HomeMy WebLinkAbout20101006001951 STORM WATER EASEMENT AND MAINTENANCE AGREEMENT 100610 Return Address:
City of Auburn
City Clerk
25 West
Auburn,WA 98001 20101006001951
PACIFIC NW TIT EAS 80.00
PAGE-001 OF 019
10/06/2010 15:29
KING COUNTY, WA
Above this line reserved for recording information.
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STORM WATER EASEMENT AND MAINTENANCE AGREEMENT
FAC08-0009
Reference#(if applicable): N/A
Grantor/Borrower: FONPEE,LLC
Grantee/Assignee/Beneficiary: City of Auburn
Legal Description/STR: NE 1/4 S2—T21 N—R4E jt'
Assessor's Tax Parcel ID#: 022104-9098
gill' 1S EASEMENT AND AGREEMENT made and entered into this /7 day of
L , 2008, by and between the City of Auburn, a municipal corporation
of King County, Washington, hereinafter referred to as "CITY" and FONPEE, LLC
hereinafter referred to as "PROPERTY OWNER".
WHEREAS, PROPERTY OWNER has applied for certain permits with the CITY
for the construction of facilities for Omega-Baja Office & Warehouse Development
located at 3705 West Valley Highway NW, which create impervious surface; and
WHEREAS, the PROPERTY OWNER will complete a storm system; and
WHEREAS, the PROPERTY OWNER and the CITY desire that the storm system
be maintained to provide adequate facilities for controlling both the quantity and quality of
storm drainage; and
WHEREAS, for maintenance of a storm system it is necessary to have appropriate
right-of-way to bring in equipment to conduct maintenance functions; and
WHEREAS, maintenance requirement is a covenant running with the land and
binding upon all heirs, successors and assigns of both parties; and
rah
Storm Water Easement and Maintenance Agreement
Page 1 of 19
WHEREAS, the parties desire that this Agreement be recorded to advise heirs,
successors and assigns of both parties as to the existence of this easement and agreement;
and
WHEREAS, an easement is needed to bring in maintenance equipment; and
WHEREAS, the parties are both desirous of permitting inspection of the storm
system to make certain that it is functioning properly and for purposes of determining the
appropriate repairs.
NOW, THEREFORE, BASED UPON MUTUAL COVENANTS TO BE
DERIVED THE PARTIES AGREE AS FOLLOWS:
Section 1, EASEMENT
PROPERTY OWNER hereby provides a non-exclusive easement to the City for
access, inspection, and maintenance for the purposes of this Agreement and the attached
Storm Water Pollution Prevention Plan, over, under and on that real estate described in
Exhibit "A" & "B" and on that portion of the property as showing on the approved Record
Drawings revised pursuant to construction records for the City of Auburn under Permit No.
FAC08-0009, which record drawings are hereby incorporated by reference as if set out in
full. This easement shall be a burden to that real estate which is legally described and
attached as Exhibit "A" & `B" and incorporated herein by this reference, and shall be a
benefit to the City Storm Drainage Utility System.
Section 2, HEIRS, SUCCESSORS AND ASSIGNS
This Agreement shall be binding upon the heirs, successors and assigns of the
parties.
Storm Water Easement and Maintenance Agreement
Page 2 of 19
Section 3, MAINTENANCE
The PROPERTY OWNER agrees to maintain the storm system in accordance with
the ordinances and all applicable codes of the CITY and the Storm Water Pollution
Prevention Maintenance and Operation Schedule attached as Exhibit "C" and incorporated
herein by this reference. The PROPERTY OWNER does hereby agree that the CITY may
enter onto the property of the PROPERTY OWNER via the easement described above to
inspect and perform necessary maintenance if, after the PROPERTY OWNER is given
notice to maintain, the PROPERTY OWNER fails to maintain. Further, the PROPERTY
OWNER agrees the CITY may enter onto the property of PROPERTY OWNER via the
easement described above to perform emergency maintenance in the event of the storm
system's failure which might result in adverse impacts(s) on public facilities or private
facilities of other property owners. In both events the PROPERTY OWNER agrees to
reimburse the CITY for the costs incurred by the CITY in maintaining the storm system.
Should the CITY incur attorney's fees and/or costs in enforcing the agreement and/or in
maintaining or collecting maintenance fees, the PROPERTY OWNER agrees to pay
reasonable attorney's fees and all costs incurred by the CITY.
Section 4,ACKNOWLEDGMENT OF OTHER ENFORCEMENT ACTIONS
PROPERTY OWNER acknowledges that there may be liability for violations of
codes that could result in additional fines and/or the possibility of incarceration in addition
to the fees for maintenance should violations occur.
Storm Water Easement and Maintenance Agreement
Page 3 of 19
EXECUTED as of the date first written above.
ea. , % G
thorized Signature D e
Authorized Signature Date
STATE OF WASHINGTON)
) ss
COUNTY OF KING )
I certify I have know or have satisfactory evidence that 111 id-loet P . Cutiec,
git are the person(s) who appeared before me, an. :id person(s, acknowledged that
Oahe/they he/they signed this instrument on oath stated ' i . she/,,-y ,f/were authorized to
exec to e instrument and acknowledge as the;.r_/.�: y
of a limited liability company, to be
the ree a voluntary act of such party for the uses and purposes mentioned in the
instrument.
Dated ®,
`v AN+ fie 4 'f
ir ',AA
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Notary Public in and for the State of
WashingN 4BZ
., .:a Residing at ILit ICUr(\ '
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My appointment expires '1 a a0 is
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Storm Water Easement and Maintenance Agreement
Page 4 of 19
CITY OF AUBURN
min Carlaw Drainage g Engineer Draina En ineer Dade
STATE OF WASHINGTON )
)ss.
County of King )
I certify that I know or have satisfactory evidence that Tim Carlaw is the person who
appeared before me, and said person acknowledged that he signed this instrument, on oath
stated that he was authorized to execute the instrument and acknowledged it as the
STORM DRAINAGE ENGINEER of THE CITY OF AUBURN to be the free and
voluntary act of such party for the uses and purposes mentioned in this instrument.
Dated /O/fie
..... ....,, �i
0 SO1r4� '',�� 1 zz� I- c.6. CT y
Ili • , = Notary Pu • in and for the State Washington
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File: 1209
REF. H\Development\Projects\Omega-Baja\Legal Documents\2008
Storm Water Easement and Maintenance Agreement
Page 5 of 19
EXHIBIT `A'
OMEGA-BAJA INDUSTRIAL CONTRACTORS
3705 WEST VALLEY HIGHWAY NW
AUBURN, WA 98001
Tax Parcel No. 0221049098
LEGAL DESCRIPTION
THAT PORTION OF GOVERNMENT LOT 1 AND THE SOUTHEAST QUARTER OF THE
NORTHEAST QUARTER OF SECTION 2,TOWNSHIP 21 NORTH,RANGE 4 EAST,WILLAMETTE
MERIDIAN,IN KING COUNTY,WASHINGTON,DESCRIBED AS FOLLOWS:
COMMENCING ON THE EAST LINE OF SAID GOVERNMENT LOT 1 AT A POINT WHICH IS
SOUTH 01°33'33"WEST,945.12 FEET FROM THE NORTHEAST CORNER THEREOF;
THENCE NORTH 89° 17'33"WEST,428.00 FEET;
THENCE NORTH 01°33'33" EAST, 99.91 FEET TO A POINT ON THE SOUTH LINE OF THE
NORTH 845.12 FEET OF THE NORTHEAST QUARTER OF SAID SECTION 2;
THENCE NORTH 89° 17'33"WEST,ALONG SAID SOUTH LINE, 652.19 FEET TO A POINT ON
THE EAST LINE OF THE WEST 1,524.60 FEET OF THE NORTHEAST QUARTER OF SAID
SECTION 2;
THENCE SOUTH 01° 05'07"WEST ALONG SAID EAST LINE,317.86 FEET TO A POINT ON THE
NORTH LINE OF THE SOUTH 1,236.00 FEET OF THE NORTHEAST QUARTER OF SAID SECTION
2;
THENCE SOUTH 89°55'04"EAST ALONG SAID NORTH LINE,309.58 FEET TO A POINT ON THE
NORTHERLY LINE OF THE M.MARKDAHL ROAD,AS CONVEYED TO KING COUNTY BY DEED
RECORDED IN VOLUME 1167 OF DEEDS, PAGE 133, RECORDING NUMBER 1592515(ALSO
KNOWN AS MEREDITH ROAD OR S.292ND STREET);
THENCE NORTHEASTERLY ALONG SAID NORTHERLY LINE TO THE EAST LINE OF THE
NORTHEAST QUARTER OF SAID SECTION 2;
THENCE NORTH ALONG SAID EAST LINE 95.00 FEET,MORE OR LESS,TO THE POINT OF
BEGINNING;
EXCEPT THE RIGHT OF WAY OF SECONDARY STATE HIGHWAY NO.5M(WEST VALLEY
HIGHWAY);AND EXCEPT THAT PORTION THEREOF CONVEYED TO THE CITY OF AUBURN BY
DEED RECORDED UNDER RECORDING NUMBER 9604220946.
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Storm Water Easement and Maintenance Agreement
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Storm Water Easement and Maintenance Agreement
Page 7 of 19
EXHIBIT `C'
STORM WATER POLLUTION PREVENTION
MAINTENANCE and OPERATION SCHEDULE
for
OMEGA-BAJA GARAGE & OFFICE, PHASE 1
SEPA NO. 07-0017
FAC NO. 08-0009
GRA NO. 07-0013
Site Address:
The project is located in NE QTR of Section2, Township 21N Range 4
East, W.M., 3705 West Valley Highway NW, Auburn, WA 98001. The tax
parcel number is 0221049098.
Introduction:
This storm drainage technical information report has been prepared to
address the City of Auburn's site development and storm drainage
requirements for the proposed Omega-Baja Garage & Office, Phase 1
located at 3705 West Valley Highway NW, Auburn, WA 98001 . The site
has an area of approximately 6.25 acres and is currently being used by
Omega-Baja Industrial Contractors under a temporary use permit from the
City. An old house on the property has been converted into a temporary
office for this purpose. The east end of the site has been cleared, but is
undeveloped. The west end of the site is wooded and undeveloped. The
subject site will be (developed as the headquarters of Omega-Baja
Industrial Contractors, and will contain an office building, a garage for
vehicle maintenance, and a storage shed.
The subject site has a temporary entrance off of South 292nd Street
(37th Street NW). The only existing building is an old house that is being
used as temporary office space by Omega-Baja Industrial Contractors. It
has well water and a septic tank. All existing development will be
demolished or abandoned upon completion of Phase 1 construction.
Storm Water Easement and Maintenance Agreement
Page 8 of 19
According to the City of Auburn's Construction Standards for storm water
management, the city requires storm water quantity and quality control to all
proposed developments. We have proposed to collect all of the storm
water runoff from the landscaped, building and pavement areas in a series
of catch basins. This water will be conveyed by storm drainage pipe to a
storm water vault that will provide both storm water detention and water
quality treatment, located on the eastern portion of the site. Here the storm
water will be released into a 24" diameter proposed storm drainage line
running to a new catch basin on West Valley Highway at the northeast
corner of the site. From there, the storm water will be conveyed in a 30"
diameter pipe (to be a new part of the public system) northward along the
west side of West Valley Highway to an existing catch basin adjacent to the
Span Alaska office buildings.
Plan Goal:
The specific purpose for the storm water facility is to minimize pollution that
is typically associated with modern development. In general, pollution from
motor vehicles and pollution generated from erosion. Attached to this
narrative is a maintenance manual, which offers guidelines to the owner for
storm water facility maintenance.
Prevention BMP'S:
The catch basins shall have stenciled on them "DUMP NO WASTE —
DRAINS TO STREAM." The owner shall be responsible for sweeping the
lot, installing storm drainage stenciling and provide spill control procedures.
In case of spill call DOE at 1-425-649-7000. The catch basins,
detention/wetpond, and control structures will be visually inspected for
accumulation of debris and silt and will be maintained as required by this
pollution prevention plan and attachments.
• Maintenance Standards for Drainage Facilities (from the Department of
Ecology Storm Water Manual, August 2001)
No. 3 — Closed Detention Systems (Tanks/Vaults)
No. 4 — Control Structure/Flow Restrictor
No. 5 — Catch Basins
No. 8 — Typical Biofiltration Swale
No. 12 — Wetvaults
Storm Water Easement and Maintenance Agreement
Page 9 of 19
Treatment BMP'S:
A wet vault has been installed to treat runoff for conventional pollutants.
The wet vault was designed to treat 64% of the 2-year storm event (water
quality storm) for water quality treatment. In addition, the detention pond
was designed to detain the volume created from releasing half the existing
2-year, 10, 25, and 100-year storm events, while holding the developed 2-
year, 10, 25, and 100-year storm volumes.
The City of Auburn Storm Drainage Utility section is to review and approve
any changes to this Storm Water Pollution Prevention Plan prior to changes
in its implementation. Additionally, any changes in ownership or person of
responsibility are to be reported to the City of Auburn Storm Drainage Utility
section.
Inspection/Maintenance:
Regular inspections of the drainage facilities should be carried out twice per
year, in the spring and fall. The responsible party should keep records of
these inspections available for review by the City. Additional inspections
may be required after severe storms.
Routine maintenance of the site will include mowing, care of landscaping
and the removal of trash and debris from the drainage system. The parking
lots and driveways should be kept clean and in repair. Events such as
major storms or heavy winds will require immediate inspections for
damages.
To ensure proper water quality and treatment, the wet vault must be
properly maintained. Be careful to avoid introducing landscape fertilizer to
receiving waters or groundwater. If wetpond side slopes become eroded
over 2" deep, stabilize by using appropriate erosion control measures (e.g.,
rock reinforcement, planting of grass, compaction).
Catch basins shall be cleaned when sump is 1/3' full of sediment or debris.
Person of Responsibility:
Mike Cotter
Omega-Baja Industrial Contractors
3705 West Valley Highway NW
Auburn, WA 98001
Tel: (253) 804-6000
Storm Water Easement and Maintenance Agreement
Page 10 of 19
Design Engineer:
Barry Knight, P.E.
CTS Engineers
1412 — 112th Avenue NE, Suite 102
Bellevue, WA 98004
Tel: (425) 455-7622
Plan and/or Information Updates:
The City of Auburn Storm Drainage Utility section is to review and approve
any changes to this Storm Water Pollution Prevention Plan prior to changes
in its implementation. Additionally, any changes in ownership or person of
responsibility are to be reported to the City Storm Drainage Utility section.
INSPECTION/MAINTENANCE CHECKLIST
° Y' iiiiti air � i
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STRUCTURE D � # 5
a`�Yh e 'fa,
Results/
Maintenance Date
Inspection
All Catch Basins Results
Maintenance
Done
Storm Detention/ Inspection
Wet Vault Results
Maintenance
Done
Inspection
Conveyance Pipes Results
Maintenance
Done
Flow Control Inspection
Structure Results
Maintenance
Done
Biofiltration Swale Inspection
Results
Maintenance
Done
Storm Water Easement and Maintenance Agreement
Page 11 of 19
Maintenance Standards for Drainage Facilities:
The facility-specific maintenance standards contained in this section are
intended to be conditions for determining if maintenance actions are
required as identified through inspection. They are not intended to be
measures of the facility's required condition at all times between
inspections. In other words, exceeding these conditions at any time
between inspections and/or maintenance does not automatically constitute
a violation of these standards. However, based upon inspection
observations, the inspection and maintenance schedules shall be adjusted
to minimize the length of time that a facility is in a condition that requires a
maintenance action.
No. 3—Closed Detention Systems(TanksNaults)
Maintenance Defect Conditions When Maintenance is Needed Results
Component Expected When
Maintenance is
Performed,
Storage Area Plugged Air Vents One-half of the cross section of a vent is Vents open and
blocked at any point or the vent is damaged. functioning.
Debris and Sediment Accumulated sediment depth exceeds 10% All sediment and
of the diameter of the storage area for 1/2 debris removed
length of storage vault or any point depth from storage
exceeds 15%of diameter. area.
(Example: 72-inch storage tank would
require cleaning when sediment reaches
depth of 7 inches for more than 1/2 length of
tank.)
Joints Between Any openings or voids allowing material to All joint between
Tank/Pipe Section be transported into facility. tank/pipe sections
are sealed.
(Will require engineering analysis to
determine structural stability).
Tank Pipe Bent Out Any part of tank/pipe is bent out of shape Tank/pipe
of Shape more than 10%of its design shape. repaired or
(Review required by engineer to determine replaced to
structural stability). design.
Vault Structure Cracks wider than 1/2-inch and any Vault replaced or
Includes Cracks in evidence of soil particles entering the repaired to design
Wall, Bottom, structure through the cracks, or specifications and
Damage to Frame maintenance/inspection personnel is structurally
and/or Top Slab determines that the vault is not structurally sound.
sound.
Cracks wider than 1/2-inch at the joint of No cracks more
any inlet/outlet pipe or any evidence of soil than 1/4-inch wide
particles entering the vault through the at the joint of the
walls. inlet/outlet pipe.
Storm Water Easement and Maintenance Agreement
Page 12 of 19
No. 3—Closed Detention Systems(Tanks/Vaults)
•Maintenance Defect Conditions When Maintenance is Needed Results
Component Expected When
Maintenance
Performed
Manhole Cover Not in Place Cover is missing or only partially in place. Manhole is
Any open manhole requires maintenance. closed.
Locking Mechanism One maintenance person with proper tools Mechanism opens
Not Working cannot open mechanism. Bolts into frame with proper tools.
have less than 1/2 inch of thread(may not
apply to self-locking lids).
Cover Difficult to One maintenance person cannot remove lid Cover can be
Remove after applying normal lifting pressure. Intent removed and
is to keep cover from sealing off access to reinstalled by one
maintenance. maintenance
person.
Ladder Rungs Unsafe Ladder is unsafe due to missing rungs, Ladder meets
misalignment, not securely attached to design standards.
structure wall, rust, or cracks. Allows
maintenance
person safe
access.
Catch Basins See"Catch Basins" See"Catch Basins"(No. 5). See"Catch
(No. 5) Basins"(No. 5).
No. 4—Control Structure/Flow Restrictor
Maintenance Defect Condition When Maintenance is Results Expected
Component Needed When Maintenance
is Performed
General Trash and Debris Material exceeds 25%of sump depth or 1 Control structure
(Includes Sediment) foot below orifice plate. orifice is not
blocked. All trash
and debris removed.
Structural Damage Structure is not securely attached to Structure securely
manhole wall. attached to wall and
outlet pipe.
Structure is not in upright position (allow Structure in correct
up to 10%from plumb). position.
Connections to outlet pipe are not Connections to
watertight and show signs of rust. outlet pipe are
watertight;structure
repaired or replaced
and works as
designed.
Any holes, other than designed holes, in Structure has no
the structure. holes other than
designed holes.
Storm Water Easement and Maintenance Agreement
Page 13 of 19
No. 4—Control Structure/Flow Restrictor
Maintenance Defect Condition When Maintenance is Results Expected
Component Needed Wit Maintenance
Is PertmIrted
Cleanout Gate Damaged or Missing Cleanout gate is not watertight or is Gate is watertight
missing. and works as
designed.
One maintenance person cannot move Gate moves up and
up and down gate. down easily and is
watertight.
Chain/rod leading to gate is missing or Chain is in place
damaged. and works as
designed.
Gate is rusted over 50%of its surface Gate is repaired or
area. replaced to meet
design standards.
Orifice Plate Damaged or Missing Control device is not working properly Plate is in place and
due to missing, out of place, or bent works as designed.
orifice plate.
Obstructions Any trash, debris, sediment, or vegetation Plate is free of all
blocking the plate. obstructions and
works as designed.
Overflow Pipe Obstructions Any trash or debris blocking(or having Pipe is free of all
the potential of blocking)the overflow obstructions and
pipe. works as designed.
Manhole See"Closed See"Closed Detention Systems"(No. 3). See"Closed
Detention Systems" Detention Systems"
(No. 3). (No. 3).
Catch Basin See"Catch Basins" See"Catch Basins"(No. 5). See"Catch Basins"
(No. 5). (No. 5).
Storm Water Easement and Maintenance Agreement
Page 14 of 19
No. 5—Catch Basins
Maintenance Defect Conditions When Maintenance Is Needed Results Expected,
Component When Maintenance is
performed
General Trash& Trash or debris which is located immediately No Trash or debris
Debris in front of the catch basin opening or is located immediately in
blocking inletting capacity of the basin by front of catch basin or on
more than 10%. grate opening.
Trash or debris(in the basin)that exceeds 60 No trash or debris in the
percent of the sump depth as measured from catch basin.
the bottom of basin to invert of the lowest pipe
into or out of the basin, but in no case less
than a minimum of six inches clearance from
the debris surface to the invert of the lowest
pipe.
Trash or debris in any inlet or outlet pipe Inlet and outlet pipes
blocking more than 1/3 of its height. free of trash or debris.
Dead animals or vegetation that could No dead animals or
generate odors that could cause complaints or vegetation present within
dangerous gases(e.g., methane). the catch basin.
Sediment Sediment(in the basin)that exceeds 60 No sediment in the catch
percent of the sump depth as measured from basin.
the bottom of basin to invert of the lowest pipe
into or out of the basin, but in no case less
than a minimum of 6 inches clearance from
the sediment surface to the invert of the
lowest pipe.
Structure Top slab has holes larger than 2 square Top slab is free of holes
Damage to inches or cracks wider than 1/4 inch. and cracks.
Frame and/or
Top Slab (Intent is to make sure no material is running
into basin).
Frame not sitting flush on top slab, i.e., Frame is sitting flush on
separations of more than 3/4 inch of the frame the riser rings or top slab
from the top slab. Frame not securely and firmly attached.
attached
Fractures or Maintenance person judges that structure is Basin replaced or
Cracks in unsound. repaired to design
Basin Walls/ standards.
Bottom
Grout fillet has separated or cracked wider Pipe is regrouted and
than 1/2 inch and longer than 1 foot at the joint secure at basin wall.
of any inlet/outlet pipe or any evidence of soil
particles entering catch basin through cracks.
Settlement! If failure of basin has created a safety, Basin replaced or
Misalignment function, or design problem. repaired to design
standards.
Vegetation Vegetation growing across and blocking more No vegetation blocking
than 10%of the basin opening. opening to basin.
Storm Water Easement and Maintenance Agreement
Page 15 of 19
No. 5—Catch Basins
Maintenance Defect Conditions When Maintenance is Needed Results Expected
Component ;WherrMisdrdenance is
performed
Vegetation growing in inlet/outlet pipe joints No vegetation or root
that is more than six inches tall and less than growth present.
six inches apart.
Contamination See"Detention Ponds" (No. 1). No pollution present.
and Pollution
Catch Basin Cover Not in Cover is missing or only partially in place. Any Catch basin cover is
Cover Place open catch basin requires maintenance. closed.
Locking Mechanism cannot be opened by one Mechanism opens with
Mechanism maintenance person with proper tools. Bolts proper tools.
Not Working into frame have less than 1/2 inch of thread.
Cover Difficult One maintenance person cannot remove lid One maintenance person
to Remove after applying normal lifting pressure. can remove cover.
(Intent is keep cover from sealing off access to
maintenance.)
Ladder Ladder Rungs Ladder is unsafe due to missing rungs, not Ladder meets design
Unsafe securely attached to basin wall, misalignment, standards and allows
rust,cracks, or sharp edges. maintenance person
safe access.
Metal Grates Grate opening Grate with opening wider than 7/8 inch. Grate opening meets
(If Applicable) Unsafe design standards.
Trash and Trash and debris that is blocking more than Grate free of trash and
Debris 20%of grate surface inletting capacity. debris.
Damaged or Grate missing or broken member(s)of the Grate is in place and
Missing. grate. meets design standards.
Storm Water Easement and Maintenance Agreement
Page 16 of 19
No. 8—Typical Biofiltration Swale
Maintenance Defect or Condition When Recommended Maintenance to
Component Problem Maintenance is Needed Correct Problem
General Sediment Sediment depth exceeds 2 Remove sediment deposits on grass
Accumulation on inches. treatment area of the bio-swale.
Grass When finished, swale should be level
from side to side and drain freely
toward outlet. There should be no
areas of standing water once inflow
has ceased.
Standing Water When water stands in the Any of the following may apply:
swale between storms and remove sediment or trash blockages,
does not drain freely. improve grade from head to foot of
swale, remove clogged check dams,
add underdrains or convert to a wet
biofiltration swale.
Flow spreader Flow spreaders uneven or Level the spreader and clean so that
clogged so that flows are not flows are spread evenly over entire
uniformly distributed through swale width.
entire swale width.
Constant When small quantities of Add a low-flow pea-gravel drain the
Baseflow water continually flow through length of the swale or by-pass the
the swale, even when it has base flow around the swale.
been dry for weeks, and an
eroded, muddy channel has
formed in the swale bottom.
Poor Vegetation When grass is sparse or bare Determine why grass growth is poor
Coverage or eroded patches occur in and correct that condition. Re-plant
more than 10%of the swale with plugs of grass from the upper
bottom. slope: plant in the swale bottom at 8-
inch intervals. Or re-seed into
loosened, fertile soil.
Vegetation When the grass becomes Mow vegetation or remove nuisance
excessively tall (greater than vegetation so that flow not impeded.
10-inches);when nuisance Grass should be mowed to a height of
weeds and other vegetation 3 to 4 inches. Remove grass
start to take over. clippings.
Excessive Grass growth is poor If possible,trim back over-hanging
Shading because sunlight does not limbs and remove brushy vegetation
reach swale. on adjacent slopes.
Inlet/Outlet Inlet/outlet areas clogged Remove material so that there is no
with sediment and/or debris. clogging or blockage in the inlet and
outlet area.
Trash and Trash and debris Remove trash and debris from
Debris accumulated in the bio-swale. bioswale.
Accumulation
Storm Water Easement and Maintenance Agreement
Page 17 of 19
No. 8—Typical Biofiltration Swale
Maintenance Defect or Condition When Recommended Maintenance to
Component Problem Maintenance is Needed Correct Problem
Erosion/Scouring Eroded or scoured swale For ruts or bare areas less than 12
bottom due to flow inches wide, repair the damaged area
channelization, or higher by filling with crushed gravel. If bare
flows. areas are large, generally greater than
12 inches wide, the swale should be
re-graded and re-seeded. For smaller
bare areas, overseed when bare spots
are evident, or take plugs of grass
from the upper slope and plant in the
swale bottom at 8-inch intervals.
Storm Water Easement and Maintenance Agreement
Page 18 of 19
No. 12—Wetvaults
Maintenance Detect Condition When Maintenance Results Expected When
Component is Needed Maintenance is Performed
General Trash/Debris Trash and debris accumulated Remove trash and debris from
Accumulation in vault, pipe or inlet/outlet vault.
(includes floatables and non-
floatables).
Sediment Sediment accumulation in vault Remove sediment from vault.
Accumulation in bottom exceeds the depth of
Vault the sediment zone plus 6-
inches.
Damaged Pipes Inlet/outlet piping damaged or Pipe repaired and/or replaced.
broken and in need of repair.
Access Cover Cover cannot be opened or Pipe repaired or replaced to
Damaged/Not removed, especially by one proper working specifications.
Working person.
Ventilation Ventilation area blocked or Blocking material removed or
plugged. cleared from ventilation area. A
specified%of the vault surface
area must provide ventilation to
the vault interior(see design
specifications).
Vault Structure Maintenance/inspection Vault replaced or repairs made so
Damage- personnel determine that the that vault meets design
Includes Cracks vault is not structurally sound. specifications and is structurally
in Walls Bottom, sound.
Damage to Frame
and/or Top Slab
Cracks wider than 1/2-inch at Vault repaired so that no cracks
the joint of any inlet/outlet pipe exist wider than 1/4-inch at the
or evidence of soil particles joint of the inlet/outlet pipe.
entering through the cracks.
Baffles Baffles corroding, cracking, Baffles repaired or replaced to
warping and/or showing signs specifications.
of failure as determined by
maintenance/inspection staff.
Access Ladder Ladder is corroded or Ladder replaced or repaired to
Damage deteriorated, not functioning specifications, and is safe to use
properly, not attached to as determined by inspection
structure wall, missing rungs, personnel. Replace sign warning
has cracks and/or misaligned. of confined space entry
Confined space warning sign requirements. Ladder and entry
missing. notification complies with OSHA
standards.
Storm Water Easement and Maintenance Agreement
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