 5,000 cubic yards .................................................................. 5
>5,000 – 10,000 cubic yards ......................................................... 10
>10,000 – 20,000 cubic yards ....................................................... 25
>20,000 cubic yards ...................................................................... 40
D. Runoff potential of predominant soils (Natural Resources Conservation Service):
Hydrologic soil group A ................................................................. 0
Hydrologic soil group B ................................................................ 10
Hydrologic soil group C ................................................................ 20
Hydrologic soil group D ............................................................... 40
E. Erosion Potential of predominant soils (Unified Classification System):
GW, GP, SW, SP soils .................................................................... 0
Dual classifications (GW-GM, GP-GM, GW-GC,
GP-GC, SW-SM, SW-SC, SP-SM, SP-SC) .......................... 10
GM, GC, SM, SC soils .................................................................. 20
ML, CL, MH, CH soils ................................................................. 40
F. Surface or Groundwater entering site identified and intercepted 1:
Yes ................................................................................................... 0
No ................................................................................................. 25
G. Depth of cut or height of fill >10 feet:
Yes ................................................................................................. 25
No ................................................................................................... 0
H. Clearing and grading will occur in the wet season (October 1 – May 1):
Yes ................................................................................................. 50
No ................................................................................................... 0
TOTAL POINTS ............................................................................................. ________
1 If no surface or groundwater enters site, give 0 points.
Western Washington Phase II Municipal Stormwater Permit
Appendix 8 - Annual Report for New Permittees
August 1, 2013, Modified January 16, 2015
Page 1
APPENDIX 8 – Annual Report Questions for New
Permittees
New Permittees that are Cities, Towns or Counties are required to submit the
following information in an online annual report form, or an alternative format
provided by Ecology if requested, pursuant to Special Condition S9.A.
1. Attach updated annual Stormwater Management Program Plan
(SWMP Plan). (S5.A.2)
2. Attach a notification of any annexations, incorporations or
boundary changes resulting in an increase or decrease in the
Permittee’s geographic area of permit coverage during the
reporting period per S9.D.5.
3. Implemented an ongoing program to gather, track, and maintain
information per S5.A.3, including costs or estimated costs of
developing and implementing the SWMP. (Required to begin no
later than August 1, 2015)
4. Coordinated among departments within the jurisdiction to
eliminate barriers to permit compliance? (S5.A.5.b)
4b. Attach a written description of internal coordination
mechanisms. (Required to be submitted no later than March 31,
2015, S5.A.5.b)
5. Attach description of public education and outreach efforts
conducted per S5.C.1.a. i-ii. (Required to begin no later than
August 1, 2015)
6. Provided stewardship opportunities (or partnered with others) to
encourage resident participation. (Required to begin no later than
August 1, 2015, S5.C.1.b)
7. Used results of measuring the understanding and adoption of
targeted behaviors among at least one audience in at least one
subject area to direct education and outreach resources and
evaluate changes in adoption of targeted behaviors. (Required no
later than August 1, 2017, S5.C.1.c)
Western Washington Phase II Municipal Stormwater Permit
Appendix 8 - Annual Report for New Permittees
August 1, 2013, Modified January 16, 2015
Page 2
7b. Attach description of how this requirement was met.
8. Describe in Comments field the opportunities created for the
public to participate in the decision making processes involving
the development, implementation and updates of the Permittee’s
SWMP. (Required to begin no later than August 1, 2014,
S5.C.2.a)
9. Posted the updated SWMP Plan and latest annual report on your
website no later than May 31. (Required to begin posting no later
than May 31, 2015, S5.C.2.b)
9b. List the website address in Comments field.
10. Developed a map of the MS4 that includes the requirements listed
in S5.C.3.a.i.-vi. (Required no later than August 1, 2017)
11. Mapped all connections to the MS4 authorized or allowed by the
Permittee. (Required to begin no later than August 1, 2013,
S5.C.3.a.v)
12. Adopted and implemented an ordinance or other regulatory
mechanism to effectively prohibit illicit discharges per the
requirements in S5.C.3.b.i.-iv. (Required no later than February
2, 2016)
12b. Cite reference for ordinance or other regulatory mechanism to
meet this requirement in Comments field.
13. Developed and implemented a compliance strategy, including
informal compliance actions as well as enforcement provisions of
the ordinance (S5.C.3.b.v) (Required no later than February 2,
2016)
14. Developed and implemented procedures for conducting illicit
discharge investigations in accordance with S5.C.3.c.i.
(Required no later than February 2, 2018)
14b. Cite methodology used in the Comments sections.
Western Washington Phase II Municipal Stormwater Permit
Appendix 8 - Annual Report for New Permittees
August 1, 2013, Modified January 16, 2015
Page 3
15. Screened on average 12% of MS4 within coverage area each year
in accordance with S5.C.3.c.i. (Required to screen 12% no later
than December 31, 2017; 20% on average each year thereafter,
S5.C.3.c.i)
16. Publicized a hotline telephone number for public reporting of
spills and other illicit discharges. (Required to begin no later than
August 1, 2015, S5.C.3.c.ii)
16b. Number of hotline calls received during the reporting period.
16c. Provide telephone number in the Comments field.
17. Developed and implemented an ongoing illicit discharge training
program for all municipal field staff per S5.C.3.c.iii. (Required to
begin no later than February 2, 2016)
18. Informed public employees, businesses, and the general public of
hazards associated with illicit discharges and improper disposal
of waste? (Required to begin no later than February 2, 2017,
S5.C.3.c.iv)
18b. Describe activities in Comments field.
19. Developed and implemented a program to characterize, trace, and
eliminate illicit discharges into the MS4 found by or reported to
the Permittee. (Required to begin no later than February 2, 2018,
S5.C.3.d.i)
20. Number of illicit discharges, including illicit connections,
eliminated during the reporting year. (Required no later than
February 2, 2018, S5.C.3.d.iii and iv)
21. Attach a summary of actions taken to characterize, trace and
eliminate each illicit discharge found by or reported to the
permittee. For each illicit discharge, include a description of
actions according to required timeline per S5.C.3.d.iv. (Required
no later than February 2, 2018)
22. Trained municipal illicit discharge detection staff to conduct
illicit discharge detection and elimination activities referenced in
S5.C.3.e. (Required no later than February 2, 2016)
Western Washington Phase II Municipal Stormwater Permit
Appendix 8 - Annual Report for New Permittees
August 1, 2013, Modified January 16, 2015
Page 4
23. Developed and implemented a program to reduce pollutants in
stormwater runoff to the MS4 from new public or private
development, redevelopment and construction site activities.
(Required no later than December 31, 2017, S5.C.4)
24. Adopted and implemented an ordinance or other enforceable
mechanism to address runoff from new development,
redevelopment and construction sites per the requirements of
S5.C.4.a. (Required no later than December 31,2017)
24b. Cite the jurisdiction code reference used to meet this requirement
in Comments field.
25. Number of exceptions granted to the minimum requirements in
Appendix 1. (Required no later than December 31, 2017,
S5.C.4.a.i and Section 6 of Appendix 1)
26. Number of variances granted to the minimum requirements in
Appendix 1. (Required no later than December 31, 2017,
S5.C.4.a.i and Section 6 of Appendix 1)
27. Reviewed Stormwater Site Plans for all proposed development
activities that meet the thresholds adopted pursuant to S5.C.4.a.i.
(Required no later than December 31, 2017, S5.C.4.b.i)
27b. Number of site plans reviewed during the reporting period.
28. Inspected, prior to clearing and construction, all permitted
development sites that have a high potential for sediment
transport as determined through plan review based on definitions
and requirements in Appendix 7 Determining Construction Site
Sediment Damage Potential, or alternatively, inspected all
construction sites meeting the minimum thresholds adopted
pursuant to S5.C.4.a.i. (Required no later than December 31,
2017, S5.C.4.b.ii)
28b. Number of construction sites inspected per S5.C.4.b.ii.
29. Inspected all permitted development sites during construction to
verify proper installation and maintenance of required erosion
and sediment controls. (Required no later than December 31,
2017, S5.C.4.b.iii)
Western Washington Phase II Municipal Stormwater Permit
Appendix 8 - Annual Report for New Permittees
August 1, 2013, Modified January 16, 2015
Page 5
29b. Number of construction sites inspected per S5.C.4.b.iii.
30. Number of enforcement actions taken during the reporting period
based on construction phase inspections at new development and
redevelopment projects. (Required no later than December 31,
2017, S5.C.4.b.ii, iii and v)
31. Inspected all permitted development sites that meet the thresholds
in S5.C.4.a.i upon completion of construction and prior to final
approval or occupancy to ensure proper installation of stormwater
facilities. (Required no later than December 31, 2017, S5.C.4.b.iv
and v)
32. Verified a maintenance plan is completed and responsibility for
maintenance is assigned for projects. (Required no later than
December 31, 2017, S5.C.4.b.iv)
33 Achieved at least 80% of scheduled construction-related
inspections. (Required no later than December 31, 2017,
S5.C.4.b.ii-iv)
34. Developed and implemented a program to verify adequate long-
term operation and maintenance (O&M) of stormwater flow
control and treatment BMPs/facilities that are permitted and
constructed pursuant to S5.C.4(b). (Required no later than
December 31, 2017, S5.C.4.c)
35. Adopted and implemented an ordinance or other enforceable
mechanism that clearly identifies the party responsible for
maintenance, requires inspection and establishes enforcement
procedures. (Required no later than December 31, 2017,
S5.C.5.c.i)
36. Established maintenance standards as described in S5.C.4.c.ii.
(Required no later than December 31, 2017)
37. Annually inspected stormwater treatment and flow control
BMPs/facilities per S5.C.4.c.iii.(Required no later than December
31, 2017)
Western Washington Phase II Municipal Stormwater Permit
Appendix 8 - Annual Report for New Permittees
August 1, 2013, Modified January 16, 2015
Page 6
37b. If using reduced inspection frequency for the first time during this
permit term, attach documentation as per S5.C.4.c.iii. (Required
if applicable no later than December 31, 2017)
38. Inspected new stormwater treatment and flow control
BMPs/facilities and catch basins for new developments every 6
months until 90% of the lots are constructed (or until construction
has stopped and the site is fully stabilized) to identify
maintenance needs and enforce compliance with maintenance
standards as needed? (Required no later than December 31, 2017,
S5.C4.c.ii)
39. Achieved at least 80% of scheduled inspections to verify
adequate long-term O&M. (Required no later than December 31,
2017, S5.C4.c.v)
40. Verified that maintenance was performed per the schedule in
S5.C.4.c.vi when an inspection identified an exceedance of the
maintenance standard. (Required no later than December 31,
2017)
40b. Attach documentation of any maintenance delays.(S5.C.4.c.vi)
41. Provided copies of the Notice of Intent for Construction Activity
and Notice of Intent for Industrial Activity to representatives of
proposed new development and redevelopment. (Required no
later than August 1, 2013, S5.C.4.d)
42. Ensured that all staff responsible for implementing the program to
control stormwater runoff from new development,
redevelopment, and construction sites are trained to conduct these
activities, as per S5.C.4.e. (Required to begin no later than
December 31, 2017)
43. Reviewed, revised and made effective the low impact
development-related codes, rules, standards and other enforceable
documents as per S5.C.4.f.i. (Required no later than December
31, 2017)
43b. Attach a summary of the LID review and revision process that
includes the requirements listed in S5.C.4.f.ii. (Required to be
submitted no later than March 31, 2018)
Western Washington Phase II Municipal Stormwater Permit
Appendix 8 - Annual Report for New Permittees
August 1, 2013, Modified January 16, 2015
Page 7
44. Where applicable, participated and cooperated with the
watershed-scale stormwater planning process led by a Phase I
county. (S5.C.4.g)
45. Developed and implemented maintenance standards as protective,
or more protective, of facility function as those specified in
Chapter 4 of Volume V of the Stormwater Management Manual
for Western Washington. (Required no later than December 31,
2017, S5.C.5.a)
46. Applied a maintenance standard that is not specified in the
Stormwater Management Manual for Western Washington.
(Required to report, if applicable, no later than December 31,
2017, S5.C.5.a)
46b. Please note in the Comments field what kinds of facilities are
covered by this alternative maintenance standard.
47. Performed timely maintenance as per S5.C.5.a.ii. (Required no
later than December 31, 2017)
47b. Attach documentation of any maintenance delays. (Required, if
applicable, no later than December 31, 2017, S5.C.5.a.ii)
48. Annually inspected all municipally owned or operated permanent
stormwater treatment and flow control BMPs/facilities. (Required
no later than December 31, 2017, S5.C.5.b)
48a. Number of known municipally owned or operated stormwater
treatment and flow control BMPs/facilities.
48b. Number of facilities inspected during the reporting period.
48c. Number of facilities for which maintenance was performed
during the reporting period.
49. If used a reduced inspection frequency, attach documentation as
per S5.C.5.b (Required, if applicable, no later than December 31,
2017)
Western Washington Phase II Municipal Stormwater Permit
Appendix 8 - Annual Report for New Permittees
August 1, 2013, Modified January 16, 2015
Page 8
50. Conducted spot checks and inspections (if necessary) of
potentially damaged stormwater facilities after major storms.
(Required no later than December 31, 2017, S5.C.5.c)
51. Inspected all municipally owned or operated all catch basins and
inlets owned or operated by the Permittee at least once during the
permit term, or used an alternative approach. (Required no later
than February 2, 2018, S5.C.5.d)
51b. Number of known catch basins.
51c. Number of catch basins inspected.
51d. Number of catch basins cleaned.
52. Attach documentation of alternative catch basin cleaning
approach, if used. (Required, if applicable, no later than
February 2, 2018, S5.C.5.d.i- iii)
53. Developed and implemented practices, policies and procedures to
reduce stormwater impacts associated with runoff from all lands
owned or maintained by the Permittee, and road maintenance
activities under the functional control of the Permittee. (Required
no later than December 31, 2017, S5.C.5.f)
54. Developed and implemented an ongoing training program for
Permittee employees whose primary construction, operations or
maintenance job functions may impact stormwater quality.
(Required no later than December 31, 2017, S5.C.5.g.)
55. Developed and implemented a Stormwater Pollution Prevention
Plan (SWPPP) for all heavy equipment maintenance or storage
yards, and material storage facilities owned or operated by the
Permittee in areas subject to this Permit as described in S5.C.6.h.
(Required no later than December 31, 2017, S5.C.6.h)
56. Complied with the Total Maximum Daily Load (TMDL) specific
requirements identified in Appendix 2, if applicable. (S7.A)
57. If applicable, for TMDLs listed in Appendix 2 attach a summary
of relevant SWMP and Appendix 2 activities to address the
applicable TMDL parameter. (S7.A)
Western Washington Phase II Municipal Stormwater Permit
Appendix 8 - Annual Report for New Permittees
August 1, 2013, Modified January 16, 2015
Page 9
58. Attach a description of any stormwater monitoring or
stormwater-related studies as described in S8.A.
59. Notified Ecology in accordance with G3 of any discharge into or
from the Permittee’s MS4 which could constitute a threat to
human health, welfare or the environment. (G3)
60. Number of G3 notifications provided to Ecology.
61. Took appropriate action to correct or minimize the threat to
human health, welfare, and/or the environment per G3.A.
62. Notified Ecology within 30 days of becoming aware that a
discharge from the Permittee’s MS4 caused or contributed to a
known or likely violation of water quality standards in the
receiving water. (S4.F.1)
63. If requested, submitted an Adaptive Management Response
report in accordance with S4.F.3.a.
64. Attach a summary of the status of implementation of any actions
taken pursuant to S4.F.3 and the status of any monitoring,
assessment, or evaluation efforts conducted during the reporting
period? (S4.F.3.d)
65. Notified Ecology of the failure to comply with the permit terms
and conditions within 30 days of becoming aware of the non-
compliance? (G20)
66. Number of non-compliance notifications (G20) provided in
reporting year.
66b. List permit conditions described in non-compliance
notification(s) in Comments field.
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 1 of 14
APPENDIX 9 – Stormwater Discharge Monitoring
This Appendix applies to Permittees with stormwater discharge monitoring requirements
pursuant to Special Condition S8 Monitoring and Assessment, particularly sections S8.B.2, for
Clark County, and S8.C.2, if a Permittee chooses not to participate in the Regional Stormwater
Monitoring Program (RSMP) by paying into a collective fund to implement RSMP effectiveness
studies.
Stormwater discharge monitoring is intended to characterize stormwater runoff quantity and
quality at a limited number of locations in a manner that allows analysis of loadings and changes
in conditions over time and generalization across the Permittee’s jurisdiction.
QAPP Preparation
Permittees shall prepare a Quality Assurance Project Plan (QAPP) in accordance with Quality
Assurance Project Plan Guidance, Special Condition S8.D, Phase I Municipal Stormwater
Permit, December 2010 (Ecology Publication no. 10-10-075
http://www.ecy.wa.gov/pubs/1010075.pdf). The QAPP shall be developed by qualified staff or
contractors with experience in applying Ecology or Environmental Protection Agency (EPA)
QAPP Guidelines.
A stormwater discharge monitoring QAPP shall be submitted to Ecology in accordance with the
deadlines in S8. The QAPP shall describe field collection methods and sample preparation
methods appropriate to each group of analytes, reporting limits, and field conditions.
Permittees are responsible for maintaining an up-to-date approved QAPP for stormwater
discharge monitoring. Significant changes shall be reviewed by Ecology and reflected in a
revised QAPP. Significant changes include, but are not limited to:
• Land disturbing activities over 10 acres in size within the sampled drainage area.
• Relocating a monitoring station.
• Introducing new sampling equipment.
• Unanticipated back water conditions, base flow, or tidal influences.
• Changes in laboratories, analytical methods, or reporting limits.
Discharge Monitoring Location Selection
Stormwater monitoring discharge monitoring locations shall have mapped tributary conveyance
systems and drainage areas, and be suitable for permanent installation and operation of flow-
weighted composite sampling equipment. Additional monitoring location selection guidance and
information about how to estimate a rainfall to runoff relationship is available in Standard
Operating Procedure for Automatic Sampling for Stormwater Monitoring, ECY002 from the
Ecology Quality Assurance Page (http://www.ecy.wa.gov/programs/eap/quality.html; specific
guidance for automatic sampling is available at
http://www.ecy.wa.gov/programs/eap/qa/Agency/ECY_WQ_SOP_AutomatedSampling_v1_0E
CY002.pdf).
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 2 of 14
Permittees may identify a discharge monitoring location upstream in the conveyance system (i.e.,
upgradient of the outfall) in order to achieve the desired land use, to accommodate the
installation of sampling equipment, and/or to avoid or minimize back water or tidal interference.
The QAPP shall describe each stormwater discharge monitoring location and associated drainage
basin in detail. The QAPP must describe how each discharge monitoring location was selected,
the size of the drainage basin, and the percentage of area in the drainage basin representing the
following land uses: high density residential, low density residential, commercial, industrial,
agriculture, and transportation right-of-way. Table A9-1 below provides characteristics to
consider for some of these land uses. However, density definitions can vary from jurisdiction to
jurisdiction and may be defined locally in codes and comprehensive plans. Report the residential
density definitions used if they differ from these.
Table A9-1 Land Use Selection Characteristics
Land use category Characteristics
High density residential 4 dwelling units per acre or greater
Medium to high density residential 2 to 4 dwelling units per acre
Low density residential 1 to 2 dwelling units per acre
Commercial Includes multi-family residential
Industrial Not predominated by one facility with a few operators
Flow Monitoring
Discharge monitoring locations must be evaluated for a rainfall to runoff relationship in order to
ensure that the discharge monitoring location will receive enough runoff for sufficient sample
volume. This rainfall to runoff relationship will also assist in programming the automatic
sampling equipment. In order to establish the rainfall to runoff relationship, one year of
continuous flow recording (including base flow and all storm events) is necessary.
Monitoring Frequency
Permittees shall sample each stormwater discharge monitoring location according to the
frequency described below. Documented good faith efforts with good professional practice by
the Permittee which do not result in collecting a successful sample for the full number of
required storms may be considered as contributing toward compliance with this requirement.
For each location, the Permittee shall sample and analyze a minimum of eleven (11) qualifying
storm events per water year. Qualifying storm event sampling must be distributed throughout the
year, approximately reflecting the distribution of rainfall between the wet and dry seasons (with
a goal of 60-80% of the samples collected during the wet season and a goal of 20-40% of the
samples collected in the dry season).
Ecology may approve a reduced sampling frequency if the Permittee provides a statistical
analysis demonstrating that monitoring goals can be met with fewer samples.
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 3 of 14
Qualifying Storm Event Criteria
The wet season is from October 1 through April 30. A qualifying wet season storm event is
defined as follows:
• Rainfall volume: 0.20” minimum, no fixed maximum
• Rainfall duration: No fixed minimum or maximum
• Antecedent dry period: Less than or equal to 0.05” rain in the previous 24 hours
• Inter-event dry period: 6 hours
The dry season is from May 1 through September 30. A qualifying dry season storm event is
defined as follows:
• Rainfall volume: 0.20” minimum, no fixed maximum
• Rainfall duration: No fixed minimum or maximum
• Antecedent dry period: less than or equal to 0.02” rain in the previous 48 hours
• Inter-event dry period: 6 hours
Types of Sampling
Storm events shall be sampled using flow-weighted composite sampling techniques. Automatic
samplers shall be programmed to begin sampling as early in the runoff event as practical and to
continue sampling past the longest estimated time of concentration for the tributary area. Refer to
Standard Operating Procedure for Automatic Sampling for Stormwater Monitoring, ECY002
(http://www.ecy.wa.gov/programs/eap/quality.html) for guidance on how to conduct flow
weighted composite sampling.
For storm events lasting less than 24 hours, samples shall be collected for at least seventy-five
percent (75%) of the storm event hydrograph. For storm events lasting longer than 24 hours,
samples shall be collected for at least seventy-five percent 75% of the hydrograph of the first 24
hours of the storm.
Each composite sample shall be targeted to contain at least 10 aliquots. Composite samples with
7 to 9 aliquots are acceptable if they meet the other sampling criteria and help achieve a
representative balance of wet season/dry season events and storm sizes.
Continuous flow recording of all storm events (not just sampled storm events) is necessary for at
least one complete water year to establish a baseline rainfall/runoff relationship. Ongoing
continuous flow monitoring is required for each of the sampled storm events as necessary to
properly conduct the flow-weighted composite sampling. Precipitation data shall be collected
from the nearest rain gauge reporting at least hourly rainfall amounts.
Grab samples are necessary for some parameters (see below) and shall be collected early in the
storm event. Refer to Standard Operating Procedure for Grab Sampling for Stormwater
Monitoring, ECY001 (http://www.ecy.wa.gov/programs/eap/quality.html).
Use of in-line sediment traps or similar collection system is preferred for sediment samples; refer
to Standard Operating Procedure for Collection of Stormwater Sediments using In-Line
Sediment Traps, ECY003 (http://www.ecy.wa.gov/programs/eap/quality.html).
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 4 of 14
Sediment samples shall be collected once per water year at each stormwater discharge
monitoring location, or in the vicinity of each stormwater monitoring location, during the month
of May or June.
Sampling of receiving water sediment deposits is an alternative where approved by Ecology.
Parameters
Flow-weighted composite samples shall be analyzed for the following parameters utilizing an
Ecology- or EPA-accredited laboratory and the methods and reporting limits as provided in table
A9-2 at the end of this appendix or otherwise approved by Ecology.
• Conventional parameters: total suspended solids (TSS), turbidity, conductivity, chloride,
biochemical oxygen demand (BOD5), hardness, pH, and methylene blue activating
substances (MBAS).
• Nutrients: total phosphorus, orthophosphate, total kjeldahl nitrogen, and nitrate plus
nitrite
• Metals, total and dissolved: copper, zinc, cadmium, lead, and mercury
• Organics:
o Polycyclic aromatic hydrocarbon (PAH) compounds: acenaphthene,
acenaphthylene, anthracene, benzo(a)anthracene, benzo(a)pyrene,
benzo(b)fluoranthene, benzo(ghi)perylene, benzo(k)fluoranthene, chrysene,
dibenzo(a,h)anthracene, fluoranthene, fluorene, indeno(1,2,3-cd)pyrene,
naphthalene, phenanthrene, and pyrene
o Herbicides: 2,4-D and dichlobenil
o Insecticides: carbaryl and chlorpyrifos
o Phthalates: bis(2-Ethylhexyl)phthalate
If the volume of the stormwater sample collected from a qualifying storm is insufficient to allow
analysis for all of the parameters listed above, the sample shall be analyzed for as many
parameters as possible in the following priority order: (1) metals and hardness; (2) TSS; (3)
organics: PAHs, herbicides, insecticides, phthalates; (4) nutrients; (5) conductivity; (6) BOD5;
and (7) remaining conventional parameters. If insufficient sample exists to run the next highest
priority pollutant, that analysis may be bypassed and analyses run on lower priority pollutants in
accordance with the remaining priority order to the extent possible. Parameters that are below
reporting limits after two years of data may be dropped from the analysis.
Grab samples shall be analyzed for the following parameters utilizing an Ecology- or EPA-
accredited laboratory and the methods and reporting limits listed in Table A9-2 at the end of this
Appendix.
• Fecal coliform bacteria
• Total petroleum hydrocarbons (TPH): NWTPH-Gx and NWTPH-Dx and BTEX
(benzene, toluene, ethyl -benzene, and xylenes).
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 5 of 14
Sediment samples shall be analyzed for the following parameters utilizing an Ecology- or EPA-
accredited laboratory and the methods and reporting limits listed in table A9-3 at the end of this
Appendix or otherwise approved by Ecology. If the volume of sediment sample is insufficient to
analyze for all of the parameters listed below, the sample shall be analyzed for as many
parameters as possible in the following priority order:
• Total organic carbon
• Metals: copper, zinc, lead, cadmium, and mercury
• Organics:
o PAH compounds: benzo(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene,
chrysene, 2,6-dimethylnaphthalene, 2-methylnaphthalene, fluoranthene,
naphthalene, benzo(ghi)perylene, phenanthrene, and pyrene
o Petroleum hydrocarbons: NWTPH-Dx
o Pyrethroids: bifenthrin
o PCBs: aroclors
• Total volatile solids
• Total phosphorus
• Percent solids, grain size
A minimum of one sediment sample per year shall be collected. Additional samples shall be
collected if insufficient sample exists from a single sample to run all of the organic pollutants
listed above. A visual, qualitative determination of grain size shall be reported for all samples (in
addition to the quantitative analysis for all samples with sufficient volume). Parameters that are
below reporting limits after two years of data may be dropped from the analysis.
Recordkeeping and Reporting
For each stormwater monitoring location, calculate the following:
• Event Mean Concentrations (EMCs)
• Total annual pollutant load by parameter
• Seasonal pollutant loads by parameter for the wet and dry seasons
The annual pollutant load calculations must be based on a water year and include wet and dry
season loads and total annual load (wet plus dry season load). The loadings shall be expressed as
total pounds and as pounds per acre, and must take into account potential pollutant load from
base flow. Loadings shall be calculated following Standard Operating Procedure for Calculating
Pollutant Loads for Stormwater Discharges, ECY004
(http://www.ecy.wa.gov/programs/eap/quality.html). Pollutant loading information is required
for water quality parameters only.
Annual Monitoring Reports shall be submitted with each Annual Report beginning with the first
Annual Report following the first full water year of monitoring. Annual Monitoring Reports shall
provide all monitoring data collected during the preceding water year (October 1 – September
30). Concentration data shall be provided in the same units that are specified for Reporting
Limits in Tables A9-2 and A9-3. Flow data shall be provided in gallons per minute. Loading data
for each water year shall be provided in total pounds and in pounds per acre. Annual Monitoring
Reports shall consist of a narrative report, an Excel spreadsheet with all data and pollutant
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 6 of 14
loading calculations, and a submittal to Ecology’s Environmental Information Management
(EIM) database. For the Annual Monitoring Report to be considered on time, the EIM data
submission process must be initiated before April 1 of each relevant year, and completed by June
15 of each relevant year.
Annual Monitoring Reports shall include:
• A brief summary of each monitored drainage basin (full details of the monitoring
drainage basin shall be in the QAPP), including any changes within the contributing
drainage area or changes to the monitoring station that could affect hydrology and/or
pollutant loading.
• A description of each flow-weighted composite and grab sampled storm event, including:
o General summary about storm event criteria, including:
Precipitation data (in inches) including antecedent dry period and rainfall
distribution throughout the event.
Flow and hydrograph data including sampled and total runoff time periods
and volumes.
Total number of qualifying storm events captured and analyzed at each
monitoring location.
Distribution of storms collected between wet and dry seasons (permit
goals include 60-80% of storms during the wet season and 20-40% of
storms during the dry season).
Logistical problems associated with any storm event criterion.
o A hyetograph and a hydrograph for each sampled storm event. Include properly
labeled graphs that display the following:
Date of the storm event.
Time of day versus precipitation information.
Time versus flow rate (in gallons per minute).
Time versus aliquot collection.
Display the total duration of the storm event, not just the duration when
samples were collected (remember your pollutant load calculation must
include flow for the entire storm event, not just the water quality sampled
portion).
o A summary of (or in the graph) the total runoff volume in gallons.
o A rainfall/runoff relationship table used to estimate the un-sampled storm events
(when water quality samples were not collected). This is used for future
estimations of annual and seasonal loads.
o Whether or not any chemicals were removed from the list of analysis due to two
years of non-detect data.
o A brief summary with storm event dates where insufficient volumes were
collected. Include the parameters analyzed.
• A description of the sediment sampling event, including:
o Whether or not any chemicals were removed from the list of analysis due to two
years of non-detect data.
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 7 of 14
o A summary of sediment sampling (including dates) where insufficient volumes
were collected. Include the parameters analyzed.
• Event Mean Concentrations (EMCs)
• The wet and dry season pollutant loads and annual pollutant load based on water year for
each discharge monitoring location expressed in total pounds, and pounds per acre.
Include the following:
o For storm events where water quality samples were collected, the load in pounds
per day for each parameter for each sampled storm event, include date of storm
events.
o An estimated seasonal pollutant load for each parameter at each discharge
monitoring location. This is calculated using all storm events (when water quality
samples were collected and when samples were not collected).
o A total annual pollutant load (wet season load + dry season load) for each
parameter (include estimated events).
o The rainfall/runoff relationship including your pollutant load estimates for un-
sampled events.
o Note that if any data is unavailable to effectively estimate your rainfall to runoff
relationship due to an incomplete water year, submit this information in the next
year’s stormwater monitoring report.
• Quality Assurance/Quality Control information for each successfully sampled qualifying
storm event at each discharge monitoring location and sediments sampled at each
discharge monitoring location, including:
o A narrative summary of your field and laboratory verification, validation results
and quality control checks performed.
o A narrative analysis of your field and laboratory quality control sample results
and how they compare with your data quality objectives/indicators in your QAPP.
o Corrective actions reported/taken.
• An explanation and discussion of results from each successfully sampled qualifying storm
event at each discharge monitoring location and sediments collected at each discharge
monitoring location, including:
o A statistical analysis of the event mean concentrations for each parameter and a
narrative description of significant findings from this analysis.
o Any conclusions based on data from this study including analyses of previously
collected data from these discharge monitoring locations.
• A description of Stormwater Management Program activities currently taking place or
planned within the monitoring station’s drainage area that may have affected or may
potentially affect future monitoring results.
If the Permittee monitors any pollutant more frequently at the stormwater discharge monitoring
locations, then the results of this monitoring shall be included in the annual monitoring report
reflecting the water year in which the monitoring occurred.
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 8 of 14
After three (3) water years of data, the Annual Monitoring Report shall include:
• Trend analyses,
• An evaluation of the data as it applies to the SWMP, and
• Any stormwater management activities the Permittee has identified that can be adjusted
to respond to this data.
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 9 of 14
Laboratory Methods
The Permittee’s stormwater discharge monitoring program shall use the following analytical
methods or other methods approved by the U.S. Environmental Protection Agency or Ecology
with similar reporting limits, unless alternative methods are approved by Ecology. Any
alternative method proposed by a Permittee must have a similar reporting limit, or must be
justified as adequate for the likely, expected range of concentrations. Permittees are not
guaranteed approval of alternative methods or reporting limits.
In cases where smaller volumes of water are expected to be collected, or to save analytical costs,
Permittees may propose that some of the analyses be optimized for specific parameters or
groups. The Permittee must, in consultation with a qualified chemist, define the exact volumes
and optimization steps and include them in the QAPP.
Table A9-2 Analytical Procedures in Stormwater
Analyte Method in Water Reporting
Limita
Conventional Parameters
Total suspended solids SM 2540Bb or SM 2540D 1.0 mg/L
Turbidity EPA Method 180.1 or SM2130B + 0.2 NTU
Conductivity SM 2510 or EPA Method 120.1 + 1 umhos/cm
Chloride EPA Method 300.0, EPA Method 325.2, or
SM4110B or SM4500 Cl-E 0.2 mg/L
BOD5 SM5210B 2.0 mg/L
Particle size distribution 1 Coulter Counter, Laser diffraction, or
comparable method - see attached method
NA
pH EPA Method 150.2 or SM 4500H+ 0.2 units
Hardness as CaCO3 EPA Method 200.7, SM2340B(ICP), SM2340C
(titration) or SM 3120B 1.0 mg/L
Methylene blue activated
substances (MBAS)
CHEMetrics Colorimetric or SM5540C 0.025 mg/L
Bacteria
Fecal Coliform SM 9221E 2 min., 2E6 max.
Nutrients
Orthophosphate and total
phosphorus
EPA Method 365.3, EPA Method 365.4, SM
4500-P E or SM4500-P F
0.01 mg P/L
Total Kjeldahl nitrogen EPA Method 351.2, EPA Method 351.1, SM
4500 Norg-B, SM 4500 Norg-C, SM 4500
NH3-D, SM 4500 NH3-G, SM 4500 NH3-E or
SM4500 NH3-F
0.5 mg/L
Nitrate-Nitrite EPA Method 353.2 or SM 4500 -NO3- E 0.01 mg/L
1 Particle size distribution is required only for monitoring sites that measure discharge from best management
practices.
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 10 of 14
Metals
Total recoverable zinc EPA Method 200.8 (ICP/MS), EPA Method
200.7 (ICP) or SM 3125 (ICP/MS)
5.0 µg/L
Dissolved zinc EPA Method 200.8 (ICP/MS), or SM 3125
(ICP/MS)
1.0 µg/L
Total recoverable lead EPA Method 200.8 (ICP/MS), or SM 3125
(ICP/MS)
0.1 µg/L
Dissolved lead, copper, and
cadmium EPA Method 200.8 (ICP/MS), or SM 3125
(ICP/MS)
0.1 µg/L
Total recoverable copper EPA Method 200.8 (ICP/MS), or SM 3125
(ICP/MS)
0.5 µg/L
Total recoverable cadmium EPA Method 200.8 (ICP/MS), or SM 3125
(ICP/MS)
0.2 µg/L
Total and dissolved mercury EPA Method 7470 (CVAA), EPA Method
245.7, or EPA Method 1631E
0.1 µg/L
Organics
PAH compounds EPA Method 8310 or 8270 D SIM 0.1 µg/L
Herbicides
(2,4-D, dichlobenil)
EPA Method 8270 D SIM or 8151 A 0.1 µg/L, 1 µg/L
Carbamate insecticides
(carbaryl)
EPA Method 632 0.5 µg/L
Organophosphate insecticides
(chlorpyrifos)
EPA Method 625 or EPA Method 614, 8270 D,
EPA Method 622, EPA Method 1657
0.5 µg/L
Phthalates
(bis(2-ethylhexyl)phthalate)
EPA Method 8270 D 1 µg/L
Petroleum Hydrocarbons
NWTPH-Dx Ecology, 1997, (Publication No. 97-602) 0.25-0.5 mg/L
NWTPH-Gx Ecology, 1997, (Publication No. 97-602) 0.25 mg/L
BTEX EPA Method 8260 or 602 1 µg/L or 5 µg/L
a. The QAPP shall identify Ecology- or EPA-approved methods with appropriate reporting limits. An individual
sample that could not be run at a reporting limit because of matrix interference or other such reasons would
not be called into question for compliance purposes. All results shall be reported. For non-detect values below
the reporting limit, report results at the method detection limit from the lab and the qualifier of “U” for
undetected at that concentration.
b. To ensure accurate results, Ecology recommends modifying these methods to analyze (filter) the entire field
sample. Research results indicate that errors may be introduced by decanting a subsample, although using a
funnel splitter may help. The analyst may also consider analyzing several premixed subsamples from the
same sample container to determine if significant variability occurred due to stratification. Reports shall
indicate whether the entire field sample or a subsample was used.
NA – Not applicable
SM – Standard Methods
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 11 of 14
Table A9-3 Analytical Procedures in Sediments
Analyte Method in Sediment Reporting
Limita
Conventional Parameters
Percent solids SM 2540G NA
Total organic carbon Puget Sound Estuary Protocols (PSEP 1997),
SM 5310B, SM 5310C, SM 5310D or EPA
Method 9060
0.1%
Grain size Sieve and Pipette (ASTM 1997), ASTM F312-
97, ASTMD422 or PSEP 1986/2003
NA
Total phosphorus EPA Method 365.3, EPA Method 365.4, SM
4500 P E or SM 4500 P F
0.01 mg/kg
Total volatile solids EPA Method 160.4 or SM 2540G 0.1%
Metals
Total recoverable zinc EPA Method 200.8 (ICP/MS), EPA Method
6010, EPA Method 6020 or SM 3125
(ICP/MS), or EPA Method 200.7 (ICP)
5.0 mg/kg
Total recoverable lead EPA Method 200.8 (ICP/MS), EPA Method
6010, EPA Method 6020 or SM 3125
(ICP/MS)
0.1 mg/kg
Total recoverable copper EPA Method 200.8 (ICP/MS), EPA Method
6010, EPA Method 6020 or SM 3125
(ICP/MS)
0.1 mg/kg
Total recoverable cadmium EPA Method 200.8 (ICP/MS), EPA Method
6010, EPA Method 6020 or SM 3125
(ICP/MS)
0.1 mg/kg
Total recoverable mercury EPA Method 245.5 or EPA Method 7471B 0.005 mg/kg
Organics
PAH compounds EPA Method 8270 D 70 µg/kg dry
Pyrethroids (bifenthrin) EPA Method 8270 D, EPA Method 1660 1.0 µg/kg dry
PCBs (aroclors) EPA Method 8082 80 µg/kg dry
Petroleum Hydrocarbons
NWTPH-Dx Ecology, 1997 (Publication No. 97-602) or
EPA SW-846 method 8015B
25.0-100.0 mg/kg
a. The QAPP shall identify Ecology- or EPA-approved methods with appropriate reporting limits. An individual
sample that could not be run at a reporting limit because of matrix interference or other such reasons would
not be called into question for compliance purposes. All results shall be reported. For non-detected values
below the reporting limit, report results at the method detection limit from the lab and the qualifier of “U” for
undetected at that concentration.
NA – Not applicable
SM – Standard Methods
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 12 of 14
WET SIEVING AND MASS MEASUREMENT
FOR LASER DIFFRACTION ANALYSIS
WET SIEVING
Sample Collection/Handling
Samples should be collected in HDPE or Teflon containers and held at 4 degrees C during the
collection process. If organic compounds are being collected, the sample containers should be
glass or Teflon.
Preservation/Holding Time
Samples should be stored at 4o C and must be analyzed within 7 days (EPA, 1998). Samples
may not be frozen or dried prior to analysis, as either process may change the particle size
distribution.
Sonication
Do not sonicate samples prior to analysis to preserve particle integrity and representativeness.
Laboratories using laser diffraction will have to be notified not to sonicate these samples at any
time during the analysis. It is recommended that this request also be written on the chain-of-
custody form that the analytical laboratory receives in order to assure that sonication is omitted.
LABORATORY PROCEDURES
Equipment
__ 2 Liters of stormwater sample water (total sample required for analysis (ASTM D 3977))
__ Drying oven (90 degrees C +2 degrees)
__ Analytical balance (0.01 mg accuracy)
__ Desiccator (large enough diameter to accommodate sieve)
__ Standard sieves - larger than 2" diameter may be desirable
__ 500 um (Tyler 32, US Standard 35)
__ 250 um (Tyler 60, US Standard 60)
__ Beakers - plastic (HDPE)
__ Funnel (HDPE - Large enough diameter to accommodate sieve)
__ Wash bottle
__ Pre-measured reagent-grade water
Sample Processing
• Dry 250 um and 500 um mesh sieves in a drying oven to a constant weight at 90 ± 2° C.
• Cool the sieves to room temperature in a desiccator.
• Weigh each sieve to the nearest 0.01 mg.
• Record the initial weight of each dry sieve.
• Measure the volume of sample water and record.
• Pour the sample through a nested sieve stack (the 500 um sieve should be on the top and the
sieve stack should be stabilized in a funnel and the funnel should be resting above/inside a
collection beaker).
• Use some of the pre-measured reagent-grade water in wash bottle to thoroughly rinse all soil
particles from sample container so that all soil particles are rinsed through the sieve.
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 13 of 14
• Thoroughly rinse the soil particles in the sieve using a pre-measured volume of reagent-grade
water.
• The particles that pass through the sieve stack will be analyzed by laser diffraction Particle
Size Distribution (PSD) analysis using the manufacturers recommended protocols (with the
exception of no sonication).
• Particles retained on the sieve (>250 um) will not be analyzed with the laser diffraction PSD.
• Dry each sieve (500 um and 250 um) with the material it retained in a drying oven to a
constant weight at 90 ± 2° C. The drying temperature should be less than 100° C to prevent
boiling and potential loss of sample (PSEP, 1986).
• Cool the samples to room temperature in a desiccator.
• Weigh the cooled sample with each sieve to the nearest 0.01 mg.
• Subtract initial dry weight of each sieve from final dry weight of the sample and sieve
together.
• Record weight of particles/debris separately for each size fraction (> 500 um and 499 - 250
um).
• Document the dominant types of particles/debris found in this each size fraction.
Laser Diffraction (PSD)
PSD results are reported in ml/L for each particle size range. Particle size gradations should
match the Wentworth grade scale (Wentworth, 1922).
Mass Measurement
Equipment
__ Glass filter - 0.45 um (pore size) glass fiber filter disk (Standard Method D 3977) (larger
diameter sized filter is preferable)
__ Drying oven (90 degrees C +2 degrees)
__ Analytical balance (0.01 mg accuracy)
__ Wash bottle
__ Reagent-grade water
Procedure
• Dry glass filter in drying oven at 90 ± 2° C to a constant weight.
• Cool the glass filter to room temperature in a desiccator.
• Weigh the 0.45 um glass filter to the nearest 0.01mg.
• Record the initial weight of the glass filter.
• Slowly pour the laser diffraction sample water (after analysis) through the previously
weighed 0.45 um glass filter and discard the water.
• Use reagent-grade water in wash bottle to rinse particles adhering to the analysis container
onto glass filter
• Dry glass filter with particles in a drying oven at 90 ± 2° C to a constant weight.
• Cool the glass filter and dried particles to room temperature in a desiccator.
• Weigh the glass filter and particles to the nearest 0.01mg.
• Subtract the initial glass filter weight from the final glass filter and particle sample weight.
• Record the final sample weight for particles <250 um in size.
Western Washington Phase II Municipal Stormwater Permit
_____________________________________________________________________________________________
August 1, 2013
Modified January 16, 2015 Appendix 9 – Stormwater Discharge Monitoring Page 14 of 14
Quality Assurance
Dried samples should be cooled in a desiccator and held there until they are weighed. If a
desiccator is not used, the particles will accumulate ambient moisture and the sample weight will
be overestimated. A color-indicating desiccant is recommended so that spent desiccant can be
detected easily. Also, the seal on the desiccator should be checked periodically, and, if necessary,
the ground glass rims should be greased or the "O" rings should be replaced.
Handle sieves with clean gloves to avoid adding oils or other products that could increase the
weight. The weighing room should not have fluctuating temperatures or changing humidity. Any
conditions that could affect results such as doors opening and closing should be minimized as
much as possible.
After the initial weight of the sieve is measured, the sieve should be kept covered and dust free.
Duplicate samples should be analyzed on 10% of the samples for both wet sieving and mass
measurements.
Reporting
Visual observations should be made on all wet sieved fractions and recorded. For example if the
very coarse sand fraction (2,000-1,000 um) is composed primarily of beauty bark, or cigarette
butts, or other organic debris this should be noted. An option might also be for a professional
geologist to record the geological composition of the sediment as well.
REFERENCES
ASTM. 1997. Standard test methods for determining sediment concentration in water samples.
Method D 3977. American Society for Testing and Materials, Philadelphia, PA.
PSEP. 1986. Recommended Protocols for measuring conventional sediment variables in Puget
Sound. Prepared by Tetra Tech, Inc. for U.S. Environmental Protection Agency and Puget
Sound Water Quality Authority. Tetra Tech Inc., Bellevue, WA.
U. S. EPA. 1998. Analysis of total suspended solids by EPA Method 160.2. Region 9, Revision
1. SOP 462. 12 pp
Wentworth, C.K. 1922. A scale of grade and class terms for clastic sediments. Journal of
Geology. 30:377-392
Comprehensive Storm Drainage Plan
B-1
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.
Auburn Drainage Plan Draft - Appendices.docx
Appendix B: Phase II NPDES Stormwater Permit
Compliance Work Plan
Phase II NPDES Municipal
Stormwater Permit
Compliance Work Plan
Prepared for the
City of Auburn, Washington
July 2, 2014
701 Pike Street, Suite 1200
Seattle, WA 98101
Phase II NPDES Municipal Stormwater Permit
Compliance Work Plan
Prepared for the
City of Auburn Washington
July 2 , 201 4
iii
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2014 Auburn NPDES Compliance Work Plan.docx
Table of Contents
List of Tables ....................................................................................................................................................... v
List of Abbreviations .......................................................................................................................................... vi
Executive Summary ........................................................................................................................................... 1
1. Introduction ............................................................................................................................................. 1-1
1.1 Overview and Background ........................................................................................................... 1-1
1.2 Schedule for Permit Compliance ................................................................................................. 1-1
1.3 Key Policy Issues........................................................................................................................... 1-2
1.3.1 LID Principles .................................................................................................................. 1-3
1.3.2 LID Infeasibility Criteria and Competing Needs ............................................................ 1-3
1.3.3 Manual Adoption ............................................................................................................ 1-3
1.3.4 Code Revisions ............................................................................................................... 1-3
1.3.5 LID Facility Inspections .................................................................................................. 1-4
1.3.6 Additional City Effort and Costs ..................................................................................... 1-4
1.4 Document Organization ................................................................................................................ 1-4
2. Stormwater Management Program Administration .............................................................................. 2-1
2.1 New Permit Requirements ........................................................................................................... 2-1
2.2 Current Compliance Activities Applicable to New Requirements .............................................. 2-1
2.3 Recommended Actions to Maintain Future Compliance ............................................................ 2-1
3. Public Education and Outreach .............................................................................................................. 3-1
3.1 New Permit Requirements ........................................................................................................... 3-1
3.2 Current Compliance Activities Applicable to New Requirements .............................................. 3-2
3.3 Compliance Policy Issues ............................................................................................................. 3-2
3.4 Recommended Actions to Maintain Future Compliance ............................................................ 3-2
4. Public Involvement .................................................................................................................................. 4-1
4.1 New Permit Requirements ........................................................................................................... 4-1
4.2 Current Compliance Activities Applicable to New Requirements .............................................. 4-1
4.3 Recommended Actions to Maintain Future Compliance ............................................................ 4-1
5. Illicit Discharge Detection and Elimination ............................................................................................ 5-1
5.1 New Permit Requirements ........................................................................................................... 5-1
5.2 Current Compliance Activities Applicable to New Requirements .............................................. 5-1
5.3 Recommended Actions to Maintain Future Compliance ............................................................ 5-1
6. Controlling Runoff from New Development, Redevelopment, and Construction Sites ...................... 6-1
6.1 New Permit Requirements ........................................................................................................... 6-1
6.2 Current Compliance Activities Applicable to New Requirements .............................................. 6-2
6.3 Compliance Policy Issues ............................................................................................................. 6-2
6.4 Recommended Actions to Maintain Future Compliance ............................................................ 6-3
7. Municipal Operations and Maintenance ............................................................................................... 7-1
Table of Contents Auburn NPDES Compliance Work Plan
iv
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2014 Auburn NPDES Compliance Work Plan.docx
7.1 New Permit Requirements ............................................................................................................7-1
7.2 Current Compliance Activities Applicable to New Requirements ...............................................7-1
7.3 Recommended Actions to Maintain Future Compliance ............................................................7-1
8. TMDL Compliance ....................................................................................................................................8-1
8.1 New Permit Requirements ............................................................................................................8-1
8.2 Current Compliance Activities Applicable to New Requirements ...............................................8-1
8.3 Recommended Actions to Maintain Future Compliance ............................................................8-1
9. Monitoring and Assessment ...................................................................................................................9-1
9.1 New Permit Requirements ............................................................................................................9-1
9.2 Current Compliance Activities Applicable to New Requirements ...............................................9-1
9.3 Recommended Actions to Maintain Future Compliance ............................................................9-1
10. Limitations ............................................................................................................................................. 10-1
11. References ............................................................................................................................................ 11-1
AWWDFKPHQW A: Permit Compliance Schedule (Draft) ..................................................................................... A-1
(Courtesy Cities of Covington and SeaTac) ............................................................................................ A-1
$WWDFKPHQW B: Compliance Effort Estimate .................................................................................................. B-1
$WWDFKPHQW C: Gap Analysis Table ..................................................................................................................C-1
Auburn NPDES Compliance Work Plan Table of Contents
v
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2014 Auburn NPDES Compliance Work Plan.docx
List of Tables
Table 1-1. Summary Compliance Schedule .................................................................................................. 1-2
Table 2-1. Stormwater Management Program Administration .................................................................... 2-2
Table 3-1. Public Education and Outreach .................................................................................................... 3-2
Table 4-1. Public Involvement ........................................................................................................................ 4-1
Table 5-1. Illicit Discharge Detection and Elimination .................................................................................. 5-2
Table 6-1. Controlling Runoff from Development, Redevelopment, and Construction Sites ..................... 6-3
Table 6-2. Recommended City Code and Document Updates (Development-Related) ............................. 6-4
Table 7-1. Municipal Operations and Maintenance ..................................................................................... 7-2
Table 8-1. TMDL Compliance ......................................................................................................................... 8-2
Table 9-1. Monitoring and Assessment ......................................................................................................... 9-1
Table of Contents Auburn NPDES Compliance Work Plan
vi
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2014 Auburn NPDES Compliance Work Plan.docx
List of Abbreviations
ACC Auburn City Code
BMP best management practice
City City of Auburn
CMMS computerized maintenance
management system
Ecology Washington State Department of
Ecology
Ecology Manual 2012 Stormwater Management
Manual for Western Washington
EPA U.S. Environmental Protection
Agency
GMA Growth Management Act
HR Human Resources Department
IDDE Illicit Discharge Detection and
Elimination
IT Information Technology
Department
LID low-impact development
MS4 municipal separate storm sewer
system
NPDES National Pollutant Discharge
Elimination System
O&M operations and maintenance
M&O City of Auburn Maintenance and
Operations Division
Permit NPDES Phase II Municipal
Stormwater Permit
RSMP Regional Stormwater Monitoring
Program
SIDIR Source Identification Information
Repository
SOP standard operating procedure
STORM Stormwater Outreach for Regional
Municipalities
SWMM City of Auburn Surface Water
Management Manual (November
2009)
SWMP Stormwater Management Program
SWPPP Stormwater Pollution Prevention
Plan
TMDL total maximum daily load
ES-1
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2014 Auburn NPDES Compliance Work Plan.docx
Executive Summary
On August 1, 2012, the Washington State Department of Ecology (Ecology) reissued the National
Pollutant Discharge Elimination System (NPDES) Phase II Municipal Stormwater Permit (Permit) to
comply with requirements of the federal Clean Water Act. The new Permit became effective August 1,
2013, through July 31, 2018. The City of Auburn (City) will be required to pursue updates to the Auburn
City Code (ACC) and to City stormwater standards based on the requirements of this new NPDES Permit.
Maintaining compliance is important for the City for the following reasons:
Requirements of the Permit are intended to result in more “fishable, swimmable waters.”
Ecology has the power to levy fines or impose criminal penalties for noncompliance.
Grant funds may be affected by noncompliance.
Noncompliance with the Permit and the Clean Water Act can expose the City to third-party litigation.
Some of the most significant changes to the Permit include:
Requirements to evaluate City codes, standards, and policies and to incorporate low-impact
development (LID) principles, making LID the preferred way of managing stormwater runoff from
future development and redevelopment
Revised stormwater facility requirements for new development and redevelopment, which are more
intensive and will affect more projects, including single-family dwellings
Requirements for new and more frequent inspections of permanent stormwater infrastructure,
including small LID facilities to be constructed on virtually all private property over time
Requirement to pay for participation in Ecology water quality monitoring programs, or to conduct
equivalent programs independently
The updated Permit requirements may affect the City in a number of ways, including potential impacts
to:
City codes, standards, policies, and requirements, affecting both public and private activities.
Potentially impacted codes include ACC 13.48 and other development-related sections. The degree
of impact in other areas of the ACC (e.g., development regulation, transportation, zoning, etc.) will be
related to the outcome of the City’s LID principles review process. Updates to City standards and
guidance documents will also be required, including the City Surface Water Management Manual
(SWMM) and Engineering Design Standards. The new Permit requirements may also create
potential policy and public-relations issues related to access of private property for City-conducted
inspections and enforcement actions.
Staff effort for ongoing Permit compliance activities, including efforts to conduct the required LID
evaluation process; develop, adopt, and enforce code, standard, and policy updates; and conduct
new and more frequent inspections. Annual effort for City inspectors will increase over time as more
facilities are constructed, each of which must then be inspected in perpetuity.
City expense for potential additional staffing needs, capital improvement projects, and payments for
monitoring program participation. Staffing needs may increase as a result of increased compliance
efforts and field inspection requirements. Additional capital improvement project funding may be
required to incorporate required stormwater facilities into future City capital improvement projects.
Stormwater monitoring program participation includes annual payments of approximately $48,000
from the City to Ecology.
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Developers and the general public, which may face additional costs and effort for many
development projects, including individual single-family residential projects.
The City is actively planning and preparing to comply with the updated Permit requirements, including
development of this Compliance Work Plan for compliance activities. The City will continue this Permit
compliance preparation with reviews of codes, policies, and standards, and will begin to implement new
requirements, including making the first annual payment to participate in Ecology’s monitoring
programs.
Over the 5-year term of the Permit, the City will conduct a variety of activities to update City codes,
standards, and policies, and to carry out this Compliance Work Plan consistent with regulatory schedule
deadlines. Activities involving significant resource allocation will include:
Conducting a process to review and incorporate LID principles into City codes, standards, and
policies
Developing and adopting updates to codes and other City documents, including the City
Comprehensive Plan
Developing and adopting updates to the Surface Water Management Manual (SWMM), or adopting
an alternative manual
Communicating new development requirements to the building industry and the public, and
enforcing new requirements
Funding construction of new stormwater facilities associated with City capital improvements and
providing for long-term maintenance of those facilities and other facilities accepted for maintenance
by the City
Developing and implementing updates to the City’s Public Education and Outreach, Illicit Discharge
Detection and Elimination (IDDE), and Operations and Maintenance (O&M) programs
Scheduling and conducting new and more frequent inspections of permanent stormwater
infrastructure, or providing Ecology with justification for less frequent inspections
Making annual payments to participate in the Ecology monitoring program
Compliance with total maximum daily load (TMDL) requirements
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Section 1
Introduction
1.1 Overview and Background
The National Pollutant Discharge Elimination System (NPDES) permit program is a requirement of the
federal Clean Water Act that is intended to protect and restore waters for “fishable, swimmable” uses.
The City of Auburn (City) is one of more than a hundred jurisdictions in Washington that has obtained,
and is currently in compliance with, a municipal stormwater discharge permit for “small” municipalities
(i.e., under 100,000 in population according to the 1990 census). This group of permittees is considered
to have “Phase II Permits,” with larger municipalities regulated by “Phase I Permits.”
These permits allow municipalities to discharge stormwater runoff from municipal drainage systems into
the state’s water bodies (i.e., streams, rivers, lakes, wetlands, etc.) as long as the municipalities have
programs that protect or minimize impacts to water quality as required by the Permit conditions.
Compliance deadlines for implementation of the Permit conditions are phased in over the 5-year Permit
term. The Washington State Department of Ecology (Ecology), as the delegated authority by the U.S.
Environmental Protection Agency (EPA), is to revise and reissue these permits every 5 years.
On August 1, 2012, Ecology reissued the NPDES Phase II Municipal Stormwater Permit (Permit),
effective August 1, 2013, through July 31, 2018. As a Phase II Permittee, the City will be required to
pursue updates to the Auburn City Code (ACC) and stormwater standards based on the requirements of
this new NPDES Permit.
The purpose of this Compliance Work Plan is to identify and make recommendations regarding the key
changes and activities that should take place over the next 5 years for the City to comply with the
updated Permit requirements. This identification includes:
Required compliance schedule deadlines
Recommended updates and activities, organized by applicable Permit section
Interim deadlines and activities for completing groups of similar tasks
Refer to the Phase II Gap Analysis Technical Memorandum, dated February 28, 2014, for details of the
Permit requirements and identification of potential Permit compliance gaps in City codes, standards, and
policies.
1.2 Schedule for Permit Compliance
A number of due dates for City Stormwater Management Program (SWMP) activities are included in the
updated Permit. Key Permit requirement due dates are summarized in Table 1-1.
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Table 1-1. Summary Compliance Schedule
Compliance activity Due date
Continue annual inspections of any onsite stormwater facilities approved by
the City for construction under the terms of the 2007–12 Permit or
subsequent Permits.
Ongoing
Communicate to Ecology whether the City will participate in the collective
fund for Monitoring and Assessment, or conduct stormwater monitoring
activities independently.
December 1, 2013 (completed)
Post SWMP documents to Web site annually. May 31 annually, starting 2014 (completed & ongoing)
Review and update interdepartmental coordination mechanisms, if needed. March 31, 2015 (completed)
Update public outreach and education materials. August 1, 2015
Measure effectiveness of public outreach for at least one target audience and
subject area (may be as part of a regional effort). February 2, 2016
Review and update City operations, maintenance, and inspection standards,
if needed. December 31, 2016
Adopt a new stormwater management manual: either the 2012 Stormwater
Management Manual for Western Washington (Ecology Manual) or an
approved equivalent.
December 31, 2016
Review, revise, and adopt local development codes, standards, and policies
to require low-impact development (LID) principles and LID best
management practices (BMPs), and to reflect deletion of the less than 1-acre
onsite stormwater facilities requirement exemption. The Permit requires a
specific process to be followed in considering revisions. This revision process
may involve revisions to a variety of potentially affected ACC sections.
December 31, 2016
Compile and submit a summary of the LID review and revision process. March 31, 2017
Complete one inspection of each catch basin, including documentation and
reporting.
August 1, 2017, and at least every
2 years thereafter
Complete field screening for 40% of the system by 2018, and 12% annually
thereafter.
December 31, 2017, annually
thereafter
Revise codes to reflect Illicit Discharge Detection and Elimination (IDDE)
changes in the Permit. February 2, 2018
1.3 Key Policy Issues
Over the 5-year Permit term, Auburn will need to address several significant policy issues affecting
multiple departments. The major policy issues associated with the updated Permit generally align with
the following categories:
Low-impact development (LID) principles assessment, policy development, implementation, and
reporting
LID infeasibility criteria and competing needs
Updates to the City Surface Water Management Manual (SWMM) or adoption of alternative manual
Code revisions
LID facility inspections
Additional City effort and costs
Major policy issues are described in the following sections.
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1.3.1 LID Principles
The revised Permit requires that development-related codes, standards, and enforcement be revised to
implement LID principles, including minimizing impervious surfaces, native vegetation loss, and
stormwater runoff. The requirement to minimize impervious areas poses regulatory challenges and may
have significant policy implications for Permittee interests outside of stormwater management.
Examples of potential policy conflicts might include preserving areas of existing vegetation and reducing
impervious surface areas vs. meeting parking requirements or roadway width standards.
The City will need to complete an assessment of LID principles related to various City codes, develop
policies for LID implementation, and report on the process to Ecology. The Puget Sound Partnership’s
Integrating LID into Local Codes: A Guidebook for Local Governments is a reference guidebook intended
by Ecology to be used in this policy development process.
1.3.2 LID Infeasibility Criteria and Competing Needs
The revised Permit allows local programs to identify LID infeasibility and competing needs criteria. These
could include infeasibility criteria for considerations like critical areas (e.g., steep slopes, slide-prone
areas, protected aquifers, and floodplains) or areas otherwise unsuitable for infiltration (e.g., areas with
seasonally high groundwater or low soil permeability). They could also include potentially conflicting
regulations (e.g., Growth Management Act [GMA] requirements), or local requirements (e.g.,
transportation or community planning considerations). It may be that infeasibility and competing needs
criteria can give local jurisdictions more flexibility; however, the criteria may also require additional
updates to the ACC and City policies. This issue may have significant policy implications for Permittee
interests outside of stormwater management.
1.3.3 Manual Adoption
Another key policy decision relates to adoption of a new manual for management of stormwater from
construction and new development and redevelopment sites. The Permit requires each Permittee to
adopt the 2012 Stormwater Management Manual for Western Washington (Ecology Manual) or an
equivalent manual approved by Ecology.
The City has several options related to adoption of a stormwater manual. During the previous Permit
cycle, the City developed the City-specific SWMM, based on the 2008 City of Tacoma manual. In order to
comply with updated Permit requirements, the City can choose one of three options:
Update the Auburn SWMM
Adopt the Ecology Manual
Adopt another Phase I jurisdiction’s equivalent manual (no local jurisdiction manuals are currently
approved as equivalent by Ecology, but achieving equivalency by at least some of the Phase I
Permittees is likely)
1.3.4 Code Revisions
City codes will require an update to comply with the new Permit requirements. The following major
changes will be required:
Updates to Chapter 13.48 (Storm Drainage Utility) and related sections to reflect updated definitions
and requirements for Illicit Discharge Detection and Elimination (IDDE), development activities, and
LID
Other updates to various City codes as identified during the LID Principles assessment process
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1.3.5 LID Facility Inspections
The previous Permit included requirements to conduct annual inspections for all permanent stormwater
best management practices (BMPs)/facilities permitted in accordance with the requirements of this
Permit. The requirements for inspections now include LID and facilities constructed on private
property. With the deletion of the 1-acre threshold exemption, this requirement takes on new
significance. With new development and redevelopment, virtually all properties will have the potential to
have an inspection requirement over time. The scale of required inspections and the requirement to
inspect on private property may pose challenges.
Increased presence of inspectors on private property and increased costs associated with inspections
represent policy issues that City officials may want to consider (e.g., options to fund inspections,
perceptions of increasing City authority, etc.).
1.3.6 Additional City Effort and Costs
The Permit will require additional activities that will grow over the 5-year Permit term. The City must
decide how to staff and fund the required new activities. See Attachment B for a preliminary estimate of
City effort and costs to comply with new Permit requirements.
1.4 Document Organization
The remainder of this Compliance Work Plan is organized similarly to the Permit:
Section 2 addresses compliance with the Permit requirements for administration of the City’s
Stormwater Management Program
Section 3 presents a compliance work plan for Public Education and Outreach
Section 4 presents a compliance work plan for Public Involvement and Participation
Section 5 presents a compliance work plan for Illicit Discharge Detection and Elimination
Section 6 presents a compliance work plan for Controlling Runoff from New Development,
Redevelopment, and Construction Sites
Section 7 presents a compliance work plan for Municipal Operations and Maintenance
Section 8 presents a compliance work plan for TMDL requirements
Section 9 presents a compliance work plan for Monitoring and Assessment
A ttachment A includes a schedule of due dates for new requirements
A ttachment B includes a compliance effort estimate developed to help the City identify staffing and
funding needs related to new Permit requirements
A ttachment C includes a gap analysis table developed to assess changes in the Permit and
corresponding impacts on City codes, standards, and activities
Each section includes a summary of new Permit requirements, current compliance activities that are
applicable to the new requirements, discussion of policy and compliance strategy issues (if applicable),
and recommended actions to maintain future compliance. For additional details on requirements and
recommended activities, see the Gap Analysis Table in Attachment C.
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Section 2
Stormwater Management Program
Administration
This section summarizes new Permit requirements for SWMP administration, current compliance
activities that are applicable to the new requirements, and recommended actions to maintain future
compliance.
2.1 New Permit Requirements
Sections S5.A, S7.A, and S9.A of the Permit include the following new requirements:
The SWMP shall include coordination mechanisms among departments within each jurisdiction to
eliminate barriers to compliance with the terms of this Permit. Permittees shall include a written
description of internal coordination mechanisms in the Annual Compliance Report, due no later than
March 31, 2015.
Each Annual Compliance Report shall include a summary of relevant SWMP and Appendix 2
activities conducted in the total maximum daily load (TMDL) area to address the applicable TMDL
parameter(s).
Permittees shall submit Annual Compliance Reports electronically using Ecology’s WQWebDMR
available on Ecology’s Web site at
http://www.ecy.wa.gov/programs/wq/permits/paris/webdmr.html unless otherwise directed by
Ecology. The first Annual Compliance Report will be due March 31, 2015, covering activities for
2014.
2.2 Current Compliance Activities Applicable to New Requirements
Current City compliance activities applicable to updated requirements of Sections S5.A, S7.A, and S9.A
include:
The City coordinates and tracks stormwater management activities and compliance across multiple
City departments.
The City completes and submits Annual Compliance Reports by March 31 annually.
2.3 Recommended Actions to Maintain Future Compliance
Auburn is compliant with the Permit requirements that are currently in effect. Additional requirements
will take effect during the next 4 years. Table 2-1 lists activities and time frames for the City to comply
with new Permit conditions related to SWMP administration.
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Table 2-1. Stormwater Management Program Administration
Task ID Task description Lead Support Compliance time frame
SWMP-2
Build on existing annual reporting task in 2014 SWMP; use
updated electronic template to complete and submit
annual reports
Utilities
Engineering None
Annual Compliance Report is due
by March 31 of each year beginning
in 2015
SWMP-3 Include a written description of internal coordination
mechanisms in the 2014 Annual Compliance Report
Utilities
Engineering
HR, M&O, Permit
Center,
Development
Engineering
Due March 31, 2015 (completed)
SWMP-4
Include summary of relevant SWMP and Appendix 2
activities related to applicable TMDLs in Annual Compliance
Report
Utilities
Engineering None Ongoing
Note: Task ID numbering and work items build on tasks currently included in the 2014 SWMP.
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Section 3
Public Education and Outreach
This section summarizes new Permit requirements for Public Education and Outreach, current
compliance activities that are applicable to the new requirements, discussion of policy and compliance
strategy issues, and recommended actions to maintain future compliance.
3.1 New Permit Requirements
Section S5.C.1 of the Permit requires the City to conduct the following activities:
Educate the general public (including school-age children) and businesses (including home-based
and mobile businesses) about several new areas, including:
Impacts of illicit discharges and how to report them
LID principles and LID BMPs
Opportunities to become involved in stewardship activities
Equipment maintenance
Prevention of illicit discharges
Educate engineers, contractors, developers, and land use planners about several new areas,
including:
Technical standards for stormwater construction site and erosion control plans
LID principles and LID BMPs
Stormwater treatment and flow control BMPs/facilities
Educate residents, landscapers, and property managers/owners about several new areas, including:
Use and storage of household chemicals
Vehicle, equipment, and home/building maintenance
Pet waste management disposal
LID principles and LID BMPs
Dumpster and trash compactor maintenance
Create stewardship opportunities and/or partner with existing organizations to encourage residents
to participate in activities such as stream teams, storm drain marking, volunteer monitoring, riparian
plantings, and education activities.
Measure the understanding and adoption of the targeted behaviors for at least one target audience
in at least one subject area. No later than February 2, 2016, Permittees shall use the resulting
measurements to direct education and outreach resources most effectively, as well as to evaluate
changes in adoption of the targeted behaviors. Permittees may meet this requirement individually or
as a member of a regional group.
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3.2 Current Compliance Activities Applicable to New Requirements
Current City compliance activities applicable to updated requirements include:
The City conducts numerous education and outreach activities that address stormwater
management targeted to the general public, residents/homeowners, and some industries.
The City is participating in a regional effort to develop effective ways to track and measure the
effectiveness of its education and outreach efforts.
The City tracks its education and outreach efforts.
The City is providing stewardship opportunities such as planting native plants and removing invasive
species at the Auburn Environmental Park.
3.3 Compliance Policy Issues
Measuring changes in understanding or behavior is a challenging objective. City representatives are
participating in a cooperative effort with several other NPDES municipalities to explore efficient and
effective methods to meet the Permit requirements for its public education and outreach program
evaluation.
3.4 Recommended Actions to Maintain Future Compliance
Auburn has a broad public education and outreach program but will need to update the program to
maintain compliance as the Permit requirements take effect. Table 3-1 lists activities and time frames
for the City to comply with new Permit conditions related to public education and outreach.
Table 3-1. Public Education and Outreach
Task ID Task description Lead Compliance time frame
EDUC-1
Build on collaboration with the Stormwater Outreach for
Regional Municipalities (STORM) group and Puget
Sound Starts Here efforts to identify and implement
programs to measure the understanding and adoption
of targeted behaviors for at least one target audience,
and adjust programming as needed
Utilities Engineering February 2, 2016
EDUC-3
Implement new or modify existing education and
outreach activities relative to new target
audiences/topics identified by the Permit
Utilities Engineering Ongoing
EDUC-6 Provide stewardship opportunities for the public Community Development
and Public Works, Parks Ongoing
Note: Task ID numbering and work items build on tasks currently included in the 2014 SWMP.
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Section 4
Public Involvement
This section summarizes new Permit requirements for Public Involvement, current compliance activities
that are applicable to the new requirements, and recommended actions to maintain future compliance.
4.1 New Permit Requirements
Section S5.C.2 of the Permit requires the City to:
Post on its Web site its SWMP Plan and the Annual Compliance Report required under S9.A no later
than May 31 of each year. All other submittals shall be available to the public upon request.
4.2 Current Compliance Activities Applicable to New Requirements
The City currently has activities and programs relevant to the Public Involvement requirement. These
activities are summarized below:
The City makes the SWMP document and Annual Compliance Report available to the public on the
City Web site.
4.3 Recommended Actions to Maintain Future Compliance
Auburn is on track for compliance with new Public Involvement requirements. Table 4-1 lists activities
and time frames for the City to comply with new Permit conditions related to Public Involvement.
Table 4-1. Public Involvement
Task ID Task description Lead Compliance time frame
PI-2 Define public involvement opportunities for annual SWMP
update and reporting process.
Utilities
Engineering
Continue to post to Web site; note the May
31 deadline for annual posting starting in
2014
Note: Task ID numbering and work items build on tasks currently included in the 2014 SWMP.
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Section 5
Illicit Discharge Detection and
Elimination
This section summarizes new Permit requirements for Illicit Discharge Detection and Elimination, current
compliance activities that are applicable to the new requirements, and recommended actions to
maintain future compliance.
5.1 New Permit Requirements
The Permit (Section S5.C.3) requires the City to:
Require thermal control of discharges from swimming pools, spas, and hot tubs.
Include informal compliance actions as an element of the City’s enforcement strategy.
Revise the City’s IDDE ordinance or regulatory mechanisms if necessary to meet the requirements of
this section no later than February 2, 2018.
Implement a field screening methodology appropriate to the characteristics of the municipal
separate storm sewer system (MS4) and water quality concerns. Screening for illicit connections
may be conducted using Illicit Discharge Detection and Elimination: A Guidance Manual for Program
Development and Technical Assessments, Center for Watershed Protection, October 2004, or
another methodology of comparable or improved effectiveness.
Document the field screening methodology in the relevant Annual Compliance Report.
Complete field screening for at least 40 percent of the MS4 no later than December 31, 2017, and
on average 12 percent each year thereafter.
5.2 Current Compliance Activities Applicable to New Requirements
The City currently has activities and programs relevant to IDDE requirements. These activities are
summarized below:
City codes and standards address illicit discharges.
The City conducts annual dry weather screening for illicit discharges and connections.
5.3 Recommended Actions to Maintain Future Compliance
Auburn has an established IDDE program, but will need to make some updates in order to maintain
compliance as new Permit requirements take effect. Table 5-1 lists activities and time frames for the City
to comply with new Permit conditions related to IDDE.
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Table 5-1. Illicit Discharge Detection and Elimination
Task ID Task description Lead Support Compliance time frame
IDDE-4
Complete updates to IDDE requirements in ACC 13.48
(e.g., updated Permit definitions and allowable
discharges).
Utilities Engineering M&O, City
Attorney February 2, 2018
IDDE-5
Complete updates to City standards and standard
operating procedures (SOPs) reflecting any modified
policies or activities.
Utilities Engineering M&O February 2, 2018
IDDE-6 Update public outreach and/or construction permitting
materials related to IDDE updates, if needed. Utilities Engineering
Permit
Center,
Development
Engineering
February 2, 2018
IDDE-7 Review policies and activities related to IDDE source control
(updated Ecology Manual BMPs) for potential update. Utilities Engineering None February 2, 2018
IDDE-8
Update the City’s screening methodology if desired
(optional). The prior Permit required outfall screening—the
2013 Permit allows greater flexibility, including in-system
screening. Permittees may continue to screen outfalls, or
begin screening in-system instead.
Develop local strategy/definition for 40% screening
coverage. Update SWMP with details of screening
methodology.
Utilities Engineering M&O
Establish early enough to
meet December 31, 2017
compliance targets
IDDE-9
Complete field screening using selected methodology,
including 40% of the City stormwater system by the end of
2017, and 12% of the system annually thereafter.
M&O Utilities
Engineering
December 31, 2017,
annually thereafter
Note: Task ID numbering and work items build on tasks currently included in the 2014 SWMP.
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Section 6
Controlling Runoff from New
Development, Redevelopment, and
Construction Sites
This section summarizes new Permit requirements for Controlling Runoff from New Development,
Redevelopment, and Construction Sites; current compliance activities that are applicable to the new
requirements; discussion of policy and compliance strategy issues; and recommended actions to
maintain future compliance.
6.1 New Permit Requirements
The Permit (Section S5.C.4) requires the City to:
Apply program requirements to construction sites disturbing less than an acre (removed the 1-acre
threshold for construction project exemption from many S5.C.4 requirements).
Update the City’s codes, standards, and programs to reduce pollutants in stormwater from new
development, redevelopment, and construction site activities, consistent with the updated minimum
technical requirements of the Permit, Appendix 1, and the 2012 Ecology Manual, including:
Updated definitions
Modified project thresholds
Updated Minimum Requirements, including incorporation of LID elements
Significantly updated Minimum Requirement 5, with new BMP lists and an LID Performance
Standard for onsite stormwater management
New and updated BMPs and requirements in the 2012 Ecology Manual
Adopt the 2012 Ecology Manual or an equivalent stormwater manual, or update the Auburn SWMM
consistent with the updated minimum technical requirements in Appendix 1 of the Permit.
Establish the legal authority, through the approval process for new development and redevelopment,
to inspect and enforce maintenance standards for private stormwater facilities approved under the
provisions of this section that discharge to the Permittee’s MS4.
Ensure that the program includes provisions to verify adequate long-term operations and
maintenance (O&M) of stormwater treatment and flow control BMPs/facilities that are permitted
and constructed pursuant to the City’s permitting process under the Permit.
Inspect all permanent stormwater treatment and flow control BMPs/facilities and catch basins in
new residential developments every 6 months until 90 percent of the lots are constructed (or when
construction is stopped and the site is fully stabilized) to identify maintenance needs and enforce
compliance with maintenance standards as needed.
Comply with inspection requirements of this section by achieving at least 80 percent of scheduled
inspections.
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Review, revise, and make effective its local development-related codes, rules, standards, or other
enforceable documents to incorporate and require LID principles and LID BMPs.
The intent of the revisions shall be to make LID the preferred and commonly used approach to
site development. The revisions shall be designed to minimize impervious surfaces, native
vegetation loss, and stormwater runoff in all types of development situations. Permittees shall
conduct a similar review and revision process, and consider the range of issues, outlined in the
following document: Integrating LID into Local Codes: A Guidebook for Local Governments
(Puget Sound Partnership, 2012).
Submit a summary of the results of the review and revision process described above with the Annual
Compliance Report due no later than March 31, 2017. This summary shall include, at a minimum, a
list of the participants (job title, brief job description, and department represented); the codes, rules,
standards, and other enforceable documents reviewed; and the revisions made to those documents
that incorporate and require LID principles and LID BMPs. The summary shall include existing
requirements for LID principles and LID BMPs in development-related codes. The summary shall be
organized as follows:
a. Measures to minimize impervious surfaces
b. Measures to minimize loss of native vegetation
c. Other measures to minimize stormwater runoff
Participate in watershed-scale stormwater planning if a watershed is partially or fully located in Auburn
is selected by a Phase I county for watershed-scale stormwater planning under condition S5.C.4.c of
the Phase I Municipal Stormwater General Permit. (The City may be required to provide data,
mapping, and “monitoring locations,” and participate in “development of strategies to prevent future
and address existing impacts”.)
6.2 Current Compliance Activities Applicable to New Requirements
The City currently has activities and programs that meet many of the Permit requirements summarized
above. The current compliance activities associated with the above Permit requirements include:
The City has existing programs, codes, and standards that address many of the Permit requirements
for management of stormwater runoff from development, redevelopment, and construction sites.
The City reviews all stormwater site plans for proposed development. The City currently implements
the Auburn SWMM as an equivalent manual approved by Ecology.
The City has a site planning process for BMP selection and design criteria.
The City inspects all permitted development sites during construction and after construction.
The City clearly identifies the party responsible for O&M and requires long-term O&M of permitted
facilities and BMPs.
The City records inspections and enforcement actions by staff.
6.3 Compliance Policy Issues
Compliance with Permit Condition S5.C.4 will require the City to address the following key issues:
See Section 1.3 for discussion of key policy issues related to controlling runoff from new
development, redevelopment, and construction sites, including:
LID principles assessment, policy development, implementation, and reporting
LID infeasibility criteria and competing needs
Updates to SWMM or adoption of an alternative manual
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Code revisions
LID facility inspections
6.4 Recommended Actions to Maintain Future Compliance
Auburn has a well-developed program to help reduce stormwater runoff from new development,
redevelopment, and construction sites but significant updates will be necessary to maintain compliance
with new Permit requirements. Table 6-1 lists activities and time frames for the City to comply with new
Permit conditions related to control of runoff from new development, redevelopment, and construction
sites.
Table 6-1. Controlling Runoff from Development, Redevelopment, and Construction Sites
Task ID Task description Lead Support Compliance time frame
CTRL-3
Begin process to update City codes related to
controlling runoff from new development,
redevelopment, and construction site
projects (e.g., ACC 13.48 and planning-
related code sections: see Table 6-2 for
potentially affected City codes).
Utilities Engineering,
Building Division City Attorney December 31, 2016
CTRL-4
Begin a process to develop and adopt a
stormwater management manual equivalent
to the 2012 Ecology Manual.
Utilities Engineering
Community Development
and Public Works, City
Attorney
December 31, 2016
CTRL-5
Begin process to review, revise, and make
effective development-related codes, rules,
standards, or other enforceable documents
to incorporate and require LID principles and
LID BMPs. See Table 6-2 for potentially
affected City documents.
Utilities Engineering,
Planning Division
Permit Center,
Development Engineering,
City Attorney
December 31, 2016
CTRL-6 Implement updated codes, manual, and
standards.
Utilities Engineering,
Permit Center,
Development
Engineering, Planning
M&O After adoption, no later
than January 1, 2017
CTRL-7
Consider updates to public outreach and
communications materials for property
owners related to increased potential for
annual stormwater facility inspections on
private property.
Utilities Engineering Permit Center Ongoing
CTRL-8
Update inspection requirements for
residential developments (inspect every 6
months until 90% buildout).
Construction Inspectors None Ongoing
CTRL-9
Complete and document 80% of scheduled
O&M and construction inspections to
demonstrate compliance.
Utilities Engineering,
Construction Inspectors,
Building Inspectors,
M&O
None Ongoing
CTRL-10
Compile and submit a summary of the LID
review and revision process described in
CTRL-5
Utilities Engineering Planning Division March 31, 2017
Note: Task ID numbering and work items include and build on tasks currently included in the 2014 SWMP.
Section 6 Auburn NPDES Compliance Work Plan
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Table 6-2 is adapted from the Phase II Gap Analysis technical memorandum dated February 28, 2014. It
includes assessments of City codes, standards, and other documents that may require update to comply
with updated Permit requirements related to control of runoff from new development, redevelopment,
and construction sites. In general, the LID principles requirements may affect provisions of
Comprehensive Plan goals and policies, land use and development code provisions, and development
standards.
Table 6-2. Recommended City Code and Document Updates (Development-Related)
City document Sections/descriptions Comments
Auburn City Code (ACC) sections
Title 1 General Provisions Chapter 1.20 Right of Entry for Inspection
Chapter 1.25 Civil Penalties for Violations
These sections were reviewed because of their relationship to
facility inspection and enforcement.
1.20: The language in this section appears to be adequate. The
City may wish to review further in the context of a broader
strategy/approach for conducting inspections of LID facilities
on private property.
1.25: No changes appear necessary.
Title 2 Administration and
Personnel
Chapter 2.25 Planning and Development
Department
Chapter 2.27 Public Works Department
These sections were reviewed because of their potential
relationship to stormwater program implementation.
No changes appear necessary.
Title 8 Health and Safety Chapter 8.20 Vegetation
This section was reviewed because of its potential relationship
to maintenance of vegetation in private stormwater facilities.
The City will likely address O&M requirements for private
stormwater facilities elsewhere; no apparent change is required.
Title 12 Streets, Sidewalks and
Public Works Chapter 12.04 Public Works Construction 12.04.010: Update SWMM reference, once the updated
manual is developed.
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Table 6-2. Recommended City Code and Document Updates (Development-Related)
City document Sections/descriptions Comments
Title 13 Water, Sewer and
Public Utilities
Chapter 13.41 Utility Systems Development
Charge
Chapter 13.48 Storm Drainage Utility
13.41.010: Consider updating definitions and usage of
impervious surfaces and LID.
13.41.050: Consider updating policies regarding and
description of credits available for LID. With LID now generally
required, credits may no longer be appropriate.
Numerous revisions are identified throughout Chapter 13.48.
13.48.010: Permit included updates to definitions of illicit
connection, illicit discharge, hard and impervious surfaces, and
other terms. Consider matching Permit language. Update
SWMM reference.
13.48.100.G: Equivalent service units are currently determined
based on impervious surface area. With the Permit now focused
on “hard surfaces,” consider updating the City’s approach for
consistency. Could impact rate ordinance. Optional and
potentially low priority.
13.48.180.A: Inspection access language appears adequate.
13.48.180.B: Review to confirm that this language is adequate
to enforce O&M of private stormwater facilities.
13.48.180.D: Code identifies 50% buildout; the Permit now
specifies 90%. Update accordingly.
13.48.210.A: Review and consider matching updated language
in Permit related to illicit discharges.
13.48.225: See following:
• MR 2: Add new element “Protect Low Impact
Development BMPs”.
• MR 5: Make significant revisions in accordance with
Permit LID changes.
• MR 6 an 7: Code language is adequate, but changes
in SWMM will be required (e.g., thresholds in terms of
hard surface area, Basic and Enhanced Treatment
requirements).
• MR 8: Wetlands guidance in Ecology Manual changed
significantly (Guide Sheets 1–3, Appendix I-D).
Review further to confirm adequacy of ACC language
13.48.230.B: Update thresholds from impervious to hard
surfaces.
13.48.435: Consider whether modified requirements for single-
family home/small LID facilities are needed.
Title 14 Project Review All
This title was reviewed because of its relationship to the project
review and approval process.
The title generally outlines how projects must be reviewed
consistent with specific requirements found in other sections.
No changes appear necessary.
Title 15 Buildings and
Construction
Chapter 15.07 Construction Administration
Code
Chapter 15.68 Flood Hazard Areas
These sections were reviewed because of their relationship to
development and construction.
15.07.090: No changes appear necessary.
15.68: Permit changes (in particular LID principles) have the
potential to impact or be impacted by flood zone-related code.
The sections appear to be general enough to avoid revision but
their content should be reviewed to ensure that it aligns with the
City’s desired approach to LID.
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Table 6-2. Recommended City Code and Document Updates (Development-Related)
City document Sections/descriptions Comments
Title 16 Environment Chapter 16.10 Critical Areas
These sections were reviewed because the Permit changes (in
particular LID principles) have the potential to impact code
related to critical areas.
As part of the process for determining the City’s approach to LID
implementation, consider how LID policies will relate to critical
areas, critical areas mapping, buffers and setbacks, and other
considerations.
Title 17 Land Adjustments
and Divisions All
This title was reviewed because of its relationship to land use
and development.
The title is not impacted by the technical changes to the Permit,
but may be impacted in various sections by the LID principles
requirement, consistent with the LID approach to be determined
by the City. LID principles-related updates could represent a
major work effort.
Title 18 Zoning All
This title was reviewed because of its relationship to land use
and development.
The title is not impacted by the technical changes to the Permit,
but may be impacted in various sections by the LID principles
requirement, consistent with the LID approach to be determined
by the City. LID principles-related updates could represent a
major work effort.
Potential issues to consider include:
• Landscaping requirements and native vegetation
preservation
• Impervious surface limitations/standards
• Roads and parking standards
• Site plan review criteria
City of Auburn documents
Surface Water Management
Manual (SWMM)
The City developed and uses the SWMM as
its primary mechanism for implementing
state stormwater regulations related to new
development and redevelopment
The SWMM was developed as an equivalent to the Ecology
Manual during the previous Permit cycle. Updates to the Permit
and the Ecology Manual will trigger corresponding updates in
the SWMM in order to maintain equivalency. This includes
changes to the Minimum Requirements, BMPs (for construction,
source control, and facilities), and design guidance and
practices documented in the SWMM. Because the SWMM is
based on the Tacoma Manual, updates to the SWMM may be
able to build on corresponding updates to the Tacoma Manual.
Potential updates to the SWMM represent a major effort for City
staff.
Engineering Design Standards
Chapter 1 General Information
1.02 Engineering Handouts
1.03 Deviations from Standards
1.02.1.2 Update the referenced guidance and permitting
handouts and create new handouts as necessary. Also see
related discussion on Permit Application Checklists below.
1.03 Consider whether updates to the deviation from standards
section are needed based on the City’s implementation
approach for LID and the associated identification of
infeasibility criteria for LID.
Chapter 2 Plan Approval Process
2.02 Review and Approval Process
Depending on the City’s approach to implementing LID,
consider including a submittal requirement related to
infiltration testing. This testing may already be adequately
covered by existing requirements.
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Table 6-2. Recommended City Code and Document Updates (Development-Related)
City document Sections/descriptions Comments
Chapter 4 Report Preparation Requirements
4.02 Report Types
Depending on the City’s approach to implementing LID,
consider expanding on the existing requirement to conduct
infiltration testing and report on the results as part of the
geotechnical report. An alternative approach for smaller
projects needing to implement LID may be desirable (short of a
full geotechnical report, perhaps).
Chapter 5 TESC, Clearing and Grading
5.02 Land Clearing
5.05 Construction Sequence
5.02 Clearing requirements could be affected by City’s
approach to LID and the Permit requirement to minimize native
vegetation loss.
5.05 Consider how LID requirements may affect or need to be
included in construction sequence requirements.
Chapter 6 Storm Drainage This section has been replaced with a reference to the SWMM.
No changes necessary.
Chapter 10 Streets
10.05 Sidewalks
10.06 Bikeways
10.07 Pavement Design
10.08 Landscaping
10.05–10.07 Consider allowing and including specifications
for pervious pavement design if determined to be an acceptable
alternative for sidewalk, bikeway, and/or roadway construction.
10.08 Consider how landscaping elements could be integrated
with or serve a dual purpose for storm drainage.
Updates other than those noted may be needed to align with
potential transportation-related strategies as part of the City’s
broader LID approach.
Chapter 11 Site Design Site design requirements (e.g., zoning, land use) refer to more
specific requirements in the ACC. No updates appear necessary.
Definitions The City may want to consider updating definitions consistent
with relevant Permit definitions.
Engineering Construction
Standards
Special provisions and standard details for
construction.
This document appears unaffected by Permit updates. The City
communicated during workshops the intention to address
stormwater BMPs through the SWMM, and not through standard
specification and details.
Permit Application Checklists and
related guidance documents
Checklists and guidance materials for City
permit applicants: (see City Forms Web site)
These documents were reviewed because of their relationship to
permits and project review.
City forms such as the Residential Permit Submittal Checklist
and Commercial Building Permit Checklist will require update to
align with the new Permit requirements and the City’s approach
to LID.
Section 6 Auburn NPDES Compliance Work Plan
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Table 6-2. Recommended City Code and Document Updates (Development-Related)
City document Sections/descriptions Comments
City Comprehensive Plan
The Plan sets future, long-range goals and
summarizes major City policies and
proposals.
This document was reviewed because of its relationship to
policy determination and implementation. While most of the
plan will be unaffected by Permit changes, updates may be
desirable in the following chapters to better align with the new
Permit language and the City’s determined LID approach (in
particular, potential changes to zoning, land use, or other City
policies that may result from requirements to preserve native
vegetation and trees and to minimize impervious surfaces):
3. Land Use
5. Capital Facilities
7. Transportation (refers out to a separate Transportation
Comprehensive Plan)
9. Environment
Broadly, the Permit requires Permittees to minimize impervious
surfaces and minimize the loss of native vegetation. The City
should consider how those principles can be incorporated into
the goals of the Plan.
More specifically, several items and sections were flagged
during review for additional scrutiny:
• Page 3-28: Note indicating elimination of stormwater
improvements as incentive for redevelopment may
not be consistent with state regulations.
• Page 5-10 (CF-42, 43): Review these two policies
related to stormwater facilities on private property
and regional facilities in light of new focus on LID and
distributed stormwater infrastructure. Other policies
in this section do not appear to require update, but
the City should review to confirm.
• Page 9-2 (EN-2): Check whether this reference to the
Ecology Manual is intentional, or should be replaced
with a reference to the Auburn SWMM.
• Page 9-4 (EN-14): Check whether this reference to
the Ecology Manual is intentional, or should be
replaced with a reference to the Auburn SWMM.
• Page 9-22 (EN-124): Consider updating language in
light of new LID requirements (no longer only
“encouraged”).
• Page 15-4: Update the description of the
Comprehensive Drainage Plan consistent with the
current update in progress.
Coordination with the Comprehensive Storm Drainage Plan
update is recommended.
Auburn NPDES Compliance Work Plan Section 6
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Table 6-2. Recommended City Code and Document Updates (Development-Related)
City document Sections/descriptions Comments
Comprehensive Storm Drainage
Plan
The Plan guides the City’s Stormwater
Drainage utility with respect to future
activities and improvements for the
stormwater drainage system.
This document was reviewed because of its relationship to
policy determination and implementation.
While most of the plan will be unaffected by Permit changes,
updates may be desirable throughout the Plan to better align
with the new Permit language and the City’s determined LID
approach.
The following specific areas were flagged for update:
• Figure ES-2: Update timeline for Permit compliance
• Section 2.2: Describe future updates to City codes
and standards
• Section 2.3.2: Review and revise NPDES Permit
description
• Section 3.2: Review how levels of service will be
affected by new LID focus and implementation
• Sections 4.1.6/4.1.7: Review how these sections
related to geology, soils, and groundwater affect or
are affected by LID requirements and feasibility
criteria
• Section 4.1.8.3: Update section on development
regulations and drainage design standards
• Section 7.3: Update section on NPDES compliance
programs, including Figure 7-2 (matches Figure ES-2)
Coordination with the City Comprehensive Plan update is
recommended (e.g., policies CF-40, EN-12, and EN-17).
The Comprehensive Storm Drainage Plan should indicate
coordination of maintenance activities with a schedule
developed to comply with Ecology requirements and asset
criticality.
Shoreline Master Program
The Program provides policies and
regulations to govern development and other
activities along the City’s shorelines. It
includes guidance related to critical areas,
buffers, and general stormwater/LID
management and goals.
Discussion related to stormwater appears to be general and
unaffected by the detailed changes to the Permit.
To the extent that the City’s LID implementation process
(including policies to preserve native vegetation and minimize
impervious surfaces) affects critical areas and buffer
requirements, updates to those elements could be needed. No
immediate changes were identified.
Downtown Urban Center Design
Standards
The Design Standards outline architectural
guidelines for downtown development. This
includes guidelines for elements like parking
spaces and lots, driveways, and pedestrian
sidewalks.
To the extent that these parking and access elements are
affected by potential land use, zoning, and transportation
changes made during the City’s LID implementation process,
the Design Standards may need to be updated.
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Section 7
Municipal Operations and
Maintenance
This section summarizes new Permit requirements for Municipal Operations and Maintenance, current
compliance activities that are applicable to the new requirements, and recommended actions to
maintain future compliance.
7.1 New Permit Requirements
Section S5.C.5 of the Permit requires the City to:
Update maintenance standards as necessary to meet updated Permit requirements
Inspect all catch basins and inlets owned or operated by the City at least once no later than August
1, 2017, and every 2 years thereafter
Implement practices, policies, and procedures to reduce stormwater impacts associated with runoff
from all lands owned or maintained by the Permittee, and road maintenance activities under the
functional control of the Permittee (added buildings, parks, open spaces, road rights-of-way,
maintenance yards, and stormwater facilities to Permit list of Permittee lands)
7.2 Current Compliance Activities Applicable to New Requirements
The City currently has activities and programs that meet many of the requirements of Section S5.C.5 of
the Permit. Current activities and programs include the following:
The City operates an O&M program intended to minimize pollutant runoff from municipal operations.
The City conducts and records the inspections and cleaning of City-owned and -permitted
stormwater facilities and elements of the collection system (e.g., catch basins, outfalls).
7.3 Recommended Actions to Maintain Future Compliance
Auburn has a well-developed municipal stormwater system O&M program to minimize water quality
impacts from municipal operations. Some updates to programs and activities will be necessary to
maintain compliance with the new Permit requirements. Table 7-1 lists activities and time frames for the
City to comply with new Permit conditions related to municipal operations and maintenance.
Section 7 Auburn NPDES Compliance Work Plan
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Table 7-1. Municipal Operations and Maintenance
Task ID Task description Lead Support Compliance time
frame
MOM-4
Review City maintenance standards (SWPPPs, SOPs, SWMM
BMPs, City inspection schedules/Cartegraph tracking, other)
relative to new requirements in S5.C.5, including new inspection
and cleaning requirements and additional City lands identified.
Update if needed.
SWPPPs appear unlikely to require update.
Utilities Engineering
M&O, Parks,
Building
Maintenance,
IT
December 31, 2016
MOM-5
Continue inspection and cleaning of catch basins currently
conducted. Meet at a minimum one inspection of each catch
basin by August 1, 2017, and at least once every 2 years
thereafter, or justify a longer cycle (see below).
The City is currently inspecting on a 3-year rotating basis.
M&O Utilities
Engineering
August 1, 2017
Every 2 years thereafter
MOM-6
If desired, use maintenance records to justify an alternative catch
basin inspection frequency (e.g., every 3 years). If this approach is
selected, compile and submit maintenance records to Ecology.
Utilities Engineering M&O Optional
Note: Task ID numbering and work items build on tasks currently included in the 2014 SWMP.
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Section 8
TMDL Compliance
This section summarizes new Permit requirements for total maximum daily load (TMDL) compliance,
current compliance activities that are applicable to the new requirements, and recommended actions to
maintain future compliance.
8.1 New Permit Requirements
The Permit contains two sections that address TMDL requirements: Section S7 and Appendix 2. Section
S7 received minor updates, while Appendix 2 was entirely revised from the prior version.
Appendix 2 contains TMDL requirements for specific water bodies and Permittees, including the City of
Auburn. The City has required actions identified for the Puyallup Watershed Water Quality Improvement
Project, which is a fecal coliform TMDL for portions of the Puyallup River Watershed. The City is
specifically required to:
Beginning no later than October 1, 2013, conduct twice monthly wet weather sampling of
stormwater discharges to the White River at Auburn Riverside High School to determine if specific
discharges from Auburn’s MS4 exceed the water quality criteria for fecal coliform bacteria.
o Data shall be collected for one wet season.
o Data shall be collected in accordance with an Ecology-approved QAPP.
o Data collected since EPA TMDL approval can be used to meet this requirement.
For any of the outfalls monitored above showing discharges that exceed water quality criteria for
primary contact recreation: designate those areas discharging via the MS4 of concern as high
priority areas for illicit discharge detection and elimination efforts and implement the schedules and
activities identified in S5.C.3 of the Western Washington Phase II permit for response to any illicit
discharges found beginning no later than August 1, 2014.
Install and maintain pet waste education and collection stations at municipal parks and other
Permittee owned and operated lands adjacent to streams. Focus on locations where people
commonly walk their dogs.
8.2 Current Compliance Activities Applicable to New Requirements
The City has completed required wet weather monitoring of discharges to the White River.
The City maintains pet waste education and collection stations at municipal parks and other public lands
adjacent to the White River and its tributaries.
8.3 Recommended Actions to Maintain Future Compliance
Table 8-1 lists activities and time frames for the City to comply with new Permit conditions related to
TMDL compliance. The City’s 2014 SWMP contains current tasks related to TMDL compliance. The
tasks shown in Table 8-1 build on those current tasks identified in the SWMP.
Section 8 Auburn Phase II Compliance Work Plan
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Table 8-1. TMDL Compliance
Task ID Task description Lead Compliance time frame
TMDL-2
Maintain pet waste education and collection
stations at municipal parks and other public lands
adjacent to the White River and its tributaries.
Parks
Department Ongoing
TMDL-3
If triggered by wet weather monitoring results,
designate areas contributing to water quality
exceedances as high priority areas for illicit
discharge detection and elimination efforts;
implement permit-required responses for any
illicit discharges found.
Utilities
Engineering August 1, 2014
Note: Task ID numbering and work items build on tasks currently included in the 2014 SWMP.
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Section 9
Monitoring and Assessment
This section summarizes new Permit requirements for Monitoring and Assessment, current compliance
activities that are applicable to the new requirements, and recommended actions to maintain future
compliance.
9.1 New Permit Requirements
The Permit (Section S8) was substantially revised from the prior version. Permittees are required to:
Conduct Status and Trends Monitoring and Effectiveness Studies, or pay annually into a collective
fund to implement monitoring through the Regional Stormwater Monitoring Program (RSMP).
Auburn’s annual payment will be $45,096.
Pay into the RSMP to implement the RSMP Source Identification Information Repository (SIDIR).
Auburn’s annual payment will be $2,614.
Provide the following monitoring and/or assessment data in each Annual Compliance Report:
A description of any stormwater monitoring or studies conducted by the City during the reporting
period. If stormwater monitoring was conducted on behalf of the City, or if studies or
investigations conducted by other entities were reported to the City, a brief description of the
type of information gathered or received shall be included in the Annual Compliance Report.
9.2 Current Compliance Activities Applicable to New Requirements
The City committed in 2013 to make annual payments into the Ecology monitoring programs, in lieu of
running an independent monitoring program. Program payments are planned by the City in compliance
with annual due dates.
9.3 Recommended Actions to Maintain Future Compliance
Table 9-1 lists activities and time frames for the City to comply with new Permit conditions related to
monitoring and assessment. The City’s 2014 SWMP contains task MNTR-1, which identifies annual
payments into the Ecology monitoring programs. Because the SWMP already captures relevant new
activities for monitoring, the work plan mirrors the SWMP.
Table 9-1. Monitoring and Assessment
Task ID Task description Lead Compliance time frame
MNTR-1
Pay $47,710 annually into the RSMP collective
fund for implementation of Status and Trends
Monitoring, Effectiveness Studies, and the Source
Identification Information Repository.
Utilities
Engineering
Annual payment due by
August 15, starting in 2014
Note: Task ID numbering and work items build on tasks currently included in the 2014 SWMP.
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Section 10
Limitations
This document was prepared solely for the City of Auburn in accordance with professional standards at
the time the services were performed and in accordance with the contract between the City of Auburn
and Brown and Caldwell dated October 17, 2013. This document is governed by the specific scope of
work authorized by the City of Auburn; it is not intended to be relied upon by any other party except for
regulatory authorities contemplated by the scope of work. We have relied on information or instructions
provided by the City of Auburn and other parties and, unless otherwise expressly indicated, have made
no independent investigation as to the validity, completeness, or accuracy of such information.
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Section 11
References
Western Washington Phase II Municipal Stormwater Permit, Washington State Department of Ecology, effective date
August 1, 2013.
Stormwater Management Manual for Western Washington, Washington State Department of Ecology, August 2012.
Integrating LID Into Local Codes: A Guidebook for Local Governments, AHBL for the Puget Sound Partnership, July
2012.
Illicit Discharge Detection and Elimination: A Guidance Manual for Program Development and Technical
Assessments, Center for Watershed Protection and Robert Pitt (University of Alabama), October 2004.
Auburn NPDES Compliance Work Plan
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$WWDFKPHQW A: Permit Compliance Schedule (Draft)
(Courtesy Cities of Covington and SeaTac)
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A1 SWMP Develop & Implement
A2 SWMP Plan Annually Updated
A3 a.Track Costs or Estimated Costs
b.Track Inspections, Enforcements & Public Educ. Activities
A4 Continue Implementation of Exising Programs
A5 a.Include Coord. Mech. wi Other Entities (If Applicable)
b.SWMP Includes Internal Coordination Mechanisms
C1 a.Public Education & Outreach (Local or Regional)
b Create Stewardshp Opportunities
c Measure Understanding & Adoption of Behaviors
C2 a.Public Involvement & Participation (Create opport.)
b.SWMP & Annual Report Website Posting
C3 Illicit Discharge Detection and Elimination
a.Ongoing Stormwater Mapping - periodically update
a.v Map All New Connections Since February 16, 2007
b.IDDE Ordinance Update
c.Illicit Discharge Detection & Elimination Program
c.i Field Screen 40% of MS4 12/31/17- 12% yrs thereafter
c.i Document Field Screen Methodology in Annual Report
c.ii Publically List Phone #'s for Reporting Spills
c.iii Ongoing Training all Muni. Field Staff - Lvl B (Tracked)
c.iv IDDE Education
d
e.Ongoing Training IDDE Staff - Lvl A (Tracked)
C4 Construction Site Runoff Program
a.Update Construction Site Runoff Ordinance
a.i Adopt Appendix 1 or Approved Phase I Program
a.i Adopt Variance Criteria Equiv. to Appendix 1
a.ii Site Plan & BMP Select per Append 1 or Approved Ph I
a.iii Ord./ Reg. Mech. Giving Legal Authority to Inspect
b.Implement Permit Process / Plan Review & Inspect. wi
new thresholds
b.i Review All Stormwater Site Plans
b.ii Pre-Con Site Inspection
b.iii Inspect All Sites for Erosion and Sediment Controls
b.iii Enforce ESC as Necessary
b.iv Final ESC Inspection
b.iv Maintenance Plan for New Facilities (Bond Program)
b.iv Enforce Maintenance Plan (Bond Program)
b.v Minimum 80% Compliance wi Inspect. Requirements
b.vi Enforcement Strategy
c.O&M for Private Stormwater Facilities & BMPs
- Long Term Mnt - Treatment & Flow Control BMPS
c.i Enforce. Mech. Identifying Responsibilities for O&M
c.ii Est. Maint. Standard = to Ch.4 Vol.V of 12' SMMWW
c.iii Annual Inspection of Private Facilities Aprvd after 2/15/10
c.iv
Inspect Bonded Resid. Facilities Every 6 Months until
90% of lots constructed (or when construction stops and
sites are fully stabilized)
c.vi Compliance = records + 80% scheduled inspections Reduced standard frm 95%
c.vi Perform Timely Maintenance
c.vii Track Inspections, Enforcements etc. (All Notices)
d.Make NOI for Const. & Industrial Site Avail. & Enforce
Local Regs on NPDES Const. Sites
e.Train All Applicable Staff on Above Activities (Track)
f.Low Impact Development
f.i.Incorporate LID into Codes, Rules Stnds & Enf. Docs
Making LID Prefered/Commonly Used Approach
f.ii Submit Summary of Results of LID Update Process
g.Watershed Scale Stormwater Planning wi Phase Is Not Applicable - SeaTac Watersheds not selected
C5 O&M Program (for Municipally Owned or Operated)
a.Update Maint. Stnds = to Ch.4 Vol.V of 12' SMMWW
a.ii Perform Timely Maintenance
b.Annually Inspect All Treatment & Flow Cntrl. Facilities
c Spot Check Inspections After Major Storms (10 yr 24 Hour)
d.Catch Basin Insp. & Mnt. - All by 8/17 - then every 2 yrs 2 year schedule
e.Ensure 95% compliance for O&M inspections
f.Establish & Implem. Practices to Reduce Impacts
g.O&M Training Program (Train to Standards)
i SWPPPs for All Heavy Equip. Mnt. & Storage Yards
j Track Maint. & Repair Activities Identified Above
A Monitoring & Assessment - Submit Stormwatwer Studies
B1 Status & Trends Monitoring Notification & Contribution Notification to DOEAnnual Payments Start
C1 Effectiveness Monitoring Notification & Contribution Notification to DOEAnnual Payments Start
D Source Ident. & Diagnostic Monitoring (Info. Repository)Annual Payments Start
A1 Annual Compliance Report
G1
8
CH
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S9
WWESTERN WASHINGTON PHASE II MUNICIPAL STORMWATER PERMIT IMPLEMENTATION SCHEDULE
2013 2014 2015 2016 2017 2018
S5
S8
Apply for permit renewal
LEGEND: Effective & Expiration Dates of Permit Ongoing Requirement Permit Deadline
G1
8
Auburn NPDES Compliance Work Plan
B-1
Use of contents on this sheet is subject to the limitations specified at the end of this document.
2014 Auburn NPDES Compliance Work Plan.docx
$WWDFKPHQW B: Compliance Effort Estimate
Memorandum
Limitations:
This document was prepared solely for the City of Auburn in accordance with professional standards at the time the services were performed and in
accordance with the associated contract between the City of Auburn and Brown and Caldwell. This document is governed by the specific scope of
work authorized by the City of Auburn; it is not intended to be relied upon by any other party except for regulatory authorities contemplated by the
scope of work. We have relied on information or instructions provided by the City of Auburn and other parties and, unless otherwise expressly
indicated, have made no independent investigation as to the validity, completeness, or accuracy of such information.
701 Pike Street, Suite 1200
Seattle, Washington 98101
T: 206.624.0100
F: 206.749.2200
Prepared for: City of Auburn
Project Title: NPDES Compliance Assistance
Project No.: 145125
Memorandum
Subject: Effort Estimate
Date: July 2, 2014
To: Chris Thorn, Water Quality Program Coordinator
From: Patrick Weber, Project Manager
Copy to: Tim Carlaw, Storm Drainage Engineer
Prepared by: Patrick Weber, P.E.
Kirsten Wood, EIT
Reviewed by: Damon Diessner
Memorandum
1
Effort Estimate Memo FINAL.docx
The Department of Ecology issued an updated National Pollutant Discharge Elimination System (NPDES)
Phase II Municipal Stormwater Permit (Permit) on August 1, 2013. As a Phase II Permittee, the City of
Auburn (City) must update its codes and policies to comply with the new Permit requirements. The City began
this process by completing a gap analysis to identify existing City codes and policies that may be affected by
the Permit.
Based on discussions with City staff, Brown and Caldwell (BC) estimated the additional efforts required by
the City to address potential gaps identified in the gap analysis.
Estimated resources are listed in terms of full-time employees (FTE), limited-term employees (LTE), materials
and equipment, and fees (all changes relative to the 2013 baseline year).
The following additional resource needs have been identified, relative to a 2013 baseline:
• Annual fee to participate in Ecology’s monitoring programs is $47,710 USD
• In 2014, 1.05 FTEs, 0.7 LTE, and equipment, including 1 stormwater inspector
• In 2015, 3.05 FTEs, 1.7 LTEs, and equipment, including 1 stormwater inspector and 2 M&O field staff
• In 2016, 3.3 FTEs, 2.55 LTEs, and equipment, including 1 stormwater inspector and 2 M&O field staff
• In 2017, 5.65 FTEs, 0 LTEs, and equipment, including 2 stormwater inspectors, 2 M&O field staff, and 1
LID facility inspector
• In 2018, 5.9 FTEs, 0 LTEs, and equipment, including 2 stormwater inspectors, 2 M&O field staff, and 1
LID facility inspector
Table 1 includes the estimated additional effort, costs, materials and timing for each Permit compliance
activity. The numbering in the first column corresponds to the attached schedule table, which includes the
estimated additional effort required each year from 2014 to 2018.
Table 1. Estimated Resources Required for Compliance
Schedule table
reference number
Description Duration
1.A City permit review staff to update public guidance materials
and checklists to align with the new City/NPDES Permit
requirements.
One-time effort in 2016 once updates to City requirements are
clarified, early enough to be able to inform the public in advance
of upcoming/new requirements.
[0.1 LTE one-time in 2016]
1.B Additional staff effort to conduct permit application reviews.
Additional staff effort will be driven by more complex,
iterative permitting processes for LID, including site-specific
LID feasibility review and determinations.
Ongoing effort starting in 2017, potentially ramping up with long
term growth and an increase in permit applications.
[0.25 FTE ongoing starting in 2017]
2.A Additional staff inspector(s) focused on stormwater
elements. The position could require additional and
specialized training in stormwater management, water
quality, erosion control and LID installation requirements.
Ongoing effort starting in 2014. Includes training and
coordinating responsibilities among inspector groups for
different project types. Additional inspector added in 2017 as
new LID requirements become active, potentially continuing to
ramp up over time.
[1.0 FTE from 2014 to 2016, increasing to 2.0 FTEs ongoing
starting in 2017]
Effort Estimate Memorandum
2
Use of contents on this sheet is subject to the limitations specified at the beginning of this document.
Effort Estimate Memo FINAL.docx
Table 1. Estimated Resources Required for Compliance
Schedule table
reference number
Description Duration
2.B Define, coordinate and update procedures and
responsibilities among inspector groups.
One-time effort should occur in 2014 before or coinciding with
filling additional inspector position to ensure that all required
tasks are covered among the roles.
[0.1 LTE one-time in 2014]
3.A Define and organize LID asset classification, and
coordinate/update maintenance tracking methods.
Additional efforts to track and record maintenance of
stormwater assets.
One-time setup of asset management systems and protocols
should occur in 2016. Ongoing tracking will continue and
potentially ramp up with increase in development with tracked
assets.
[0.25 FTE in 2016 decreasing to 0.1 FTE ongoing starting in
2017]
3.B Develop procedures for public LID facility maintenance and
oversight of private facilities.
One-time effort should occur in 2016 so procedure is defined
before 12/31/2016 deadline.
[0.25 LTE one-time in 2016]
3.C Inspect, clean and maintain catch basins at frequencies as
required by the Permit. New hire(s) will require a vehicle and
field equipment.
Ongoing effort starting in 2015.
[2 FTE ongoing starting in 2015]
3.D Maintain publicly owned LID facilities and other stormwater
assets. Obtain required equipment for facility maintenance.
Ongoing effort starting in 2017, with potential increases over
time due to future growth.
[0.25 FTE in 2017 increasing to 0.5 FTE ongoing starting in
2018]
4.A Update public education and outreach materials to include
additional target audiences, evaluate program effectiveness,
and conduct regional coordination.
Ongoing effort starting in 2014.
[0.05 FTE ongoing starting in 2014]
5.A Update or adopt Stormwater Manual to meet requirements. One-time effort ramping up in 2015 and completed in 2016.
[0.5 LTE in 2015 increasing to 1.0 LTE in 2016]
5.B Develop City planning methods and update Code to meet
new Permit requirements for stormwater, including new
runoff control requirement thresholds, BMP performance
standards and LID requirements.
One-time effort ramping up in 2014 and completed in 2016.
[0.5 LTE in 2014 increasing to 1.0 LTE in 2015 and 2016]
5.C Inspect new LID facilities regularly and purchase and
maintain any associated field instruments required to
perform inspections.
Ongoing effort starting in 2017 and potentially increasing with
future development.
[1.0 FTE ongoing starting in 2017]
6.A Update City Comprehensive Plan related to implementation
of LID principles that could affect elements beyond
stormwater management implementation such as levels of
service, setbacks, zoning densities, etc.
One-time effort ramping up in 2014 and completed in 2016.
[0.1 LTE in 2014 increasing to 0.2 FTE in 2015 and 2016]
7.A Annual fees to participate in Ecology-run statewide
monitoring programs.
Annual fee starting in 2014.
[$47,710 annually starting in 2014]
For more details on each item, see attached spreadsheet
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C-1
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.
Auburn Drainage Plan Draft - Appendices.docx
Appendix C: Hydrologic and Hydraulic Modeling and
Evaluation
Draft Technical Memorandum
Limitations:
This is a draft memorandum and is not intended to be a final representation of the work done or recommendations made by Brown and Caldwell. It
should not be relied upon; consult the final report.
This document was prepared solely for City of Auburn in accordance with professional standards at the time the services were performed and in
accordance with the contract between City of Auburn and Brown and Caldwell dated December 6, 2013. This document is governed by the specific
scope of work authorized by City of Auburn; it is not intended to be relied upon by any other party except for regulatory authorities contemplated by
the scope of work. We have relied on information or instructions provided by City of Auburn and other parties and, unless otherwise expressly
indicated, have made no independent investigation as to the validity, completeness, or accuracy of such information.
701 Pike Street, Suite 1200
Seattle, WA 98101
Phone: 206-624-0100
Fax: 206-749-2200
Prepared for: City of Auburn
Project Title: Comprehensive Storm Drainage Plan
Project No.: 145295
Draft Technical Memorandum
Subject: Auburn Storm Drainage Hydrologic and Hydraulic Modeling and Evaluation
Date: April 17, 2015
To: Tim Carlaw, Storm Drainage Engineer
From: Colleen O. Doten
Copy to: Lisa D. Tobin, Utilities Engineering Manager
Prepared by: Margaret Ales
Colleen O. Doten
Reviewed by: Nathan Foged
Auburn Storm Drainage Hydrologic and Hydraulic Modeling and Evaluation
ii
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the beginning of this document.
Appendix C - H&H Modeling and Evaluation.docx
Table of Contents
List of Figures ........................................................................................................................................................... iii
List of Tables ............................................................................................................................................................. iii
List of Abbreviations ................................................................................................................................................. iv
Section 1: Introduction ............................................................................................................................................. 1
1.1 Background ........................................................................................................................................................ 1
1.2 Purpose and Objectives ..................................................................................................................................... 1
Section 2: Model Development and Refinement ................................................................................................... 3
2.1 Model Development ........................................................................................................................................... 5
2.1.1 Updating Existing PCSWMM Models ................................................................................................ 5
2.1.2 Creating New Models ........................................................................................................................ 9
2.2 Hydraulic Parameters ........................................................................................................................................ 9
2.3 Monitoring Data ............................................................................................................................................... 10
2.4 Climatic Data .................................................................................................................................................... 10
2.4.1 Precipitation ..................................................................................................................................... 11
2.4.2 Evaporation ...................................................................................................................................... 11
2.5 Horizontal and Vertical Datum ........................................................................................................................ 11
Section 3: Model Calibration and Evaluation ....................................................................................................... 12
3.1 BCDF Model Calibration................................................................................................................................... 12
3.1.1 Methodology ..................................................................................................................................... 12
3.1.2 Calibration Results .......................................................................................................................... 14
3.2 P Subbasin Model Calibration ......................................................................................................................... 17
3.2.1 Calibration Results .......................................................................................................................... 17
3.3 Estimating Flows for Project Development..................................................................................................... 18
3.3.1 Level of Service ................................................................................................................................ 18
3.3.2 Flow Frequency Determination ....................................................................................................... 19
Section 4: Annexation Area Desktop Evaluation .................................................................................................. 21
4.1 Methodology ..................................................................................................................................................... 21
4.1.1 Assessment Guidelines ................................................................................................................... 21
4.1.2 GIS-Based Methodologies ............................................................................................................... 21
4.2 Results .............................................................................................................................................................. 21
4.3 Summary and Recommendations .................................................................................................................. 25
Section 5: Summary ............................................................................................................................................... 26
References .............................................................................................................................................................. 27
Auburn Storm Drainage Hydrologic and Hydraulic Modeling and Evaluation
iii
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the beginning of this document.
Appendix C - H&H Modeling and Evaluation.docx
List of Figures
Figure 2-1. Modeled Subbasins, and Monitoring and Project Locations .............................................................. 4
Figure 3-1. BCDF model meter subbasins ............................................................................................................ 14
Figure 4-1. Subbasin OO Potential Drainage System Gaps Identified during Desktop Evaluation ................... 23
List of Tables
Table 2-1. Subbasin Model Summary ..................................................................................................................... 3
Table 2-2. Model Data Description and Source ..................................................................................................... 5
Table 2-3. PCSWMM Subcatchment Model Attributes .......................................................................................... 6
Table 2-4. Initial Green Ampt Parameters .............................................................................................................. 8
Table 2-5. CN based on Auburn Land Use and Hydrologic Soil Group .................................................................. 8
Table 2-6. SCS Model Parameters .......................................................................................................................... 9
Table 2-7. Manning’s Roughness Coefficients ....................................................................................................... 9
Table 2-8. Flow Monitoring Summary ................................................................................................................... 10
Table 2-9. Auburn Composite Precipitation Record for PCSWMM Models ......................................................... 11
Table 3-1. Final Hydrology Parameters Adjusted during Calibration ................................................................... 13
Table 3-2. BCDF Flow Monitoring Observed Data Model Calibration Summary ................................................. 15
Table 3-3. 17th and 21st Street Pond Level Data Model Calibration Summary ................................................ 16
Table 3-4. W Main Street Pump Station Observed Data Model Calibration Summary ...................................... 18
Table 3-5. Final Hydrology Parameters Adjusted during Calibration ................................................................... 18
Table 3-6. BCDF Model Frequency Analysis Summary ........................................................................................ 19
Table 3-7. P Subbasin Model Frequency Analysis Summary ............................................................................... 20
Table 4-1. Potential Annexation Area Storm Drainage Improvements ............................................................... 25
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List of Abbreviations
2009 Drainage Plan 2009 Comprehensive Stormwater Drainage Plan
BC Brown and Caldwell
BMP best management practice
cfs cubic foot/feet per second
CHI Computational Hydraulics International
CIP Capital Improvement Program
City City of Auburn
CMP corrugated metal pipe
CN Curve Number
CPEP corrugated polyethylene pipe
DEM digital elevation model
DHI Danish Hydraulic Institute
Drainage Plan 2015 Comprehensive Storm Drainage Plan
EPA U.S. Environmental Protection Agency
GIS geographic information system
gpm gallon(s) per minute
HDPE high-density polyethylene
H&H hydrologic and hydraulic
hr hour(s)
ID identifier
in. inch(es)
LiDAR light detection and ranging
LOS Level of Service
n/a not applicable
NAVD88 North American Vertical Datum of 1988
NGVD29 National Geodetic Vertical Datum of 1929
NOAA National Oceanic and Atmospheric Administration
NRCS National Resources Conservation Service
PVC polyvinyl chloride
RCP reinforced concrete pipe
ROW right-of-way
RPVC reinforced polyvinyl chloride
SCADA supervisory control and data acquisition
SCS Soil Conservation Service
SRTC Sensitivity-based Radio Tuning Calibration
USDA U.S. Department of Agriculture
USGS U.S. Geological Survey
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Section 1: Introduction
As part of the 2015 Comprehensive Storm Drainage Plan (Drainage Plan) update, Brown and Caldwell (BC)
performed hydrologic and hydraulic (H&H) analyses for nine problem locations within the City of Auburn’s
(City) storm drainage system. These analyses included model development and refinement, model calibra-
tion (where possible), and desktop evaluations of drainage problems in areas recently annexed from King
County.
1.1 Background
The City initiated an extensive drainage system data inventory and H&H modeling effort to support the
development of capital improvement projects for the 2009 Comprehensive Stormwater Drainage Plan (2009
Drainage Plan). As a result, fifteen storm drainage system models were created for areas throughout the city.
Each model is identified by the lettered subbasin drainage area(s) covered within the model extent. For
example, the “GHI model” covers three subbasins: G, H, and I.
The City’s data inventory effort has continued since 2009, with dedicated field survey staff collecting drain-
age system data across the city on a quarter-section-by-quarter-section basis. The City updates its geograph-
ic information system (GIS) data on an ongoing basis based on the survey data. The City has also continued
to develop and refine models when needed to support the design of capital improvement projects. During
this process, several of the models were converted from MIKE URBAN 1 software to the PCSWMM 2 (version
5.0.022) software to improve modeling efficiency. Additionally, some of the models were refined based on
field survey data, system updates, and monitoring data collected in 2010 and 2011. Leading into the
Drainage Plan update, the City’s models were in varying states of development, depending on the status of
the system inventory and locations of capital improvement projects.
1.2 Purpose and Objectives
Based on the problems identified during the early stages of the Drainage Plan update, existing H&H models
were refined or new models were developed if there was no existing model. After models were developed,
they were calibrated based on available data. The calibrated models were used to perform long term simula-
tions, and perform a flow frequency analysis to identify design storms. The models and the identified design
storms were used to develop capital improvement projects which addressed the identified problem and met
the City’s stormwater Level of Service (LOS) goals. The purpose of this technical memorandum is to docu-
ment the modeling efforts performed in support of the Drainage Plan. The objectives achieved are the
documentation of:
• Model update based on current data sources
• Model development and refinement steps
1 MIKE URBAN is a GIS-integrated, modular software program developed by the Danish Hydraulic Institute (DHI) for modeling water
distribution and collection systems. The stormwater module is internally powered by the SWMM5 engine, which is public domain
software distributed by EPA. Information about MIKE URBAN software can be found at
http://www.mikepoweredbydhi.com/products/mike-urban.
2 PCSWMM is a GIS-based hydraulic and hydrologic modeling platform developed by Computational Hydraulics International (CHI).
The software fully supports the EPA SWMM5 hydrology and hydraulics engine, thus providing comparable computation between
EPA SWMM and PCSWMM models. Information about PCSWMM software can be found at
http://www.chiwater.com/Software/PCSWMM/index.asp.
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• Model calibration steps and calibration results
• Drainage problem evaluation in the annexation areas
The model development and refinement approach and model parameters are described in Section 2.
Calibration efforts, data, and results are discussed in Section 3. A summary of the annexation area desktop
evaluation, which includes modeling and additional evaluations, is provided in Section 4. Section 5 includes
a summary of the H&H modeling and evaluation efforts completed in support of the Drainage Plan.
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Section 2: Model Development and Refinement
The City developed and prioritized a list of nine known drainage problems, along with potential capital
improvement projects to address the known problem, for inclusion in the Drainage Plan. BC performed an
H&H analysis of the storm drainage system at each of the nine problem locations. The following sections
describe the model development procedures and input parameters used to prepare the models for subse-
quent evaluations.
Of the nine prioritized drainage problems, two are located in portions of the city where there is minimal piped
conveyance (i.e. ditch and culverts) or complex natural drainage networks. Since PCSWMM is not the best
tool for analyzing these systems, other modeling tools (WWHM and HEC-RAS) were used to perform H&H
analyses. The seven remaining problems were analyzed using PCSWMM. Table 2-1 lists the storm drainage
subbasins for which models were used to evaluate problems and develop capital improvement projects. The
table also presents unique information for each model including the type of model, infiltration method,
design storms events, calibration status, and associated capital improvement projects.
Table 2-1. Subbasin Model Summary
Modeled
subbasin(s)
Model
Status
Hydrology model
(infiltration method)
Hydraulic
model Design events
Calibration
status Project number and namea
BCDF Updated for
Drainage
Plan
PCSWMM
(Green-Ampt)
PCSWMM 25-year: 11/4/2006
Calibrated for
Drainage Plan
Project 7: D St. SE Storm Improve-
ments
Project 8: 23rd St. SE Drainage
Improvements
GHI Updated for
Drainage
Plan
PCSWMM
(Green-Ampt)
PCSWMM 25-year: 11/4/2006
50-year: 11/5/2006
Calibrated prior
to Drainage Plan
Projects 4A and 4B: 30th Street NE
Area Flooding, Phases 2 and 3
Project 6: North Airport Area Improve-
ments
OO New for
Drainage
Plan
WWHM12
(HSPF)
Manning’s n
equations
Storm ranking in
WWHM12
Calibration data
unavailable
Project 5A: West Hills Drainage
Improvements at S 330th St. and 46th
Pl. S
Project 5B: West Hills Drainage
Improvements near S 31th St. and
54th Ave S
P Updated for
Drainage
Plan
PCSWMM
(Soil Conservation
Service [SCS] Curve
Number [CN])
PCSWMM 25-year: 1/29/1990
50-year: 11/6/2006
Calibrated for
Drainage Plan
Project 1: West Main Street Pump
Station Upgrade
TT Updated for
Drainage
Plan
None, used range of
typical flows
HEC-RAS n/a, used range of
typical flows
Uncalibrated,
due to complexi-
ty of Mill Creek
Project 2: 37th and I Streets NW Storm
Improvements
a. Projects listed correspond to the nine known drainage problems. Projects 4A, 4B, 5A, and 5B each address a separate problem. Project 3 is not
included as it did not require H&H analysis as it is a project to assess pipes that discharge over hillsides.
Figure 2-1 shows the subbasin boundaries highlighting the subbasins modeled for the Drainage Plan, the
location of problem areas for which capital improvement projects have been developed, and monitoring
locations where data were collected to calibrate the models.
!(
!(
!(!(
!(
!(
!(
!(
!(
#*
#*
#*
#*
#
#
#
#
1
7 8
2
6
4B 4A
5A
5B
SR 18
SR 167
A ST SE
C ST SW
B ST NW
I ST NE
AUBURN WAY N
AUBURN WAY S
R ST SE
132ND AVE SE
WEST VALLEY HWY NW
M ST SE
8TH ST E
E MA I N S T
124TH AVE SE
C ST NW
BUTTE AVE
15TH ST SW
SE 288TH ST
2ND ST E
C ST NE
SE 312TH ST
S 277TH ST
JOVITA BLVD
W MAIN ST
15TH ST NW
S 384TH ST
1 9 8 T H A V E E
53RD ST SE
9TH ST E
29TH ST SE
SE 320TH ST
11
4T
H AVE
E
116TH AVE SE
EDWARDS RD E
LA KE TAP PS P KW Y SE
41 S T S T S E S T U C K R I V E R D R
24TH ST E
16TH ST E
K
E
R
S
E
Y
W
A
Y S
E
147TH AVE SE
4TH ST E
18TH ST E
M ST NE
122ND AVE E
12TH ST E
SE 304TH ST
1
9
0
T
H
A
V
E
E
3RD AVE SE
ELLINGSON RD SW
37TH ST SE
PERIMETER RD
SE 272ND ST
4
6
T
H
P
L
S
8TH S T N E
182ND AVE E
110TH AVE E
ACADEMY DR SE
SE LAKE HOLM RD
ORAVETZ RD SE
VALENTINE AVE SE
C
U
T
O
F
F
5
1
S
T
A
V
E
S
SE 282ND ST
144TH AVE SE
17TH ST SE
S 296TH ST
25TH ST SE
12TH ST SE
5
5
T
H
A
V
E
S
D ST SE
1ST AVE SE
TACOMA BLVD
D
S
T
N
W
A ST NE
4TH ST SE
CELERY AVE
30TH ST NE
108TH AVE
EA
ST BLVD
(BOEING)
112TH AVE SE
SE 316TH ST
148TH AVE SE
2
1
0
T
H
A
V
E
E
EA
ST VALLEY
HWY
SE 55TH ST SE
E
V
E
R
G
R
E
E
N
W
A
Y
S
E
D ST NE
M ST NW
O ST NE
SE 368TH PL
W ST NW
S 287TH ST
5TH AVE SW
E ST NE
6 9 T H S T S E
112TH AVE E
S 316TH ST H
A
R
V
EY R
D
S
C
E
NIC D
R S
E
H ST NW
M
A
I
N
S
T
S 292ND ST
W
E
ST
B
LV
D
(
B
OE
I
NG
)
44TH ST NW
3RD AVE SW
1
8
6
T
H
A
V
E
E
10TH ST NE
CLAY ST NW
4TH AVE SW
148TH AVE E
7T H ST S E
137TH AVE E
136TH AVE E
SE 310TH ST
S 3RD AVE
THORTON AVE SW
1
2
7
T
H
PL
S
E
RIV E R D R
BOUNDARY BLVD
L E A H I L L R D S E
118TH AVE SE
58TH AVE S
S 364TH PL
ALGONA BLVD N
104TH AVE SE
S 372ND ST
J ST NE
4T H S T N E 110TH AVE SE
SE 281ST ST
72ND AVE S
56TH PL S
BRIDGET AVE SE
57TH AVE S
DOGWOOD ST SE
2ND AVE SW
8TH ST SE
S 279TH ST
126TH AVE E
T ST SE
F ST SE
FRONTAGE RD
52ND AVE S
SE 274TH ST
1ST ST E
SE 299TH ST
SE 284TH ST
4 9 T H S T N E
H
O
W
A
R
D R
D
SE 296TH WAY
54TH AVE S
A ST SW
U
S
T
N
W
S 331ST ST
7
8
T
H
A
V
E
S
3RD ST E
135TH AVE SE
47TH ST SE
8
6
T
H
A
V
E
S
R ST NW
15TH ST E
MILITARY RD S
13TH ST E
K ST SE
OLIVE AVE SE
10TH ST E
10
8
TH
AV
E
E
SE 323RD PL
5
4
T
H
P
L
S
B ST SE W
Y
M
A
N
D
R
26TH ST SE
S 336TH ST
S 340TH ST
S 3 0 0 T H S T
ELM LN
64 TH ST SE
SE 301ST ST
SE 287TH ST
V ST NW
3RD ST SE
21ST ST NE
HEMLOCK ST SE
56TH AVE S
24TH ST SE
LUND RD SW
PIKE ST NW
2 1 S T S T E
42ND ST NW
17TH ST E
119T
H AVE
E
SE 276TH PL
65TH AVE S
SE 295TH PL
G ST NE
S 297TH PL
O ST SE
27TH ST SE
1
0
2
N
D
A
V
E
S
E
128TH AVE E
S 344TH ST
SE 364TH ST
SE 290TH ST
S 288TH ST
V ST SE
B PL NW
SE 294TH ST
146TH AVE SE
Z ST SE
S 305TH ST
S 370TH ST
19 TH DR NE
SE 307TH PL
SE 314TH ST
140TH AVE SE
28TH ST SE
108TH AVE SE
7 3 R D S T S E
S 319TH ST
S 366TH ST
SE 297TH ST
K ST NE
24TH ST NE
SE 296TH ST
SE 285TH ST
S 368TH ST
117TH AVE SE
S 302ND PL
6TH ST SE
110TH PL SE
55TH AVE
STANLEY AVE
7TH ST
HEATHER AVE SE
11
2
T
H
P
L
S
E
SE 292ND ST
2ND AVE NE
130TH AVE SE
I PL NE
R ST NE
FIR ST SE
CHICAGO AVE
T ST N
E
8TH ST E
SR 18
13TH ST E
SR 167
SR 167
SE 288TH ST
D ST SE
M
S
T
NW
17TH ST SE
SE 304TH ST
M ST NE
SE 272ND ST
SE 282ND ST
16TH ST E
S 277TH ST
108TH AVE SE
51ST AVE S
SE 272ND ST
124TH AVE SE
9TH ST E
S R 1 8
M ST NE
SE 284TH ST
SR 167
8 T H S T N E
S
R
1
6
7
SR 167
SR 167
144TH AVE SE
S R 1 8
SR 167
51ST AVE S SR 167
S R 18
R
S
T
NW
2ND ST E
LEGEND
#Mill Creek Gauge
#*Flow Monitor
!(Project Location
Roadway
Watercourse
Water Body
Wetland
Auburn City Boundary
¯0 5,000 10,0002,500
Feet
COMPREHENSIVE STORM DR AINAGE PLANApril 2015 Figure 2-1Modeled Su bbasins, and Monitoringand Project Location s
P:\Auburn\145295 Auburn Stormwater Comp Plan\GIS\MXD\HHModelTechMemo\AuburnStorm_Fig2-1(projects).mxd
1 inch = 5,000 feet
ID Project Name 1 West Main Street Pump Station Upgrade 2 37th and I Streets NW Storm Improvements 3 Hillside Drainage Assessment* 4A 30th Street NE Are Flooding, Phase 2 4B 30th Street NE Are Flooding, Phase 3 5A West Hills Drainage Improvements near S 330th St. and 46th Pl. S 5B West Hills Drainage Improvements at S 314th St. and 54th Ave. S 6 North Airport Area Improvements 7 D St. SE Storm Improvements 8 23rd St. SE Drainage Improvements 9 Comprehensive Storm Drainage Plan update* 10 Composting Facility (location to be determined)* 11 Storm Drainage Infrastructure Repair & Replacement* 12 Street Utility Improvements* *Project not mapped; multiple locations or location to be determined
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2.1 Model Development
Existing PCSWMM models were updated with recent data. If there was not an existing model in a problem
area, a new model was developed. The steps taken to update models or create new models are described
below.
2.1.1 Updating Existing PCSWMM Models
GIS data from December 2013 and June 2014 were used to update the PCSWMM files for the BCDF, GHI,
and P models. Survey data for quarter-sections 1009 and 1109 collected in November 2014, after the initial
data were provided to BC, are included in the BCDF model. The following infrastructure data attributes were
checked against the GIS data:
• pipe size
• pipe invert elevations
• pipe material (for estimating pipe roughness)
• node (i.e. catch basin or manhole) rim elevation
• system connectivity
Where the GIS data did not include recent survey information and did not accurately describe the existing
system (based on the City’s knowledge of the system), technical reports, record drawings, or construction
drawings were used to update the model. Detailed pipe information from a stormwater infrastructure survey
performed by Reid Middleton in 2011 were used to update the GHI model.
For model hydrology, subcatchment delineations within problem areas were reviewed and revised based on
recent GIS data, topographic data (2-foot contour data), and 2012 aerial photography. Total impervious area
was estimated with the City’s impervious area coverage included in the December 2013 GIS data. Sub-
catchment slope was estimated as the average slope based on a digital elevation model (DEM) or 2-foot
contour data. Table 2-2 summarizes the model data sources.
Table 2-2. Model Data Description and Source
Data type Description and source
Hydrologic model input
Subbasin and subcatch-
ment boundaries
Existing model subbasin boundaries refined based on City GIS topography (2-foot contour data), roads, stormwater
infrastructure data, record drawings, and aerial photography.
Land use City land use GIS data.
Impervious area City GIS impervious area coverage from December 2013 and Sutherland equationsa used to estimate effective
impervious area (P subbasin).
Hydrologic soil group Hydrologic soil group available from National Resources Conservation Service (NRCS) soil data.
Slope Weighted average slope from U.S. Geological Survey (USGS) DEM data sets (PCSWMM models).
City 2-foot contour data (all other models).
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Table 2-2. Model Data Description and Source
Data type Description and source
Hydraulic model input
Conduits (stream, creek,
and ditch, pipe and culvert)
Primary sources of data were City GIS data, record drawings, construction drawings, or modeling reports. If these
sources were not available, conveyance extent was estimated with City 2-foot contour data and aerial photography,
and Google aerial and street view photographs.
Nodes (manhole, catch
basin, and infall)
Primary sources of data were City GIS data, record drawings, construction drawings, or modeling reports. If these
sources were not available, rim elevations were estimated from City 2-foot contour data and invert elevations were
estimated based on connected pipe and node data, as noted in the model.
Outfall Primary sources of data were City GIS data. If these sources were not available, rim elevations were estimated from
City 2-foot contour data.
Storage facility
(wetland, detention ponds)
City GIS data and 2012 aerial photography, Google street view.
Boundary conditions at
outfalls
Modeled as fixed level based on monitoring data (Mill Creek gauge) or modeled water surface elevations (Green
River Hydraulic Modeling and Mapping, BCDF model).
b. Sutherland equations are empirically based formulas to estimate effective impervious area from a mapped impervious area value based
on observed or assumed surface water connections.
2.1.1.1 Hydrologic Parameters
Subcatchment parameters define the hydrologic component of the PCSWMM model. Table 2-3 lists the
subcatchment attributes and the values for each PCSWMM model. Where flow monitoring data were availa-
ble, calibration was completed by adjusting hydrologic parameters: estimating effective impervious area,
reducing subcatchment width, and adjusting soil conductivity parameters (see Section 3 for additional
information on calibration procedures).
Table 2-3. PCSWMM Subcatchment Model Attributes
Model
attribute Description Value
Name Subcatchment name assigned to correlate with the name of the subcatchment
outlet node based on City ID (i.e. 909-B1) Process same for all models
Rain gauge Composite precipitation time series Same for all models (see Table 2-9)
Area Area of the subcatchment in acres. Varies, based on subbasin dimensions
Length Maximum length of overland sheet flow in feet. Estimated in GIS based on the
manually drawn longest flow path.
Varies, based on subcatch-
ment and calibration P
Varies, based on subcatch-
ment BCDF, GHI
Width
Width of the overland flow path for sheet flow in feet. Calculated within
PCSWMM as area/length. For P subbasin, used as a calibration parameter, by
adjusting the length.
Varies, based on subcatch-
ment dimensions and
calibration
P
Varies, based on subcatch-
ment dimensions BCDF, GHI
Slope Average percent slope of the subcatchment. Varies, based on DEM or GIS 2-foot contour data
Imperv Percent of land area that is directly connected impervious area.
Varies, based on dimensions
and calibration GHI, P
Varies based, dimensions BCDF
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Table 2-3. PCSWMM Subcatchment Model Attributes
Model
attribute Description Value
Nimperv Manning’s n for overland flow over the impervious portion of the subcatch-
ment. 0.012
Nperv Manning’s n for overland flow over the pervious portion of the subcatchment.
Short grass (0.15) Same for all models
Dense grass (0.24) Same for all models
Underdeveloped area (0.40) BCDF
Dstore-
Imperv Depth of depression storage on the impervious portion of the subcatchment. 0.7 inch P
0.75 inch BCDF, GHI
Dstore-Perv Depth of depression storage on the pervious portion of the subcatchment. 0.15 inch BCDF, GHI, P
0.3 inch (underdevelopment area) BCDF
ZeroImperv Percent of the impervious area with no depression storage. 0% GHI
5% BCDF, P
Routing
If assigned outlet, runoff from pervious and impervious areas routes to a node
within the storm drain system. If assigned pervious, a percent of the impervi-
ous area (as specified in PctRouted) is routed to pervious areas and infiltration
computations are performed before flow is routed to the outlet. This is
representative of the not directly connected (versus the effective) impervious
areas.)
Outlet GHI
Pervious BCDF
Varies by subcatchment P
PctRouted Percent of runoff from impervious areas routed to pervious areas before flow is
routed to the outlet. Adjusted during calibration.
100% GHI, P
Varies, based on calibration BCDF
Groundwater Groundwater routing to aquifer. Not modeled because not observed in flow monitoring
data
CurveNo SCS CN calculated as an area-weighted average using land use and
hydrologic soil group within each subcatchment. (see Table 2-6) Relevant to SCS CN model (P subbasin) only
DryTime Time in days for a fully saturated soil to completely dry for SCS CN infiltration
method. (Table 2-6) Relevant to SCS CN model (P subbasin) only
Suction
Head
Soil capillary suction head in inches for Green-Ampt infiltration method. (see
Table 2-4)
Varies by subcatchment BCDF
6.57 GHI
Conductivity Soil saturated hydraulic conductivity in inches/hour for Green-Ampt
infiltration method. Adjusted during calibration (BCDF model). see Table 2-4
Varies by subcatchment and
based on calibration BCDF
0.26 GHI
Initial Deficit Initial soil moisture deficit in fraction of whole for Green-Ampt infiltration
method. Calculated as soil porosity minus field capacity (see Table 2-4)
Varies by subcatchment BCDF
0.3 GHI
2.1.1.2 Infiltration Methods and Parameters
PCSWMM allows for one of three infiltration methodologies, Green-Ampt, Horton, or SCS. Where flow moni-
toring data were available (BCDF and GHI models) infiltration is based on Green-Ampt with infiltration
parameters being adjusted during calibration. The P subbasin model uses the SCS method for infiltration.
Green-Ampt. For the Green-Ampt infiltration method, the suction head, conductivity, and initial deficit
parameters were derived from the NRCS hydrologic soil group (Table 2-4). For the GHI subbasin model, soils
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are predominantly D and the Green-Ampt parameters are consistent for all subcatchments within the model.
For the BCDF subbasin model, soils consist of hydrologic soil groups A, B and D, and the Green-Ampt
parameters are an area-weighted average and vary by subcatchment.
Table 2-4. Initial Green Ampt Parameters
Hydrologic
Soil Group
Average
conductivity
(in/hr)
Suction head
(in./hr)
Initial Deficit
A 2.6 2.89 0.32
B 0.23 5.10 0.22
C 0.10 8.66 0.15
D 0.025 10.47 0.12
Note: Values are based on soil texture class, as related to hydrologic soil group, and
are average (EPA, 2010, Table A.2)
SCS. For the SCS method, CN, saturated hydraulic conductivity, and drying time parameters were assigned
to each subcatchment based on the predominant land use type as shown on soil maps developed by King
County and Pierce County. Where there were multiple soil types or land use within a subcatchment, an area-
weighted average CN was calculated based on the land use assumptions presented in Table 2-5.
Table 2-5. CN based on Auburn Land Use and Hydrologic Soil Group
Auburn land use SCS land use
CN by Hydrologic soil group
A B C D
Open space Open spaces, lawns, parks, golf course, cemeteries, etc.;
Good condition: grass cover on 75% or more of the area
39 61 74 80
Public and quasi-public Open spaces, lawns, parks, golf course, cemeteries, etc.; Fair
condition: grass cover on 50%–75% of the area
49 69 79 84
Heavy commercial, heavy industrial,
downtown
Commercial and business areas (85% impervious) 89 92 94 95
Light commercial, light industrial,
neighborhood commercial
Industrial districts (72% impervious) 81 88 91 93
Office residential Residential 1/8 acre or less lot (65% impervious) 77 85 90 92
High-density residential, moderate-
density residential
Residential 1/4 acre lot (38% impervious) 61 75 83 87
Single-family residential Residential 1/2 acre lot (25% impervious) 54 70 80 86
Rural residential Residential 1 acre lot (20% impervious) 51 68 79 84
Street Streets and roads; paved with curbs and storm sewers 98 98 98 98
Saturated hydraulic conductivity and drying time were assigned based on the NRCS hydrologic soil group
definitions. For the saturated hydraulic conductivity, a value in the middle of the range was used. Values
near the higher end were assigned for the drying time to simulate conditions representative of winter
months, when drainage problems are more likely to occur. Table 2-6 shows the hydraulic conductivity and
drying time by hydrologic soil group.
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Table 2-6. SCS Model Parameters
Hydrologic
Soil Group
Saturated hydraulic
conductivity (in./hr)
Drying
time (days)
A 1 8
B 0.22 10
C 0.1 12
D 0.025 14
2.1.2 Creating New Models
The following is a general description of steps followed to develop new WWHM models for the OO subbasin:
1. Subcatchments within subbasins were delineated with existing GIS data including 2012 aerial photog-
raphy, roadway extents, 2-foot contour data, and drainage network (catch basins, manholes, pipes,
ditches, infalls, and outfalls).
2. Existing GIS data were used to determine hydrologic parameters for WWHM: hydrologic soil group, slope,
land cover (i.e., lawn, impervious area). Subbasin slope was estimated from the 2-foot contour data. To-
tal impervious area was estimated with the City’s impervious area coverage. 2012 aerial photography
was used to estimate vegetation. Table 2-2 summarizes the data types.
3. WWHM uses the HSPF hydrology model. HSPF calculates all individual components of the hydrologic
cycle including surface runoff, interflow, groundwater, soil moisture, and evapotranspiration. HSPF simu-
lates infiltration as a function of soil moisture using a set of regionally calibrated parameters included
within WWHM.
The following is a general description of steps followed to develop the new HEC-RAS model for the TT
subbasin:
1. The extent of existing infrastructure along the flow path affected by, or contributing to, the flooding was
estimated with the use of GIS data and aerial photography. The modeled cross-sections were based on
King County light detection and ranging (LiDAR) data (King County, 2003).
2. The magnitude and range of flow from Mill Creek backwater flows were not available for use in the HEC-
RAS model. Instead, a range of flows typical of the area (1 to 10 cubic feet per second [cfs]) were used
to examine the potential for reducing water surface elevations for ditch and culvert capital improvement
project design (Brown and Caldwell, 2015).
2.2 Hydraulic Parameters
Table 2-7 lists the Manning’s roughness coefficients (n) used for conveyance analysis in the PCSWMM
models, and in the flow calculations for pipe sizing related to the WWHM analysis..
Table 2-7. Manning’s Roughness Coefficients
Conveyance material Model value
Corrugated polyethylene pipe (CPEP) or ADS (manufacturer of CPEP) 0.012
Force main 0.012
Polyvinyl chloride (PVC), reinforced polyvinyl chloride (RPVC), and high-density polyethylene (HDPE) 0.0125
Ductile steel and ductile iron 0.013
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Table 2-7. Manning’s Roughness Coefficients
Conveyance material Model value
Culvert 0.013
Concrete/reinforced concrete pipe (RCP) 0.013
Material unknown 0.013
Corrugated metal pipe (CMP) 0.024
Ditch 0.05
2.3 Monitoring Data
Depth, velocity, and water level monitoring data and pump station supervisory control and data acquisition
(SCADA) data were collected subsequent to the 2009 Plan and used to estimate boundary conditions and
calibrate the BCDF, GHI, and P subbasin models. Table 2-8 lists the monitoring locations, the model and
purpose for which it was used, and the period of record.
Table 2-8. Flow Monitoring Summary
Type Meter ID Location Manhole
ID Modeling purpose Modeled
subbasin Period of record used in model
Depth, velocity AUB_B4 8th St. NE and
Henry Rd. 710-B4 Calibration BCDF 12/17/2010–3/19/2011
Depth, velocity AUB_B86 201 12th St.
SE 909-B86 Calibration BCDF 12/17/2010–3/19/2011
Depth, velocity AUB_B99 16th St. SE
and B St. SE 909-B99 Calibration BCDF 12/17/2010–3/19/2011
Depth, velocity AUB_C18 G St. SE 809-C18 Calibration BCDF 12/17/2010–3/19/2011
Water level n/a 17th St. Pond n/a Calibration BCDF 11/3/2010-12/31/2010
Water level n/a 21st St. Pond n/a Calibration BCDF 11/3/2010-12/31/2010
Water level WL-Mill-01 Mill Creek at
37th St. NW n/a Outfall boundary condition,
average winter month level TT and GHI 8/2/2011–3/14/2014
Water level WL-Mill-04 Mill Creek at W
Main St. n/a Outfall boundary condition,
average winter month level P 8/2/2011–3/14/2014
Flow ST-18 Old West Main
St. & SR 167 807-P156 Calibration City of Auburn
SCADA system 12/28/2012–5/12/2014
2.4 Climatic Data
Precipitation timeseries data are required to simulate the hydrologic modeling processes in PCSWMM and
WWHM. Evaporation data are also required for WWHM and some applications of PCSWMM. The following
sections describe the development of these data for use in the models.
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2.4.1 Precipitation
The PCSWMM models use a volume-based 15-minute time series rainfall record developed by BC for the City
of Auburn with a period of record from October 1, 1948, to November 1, 2014. The data set is a composite
from three rain gauges – City of Auburn, Sea-Tac International Airport, and King County Lakeland Hills
(located in Auburn city limits). The City of Auburn gauge data are used when possible. The City’s gauge has
been collecting rainfall data since 1995. However, based on previous modeling efforts and review of the
City’s gauge data, it was deemed that data from the Sea-Tac International Airport gauge prior to 2010
should be used. The King County Lakeland Hills data are used when it is known the Sea-Tac gauge data do
not reflect the rainfall in Auburn (i.e. during a large event in 2007) and when Auburn gauge data are not
available. Table 2-9 lists the sources of data for the precipitation time series used in PCSWMM modeling
efforts.
The WWHM software contains an embedded precipitation file based on the Sea-Tac gauge from October 1,
1948, to October 1, 2012. This rainfall data was used for the WWHM analysis.
Table 2-9. Auburn Composite Precipitation Record for PCSWMM Models
Rain gauge Period of record Notes
Sea-Tac International Airport 10/1/1948 to 11/30/2007 Data obtained from WWHM
King County Lakeland Hills 12/1/2007 to 12/6/2007 Sea-Tac rainfall not representative at Auburn
Sea-Tac International Airport 12/7/2007 to 12/31/2009 Data obtained from WWHM
City of Auburn 15-min rainfall 1/1/2010 to 12/31/2010 -
City of Auburn aggregated 5-min 1/1/2011 to 11/14/2012 -
King County Lakeland Hills 11/14/2012 to 12/4/2012 Auburn gauge inoperable during this period
City of Auburn aggregated 5-min 12/5/2012 to 11/1/2014 -
2.4.2 Evaporation
Evaporation estimates are used by PCSWMM models that use the SCS CN infiltration method. These models
used monthly evaporation values measured in inches per day, which were provided by the City during
previous planning efforts. WWHM requires potential evapotranspiration estimates. These values are includ-
ed with WWHM.
2.5 Horizontal and Vertical Datum
The horizontal and vertical datums of the models are consistent with the City’s GIS datums as follows:
• horizontal: NAD_1983_StatePlane_Washington_North_FIPS_4601_Feet (GCS_North_American_1983)
• vertical: North American Vertical Datum of 1988 (NAVD88)
Where necessary, elevations from other sources such as as-built drawings and reports that are based on
National Geodetic Vertical Datum of 1929 (NGVD29) were converted to NAVD88. A value of 3.53 feet was
added to the NGVD29 elevation to convert to NAVD88. This conversion value was estimated using the
VERTCON tool provided by the National Oceanic and Atmospheric Administration (NOAA) at the following
website: http://www.ngs.noaa.gov/TOOLS/Vertcon/vertcon.html. The conversion was estimated for latitude
35 degrees, 12 minutes, and 59.69 seconds, and longitude 111 degrees, 40 minutes, and 2.06 seconds.
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Section 3: Model Calibration and Evaluation
BC performed calibration on the BCDF and P subbasin models. The BCDF model was calibrated with flow
monitoring data and pond level data, while the P subbasin was calibrated with pump station SCADA data.
The calibration for these models is described below.
The GHI model was calibrated with flow monitoring data prior to the 2009 Drainage Plan and the Drainage
Plan Update. Therefore, no calibration was conducted for the GHI model as part of the Drainage Plan
Update. There were no observed data for the OO subbasin model. The TT subbasin model was not calibrated
because of the complexity of the natural Mill Creek system that impacts the problem area.
3.1 BCDF Model Calibration
The BCDF model was calibrated based on flow monitoring data (from end of December 2010 through mid-
March 2011) from four locations and pond level data (November and December 2010) from two infiltration
ponds. Peak storm events were identified using data from the four flow meters.
The largest six peak flows at each meter occurred during the same storm events. Five of the peak storm
events were used in model calibration for comparing observed and simulated flows. The sixth event occurred
on January 13, 2011, and the peaks flows for this event did not correspond to the precipitation record.
According to historical weather data, this event included snowmelt, which is not currently simulated with the
model; therefore calibration was completed with the five remaining events. A summary of the storm events is
included in Table 3-2. Model calibration goals were to have modeled peak flows, event volumes and maxi-
mum depths within 15 percent of the observed data.
Peak storm events were also identified for the period when pond level data were available. Seven peak
events were identified, based on the maximum pond level. A summary of the storm events is included in
Table 3-3. Model calibration goals were to have modeled maximum depths within 15 percent of the ob-
served data.
3.1.1 Methodology
The model was calibrated using the PCSWMM Sensitivity-based Radio Tuning Calibration (SRTC) tool to vary
two hydrologic parameters: percent routed and soil hydraulic conductivity. The percent routed parameter is
the percent of impervious area that is not directly connected to the drainage system, but is first routed to the
subcatchment pervious area. The percent routed was varied, from the original GIS-estimated impervious
area, by a fixed amount for all subcatchments upstream of a meter. Subcatchments upstream of meter (or
calibration subbasins) are shown on Figure 3-1. The percent routed was adjusted so the simulated peak
flow matched the flow monitoring data.
Hydraulic conductivity was adjusted (increased from the soil-based values) to match the recession (i.e. tail
end) of the storm hydrograph, which affected the simulated storm event volumes. For some calibration
subbasins, the values were increased by a fixed percentage. In other calibration subbasins, the percent
change was varied by soil type, based on a visual comparison of the simulated and observed event hydro-
graphs.
If simulated and observed values were within 15 percent, then the calibration was considered reasonable.
Furthermore, visual assessment of the event peak flow, volume and depth was made to qualify the calibra-
tion results.
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For unmonitored areas, the lowest percent routed from the calibrated subbasins was applied to all sub-
catchments. Applying the lowest percent routed value to unmonitored areas is conservative, as the model
produces more runoff for lower values. Hydraulic conductivity was not adjusted for unmonitored areas.
These unmonitored areas should be considered uncalibrated. The final calibration parameters are summa-
rized in Table 3-1.
Table 3-1. Final Hydrology Parameters Adjusted during Calibration
Parameter
Calibration Subbasin Areas outside
monitored areas AUB_B4 AUB_B86 AUB_B99 AUB_C18 17th and 21st
St. Ponds
Percent impervious
routed to pervious 71 70.8 62 56 70.35 56
Hydraulic conductivity
(in/hr) 0.32 0.14
0.06-0.48 (increased
soil-based values for
each subcatchment by
150 percent)
0.24
D soils increased
from 0.025 to 0.236;
other soil types
increased by 118
percent
unadjusted
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Figure 3-1. BCDF model meter subbasins
3.1.2 Calibration Results
The calibration results are summarized in Table 3-2. The calibration improved the models ability to estimate
flow in the City’s storm drainage system. The models are considered sufficient tools for capital improvement
project development in the areas where problems have been identified, and increase confidence in project
sizing to meet the City’s LOS. In general, goals were met for some events at some locations, but were not
met for all events at all meters. Calibration results for each meter are summarized below.
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AUB_B4. Calibration at this meter did not meet the goals for depth (for all events) and volume and peak flow
for some events. This meter has a large tributary area and calibration could not be improved with the
available information. For the Drainage Plan, there were no problem areas in this calibration subbasin, and
the calibration was considered adequate. If future problems or projects area are identified, additional
calibration events may be warranted.
AUB_B86. Peak flows were under- and over simulated with simulated peaks flows meeting the calibration
criteria for five events. In general, peak volumes were over simulated, while depths were under simulated.
AUB_B99. In general, simulated depths matched observed depths. Peak flow were under simulated while
volumes were over- and under simulated for some events.
AUB_C18. In general, simulated depths matched observed depths. Peak flow and volumes were over- and
under simulated for some events.
Table 3-2. BCDF Flow Monitoring Observed Data Model Calibration Summary
Event Start date Duration
(hr)
Total
rainfall
(in.)
Peak 15-
min
rainfall
(in./hr)
Peak 15-minute flow (cfs) Volume (cf) Maximum Depth (ft)
Calibrated Observed Difference
(%) Calibrated Observed Difference
(%) Calibrated Observed Difference
(%)
AUB_B4
1 2/12/2011 15:00 12 0.55 0.72 33.1 24.5 35 221,200 168,500 31 1.1 2.2 -49
2 2/27/2011 18:00 13.8 0.63 0.24 14.0 15.2 -8 223,500 206,100 8 0.7 1.6 -54
3 3/9/2011 9:00 24 1.16 0.28 17.2 17.0 1 446,300 343,600 30 0.8 1.8 -57
4 3/13/2011 15:00 9 0.37 0.28 14.7 14.6 0 137,800 126,600 9 0.7 1.7 -56
5 3/15/2011 12:45 7 0.24 0.32 11.9 14.7 -19 83,760 64,330 30 0.7 1.7 -60
AUB_B86
1 2/12/2011 15:00 12 0.55 0.72 3.2 2.2 43 18,170 14,970 21 3.7 4.3 -15
2 2/27/2011 18:00 13.8 0.63 0.24 1.5 1.6 -5 20,310 13,600 49 0.7 0.9 -22
3 3/9/2011 9:00 24 1.16 0.28 1.9 1.8 6 37,820 36,590 3 0.8 2.1 -60
4 3/13/2011 15:00 9 0.37 0.28 1.6 1.8 -10 11,970 11,370 5 0.7 1.0 -24
5 3/15/2011 12:45 7 0.24 0.32 1.4 1.6 -10 7,533 7,747 -3 0.7 1.0 -33
AUB_B99
1 2/12/2011 15:00 12 0.55 0.72 3.0 3.2 -5 25,670 21,150 21 1.5 1.8 -15
2 2/27/2011 18:00 13.8 0.63 0.24 1.8 2.1 -16 28,840 28,430 1 0.9 0.8 13
3 3/9/2011 9:00 24 1.16 0.28 2.1 2.5 -18 63,350 66,420 -5 1.0 1.0 6
4 3/13/2011 15:00 9 0.37 0.28 1.8 2.4 -25 17,100 21,420 -20 1.0 0.9 8
5 3/15/2011 12:45 7 0.24 0.32 1.7 2.4 -28 9,895 14,620 -32 0.9 0.9 1
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Table 3-2. BCDF Flow Monitoring Observed Data Model Calibration Summary
Event Start date Duration
(hr)
Total
rainfall
(in.)
Peak 15-
min
rainfall
(in./hr)
Peak 15-minute flow (cfs) Volume (cf) Maximum Depth (ft)
Calibrated Observed Difference
(%) Calibrated Observed Difference
(%) Calibrated Observed Difference
(%)
AUB_C18
1 2/12/2011 15:00 12 0.55 0.72 14.9 13.3 13 96,730 66,090 46 2.1 2.2 -5
2 2/27/2011 18:00 13.8 0.63 0.24 7.2 7.3 0 98,880 79,470 24 1.3 1.4 -4
3 3/9/2011 9:00 24 1.16 0.28 9.3 9.8 -5 192,200 198,400 -3 1.5 1.5 -1
4 3/13/2011 15:00 9 0.37 0.28 7.9 7.6 4 59,840 59,460 1 1.4 1.4 -4
5 3/15/2011 12:45 7 0.24 0.32 6.9 8.6 -20 37,260 42,420 -12 1.2 1.5 -19
The calibration results for the pond depths are summarized in Table 3-3. In general, goals were not met for
all events at both ponds. However, they were met for the longest, largest event, December 11, 2010, and
therefore the calibration was deemed acceptable.
Table 3-3. 17th and 21st Street Pond Level Data Model Calibration Summary
Event Start date Duration (hr) Total
rainfall (in.)
Peak 15-
min rainfall
(in./hr)
Maximum Depth (ft)
Calibrated Observed Difference (%)
17th Street Pond
1 11/6/2010 1:40 49.3 0.89 0.16 1.02 0.99 -3
2 11/17/2010 11:35 26.2 0.41 0.24 n/a n/a n/a
3 11/30/2010 3:00 31 0.42 0.12 n/a n/a n/a
4 12/7/2010 20:45 77.4 1.28 0.36 0.95 1.30 38
5 12/11/2010 9:15 133.5 3.16 0.28 2.80 2.70 -4
6 12/24/2010 14:25 54.3 0.81 0.12 0.95 1.23 29
7 12/27/2010 11:45 28.8 0.27 0.08 0.45 0.39 -12
21st Street Pond
1 11/6/2010 1:40 49.3 0.89 0.16 3.00 2.05 -32
2 11/17/2010 11:35 26.2 0.41 0.24 1.38 1.19 -14
3 11/30/2010 3:00 31 0.42 0.12 1.97 1.45 -26
4 12/7/2010 20:45 77.4 1.28 0.36 3.07 3.15 3
5 12/11/2010 9:15 133.5 3.16 0.28 5.06 4.94 -2
6 12/24/2010 14:25 54.3 0.81 0.12 2.68 2.87 7
7 12/27/2010 11:45 28.8 0.27 0.08 1.44 1.60 11
n/a = not applicable as observed pond level data indicated no water in the pond during this event.
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3.2 P Subbasin Model Calibration
The P subbasin model was calibrated with anecdotal flooding information and pump run times exported from
the SCADA data of the single pump at the W Main Street Pump Station. The anecdotal flooding information
includes reports of ponding on private property (because of private conveyance), flooding in the vicinity of
the existing pump station prior to its construction, and surcharging in the storm conveyance south of West
Main St.
Model calibration goals were set as a maximum 15 percent difference between simulated event volumes
observed volumes. A comparison of peak flows was not a calibration goal as the observed pump station
peaks were limited by the pump capacity, which is not a useful measure of simulated peak flows.
The calibration effort focused on adjusting model parameters to match modeled and observed volumes at
the pump station, and corroborating observed flooding. A time series representing the observed volume was
developed using pump run times from the SCADA data and assuming a pump capacity of 1,200 gallons per
minute (gpm).
Initial comparisons of observed and simulated volumes indicated the presence of base flow in the system. A
0.5 cfs flow was added to the node immediately upstream of the pump station to represent this base flow
contribution from the subbasin. In addition, initial comparisons of model results to anecdotal flooding
locations indicated more simulated flooding than observed. The simulated peak flows were adjusted to
match the observed flooding by reducing impervious area for the entire subbasin, and adjusting the parame-
ters for subcatchments with detention facilities. The P basin contains several large, privately-owned and
maintained detention facilities that were not explicitly modeled because the details of their design, construc-
tion, and operation/maintenance are unknown. Model parameters for the subcatchments with detention
facilities were adjusted in an effort to provide some simulated peak attenuation attributed to the detention
facilities. These adjustments included reducing basin width and routing some of the runoff from impervious
areas to pervious areas, instead of directly to the outlet. The parameter adjustments made during calibration
are described below:
1. Reduce impervious area for all subcatchments. The model was calibrated to observed data by adjusting
the effective impervious area, which was estimated using the Sutherland equations and GIS-derived total
impervious area.
2. Reduce subcatchment width to account for detention facilities. The model subcatchment width was
reduced by estimating the ratio between width and length as 0.417. The ratio was derived from model
trial runs to produce sufficient peak flow attenuation to reduce simulated flooding in locations with no
reported flooding.
3. Routing runoff from impervious areas to pervious areas to account for detention facilities. For sub-
catchment with detention, 100 percent of runoff from the impervious surfaces was routed to pervious
surfaces prior to being routed to the subcatchment outlet.
Parameter adjustments made during calibration to the area tributary to the pump station, which is about 15
percent of the P basin, were applied basin-wide. While land uses are similar for both the area tributary to
the pump station and other portions of the basin, these areas not tributary to the pump station should be
considered uncalibrated.
3.2.1 Calibration Results
The calibration results are summarized in Table 3-4. All events met the calibration goal, which indicates the
calibrated model is effective at matching observations, and is a suitable tool for capital project development.
However, the calibrated model constitutes about 15% of the P basin, and the remaining modeled area is
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considered uncalibrated. The uncertainty associated with the simulated flows for the uncalibrated portion of
the P basin should be accounted for when developing capital projects.
Table 3-4. W Main Street Pump Station Observed Data Model Calibration Summary
Event Start date Duration (hr) Total rainfall
(in.)
Peak 15-min
rainfall (in./hr)
Volume (cf)
Calibrated Observed Difference (%)
1 11/18/2013 0:10 24 1.12 0.2 111,400 103,700 7
2 12/1/2013 3:00 24 0.54 0.2 88,730 82,400 8
3 12/22/2013 0:05 24 0.44 0.08 86,610 81,300 7
4 1/2/2014 15:00 24 0.39 0.16 82,250 77,310 6
5 1/11/2014 0:00 24 0.95 0.4 101,800 116,400 -13
6 1/29/2014 3:00 24 1.37 0.24 120,700 121,400 -1
7 2/23/2014 21:00 24 0.53 0.12 96,700 100,300 -4
9 3/2/2014 12:05 24 0.88 0.2 99,730 106,100 -6
10 3/16/2014 0:05 24 1.20 0.2 107,700 114,600 -6
11 3/29/2014 15:00 24 0.85 0.36 114,200 112,100 2
Table 3-5 summarizes the parameters adjusted to calibrate the P subbasin model.
Table 3-5. Final Hydrology Parameters Adjusted during Calibration
Parameter Subcatchments without
detention facility
Subcatchments with
detention facility
Percent impervious reduction -55% - 55%
Subbasin width W = area/L where length estimated as longest
flow path W = area/L, where W:L = 1:24
Subarea routing to outlet 100% of impervious area routed to
pervious areas
3.3 Estimating Flows for Project Development
The models were used to determine appropriate flows or events for developing capital improvement projects
to address the identified problems.
3.3.1 Level of Service
The City’s stormwater LOS goals were used to evaluate modeled existing conditions and capital improvement
project scenarios:
1. The City seeks to manage stormwater runoff within the public right-of-way (ROW) to allow access to and
functionality of critical services such as hospitals, fire and police stations, Emergency Operations Center,
maintenance and operations, and city hall. The LOS to allow access to and functionality of critical ser-
vices translates to limiting surface water flooding that will disrupt the function of critical facilities (i.e.,
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with floodwaters reaching the building structure, damaging the structure, and permitting no in-
gress/egress) with an annual chance of occurrence of no greater than 1 percent (i.e., an average recur-
rence interval of 100 years).
4. The City seeks to manage stormwater runoff within the public ROW to preserve mobility on major trans-
portation routes (i.e., arterial roads) and residential roads. The LOS for preserving mobility on major
transportation routes means limiting flooding disruption that inundates city roadways to an impassable
level with an annual chance of occurrence of no greater than 4 percent (i.e., an average recurrence in-
terval of 25 years).
5. The City seeks to manage stormwater runoff from the public ROW to protect real property structures
(e.g., residences and businesses). The LOS for protecting real property structures means limiting flooding
(surface water from ROW runoff entering premises and damaging building structures) to an annual
chance of occurrence of no greater than 2 percent (i.e., an average recurrence interval of 50 years).
3.3.2 Flow Frequency Determination
For the newly calibrated PCSWMM models, a frequency analysis was completed for each model by perform-
ing a long-term simulation (from 1948 to 2014) to determine the 2 percent and 4 percent exceedance
storms (one-in-50-year and one-in-25-year flows, respectively). These storms were used as design storms to
identify ways to alleviate existing drainage problems through capital improvements that meet the LOS.
For the long term simulations, the hydraulic networks of the models were modified so that there were no
restrictions to flow and there was free discharge at outfalls. As a result, all runoff could be conveyed without
substantial system storage and attenuation.
The event peak flows from the simulations were selected in PCSWMM with two event-based criteria, mini-
mum inter-event time (time between peak storms) of 12 hours and a flow threshold (varies by subbasin). The
peak flows were ranked, and the flow frequencies were established with the Cunnane plotting position
estimators. The events associated with the 25- and 50-year peak flows were used to size storm drainage
conveyance in order to meet the relevant LOS. The results of the flow frequency analysis for the BCDF and P
subbasin models are provided in Table 3-6 and Table 3-7.
Table 3-6. BCDF Model Frequency Analysis Summary
Peak flow rank Event start date/time Peak event flow (cfs) Return period (yr)
1 10/20/2003 3:55 83.7 110.5
2 11/4/1998 19:25 75.1 41.5
3 11/4/2006 15:15 72.6 25.5
4 1/9/1990 4:35 68.6 18.4
5 11/17/2003 22:10 61.3 14.4
6 11/24/1990 5:25 61.3 11.8
7 10/5/1981 23:15 56.9 10.0
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Table 3-7. P Subbasin Model Frequency Analysis Summary
Event volume
rank
Peak flow
rank
Event start
date/time
Peak event flow
(cfs)
Event total volume
(MG)
Return period
(yr)
1 1 10/20/2003 9:20 21.8 8.1 110.1
4 2 11/5/2006 23:45 18.3 6.8 41.3
42 3 11/4/2006 15:15 17.9 2.0 25.4
16 4 1/9/1990 4:25 17.5 3.9 18.4
10 5 10/5/1981 23:10 16.61 5.4 14.4
13 6 11/24/1990 4:25 16.49 4.4 11.8
14 7 11/18/2003 10:15 14.88 4.3 10.0
For the WWHM models, the 25-year peak flows were estimated within the model using a Bulletin 17B flood
frequency method (U.S. Department of the Interior Geological Survey. 1982). These flows were used with
Manning’s equation of flow to size new and replaced pipe for capital improvement projects in the OO
subbasin.
The analysis with the HEC-RAS model was not based on a flow frequency determination. Instead, a range of
typical flows (from 1 to 10 cfs) were used to demonstrate the impact of the capital improvement project on
water surface elevations (Brown and Caldwell, 2015).
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Section 4: Annexation Area Desktop Evaluation
BC performed a review of the stormwater infrastructure in the City of Auburn’s West Hills OO drainage
subbasin to identify system easement and infrastructure gaps, and to develop capital improvement projects
to address two reported drainage issues. The OO subbasin is one of 18 drainage subbasins added to the City
of Auburn’s storm drainage system with the annexation of the West Hills and Lea Hill areas from King County
in 2008. The evaluation was completed in the 00 subbasin, and not other annexed subbasins, because the
system inventory had been completed and there were two identified drainage problems. The review was
based on information collected from site visits to the known problem areas, a desktop analysis using GIS,
and anecdotal information from City staff.
4.1 Methodology
Guidelines were developed so that the assessment could be performed consistently across the subbasin,
and could be applied across other subbasins in the future. The assessment was completed primarily in GIS
to identify potential gaps in the storm drainage system in the OO subbasin.
4.1.1 Assessment Guidelines
Guidelines were developed that reflect the Storm Drainage Utility service and planning expectations and are
intended to complement the LOSs identified in the Drainage Plan:
1. The City will seek to obtain easements for City-owned infrastructure (pipe, culvert, catch basin, or
manhole) located on private property.
2. When addressing an identified drainage problem, the City will seek to contain roadway runoff to the ROW
to the extent feasible.
3. When addressing an identified drainage problem or reviewing development plans, the City will field-
investigate potential infrastructure gaps and evaluate the need for additional drainage facilities.
4.1.2 GIS-Based Methodologies
Using the guidelines, potential easements and infrastructure gaps in the OO subbasin were identified using
City GIS data, 2012 aerial photography, and Google Earth software imagery. For potential easement gaps, a
spatial analysis was completed in GIS to identify City-owned infrastructure on private property.
To identify potential infrastructure gaps, subbasins were delineated to drainage outfalls. Then major drain-
age pathways were traced upstream based on topography (2-foot contour data), storm drainage infrastruc-
ture, road network, and aerial photos. Ten major pathways were identified. As pathways were traced, gaps
were identified. Paved roadways and drainage features (i.e. interior outfalls) not directly contributing to the
main drainage pathway were also reviewed. Paved roadways were observed from Google Earth and interior
outfalls are outfalls that discharge flows between subbasins and not out of the OO subbasin.
4.2 Results
The assessment revealed three types of gaps: (1) easement gaps for public infrastructure on private proper-
ty, (2) infrastructure gaps along major drainage pathways, and (3) infrastructure gaps along minor drainage
pathways. The gaps and their occurrence in the OO subbasin are described below. Figure 4-1 shows the
locations of the identified gaps within the OO subbasin, as well as the subbasin delineation and subbasin
outfalls, and locations with known problems for which capital improvement projects are planned.
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Appendix C - H&H Modeling and Evaluation.docx
Easements. Eleven potential easement gaps were identified. Of the 11 potential easement gaps, 2 are
planned to be procured as part of two proposed 6-year capital improvement projects in the Drainage Plan,
Projects 5A and 5B (Figure 4-1).
Major Drainage Pathways. Gaps along major drainage pathways were identified downstream of two interior
outfalls. One is the drainage gap downstream of outfall 705-OO383. Based on topographic data, the channel
appears to be located on private property. However, the channel location is not mapped in GIS, and is not
observable from aerial photographs or Google Earth and should be field confirmed. There are no reported
problems with the infall, outfall, or extent of the assumed channel. Another identified gap in a major drain-
age pathway is the area downstream of outfall 505-OO800. This outfall is the downstream end of a daylight-
ed pipe that discharges directly to the surface onto the property to the north. This infrastructure gap is being
addressed with Project 5B in the Drainage Plan.
Minor Drainage Pathways. Gaps in the minor drainage pathways include runoff from paved roadways or
where conveyance infrastructure ends and appears to discharge to adjacent parcels. There are no reported
problems in areas with identify gaps in minor drainage pathways.
!(
!(
#*
#
#
#
#
#*
#
#
#
#
#*
#
#
#
CreekMill
5A
5B
505-OO591
505 -OO612
505-OO5 85
704-OO979
605-OO800
806-NNN64
805-OO343
704-O O968
705 -OO383
805 -OO396
804-OO459
705-OO103 6
806-PPP106
705-O O1084
S R 18
51ST AVE S
4
6
T
H
P
L
S
PEASLEY CANYON RD S
55TH AVE S
SR 167
W ST NW
S 316TH ST
S 300TH PL
58TH AVE S
S 328TH ST
52ND AVE S
54TH AVE S
U ST NW
S 331ST ST
S 336TH ST
S 300TH ST
V ST NW
56TH AVE S
S 318TH ST
S
3
2
4
T
H
S
T
53RD AVE S
HI CREST DR
T ST NW
S 312TH ST
S 305TH ST
S 303RD PL
S 319TH ST
S 3 1 4 T H S T
S 302N D PL
53RD PL S
R ST NW
S 3 20T H ST
U
C
T
N
W
S 322ND PL
52ND AVE SE
57TH PL S
58
TH
PL S
WEST VALLEY HWY NW
AA
BY
D
R
N
W
15TH ST NW
S 329TH PL
12TH CT NW
S 324TH PL
52ND PL S
9TH CT NW
S 321ST ST
64TH AVE S
56T
H PL S51ST CT S
S 308TH ST
S 325TH ST
57TH AVE S
S 301ST CT
W ST NW
52ND AVE S
58TH PL S
5
8
T
H
A
V
E S
51ST AVE S
51ST AVE S
SR 18
S 324TH S T
53RD PL S
SR 167
52ND AVE S
S 305TH ST
54TH AVE S
S 318TH ST
SR 18
55TH AVE S
R ST NW
AABY DR NW
COMP REHENSIVE STORM DR AINAGE PLAN
1 inch = 900 feet
April 2015
LEGEND
!(Storm Node
Storm Pipe
Storm Culvert
Storm Channe l
#Subbasin Outfall
#*In terior Outfa ll
Storm Deten tion Site
!(Project L ocation and ID
Potential Ease ment
Potential Major Pa thway Gap
Potential Minor Pa thway Gap
Auburn City Boundary
Basin OO Boundary
Subc atch ment bou ndary
P:\Auburn
\14529
5 Auburn Stormwater Comp Plan\GIS\M
XD\HHModelTech
Memo\
AuburnStorm_Fig4-1(AA
).mxd
900 0 900 1,800Feet
Figure 4-1Subbasin OOPotential Drainage System GapsIdentified during Desktop Evaluation±
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4.3 Summary and Recommendations
This desktop evaluation is a high-level review of GIS data and aerial photography to identify potential gaps in
the storm drainage system in recently annexed to the City of Auburn from King County. The evaluation was
completed for the OO subbasin where the storm drainage system was recently inventoried and there are two
reported drainage problems. Identified gaps are intended to assist planning efforts associated with devel-
opment review and investigative efforts should flooding problems arise. The evaluation was also used during
the development of two capital improvement projects: Project 5A, West Hills Drainage Improvements at S
330th St. and 46th Pl. S and 5B, West Hills Drainage Improvements near S 314th St. and 54th Ave. S.
The approach can be applied to other recently annexed areas when the storm drainage system inventory has
been completed or if a drainage problem is reported. If drainage problems are reported in other annexation
area subbasins, they could be addressed with one of the general improvements listed in Table 4-1.
Also, as the data inventory for the recently annexed areas is completed, the City may identify more easement
gaps. The City may want to develop a program to identify where easements are needed, and work with the
property owners to obtain easements.
Table 4-1. Potential Annexation Area Storm Drainage Improvements
Drainage improvement Benefit Implementation considerations
Pervious pavement Proactive for flow reduction
Most cost-effective for new
projects rather than rehab or as
new BMP on existing roads
Low infiltrative soils will require an underdrain.
Not appropriate for roads with heavy vegetative debris or moss
growth.
ROW bioretention cells Proactive for flow reduction
Low infiltrative soils will require an underdrain.
Higher maintenance requirements.
Pipe and ditch extensions Connect problem area to the
existing system to provide flow
conveyance
Consider impact on downstream system and outfall.
Culvert inspection and
maintenance
Maintenance may be able to
improve the conveyance capacity
and address the issue
Inspection may reveal need for culvert replacement.
May result in additional downstream flows.
Culvert replacement Damaged or undersized culvert
could be replaced to reduce
flooding
May need to increase culvert size based on subbasin land use.
May result in changes to connecting infrastructure.
Ditchline grading Ditch conveyance capacity could
be restored
May result in additional downstream flow. Consider impact on
downstream system and outfall.
Asphalt berms or curb and
gutter
Berms could be used to direct flow
to the storm drainage system
May result in additional downstream flow. Consider impact on
downstream system and outfall.
Inlet placement or replace-
ment
Capturing flow at additional
locations or replacing a damaged
inlet could reduce flooding
May result in additional downstream flow. Consider impact on
downstream system and outfall.
Move pipe alignment from
private property to ROW
Provides City with access to its
infrastructure
If pipe is upsized when moved, conveyance capacity may be
increased and may result in additional downstream flow. Consider
impact on downstream system and outfall.
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Appendix C - H&H Modeling and Evaluation.docx
Section 5: Summary
BC performed H&H modeling for nine known drainage problems within the City of Auburn’s stormwater
system. The preparatory work included updating existing PCSWMM models and building new models in
WWHM and HEC-RAS for smaller-scale analyses. Models were updated or developed with use of several data
sources including City GIS data, technical reports, record and construction drawings stormwater infrastruc-
ture; and regional agency climatology, soil, and topographic data.
BC performed calibration on subbasin models with observed data, the BCDF and P subbasin models. The
models were used to perform long-term model simulations to estimate peak flow events to perform flow
frequency analyses and establish design event flows for each modeled subbasin. The models were used to
develop planning-level capital improvement projects to address identified drainage problems that meet the
City’s LOS goals for storm drainage capacity.
After the City has completed the system inventory, a more comprehensive modeling effort can be completed,
to evaluate City facilities in regards to the LOS.
BC also performed a review of the stormwater infrastructure in the annexation area West Hills OO drainage
subbasin to identify potential easement and infrastructure gaps and to develop capital improvement pro-
jects to address two reported drainage issues. The review was based on information collected from site visits
to the known problem areas, a desktop analysis using GIS, and anecdotal information from City staff. The
evaluation methods can be applied to other recently annexed areas after the storm drainage system inven-
tory has been completed or if a drainage problem has been reported.
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Appendix C - H&H Modeling and Evaluation.docx
References
Auburn City Code (ACC). 2009. http://www.codepublishing.com/wa/auburn/.
Brown and Caldwell, 2015. Hydrologic Model Development and Calibration, Alternative Flow Control Standards for Mill Creek
Basin, DRAFT Technical Memorandum.
Brown and Caldwell, December 2009, Amended December 2011. City of Auburn Comprehensive Stormwater Drainage Plan.
Prepared for the City of Auburn by Brown and Caldwell.
EPA. 2010. Storm Water Management Model User’s Manual, Version 5.0. EPA/600/R-05/040. July 2010.
Natural Resources Conservation Center (NRCS). June 1986. Urban Hydrology for Small Watershed, Technical Release 55 (TR-
55). United States Department of Agriculture, Natural Resources Conservation Service, Conservation Engineering Divi-
sion.
Reid Middleton. April 2011. Auburn Airport Storm Drainage System Inventory, Airport Drainage System Plan – Drawing Set.
Prepared for the City of by Reid Middleton 728 134th St SW, Suite 200, Everett, WA 98204.
Reid Middleton. December 2013. Auburn Airport Storm Drainage System Inventory, Storm Drainage System Problems and
Solutions Technical Memorandum. Prepared for the City of by Reid Middleton 728 134th St SW, Suite 200, Everett, WA
98204.
Sutherland, R.C. 2000. Methods for estimating the effective impervious area of urban watersheds. Technical Note #58 from
Watershed Protection Techniques 2(1) 282-284.
U.S. Department of the Interior Geological Survey. 1982. Guidelines for Determining Flood Flow Frequency, Bulletin #17B of
the Hydrology Subcommittee.
Comprehensive Storm Drainage Plan
D-1
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document.
Auburn Drainage Plan Draft - Appendices.docx
Appendix D: SEPA Compliance