HomeMy WebLinkAbout20040316001787 STORM EASEMENT 031604I ,
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Return Address:
City of Auburn
City Clerk
25 West Main 20040316001787
Auburn, WA 98001 PACIFIC NW TIT EAS 34.00
PAGE001 OF 016
03/16/2004 14:08
KING COUNTY, WA
EXCISE TAX NOT REQUIRED
K)n~ Co. R cords DivfsIon
By Deputy
i
oOct)
Above this line reserved for recording information.
STORM WATER EASEMENT AND MAINTENANCE AGREEMENT
FAC03-0030 j ~ 2 PN W-t~
Wr7 6 M- 12--
Reference # (if applicable): N/A
Grantor/Borrower: Junior Achievement of Greater Puget Sound, a
Washington Nonprofit Corporation
Grantee/Assignee/Beneficiary: City of Auburn
Legal Description/STR: SE'/, 24-21N-03E
Assessor's Tax Parcel ID##: 242104-9096
VIC
THIS EASEMENT AND AGREEMENT made and entered into this
day of
,o,6 , , 2004, by and between the City of Auburn, a municipal corporation of King
County, Washington, hereinafter referred to as "CITY" and Junior Achievement of Greater Puget
Sound, A Washington Nonprofit Corporation, hereinafter referred to as "PROPERTY OWNER".
WHEREAS, PROPERTY OWNER has applied for certain permits with the CITY for the
construction of facilities at Junior Achievement South Campus located at 15th Street SE &
Perimeter Road, which create impervious surface; and "a''1 ~!s)1,~ re I(r're,1 fe.
WHEREAS, the PROPERTY OWNER will complete~a storm-s.ystem~$ ed it°~~ ora
as to its f V'+ t ii:1e.
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
Storm Water Easement & Maintenance Agreement
page I of 16
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 an easement over, under 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. FAC03-0030, 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" and incorporated herein by this reference,
and shall be of benefit to the City storm utility system.
Section 2, HEIRS, SUCCESSORS AND ASSIGNS
This Agreement shall be binding upon the heirs, successors and assigns of the parties.
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 "B" 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 he/she/they/it shall 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.
Storm Water Easement & Maintenance Agreement
Page 2 of 16
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.
EXECUTED as of the date first written above.
CITY OF AUBURN
0, r'? ~OpvU,e,~Y
CITY ENGINEER Dfite
. 94~n~'~
President
PjM. 4~X=0.
Secretary STATE OF WASHINGTON)
) ss
COUNTY OF KING )
I certify that I know or have satisfactory evidence that -DAVII? C %a e is the
person who appeared before me, and said person acknowledged that e_ he signed this
instrument, on oath stated that he/she as authorized to execute the instrument and
acknowI d Jed it as the Q,e_I i dQA,+
of a 1 t.;ICIA zae t~-1 Ea~7T , a non--profit
corporation, to be the free and voluntary act of such party for the uses and purposes mentioned
in this instrument.
Dated c;2 In Jab0L1
T` ` U y P,
• NOTA 0 .
_A &)C-l 0)lrefo
''9~~•:~y17 2o~a• Notary Public in and for the State of shington
Residing at G 114 1,
My appointment expires tT 17
Storni Water Easement & Maintenance Agreement
Page 3 of 16
STATE OF WASHINGTON)
) ss
County of King )
I certify that I know or have satisfactory evidence that Dennis Selle 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 CITY ENGINEER of THE
CITY OF AUBURN to be the free and voluntary act of such party for the uses and purposes
mentioned in this inst ent.
Dated 2-2-q-0
fA,E~F~~~4ti
p. o~~,~ss~o • qs,
%
c v N4Tg9 -g
A ~
noc
sit
4f~ NING.
Z ait~ ) -
Notary Public in and for the State of Washington
Residing at fatuMela'✓
My appointment expires 1662S-017
CP/bi
File: #945
REF. H:Development\\Forms\Legal Documents
Storm Water Easement & Maintenance Agreement
Page 4 of 16
EXHIBIT `A'
LEGAL DESCRIPTION
JUNIOR ACHIEVEMENT PARCEL
That portion of Lot 13 of City of Auburn Lot Line Adjustment No. LLA03-0004, as recorded
under Recording No. 20030321002048, Records of King County, Washington, being a portion of
Section 24, Township 21 North, Range 4 East, Willamette Meridian, King County, Washington,
more particularly described as follows:
COMMENCING at the Northeast corner of Lot 12 of said Lot Line Adjustment;
THENCE South 88°49'47" West along the North line thereof a distance of 85.00 feet to the
Northeast corner of said Lot 13 and the POINT OF BEGINNING;
THENCE CONTINUING South 88°49'47" West along said North line a distance of 303.00 feet;
THENCE South 45°21'00" West, 55.85 feet;
THENCE South 13°18'25" West, 66.29 feet to the beginning of an 885.00-foot-radius curve to
the right;
THENCE along the arc of said curve, passing through a central angle of 12°55'08", an arc
distance of 199.55 feet;
THENCE South 26113'33" West, 207.22 feet;
THENCE South 63°43'34" East, 74.35 feet;
THENCE North 88°50'36" East, 248.89 feet;
THENCE South 01°09'24" East, 70.03 feet;
THENCE North 88°50'30" East, 241.88 feet to the East line of said Lot 13;
THENCE North 01°11'00" West along said East line, 476.98 feet;
THENCE South 88°49'47" West, 10.02 feet;
THENCE North 01°10'13" West, 75.00 feet to the beginning of a 20.00-foot-radius curve to the
left;
THENCE along the arc of said curve, passing through a central angle of 90°00'00", an arc
distance of 31.42 feet;
THENCE North 0I'l0' 13" West, 5.00 feet to the POINT OF BEGINNING.
Storm Water Easement & Maintenance Agreement
Page 5 of 16
EXHIBIT "B"
STORMWATER POLLUTION PREVENTION PLAN
for
Junior Achievement South Campus
700 15th Street S.W.
Auburn, Washington
FAC#03-0030
G RA#03-0024
SEP#03-0022
Site Address:
The project is located in the SE 1/4 of Section 24 and the NE 1/4 of Section 25,
Township 21 Range 4 East, W.M. at the Southeast corner of 15th Street S.W.
and Perimeter Road. The Tax Parcel number is 242104-9096.
Introduction:
This storm drainage report has been prepared to address the City of Auburn's
site development and storm drainage requirements for the proposed Junior
Achievement South Campus facility located at the southeast corner of 15th
Street S.W. and Perimeter Road. The site has an area of approximately 17.8
acres and is currently developed as Boeing Building 1701 and the associated
parking areas and utility systems. The subject site will be developed as
commercial use.
The subject site will be developed with a Junior Achievement South Campus
facility building along with the associates parking areas, landscaping, storm
drainage, and utility system improvements.
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 building and pavement areas in a series of catch basins. This
water will be conveyed by storm drainage pipe to a storm water detention/water
quality facility located in the southwest corner of the project site. Here the storm
water will be released into a tightline system and is conveyed south approximate
1-1/2 miles to an existing wetland.
Storm Water Easement & Maintenance Agreement
Page 6 of 16
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
No. 1 - Detention Pond
No. 4 - Control Structure/Flow Restrictor
No. 5 - Catch Basins
No. 6 - Debris Barrier
No. 7 - Energy Dissipaters
No. 11 - Wetpond
(Department of Ecology Storm Water Manual, August 2001)
Treatment BMP'S
A two-celled detention/wetpond) has been installed to treat runoff for
conventional pollutants. The wetpond 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. Additional volume and
flow control has been incorporated to meet Boeing Company requirements.
The City of Auburn Utilities Section is to review and approve any changes to this
stormwater 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 Utilities Sections.
Storm Water Easement & Maintenance Agreement
Page 7of16
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 seasonal 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 detention/wetpond must be
properly maintained. Be careful to avoid introducing landscape fertilizer to
receiving waters or groundwater. If wetpond side slopes become eroded over 2
inches 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:
David G. Moore
Junior Achievement
212 Plaza 600 Building
600 Steward Street
Seattle, WA 98101
(206) 296-2600
Design Engineer:
Barghausen Consulting Engineers
18215 - 72nd Avenue South
Kent, WA 98032
(425) 251-6222
Contact: Jay S. Grubb, P.E.
Plan and/or Information Updates:
The City of Auburn Utilities Section is to review and approve any changes to this
stormwater 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 Utilities Sections.
Storm Water Easement & Maintenance Agreement
Page 8 of 16
INSPECTION/MAINTENANCE CHECKLIST
STRUCTURE
DATE OF INSPECTION/MAINTENANCE
Results/
Maintenance
Date
Inspection
All Catch Basins
Results
Maintenance
Done
Storm Detention/
Inspection
Wet and
Results
Maintenance
Done
Inspection
Conveyance Pipes
Results
Maintenance
Done
Flow Control
Inspection
Structure
Results
Maintenance
Done
Inspection
Fence
Results
Maintenance
Done
Inspection
Debris Barrier
Results
Maintenance
Done
Inspection
Energy Dissipaters
Results
Maintenance
Done
Storm Water Easement and Maintenance Agreement
Page 9 of 16
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.1 - Detention Ponds
Maintenance
Defect
Conditions When Maintenance Is
Results Expected When
Component
Needed
Maintenance Is Performed
General
Trash & Debris
Any trash and debris which exceed 5
Trash and debris cleared from site.
cubic feet per 1,000 square feet (this
is about equal to the amount of trash
it would take to fill up one standard
size garbage can). In general, there
should be no visual evidence of
dumping.
If less than threshold all trash and
debris will be removed as part of next
scheduled maintenance.
Poisonous
Any poisonous or nuisance
No danger of poisonous vegetation
Vegetation and
vegetation which may constitute a
where maintenance personnel or the
noxious weeds
hazard to maintenance personnel or
public might normally be. (Coordinate
the public.
with local health department)
Any evidence of noxious weeds as
Complete eradication of noxious weeds
defined by State or local regulations.
may not be possible. Compliance with
State or local eradication policies
(Apply requirements of adopted IPM
required.
policies for the use of herbicides).
Contaminants
Any evidence of oil, gasoline,
No contaminants or pollutants
and Pollution
contaminants or other pollutants
present.
(Coordinate removal/cleanup with
local water quality response agency).
Rodent Holes
Any evidence of rodent holes if
Rodents destroyed and dam or berm
facility is acting as a dam or berm, or
repaired. (Coordinate with local health
any evidence of water piping through
department; coordinate with Ecology
dam or berm via rodent holes.
Dam Safety Office if pond exceeds 10
acre-feet.)
Storm Water Easement and Maintenance Agreement
Page 10 of 16
No.1- Detention Ponds
Maintenance
Defect
Conditions When Maintenance Is
Results Expected When
Component
Needed
Maintenance Is Performed
Beaver Dams
Dam results in change or function of
Facility is returned to design function.
the facility.
(Coordinate trapping of beavers and
removal of dams with appropriate
permitting agencies)
Insects
When insects such as wasps and
Insects destroyed or removed from
hornets interfere with maintenance
site.
activities.
Apply insecticides in compliance with
adopted IPM policies
Tree Growth
Tree growth does not allow
Trees do not hinder maintenance
and Hazard
maintenance access or interferes
activities. Harvested trees should be
Trees
with maintenance activity (i.e., slope
recycled into mulch or other beneficial
mowing, silt removal, vectoring, or
uses (e.g., alders for firewood).
equipment movements). If trees are
not interfering with access or
Remove hazard Trees
maintenance, do not remove
If dead, diseased, or dying trees are
identified
(Use a certified Arborist to determine
health of tree or removal
requirements)
Side Slopes
Erosion
Eroded damage over 2 inches deep
Slopes should be stabilized using
of Pond
where cause of damage is still
appropriate erosion control measure(s);
present or where there is potential for
e.g., rock reinforcement, planting of
continued erosion.
grass, compaction.
Any erosion observed on a
If erosion is occurring on compacted
compacted berm embankment.
berms a licensed civil engineer should
be consulted to resolve source of
erosion.
Storage Area
Sediment
Accumulated sediment that exceeds
Sediment cleaned out to designed
10% of the designed pond depth
pond shape and depth; pond reseeded
unless otherwise specified or affects
if necessary to control erosion.
inletting or outletting condition of the
facility.
Liner (If
Liner is visible and has more than
Liner repaired or replaced. Liner is fully
Applicable)
three 1/4-inch holes in it.
covered.
Storm Water Easement and Maintenance Agreement
Page 1 I of 16
No.1 - Detention Ponds
Maintenance
Defect °
Conditions'"When Maintenance Is
Results Expected When~,v
Component
Needed
Maintenance Is Performed
Pond Berms
Settlements
Any part of berm which has settled 4
Dike is built back to the design
(Dikes)
inches lower than the design
elevation.
elevation.
If settlement is apparent, measure
berm to determine amount of
settlement.
Settling can be an indication of more
severe problems with the berm or
outlet works. A licensed civil
engineer should be consulted to
determine the source of the
settlement.
Piping
Discernable water flow through pond
Piping eliminated. Erosion potential
berm. Ongoing erosion with potential
resolved.
for erosion to continue.
(Recommend a Geotechnical
engineer be called in to inspect and
evaluate condition and recommend
repair of condition.
Tree Growth
Tree growth on emergency spillways
Trees should be removed. If root
creates blockage problems and may
system is small (base less than 4
cause failure of the berm due to
inches) the root system may be left in
uncontrolled overtopping.
place. Otherwise the roots should be
removed and the berm restored. A
Tree growth on berms over 4 feet in
licensed civil engineer should be
height may lead to piping through the
consulted for proper berm/spillway
berm which could lead to failure of
restoration.
the berm.
Piping
Discernable water flow through pond
Piping eliminated. Erosion potential
berm. Ongoing erosion with
resolved.
potential for erosion to continue.
(Recommend a Geotechnical
engineer be called in to inspect and
evaluate condition and recommend
repair of condition.
Erosion
See "Side Slopes of Pond"
Storm Water Easement and Maintenance Agreement
Page 12 of 16
No. 2 - Control Structure/Flow Restrictor
Maintenance
Defect
Condition When Maintenance is Needed
Results Expected
Component
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 up
Structure in correct
to 10% from plumb).
position.
Connections to outlet pipe are not watertight
Connections to outlet
and show signs of rust.
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.
Cleanout Gate
Damaged or Missing
Cleanout gate is not watertight or is missing.
Gate is watertight
and works as
designed.
Gate cannot be moved up and down by one
Gate moves up and
maintenance person.
down easily and is
watertight.
Chain/rod leading to gate is missing or
Chain is in place and
damaged.
works as designed.
Gate is rusted over 50% of its surface area.
Gate is repaired or
replaced to meet
design standards.
Orifice Plate
Damaged or Missing
Control device is not working properly due
Plate is in place and
to missing, out of place, or bent orifice plate.
works as designed.
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 the
Pipe is free of all
potential of blocking) the overflow pipe.
obstructions and
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 13 of 16
No. 3 - Catch Basins
Maintenance
Defect',
Conditions When Maintenance is Needed
Results Expected When
4component
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 free
blocking more than 1 /3 of its height.
of trash or debris.
Dead animals or vegetation that could
No dead animals or
generate odors that could cause complaints
vegetation present within
or 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
separation 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
secure at basin wall.
joint 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
No vegetation blocking
more than 10% of the basin opening.
opening to basin.
Storm Water Easement and Maintenance Agreement
Page 14 of 16
No. 3 - Catch Basins
Maintenance
defect
''Conditions When Maintenance is Needed ,
Results Expected When
Component
Maintenance 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.
Catch basin cover is
Cover
Place
Any 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
Cover can be removed by
to Remove
after applying normal lifting pressure.
one maintenance person.
(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,
standards and allows
misalignment, rust, cracks, or sharp edges.
maintenance person safe
access.
Metal Grates
Grate opening
Grate with opening wider than 718 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 15 of 16
No. 4 - Wetponds
Maintenance
Defect,.,,, .
Condition WhenaMaintenance V
Results Expected. When Maintenance
Component
is Needed
is Performed
General
Water level
First cell is empty, doesn't hold
Line the first cell to maintain at least 4
water.
feet of water. Although the second cell
may drain, the first cell must remain full to
control turbulence of the incoming flow
and reduce sediment resuspension.
Trash and
Accumulation that exceeds 1
Trash and debris removed from pond.
Debris
CF per 1000-SF of pond area.
Inlet/Outlet
Inlet/Outlet pipe clogged with
No clogging or blockage in the inlet and
Pipe
sediment and/or debris
outlet piping.
material.
Sediment
Sediment accumulations in
Sediment removed from pond bottom.
Accumulation
pond bottom that exceeds the
in Pond
depth of sediment zone plus 6-
Bottom
inches, usually in the first cell.
Oil Sheen on
Prevalent and visible oil sheen.
Oil removed from water using oil-
Water
absorbent pads or vactor truck. Source of
oil located and corrected. If chronic low
levels of oil persist, plant wetland plants
such as Juncus effusus (soft rush) which
can uptake small concentrations of oil.
Erosion
Erosion of the pond's side
Slopes stabilized using proper erosion
slopes and/or scouring of the
control measures and repair methods.
pond bottom, that exceeds 67
inches, or where continued
erosion is prevalent.
Settlement of
Any part of these components
Dike/berm is repaired to specifications.
Pond
that has settled 4-inches or
Dike/Berm
lower than the design elevation,
or inspector determines
dike/berm is unsound.
Internal Berm
Berm dividing cells should be
Berm surface is leveled so that water
level.
flows evenly over entire length of berm.
Overflow
Rock is missing and soil is
Rocks replaced to specifications.
Spillway
exposed at top of spillway or
outside slope.
Storm Water Easement and Maintenance Agreement
Page 16 of 16