HomeMy WebLinkAbout20030113000703 STORM EASEMENT 011303/I J. 13 2-
Return Address:
City of Auburn
City Clerk 2003011303
T
25 West Main PAGE 001 OF 017 EAS
35 • 00
COUMTY,
Auburn, WA 98001 K1/O-1/2003 09 j44
Said document(s) were filed Apr
record by Pacific Northwest Title as
aOcornmodation only. It has not bwn
examined as to proper execwtlon or
as to its affect upon title.
Above this line reserved for recording information.
STORM WATER EASEMENT AND MAINTENANCE AGREEMENT
FAC02.0015
Reference # (if applicable): N/A Additional on page:
Grantor/Borrower: M and U Development, LLC 2)
Additional on page:
Grantee/Assignee/Beneficiary: City of Auburn
Legal Description/STR: NE 1/a, 23-21 AAE Additional on page:
Assessor's Tax Parcel 1D#: 232104-9027 & 9039
l1 /35 l N W T V y 0,401 ~ l'
HIS EA~E- MlENT AND AGREEMENT made and entered into this day of
{v~, W 20 p Z,-by and between the City of Auburn, a municipal corporation of
King County, Washington, hereinafter referred to as "CITY" and M and O Development, LLC,
hereinafter referred to as "PROPERTY OWNER".
WHEREAS, PROPERTY OWNER has applied for certain permits with the CITY for the
construction of facilities at Hinshaw's Motorcycle Shop located at 1611 West Valley Highway
South 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
Stormwater Easement & Maintenance Agreement
Page 1 of 17
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. FAC02-0015, 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 Stormwater 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.
Section 4, ACKNOWLEDGMENT OF OTHER ENFORCEMENT ACTIONS
Stormwater Easement & Maintenance Agreement
Page 2 of 17
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
ACTING CITY ENGINEER
Owner Date
Owner
STATE OF WASHINGTON )
)ss.
COUNTY OF KING )
Date
I certify I have know or have satisfactory evidence that AOACL14 Cyr
is/are the person(s) who appeared before me, and said person(s) acknowledged that he/she/they signed
this instrument on oath stated that he/she/they was/were authorized to execute the instrument and
acknowledge as the Y' of the
M 4 Q DQV2 OR e t L-L . a limited liability company,
to be the free and voluntary act of such party for the uses and purposes mentioned in the instrument.
Dated / a 41-0 2-
NOTARY PUBUG
STATE OF WASHINGTON - • COMMISSION EXPIRES Notary Public in and for the State of Washington
NOVEMBER 13.2006 residing at /KAAK
My appointment expires l ^l3^ NO
Stormwater Easement & Maintenance Agreement
Page 3 of 17
STATE OF WASHINGTON)
)ss.
County of King )
I certify that I know or have satisfactory evidence that EA "f 0' s Sp- 1( E_ 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 ACTING CITY
ENGINEER of THE CITY OF AUBURN to be the free and voluntary act of such party for the uses and
purposes mention d in this instrument.
Dated 'z/°4 23
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Q'P• sio
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Notary Public in and for the State of Washingto
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Stormwater Easement & Maintenance Agreement
Page 4 of 17
EXHIBIT A
LEGAL DESCRIPTIONS
TAX PARCEL NO. 2321049027
REVISED LOT 3A, PER CITY OF AUBURN LOT LINE ADJUSTMENT NO. LLA-01-0007,
AS RECORDED UNDER RECORDING NO. 2001 1 106001 193, RECORDS OF KING
COUNTY, WASHINGTON.
TAX PARCEL NO. 2321049039
REVISED LOT 3, PER CITY OF AUBURN LOT LINE ADJUSTMENT NO. LLA-01-0007, AS
RECORDED UNDER RECORDING NO. 20011106001193, RECORDS OF KING COUNTY,
WASHINGTON.
Stormwater Easement & Maintenance Agreement
Page 5 of 17
EXHIBIT B
STORMWATER POLLUTION PREVENTION PLAN
For
Hinshaw's Motorcycle Store
SEPA# 01-0016
FAC# 02-0015
GRA# 02-0004
Site Address:
The project is located in SW 1/4, NE 1/4, Section 23 - Township 21 N - Range 4
East, W.M. 1611 West Valley Highway South, Auburn, WA 98001. The Tax
Parcel # 2321049027 & 2321049039.
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 Hinshaw's Motorcycle Store located at 1611 West Valley Highway
South, Auburn, WA 98001. The site has an area of approximately 2.86 acres
and is currently undeveloped. The subject site will be developed as a motorcycle
sales and repair facility.
The subject site will have a two-story, 36,965 sf Hinshaw Motorcycle retail,
repair, and office building. The building will cover 0.64 acres, associated parking
will cover 1.58 acres, and the rest of the site will be landscaped.
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
detention tank located under the paved parking on the east portion of the site.
Here the storm water will be released into 12" drainage line which will flow into a
bioswale. The flow will be released from the bioswale into a 12" storm line that
releases water in the northeast corner of the site into a wetland on the property
to the north.
Stormwater Easement & Maintenance Agreement
Page 6 of 17
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 / wet pond, 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. 3 -Closed Detention Systems (TanksNaults)
No. 4 - Control Structure/Flow Restrictor
No. 5 - Catch Basins
No. 8 - Typical Biofiltration Swale
(Department of Ecology Storm Water Manual, August 2001).
Treatment BMP'S
A 100-foot bioswale has been installed to treat runoff for conventional pollutants.
The bioswale was designed to treat the 2-year developed flow from the upstream
detention tank for water quality treatment. In addition, the detention tank 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 Utilities Section is to review and approve any changes to this
storm water Pollution Prevention Plan prior to changes in its implementa-tion.
Additionally, any changes in ownership or person of responsibility are to be
reported to the City Utilities Sections.
Stormwater Easement & Maintenance Agreement
Page 7 of 17
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 bioswale must be properly
maintained. Be careful to avoid introducing landscape fertilizer to receiving
waters or groundwater. If wet pond 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:
Hinshaw Motorcycle
Ron Orr
1602 West Valley Highway South
Auburn, WA 98001
Design Engineer:
Rupert Engineering Inc
Dave Dormier
1519 West Valley Highway North, Suite 101
Auburn, WA 98001
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.
(Changes to ownership shall be reported to the City of Auburn's Utilities Section.)
Stormwater Easement & Maintenance Agreement
Page 8 of 17
INSPECTION/MAINTENANCE CHECKLIST
STRUCTURE
DATE,OF'INS
PECTCON/MAIN
TENAIN
Results/
Maintenance
Date
Inspection
MH #2
Results
Inspection
Results
Maintenance
MH #5
Done
Inspection
Results
Maintenance
MH #7
Done
Maintenance
Done
Inspection
MH #8
Results
Maintenance
Done
Inspection
CB #1
Results
Maintenance
Done
Inspection
CB #2
Results
Maintenance
Done
Inspection
CB #3
Results
Maintenance
Done
Inspection
CB #4
Results
Maintenance
Done
Inspection
CB #5
Results
Maintenance
Done
Storm Water Easement and Maintenance Agreement
Page 9 of 17
STRUCTURE
DATE OF INSPECTION/MAINTENANCE '::`~'~y4::~ l ~l ,
Inspection
CB #6
Results
Maintenance
Done
Inspection
CB #7
Results
Maintenance
Done
Inspection
CB #8
Results
Maintenance
Done
Inspection
CB #9
Results
Maintenance
Done
Inspection
CB #10
Results
Maintenance
Done
Inspection
CB #11 :
Results
Maintenance
Done
Inspection
CB #12
Results
Maintenance
Done
Inspection
CB #13
Results
Maintenance
Done
Inspection
CB #14
Results
Maintenance
Done
Inspection
CB #15
Results
Maintenance
Done
Storm Water Easement and Maintenance Agreement
Page 10 of 17
I
,l+f~
STRUCTURE
DATE OF
NS
RE MN, /M'AINTENA'NG
Inspection
CB #16
Results
Maintenance
Done
Inspection
CB #17
Results
Maintenance
Done
Inspection
CB #18
Results
Maintenance
Done
Inspection
Detention Tank
Results
Maintenance
Done
Inspection
Bioswale
Results
Maintenance
Done
Inspection
Conveyance Pipes
Results
Maintenance
Done
Detention Control
Inspection
Structure MH #1
Results
Maintenance
Done
Detention Control
Inspection
Structure MH #3
Results
Maintenance
Done
Detention Control
Inspection
Structure MH #4
Results
Maintenance
Done
Storm Water Easement and Maintenance Agreement
Page I I of 17
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 (Tanks/Vaults)
Maintenance
Defect
Conditions When Maintenance is Needed
tResuits Expected,
Component
`When Maintenance`is
Perforrnei ,
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 from
length of storage vault or any point depth
storage area.
exceeds 15% of diameter.
(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 repaired or
of Shape
more than 10% of its design shape. (Review
replaced to design.
required by engineer to determine structural
stability).
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 is
Damage to Frame
maintenance/inspection personnel
structurally sound.
and/or Top Slab
determines that the vault is not structurally
sound.
Cracks wider than 1/2-inch at the joint of
No cracks more than
any inlet/outlet pipe or any evidence of soil
1/4-inch wide at the
particles entering the vault through the
joint of the inlet/outlet
walls.
pipe.
Storm Water Easement and Maintenance Agreement
Page 12 of 17
No. 3 - Closed Detention Systems (Tanks/Vaults)
Maintenance
Defect'",
Conditions When Maintenance Is Needed''`
Results Expected
Component
When Maintenance Is
Performed
Manhole
Cover Not in Place
Cover is missing or only partially in place.
Manhole is closed.
Any open manhole requires maintenance.
Locking Mechanism
Mechanism cannot be opened by one
Mechanism opens
Not Working
maintenance person with proper tools.
with proper tools.
Bolts into frame 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 design
misalignment, not securely attached to
standards. Allows
structure wall, rust, or cracks.
maintenance person
safe access.
Catch Basins
See "Catch Basins"
See "Catch Basins" (No. 5).
See "Catch Basins"
(No. 5)
(No. 5).
Storm Water Easement and Maintenance Agreement
Page 13 of 17
No. 4 - Control Structure/Flow Restrictor
7Maintenance
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 water tight;
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 14 of 17
No. 5 - Catch Basins
Maintenance
~Defect~ -
Conditions When Maintenance is Needed' '
Results Expected When
Component
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 15 of 17
No. 5 - Catch Basins
Waintenance
Defect
Conditions When Maintenance is Needed
Results Expected When
Component
'4~ _
Maintenance,1S,
-A"
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 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 17
No. 8 -Typical Biofiltration Swale
Maintenance -
Defectors
Condition,When, -
Recommended Maintenance to Correct
Component
Problem
Maintenance is Needed,
'Problem
General
Sediment
Sediment depth exceeds 2
Remove sediment deposits on grass
Accumulation on
inches.
treatment area of the bio-swale. When
Grass
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: remove
swale between storms and
sediment or trash blockages, improve
does not drain freely.
grade from head to foot of swale, remove
clogged check dams, add underdrains or
convert to a wet biofiltration swale.
Flow spreader
Flow spreader uneven or
Level the spreader and clean so that
clogged so that flows are not
flows are spread evenly over entire swale
uniformly distributed through
width.
entire Swale width.
Constant
When small quantities of
Add a low-flow pea-gravel drain the length
Baseflow
water continually flow through
of the Swale or by-pass the baseflow
the swale, even when it has
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 and
Coverage
or eroded patches occur in
correct that condition. Re-plant with plugs
more than 10% of the swale
of grass from the upper slope: plant in the
bottom.
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 3
weeds and other vegetation
to 4 inches. Remove grass clippings.
starts to take over.
Excessive
Grass growth is poor
If possible, trim back over-hanging limbs
Shading
because sunlight does not
and remove brushy vegetation on
reach swale.
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 bioswale.
Debris
accumulated in the bio-swale.
Accumulation
Erosion/Scouring
Eroded or scoured swale
For ruts or bare areas less than 12 inches
bottom due to flow
wide, repair the damaged area by filling
channelization, or higher
with crushed gravel. If bare areas are
flows,
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 17 of 17