HomeMy WebLinkAbout2025 - Declaration of Covenant for Inspection and Maintenance of Stormwater Facilities and BMPS - Matthew Patton / City of Tukwila - 20250108000713Instrument Number: 20250108000713 Document:COV Rec: 5338.50 Page -1 of 36
Record Date:1/8/2025 4:13 PM
Electronically Recorded King County, WA EXCISE TAX NOT REQUIRED BY NATHAN HENG, DEPUTY
After Recording .Return to:
City Clerk
City of Tukwila
Tu"'ila, WA 98188
DOCUNMNT TITLE:� Declaration of Covenant for Inspection and Maintenance of
Stac�snwater Facilities and I3MPS
REFERENCE NUMBER(S) OF RELATED
DOCUMENTS: 13
Additional reference numbers at page 2 of document.
GRANTOR: � Matthew Patton
GRANTEE: City of Tukwila, a Washington Municipal Corporation
ABBREVIATED LEGAL DESCRIPTION: RIVERSIDE INTERURBAN TRS PP ACT 39956669 MOBILE
Full legal on page 5 of document.
KING COUNTS' TAX PARCEL NUMBER: 1734060-4182
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -2 of 36
Record Date:1/8/2025 4:13 PM King County, WA
1. Parties
Li This Covenant for Inspection and Maintenance of Stormwater Facilities and Best
Management Practices ("Covenant") is made by and between [property owner(s)], as Grantor, and the City of
Tukwila, a Washington Municipal Corporation, as Grantee. Grantor and Grantee (also denoted as City herein)
are each a Party and collectively the Parties to this Agreement.
RININEM79 MT
2.1 Grantor applied to City for issuance of D22-0289 on 12/14/2023
2.2 Pursuant to TMC 14.30.060, application for and issuance of such permit requires the property
owner to enter into this Covenant.
2.3 The subject of the Covenant is the real property located in King County, Washington, bearing
King County Tax Parcel No. -Z34Do-21.32 and legally described in the attached Exhibit A
incorporated herein ("Property").
2.4 The City approved the applications which consist of the following documents, attached and
incorporated herein:
2.4.1 City issued Permit No. D22-0289 , Exhibit B.
2.4.2 Stormwater Facility/BMP Site Plan, Exhibit C.
2.4.3 Operations & Maintenance Plan including schedule, Exhibit D.
3. Terms of Agreement
NOW THEREFORE, in consideration of the foregoing recitals and other good and valuable
consideration including approval and issuance of City of Tukwila Permit [number and date], the sufficiency
and receipt of which are acknowledged, Grantor hereby irrevocably covenants as follows:
3.1 The foregoing Recitals and references to documents are incorporated as material terms of this
Covenant .
3.2 The Grantor(s) for itself and its successors in interest having any ownership interest in the
Property (collectively Owners) shall at their sole cost and expense retain, uphold, operate, maintain, and repair
the stormwater facilities and best management practices ("BMPs") located on the Property pursuant to the
schedule within the Operations & Maintenance Plan.
3.3 The obligations required under Section 3.2 above shall be taken consistent the following:
3.3.1 The City shall have the right of ingress and egress over those portions of the Property
necessary to perform inspections of the stormwater facilities and BMPs and conduct other activities specified
in this Declaration of Covenant and in accordance with Tukwila Municipal Code ("TMC") 14.30.80, This
right of ingress and egress, right to inspect, and right to perform required maintenance or repair shall be as
provided for in subsection 3.3.2 below.
City of Tukwila
Stormwater Maintenance
Declaration of Covenant
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -3 of 36
Record Date:1/8/2025 4:13 PM King County, WA
33.2 If the City determines that maintenance or repair work is required to be done to any
of the stormwater facilities or BMPs, the Director of Public Works or designee (the "Director") shall give
notice of the specific maintenance and/or repair work required pursuant to TMC 14.30,080. The Director shall
also set a reasonable time in which such work is to be completed by the Owner. If the above required
maintenance or repair is not completed within the time set by the Director, the City may perform the required
maintenance or repair, and is hereby granted access to the Property for such purposes. Written notice will be
mailed to the Owner stating the City's intention to perform such work. This work will not commence until at
least sever, (7) days after such notice is mailed. If, within the sole discretion of the Director, there exists an
imminent or present danger, the seven (7) day notice period will be waived and maintenance and/or repair
work will begin immediately.
3.4 If at any time the City reasonably determines that a stormwater facility or BMP on the
Property presents an imminent hazard, as identified by TMC 14.30.080 and herein incorporated by reference,
the Director or equivalent municipal successor's official may take measures specified therein.
3.5 The Owner shall assume all responsibility for the cost of any maintenance or repair work
completed by the City as described in Covenant. Such responsibility shall include reimbursement to the City
within thirty (30) days of the receipt of the invoice for any such work performed. Overdue payments will
require payment of interest at the current legal rate as liquidated damages. All such costs and expense shall
constitute a lien against the Property.
3.6 The Owners shall obtain a Type C Public Works permit from the City prior to filling, piping,
cutting, or removing vegetation (except in routine landscape maintenance such as replacement of plants and
pretreatment mulch) in open vegetated stormwater facilities (such as swales, channels, ditches, ponds, etc.),
or performing any alterations or modifications to the stormwater facilities and BMPs referenced in this
Covenant. Prior to the final approval and issuance of the new permit, a new Covenant with updated exhibits
reflecting the changes to the stormwater facilities shall be recorded at the Owner's sole cost, and a copy of the
new recorded Declaration of Covenant provided to the City.
3.7 Any notice or consent required to be given or otherwise provided for by the provisions of this
Declaration of Covenant shall be effective upon personal delivery, or three (3) days after mailing by Certified
Mail, return receipt requested, to the address listed below for that party:
To Grantee: To Grantor:
City Clerk Matthew Patton
City of Tukwila 11535 40th Ave S.
6200 Southcenter Blvd. Tukwila, WA 98168
Tukwila, WA 98188
3.8 With regard to the matters addressed herein, this Covenant constitutes the entire agreement
between the parties, and supersedes all prior discussions, negotiations, and all agreements whatsoever whether
oral or written. This Covenant shall be governed by the laws of the State of Washington. Any suit to enforce
or relating to this Covenant shall only be filed in King County Superior Court, King County, Washington, and
the Parties consent to the jurisdiction thereof. In the event of any legal action by either Party relating to this
Covenant, the Parties shall pay their own costs or fees.
City of Tukwila
Stormwater Maintenance
Declaration of Covenant
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -4 of 36
Record Date:1/8/2025 4:13 PM King County, WA
3.9 This Covenant is intended to protect the value and desirability of the real property described
in Exhibit A, promote the efficient and effective management of stormwater drainage, and shall inure to the
benefit of all the citizens of the City and its municipal successors and assigns. References herein to the TMC
shall include subsequent amendments to such statutes and all successor statutes.
3.10 This Covenant shall run with the land and shall be binding upon the Owners as defined in
Section 3.2 above.
3.11 This Covenant may be amended or terminated only with the advance express written consent
of the City as determined pursuant to its discretion.
EXECUTED AND EFFECTIVE as of the date last signed below.
-a
attF6w Patton
Property Owner
DATE: /'
, ��� � �I
r f
t
City of Tukwila
Stormwater Maintenance
Declaration of Covenant
FOR GI2A ''rEE:
City of W;11 -
r
Ta onne.anti ._
21
P ubt
ic Works Director -
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -5 of 36
Record Date:1/8/2025 4:13 PM King County, WA
STATE OF WASHINGTON
ss.
COUNTY OF KING
l certify that I know or have satisfactory evidence that`, ; :. _Jv-
V <is the person who appeared
before me, and said person acknowledged that s/he signed this instrument on behalf ofthe '�
and acknowledged it to be her/his free and voluntary act for the uses and purposes mentioned in this
instrument.
GIVEN UNDER MY HAND AND OFFICIAL SEAL this y_ day of
COUNT' OF MNG
ss.
of Washington;
On this day personally appeared before nuc ` :. to me known to be the
of the CITU € F 'I'[;tsNYiLa a municipal corporation and noncharter
code city with a council -mayor form of government organized pursuant to RCW Title 35A, that executed the
foregoing instrument, and acknowledged such instrument to be her free and voluntary act and deed of said
city for the uses and purposes therein mentioned, and on oath stated that s/he was duly authorized to execute
such instrument.
GIVEN UNDER MY HAND AND OFFICIAL SEAL this L� day of
' 202-x, ,
City of Tukwila
Stormwater Maintenance
Declaration of Covenant
F
Printed Narne
NOTARY PU13LIC in and for the State of Washington, ;
residing at
My Commission Expires
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -6 of 36
Record Date:1/8/2025 4:13 PM King County, WA
City of Tukwila
Stormwater Maintenance
Declaration of Covenant
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -7 of 36
Record Date:1/8/2025 4:13 PM King County, WA
EXHIBIT B
Permit
f attached]
City of Tukwila
Stormwater Maintenance
Declaration of Covenant
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -8 of 36
Record Date:1/8/2025 4:13 PM King County, WA
Stormwater Facility/BMP Site Plan
City of Tukwila
Stormwater Maintenance
Declaration of Covenant
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -9 of 36
Record Date:1/8/2025 4:13 PM King County, WA
Icy: -310
City of Tukwila
Storn3water Maintenance
Declaration of Covenant
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -10 of 36
Record Date:1/8/2025 4:13 PM King County, WA
,�yJiL+4
�syCity of
Washington. -I Deportment of Community Development
6300 Southcenter Boulevard, Suite #100
98188
$ . • 206-431-3670
InspectionScheduling:https://tukw-egov.aspgov.com/BP/index.htmi
Web ! a..�
Parcel No: 7340600182 Permit Number: D22-0289
Address: 11545 40TH AVE S Issue Date: 12/14/2023
Permit Expires On: 6/11/2024
Project Name: Matthew Patton Residence
Owner:
Name: Matthew Patton
Address: 11535 40th Ave So., Tukwila, WA,
98168
Contact Person:
Name:
Matthew Patton
Address:
11535 40th Ave So., Tukwila, WA,
98168
Contractor:
Name:
HI -LINE HOMES
Address:
11306 62ND AVE E, PUYALLUP, WA,
98373
License No:
HILINH*983BD
Phone: (206) 679-3157
Phone: (253) 840-1849
Expiration Hate: 11/8/2025
Lender:
Name: NA
Address:
DESCRIPTION OF WORK:
New 3,700 sq. Ft single family home.
Project Valuation: $537,777.68 Fees Collected: $10,020.59
Type of Fire Protection: Sprinklers: YES
Fire Alarm:
Type of Construction:
Electrical Service Provided by: Tukwila
Occupancy per IBC:
Water District: Tukwila
Sewer District: Valley View
Fees Collected:
Electrical Service Provided by:
Water District:
Sewer District:
Current Codes adopted by the City of Tukwila:
Instrument Number: 20250108000713 Docun/ont:COV Rocz$338.50 Pugo11of36
Record Du1od/N/2#254d3 I'M King County, WA
International Fire Code Edition:
2018
International Building Code Edition:
2018
National Electrical Code:
2020
International Residential Code Edition:
20I8
VVACities Electrical Code:
2020
International Mechanical Code Edition:
2018
WAC 296-4613:
2020
Uniform Plumbing Code Edition:
2018
VVAState Energy Code:
2018
International Fuel Gas Code:
20I8
Public Works Activities:
Channe|izadon/Sthpmg:
[urbCut/Acces$Sidewa|k:
Fire Loop Hydrant:
Flood Control Zone:
Hauling/Oversize Load:
Land Altering: Volumes: Cut: 224 Fill: 224
Landscape Irrigation:
Sanitary Side Sewer: Number: O
Sewer Main Extension:
Storm Drainage:
Street Use:
Water Main Extension: PRIVATE
Water Meter: Yes
All provisions of law and ordinances governing this work will be complied with, whether specified herein or not.
The granting of this permit does not presume to give authority mviolate mcancel the provisions ofany other
state orlocal laws regulating construction ortheperfvnnanceofwnrk.
This permit shall become null and void if the work is not commenced within 180 days for the date of issuance, or if
the work is suspended or abandoned for a period of 180 days from the last inspection.
1: Condition Notes
Z: Work shall beinstalled inaccordance wkhtheapp/mvedoonstrucUondocuments,andanychangesmade
during construction that are not in accordance with the approved construction documents shall be
resubmitted for approval.
3: When special inspection is required, either the owner or the registered design professional in responsible
charge, shall employ a special inspection agency and notify the Building Official of the appointment prior to
the first building inspection. The special inspector shall furnish inspection reports to the Building Official in
atimely manner.
4: A final report documenting required special inspections and correction of any discrepancies noted in the
inspections shall besubmitted tothe Building Official. The final inspection report shall beprepared bythe
approved special inspection agency and shall be submitted to the Building Official prior to and as a
condition offinal inspection approval.
S: All construction shall be done in conformance with the Washington State Building Code and the
Washington State Energy Code.
8: Notify the City ofTukwila Building Division prior to placing any concrete. This procedure is in addition to
any requirements for special inspection.
r Masonry construction shaUbesprcia|inspected.
Instrument Number: 20250108000713 Docun/ont:COV Rocz$338.50 Pugo12of36
Record Du1od/N/2#254d3 PM King County, WA
8: There shall be no occupancy of a building until final inspection has been completed and approved by
Tukwila building inspector. No exception.
9: A Certificate of Occupancy shall be issued for this building upon final inspection approval by Tukwila
building inspector.
IO: All construction noise to be in compliance with Chapter 8.22 of the City of Tukwila Municipal Code. Auopy
can beobtained atCity Hall inthe office ofthe City Clerk.
I!: Water heatershall heanchored o,strapped toresist horizontal displacement due toearthquake motion.
Strapping shall be at points within the upper one-third and lower one-third of the water heater's vertical
dimension. A minimum distance of 4 -inches shall be maintained above the controls with the strapping.
12: VALIDITY OFPERMIT: The issuance or granting of a permit shall not be construed to be a permit for, or an
approval of, any violation of any of the provisions of the building code or of any other ordinances of the City
of Tukwila. Permits presuming to give authority to violate or cancel the provisions of the code or other
ordinances ofthe City ofTukwila shall not bevalid. The issuance ofapermit based unconstruction
documents and other data shall not prevent the Building Official from requiring the correction of errors in
the construction documents and other data.
13: Heat detector required ingarage. per R3I4IlWAC 51-51-O3z4
14: FIRE PERMIT REQ FIRE SPRINKLER
Fire sprinklers required byseparate permit.
15: **^PUBUCWORKS PERMIT [DN0TlOm5***
16: Prior tcconstruction, all utilities /nthe vicinity shall be field located. NOTE: For City nfTukwila utility
locates, call DI1orl'8OO4Z4-5555.
17: Work affecting traffic flows shall be closely coordinated with the Public Works Inspector. Traffic Control
Plans shall besubmitted tothe Inspector for prior approval.
18: The City of Tukwila has an undergrounding ordinance requiring the power, telecommunications, and cable
service lines be underground from the point of connection on the pole to the house.
19: Flagging, signing and coning shall be in accordance with MUTCD for Traffic Control. Contractor shall
provide certified flagmen for traffic control. Sweep orotherwise clean streets tnthe satisfaction ofPublic
Works each night around hauling route (No flushing aUnwed>. Notify Public Works Inspector before z2:UO
Noon on Friday preceding any weekend work.
ZO: Any material spilled onto any street shall becleaned upimmediately.
21: Clean and remove debris from City catch basin inand around hauling routes. Provide adequate temporary
access asnot tointerfere with other vehicle movement orcause trucks totravel over curbs. All vehicles
must make acomplete stop prior toentering public hght-of-way.
22: Temporary erosion control measures shall be implemented as the first order of business to prevent
sedimentation off-site or into existing drainage facilities per Appendix D of the 2021 King County Surface
Water Design Manual.
23: The site shall have permanent erosion control measures in place as soon as possible after final grading has
been completed and prior tothe Final Inspection.
24: From October 1 through April 30, cover any slopes and stockpiles that are 3H:1V or steeper and have a
vertical rise ofzOfeet ormore and will beunworked for greater than I2hours. During this time period,
cover or mulch other disturbed areas, if they will be unworked more than 2 days. Covered material must
bestockpiled onsite atthe beginning ofthis period. Inspect and maintain this stabilization weekly and
immediately before, during and following storms.
25: All private storm drain pipe shall be either concrete or reinforced ADS pipe. Treated corrugated metal pipe
may beused for detention facilities.
26: The property owner is responsible for the maintenance of its storm drainage system and, for this purpose,
shall have a maintenance plan in place and the responsibility for maintenance assigned prior to Public
Works final.
27: The water meter box shall be located within City right-of-way at the property line or a recorded utility
28: Applicant shall obtain sanitary side sewer permit from Valley View District (206-242-3236).
Instrument Number: 20250108000713 Docun/ont:COV Rocz$338.50 Pugo13of36
Record Du1od/N/2#254d3 I'M K]ngCounty, WA
29: Driveways shall comply with City residential standards. Driveway width shall be a 10' minimum and 20'
maximum. Slope shall heamaximum nf15%. Turning radii shall bcaminimum vf5'.
30: The driveway shall be designed and sloped so that drainage from the driveway does not flow onto the
existing road surface.
31: Driveways shall be paved for a minimum distance of 20' from the edge of the existing road pavement.
32: Since the house must have afire sprinkler system installed, it shall beverified inwriting tothe Public Works
Inspector that the fire loop system for the building contains a WA State Department of Health approved
Double Check Valve Assembly (DCVA). This shall be done prior to final inspection. Refer to attached Public
Works Details for I" FIRE/DOMESTIC SERVICE and/or I" FLOW-THROUGH SYSTEM. Backflow device is
optional if a FLOW-THROUGH SYSTEM is installed. Coordinate with the Public Works Inspector.
B: The house fire sprinkler system shall bedesigned byaFire Sprinkler System Designer. Designer shall verify
in writing to the Public Works Inspector that a 3/4 -inch water meter and service line meets domestic water
and fire flow requirements. If domestic water and fire flow requirements are not met, then a 1 -inch water
meter with a 1'inchservice line is required. Refer to attached Public Works Details for I^ FIRE/DOMESTIC
SERVICE and/or 1" FLOW-THROUGH SYSTEM. Coordinate with Public Works Project Inspector.
34: At the discretion of the Project Inspector, an overlay of matching asphalt within trenching, grind pavement,
tninclude pedestrian path, and provide I^overlay may berequired.
35: Pavement mitigation fees may apply to this permit. Amount estimated to be xxx sq. ft. x$^v.uxper sq. ft.=
$x,xxx.xx. Final measurement to be made in the field by the Public Works Inspector prior to Public Works
36: Prior toPublic Works Final, provide storm drainageas-builtplan, storm drainage maintenance plan and
responsibility for maintenance assigned for stormwater treatment and flow control BIVIPs/Facilities.
37: A bond or cash equivalent in the amount of 150% x cost of construction within the City right-of-way made
out tothe City ofTukwila for possible property damages caused byactivite,.
38: A copy of the Certificate of Insurance Coverage (minimum of $2,000,000 naming the City of Tukwila as
additionally insured).
39: Sewer lines shall be laid at least 10 feet horizontally, measured edge to edge, from any existing or proposed
water supply line. The Director may allow a reduction to 5 feet of separation provided the water line is laid
in a separate trench or on an undisturbed earth shelf located on one side of the sewer at such an elevation
that the bottom of the water line is at least 18 inches above the top of the sewer. Install all sanitary sewer
crossings under water lines so that the top of the sewer pipe is at least 18 inches below the bottom of the
water line.
PERMIT INSPECTIONS REQUIRED
Permit Inspection Scheduling: https://tukw-egov.aspgov.com/BP/index.htmi
BACKFLOW WATER
BU|Lo|wGRNAL^~
CONCRETE SLAB
CURB ACCESS 5DVV
o*&8PPnUOpAND WATERPROOF
ENERGY EFF CERT
EROSION MEASURES
EROSION MEASURES FNL
F|ns o PERMIT FINAL
FIRE oPERMIT FINAL
FOOTING
FOOTING DRAINS
FOUNDATION WALL
FRAMING
GAS PIPING FINAL
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -14 of 36
Record Date:1/8/2025 4:13 PM King County, WA
GLAZING
LATH—GYPSUM BOARD
LIGHTING EQUIP CONT
LOWEST FLOOR ELE
MECHANICAL FINAL
MOTOR INSPECTION
PAVING AND RESTORE
PIPE INSULATION
PLANNING FINAL
PLUMBING FINAL
PUBLIC WORKS FINAL
PUBLIC WORKS FINAL
PUBLIC WORKS PRE -CON
ROOF SHEATHING
ROOF—CEILING INSUL
SLAB—FLOOR INSUL
STORM DRAINAGE
STREET USE
UNDERFLOOR FRAMING
WALL INSULATION
WALL SHEATHING—SHEAR
WATER METER - PERM
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -15 of 36
Record Date:1/8/2025 4:13 PM King County, WA
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Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -20 of 36
Record Date:1/8/2025 4:13 PM King County, WA
APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES
NO.5 - CATCH BASINS AND MANHOLES
Maintenance Defect or Problem
Condition When Maintenance is Needed
Results Expected When
Component
Maintenance is Performed
Structure Sediment
Sediment exceeds 60% of the depth from the
Sump of catch basin contains no
I bottom of the catch basin to the invert of the
sediment.
lowest pipe into or out of the catch basin or is
within 6 inches of the invert of the lowest pipe
into or out of the catch basin.
Trash and debris
Trash or debris of more than '% cubic foot which
No Trash or debris blocking or
is located immediately in front of the catch basin
potentially blocking entrance to
opening or is blocking capacity of the catch basin
! catch basin.
by more than 10%.
Trash or debris in the catch basin that exceeds
No trash or debris in the catch basin.
'/s the depth from the bottom of basin to invert
the lowest pipe into or out of the basin.
Dead animals or vegetation that could generate
¢ No dead animals or vegetation
1
odors that could cause complaints or dangerous
present within catch basin.
gases (e.g., methane).
Deposits of garbage exceeding 1 cubic foot in
No condition present which would
. volume.
attract or support the breeding of
insects or rodents.
Damage to frame
'
! Corner of frame extends more than % inch past
Frame is even with curb. I
and/or top slab
curb face into the street (If applicable).
Top slab has holes larger than 2 square inches or
Top slab is free of holes and cracks.
cracks wider than % inch.
Frame not sitting flush on top slab, i.e.,
Frame is sitting flush on top slab.
separation of more than 3/, inch of the frame from
the top slab.
Cracks in walls or
Cracks wider than % inch and longer than 3 feet,
Catch basin is sealed and is
bottom
any evidence of soil particles entering catch
structurally sound,
basin through cracks, or maintenance person
judges that catch basin is unsound.
Cracks wider than % inch and longer than 1 foot
No cracks more than 'la inch wide at
at the joint of any inlet/outlet pipe or any evidence
the joint of inlet/outlet pipe.
of soil particles entering catch basin through
cracks.
Settlement/
Catch basin has settled more than 1 inch or has
Basin replaced or repaired to design
misalignment
rotated more than 2 inches out of alignment.
standards.
Damaged pipe joints
Cracks wider than %-inch at the joint of the
No cracks more than 'l< -inch wide at
inlet/outlet pipes or any evidence of soil entering
the joint of inlet/outlet pipes.
the catch basin at the joint of the inlet/outlet
pipes.
1
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and disposed of
pollution
as oil, gasoline, concrete slurries or paint.
according to applicable regulations. I
�
Source control BMPs implemented if
appropriate. No contaminants
present other than a surface oiE film.
Inlet/Outlet Pipe Sediment
Sediment filling 20% or more of the pipe.
Inlet/outlet pipes clear of sediment.
accumulation
Trash and debris
- -
Trash and debris accumulated in inlet/outlet
No trash or debris in pipes.
pipes (includes floatables and non-floatables)'
- (includes
--
l
Damaged
Cracks wider than '/.-inch at the joint of the
No cracks more than %4 -inch wide at
inlet/outlet pipes or any evidence of soil entering
the joint of the inlet/outlet pipe.
at the joints of the inlet/outlet pipes.
2021 Surface Water Design Manual — Appendix A 7,123/2021
A-9
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -21 of 36
Record Date:1/8/2025 4:13 PM King County, WA
APPENDIX A MAINTENANCE REQUIREMENTS FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES
NO.5 - CATCH BASINS AND MANHOLES
Maintenance
Defect or Problem
Condition When Maintenance is heeded
Results Expected "(hen
Component
Maintenance is Performed
Metal Grates
Unsafe grate opening
Grate with opening wider than 7/a inch.
i Grate opening meets design
(Catch Basins)
standards.
Trash and debris
Trash and debris that is blocking more than 20%
Grate free of trash and debris.
of grate surface.
Damaged or missing
Grate missing or broken member(s) of the grate.
Any open structure requires urgent
Grate is in place and meets design
(
standards.
maintenance.
Manhole Cover/Lid
Cover/lid not in place
Cover/lid is missing or only partially in place.
Cover/lid protects opening to
Any open structure requires urgent
structure.
maintenance.
Locking mechanism
Mechanism cannot be opened by one
I Mechanism opens with proper tools.
Not Working
t maintenance person with proper tools. Bolts
cannot be seated. Self-locking cover/lid does not
work.
Cover/Gd difficult to
One maintenance person cannot remove
Cover/lid can be removed and
Remove
cover/lid after applying 80 lbs. of lift.
reinstalled by one maintenance
person.
7/23/2021 2021 Surface Water Design Manual —Appendix A
A-10
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -22 of 36
Record Date:1/8/2025 4:13 PM King County, WA
APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES
NO.6 - CONVEYANCE PIPES AND DITCHES
Maintenance Defect or Problem
Conditions When Maintenance is Needed
Results Expected When
Component
Maintenance is Performed
Pipes Sediment & debris
Accumulated sediment or debris that exceeds
Water flows freely through pipes.
accumulation
20% of the diameter of the pipe.
Vegetation/roots
Vegetation/roots that reduce free movement of
Water flows freely through pipes.
water through pipes.
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and disposed of
pollution
as oil, gasoline, concrete slurries or paint.
according to applicable regulations.
Source control BMPs implemented if
appropriate. No contaminants
present other than a surface oil film.
Damage to protective
Protective coating is damaged; rust or corrosion
Pipe repaired or replaced.
coating or corrosion
is weakening the structural integrity of any part of
pipe.
Damaged
Any dent that decreases the cross section area of
Pipe repaired or replaced.
pipe by more than 20% or is determined to have
weakened structural integrity of the pipe.
Ditches Trash and debris
Trash and debris exceeds 1 cubic foot per 1,000
Trash and debris cleared from
t square feet of ditch and slopes.
ditches.
Sediment
Accumulated sediment that exceeds 20% of the
Ditch cleaned/flushed of all sediment
accumulation
design depth.
and debris so that it matches design.
Noxious weeds
Any noxious or nuisance vegetation which may
Noxious and nuisance vegetation
constitute a hazard to County personnel or the
removed according to applicable
public.
regulations. No danger of noxious
vegetation where County personnel
or the public might normally be.
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and disposed of
pollution
as oil, gasoline, concrete slurries or paint.
according to applicable regulations.
Source control BMPs implemented if
appropriate. No contaminants
present other than a surface oil film.
Vegetation
Vegetation that reduces free movement of water
Water flows freely through ditches.
through ditches.
Erosion damage to
Any erosion observed on a ditch slope.
Slopes are not eroding.
slopes
Rock lining out of
One layer or less of rock exists above native soil
Replace rocks to design standards.
1 place or missing (If
area 5 square feet or more, any exposed native
Applicable)
soil.
2021 Surface Water Design Manual — Appendix A 7/23/2021
A-11
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -23 of 36
Record Date:1/8/2025 4:13 PM King County, WA
2021 Surface Water Design Manual — Appendix A 7/23/2021
A-35
APPENDIX A MAINTENANCE REQUIREMENTS FOR FLOW CONTROL, CONVEYANCE, AND WQ FACILITIES
NO. 25 - DR ELL BMP
Maintenance
Defector Problem
Conditions When Maintenance is Needed
Results Expected When
Component
Maintenance is Performed
Preventative
Plugging, obstructions
Any cause limiting flow into drywell.
Drywell able to receive full flow prior
to and during wet season.
Site
Trash and debris
I Trash or debris that could end up in the drywell is
No trash or debris that could get into
evident.
I the drywell can be found.
Pipes
Inlet is plugged
The entrance to the pipe is restricted due to
The entrance to the pipe is not
sediment, trash, or debris.
restricted.
Vegetation/roots
Vegetation/roots that reduce free movement of
Water flows freely through pipes,
water through pipes.
Plugged
Sediment or other material prevents free flow of
Water flows freely through pipes.
water through the pipe.
Broken or joint leaks.
Damage to the pipe or pipe joints allowing water
Pipe does not allow water to exit
j to seep out.
other than at the outlet.
Structure
Basin leaks
Holes or breaks in the basin allow water to leave
Basin is sealed and allows water to
the basin at locations other than per design.
exit only where designed.
Filter Media
Filter media plugged
Filter media plugged.
Flow through filter media is normal,
Inspection
i Frequency
Annually and prior to and following significant
Inspect drywell system for any
storms.
defects of deficiencies.
NO. 26 - GRAVEL FILLED INFILTRATION TRENCH BMP
Maintenance
Defect or Problem
Conditions When Maintenance is Needed
Results Expected When
Component
Maintenance is Performed
Preventative
Blocking, obstructions
Debris or trash limiting flow to infiltration trench.
Infiltration trench ablEto receive full
flow prior to and duriet season.
Site
Trash and debris
Trash or debris that could end up in the
No trash or debris thuld get intoinfiltration
trench is evident.
the infiltration trenchbe found
Pipes
Inlet is plugged
I The entrance to the pipe is restricted due to
The entrance to the pipe is not
sediment, trash, or debris.
restricted.
Vegetation/roots
Vegetation/roots that reduce free movement of
Water flows freely through pipes.
water through pipes.
i Plugged
Sediment or other material prevents free flow of
Water flows freely through pipes.
water through the pipe.
Broken or joint leaks.
Damage to the pipe or pipe joints allowing water
Pipe does not allow water to exit
to seep out.
other than at the outlet to the trench.
Structure
Flow not reaching
Flows are not getting into the trench as designed.
Water enters and exits trench as
trench
designed.
Cleanout/inspection
The cleanouttinspection access is not available.
Cleanout/inspection access is
access does not allow
available.
cleaning or inspection
I
I of trench
Filter Media
Filter media plugged
Filter media plugged.
Flow through filter media is normal.
Inspection
Frequency
Annually and prior to and following significant
Inspect infiltration trench system for
i
storms.
any defects of deficiencies,
2021 Surface Water Design Manual — Appendix A 7/23/2021
A-35
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -24 of 36
Record Date:1/8/2025 4:13 PM King County, WA
Patton Site Development
SITE ADDRESS: 11545 40th Avenue South, Tukwila, WA 98168
NW 1/4, Section 10, Township 23 N, Range 04 E, W.M.
40th Ave
Tukwila,, WA 98168
3ufy, 2023
Robert
Design Engineer
eviewed By, • t
Beyler Consulting LLC
5920 100th St. SWF #25
Lakewood, 98499 A} ••
253-984-2900
(253) 984-2900
info@beylerconsulting.com
beylerconsulting.com
5920 100" St. SW, #25
Lakewood, WA 98499
Plan..: Manacle.
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -25 of 36
Record Date:1/8/2025 4:13 PM King County, WA
_-u_, �. _�.........................................................1
Section 1 - Project Description......................................................1
Section 2- Responsible Parties......................................................1
Section 3 - Location Of Manual ......................................................
1
Section 4- Facilities Requiring Maintenance....................................1
Section 5 - Pollution Source Control Measures.................................2
Appendix
App -Facilities Details
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -26 of 36
Record Date:1/8/2025 4:13 PM King County, WA
This project proposes the construction of a single-family dwelling unit and associated
stormwater drainage facilities on a parcel with an existing concrete driveway. The project is
located at 11545 4016 Avenue South, Tukwila, WA 98168 on tax parcel #7340600182 and is
zoned low density residential (LDR).
• .•
The property owner is responsible for the maintenance and operation of private stormwater
facilities and associated conveyance systems constructed for this project.
Section 3 ® Location of Manual
For private facilities, a copy of the operation and maintenance manual shall be retained
onsite or within reasonable access to the site, be made available for review by City of
Tukwila staff and shall be transferred with the property to the new owner.
Section 4 - Facilities Requiring Maintenance
Stormwater Structures and BMPs Requiring Maintenance:
Pipe: A length of hollow cylinder that conveys stormwater from one point to another. They
come in various materials but are typically PVC, ductile iron, concrete, or other forms of
plastic.
Pipe Cleanout: A section of pipe that goes straight up to the surface and acts as an access
point for a pipe network. They are usually placed at bends or junctions.
Roof Downspout: A roof downspout is a stormwater runoff collection device used at low
points on roof structures to collect stormwater runoff as applicable.
Trench Drain: A trench drain is a trough style stormwater collection device used at low
points of impervious surfaces to collect stormwater runoff as applicable.
Infiltration Trench: A buried volume of gravel that receives stormwater collected from the
surface. Stormwater is stored in the gaps between the gravel while it seeps down out of the
trench and into the ground.
Catch Basin: A concrete box in the ground that joins 2 or more pipes in a network. They
may only have a single pipe going in or out in certain cases. Some catch basin lids are solid,
and others have grates that allow water to be collected.
Sediment Control Tee: A pipe and screen configuration placed in a catch basin or chamber
that prevents larger particles from continuing down a pipe network.
ISA
Instrument Number: 20250108000713 Docun/ont:COV Rocz$338.50 Pugo'27of36
Record Du1od/N/2#254d3 PM King County, WA
The intent of source control 8MPa is to prevent contamination from entering storrnvvater
runoff bycontrolling them at the source. They are a cost-effective means of reducing
pollutants in stormwater. Source control BMPs are classified as operational or structural.
Operational source control BMPsare considered to be the most cost-effective pollutant
minimization practices. Operational source control 8MPs are nonstructural practices that
prevent orreduce pollutants from entering stonnwater. They can also include process
changes such as raw material/product changes and recycling wastes.
Structural source control BMPs are physical, structural or mechanical devices or facilities
intended to prevent pollutants from entering stonnvvater. Structural 8MPstypioaUy cost
more to construct, operate, and maintain.
The BMPs discussed in this section are practical ways to keep stonnwaterfrurn becoming
polluted in the first place. Itis recommended that all residents in the City ofTukwila use
these 8MPs. Some of these procedures are required by various state, or county laws, and
are noted as required BMPe.
Rfflu�llffl _Mm
Most residents wash their cars in the driveway or on the street. VVashvvaters typically flow to
n storm drain or ditch, which discharges stonnvvaherdirectly tothe nearest river, stream,
lake, or Puget Sound. Soaps and detergents, even the biodegradable ones, can have
immediate and long-term effects on critters living |nwater bodies. The grime washed off the
car also contains a variety of pollutants that can harm fish and wildlife.
5uggestodBMPs:
° Away From Home (Preferred Option)
o Consider not washing your car et home. Take it to a cornnnenja| car wash that has a
recycle system and discharges wastewater to the sanitary sewer for treatment.
°
At Home
o Wash your car directly over your !awn or make sure the washwater drains to a
vegetated area. This allows the water and soap tnsoak into the ground instead of
running off into a local water body.
o Ideally, no soaps or detergents should be used, but if you do use one, select one
without phosphates.
o Commercial products are available that allow you to clean a vehicle without water.
These were developed for areas where water is scarce, so a water saving benefit is
realized, aswell as reduced pollution.
o Use e hose nozzle with o shut-off valve to save water.
o Du not wash your car if rain is expected. Rain events will rapidly wash and chemicals
and cleaning products from your property into the stornnwatersystenn (and to
downstream waters).
o Pour the bucket of soapy, dirty washwater down your sink. This way the water
doesn't pollute surface water. Instead, it's treated at the wastewater treatment
plant.
�
�
��
BEYLER
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -28 of 36
Record Date:1/8/2025 4:13 I'M Mug County, WA
hutgm.Q�bile M �intenan
Many of us are "weekend mechanics". We enjoy the cost savings of changing our own oil
and antifreeze, topping off the battery with water, and generally making our car perform its'
best. There is a lot of potential for stormwater pollution associated with these activities;
however, the following BMPs will help you minimize pollution while servicing your car.
Required BMPs:
Recycle all oils, antifreeze, solvents, and batteries. Many local car parts dealers and gas
stations accept used oil. The Household Hazardous Waste facilities at the Tacoma Landfill
or LRI Landfill accept oil, oil filters, antifreeze, and solvents. King County and Tacoma
also hold Household Hazardous Waste turn -in days that will accept car wastes including
old batteries. Old batteries can actually be worth money. Search for local battery
recycling businesses to find out if any offer to buy used batteries. Use the numbers
listed in Chapter 7 for more information,
Never dump new or used automotive fluids or solvents on the ground, in a storm drain
or street gutter, or in a water body. Eventually, it will make its way to local surface
waters or groundwater, including the water we drink.
Do not mix wastes. The chlorinated solvents in some carburetor cleaners can
contaminate a huge tank of used oil, rendering it unsuitable for recycling. Always keep
your wastes in separate containers which are properly labeled and store them out of the
weather.
Suggesting BMPs:
• Fix all leaks, to keep the leaky material off streets and out of surface water.
• To dispose of oil filters, punch a hole in the top and let drain for 24 hours. This is where
a large funnel in the top of your oil storage container will come in handy. After draining,
wrap in 2 layers of plastic and dispose of in your regular garbage or recycle by taking it
to the Tacoma Landfill or LRI Landfill Household Hazardous Waste facility for Tacoma
residents and non-residents. Call the Hazardous Waste line for up-to-date information on
the appropriate disposal of consumer products.
Use care in draining and collecting antifreeze to prevent accidental spills. Spilled
antifreeze can be deadly to cats and dogs that ingest
Perform your service activities on concrete or asphalt or over a plastic tarpaulin to make
spill cleanup easier. Keep a bag of kitty litter on hand to absorb spills. If there is a spill,
sprinkle a good layer on the spill, let it absorb for a little while and then sweep it up.
Place the contaminated litter in a plastic bag, tie it up, and dispose of it in your regular
garbage. Take care not to leave kitty litter out in the rain; it will form a sticky goo that is
hard to clean up.
If you are doing body work outside, be sure to use a tarpaulin to catch material resulting
from grinding, sanding, and painting. Dispose of this waste by double bagging in plastic
and placing in your garbage.
W1 11111 Amm
Improper storage of recycling, yard waste, and trash at residences can lead not only to
water pollution problems, but problems with neighborhood pets and vermin as well.
Following the BMPs listed below can help keep your property a clean and healthy place to
live.
min
Instrument Number: 20250108000713 Docun/ont:COV Rocz$338.50 Pugo'29of36
Record Du1od/N/2#254d3 PM Mug County, WA
5uggestedBMPs:
All recycling and waste containers kept outside should have lids. If your lid in damaged, you
should repair or replace it as soon as possible. If your container is supplied by your hauler,
please call to have the lid repaired or replaced.
° Leaking containers should be replaced. If your container /s supplied by your hauler,
contact the hauler tohave damaged containers replaced,
° Store containers undercover if possible, or on grassy areas.
• Inspect the storage area regularly to pick up loose scraps of material and dispose of
them properly.
° Tips for reducing waste:
o Recycle as much as you can. Most King County residents have access tocurbside
pickup for yard waste and recyclable materials.
o Purchase products which have the least amount of packaging materials.
o Compost biodegradable materials such as grass clippings and vegetable scraps
instead of throwing them away. Your flowerbeds will love the finished compost, and
you'll behelping tnconserve limited landfill space.
o Afun alternative to traditional composting is worm composting. You can let worms
do all the work for you by keeping a snna|/ vernnicu|ture box just outside your
kitchen.
Composting is an earth -friendly activity as long as some common-sense rules outlined
below are followed. If you choose to compost, the following BMPs should be utilized.
SuggeatedBMPs:
• Compost piles must be located on an unpaved area where runoff can soak into the
ground urbefiltered by grass and other vegetation. Compost piles should be located in
an area ofyour yard not prone to water ponding during storms, and should be kept well
away from wetlands, streams, lakes, and other drainage paths.
• Compost piles must be maintained and turned over regularly towork properly. Large
piles of unattended compost may create odor and vermin problems.
° Avoid putting hazardous, inorganic, plastics or metal waste in the pile.
�
Cover the compost pile for two reasons:
o To keep sturnnwaterfronn washing nutrients into waterways.
o To keep excess water from cooling down the pile, which will slow down the rate of
decomposition.
Build Bins of wood, chicken wire, or fencing material to contain compost so it can't be
washed away.
°
Building a small earthen dike around your compost pile is an effective means of
This section deals with the normal yard maintenance activities we all perform at our homes.
Overwatering, overfertilizing, improper herbicide application, and improper disposal of
trimmings and clippings can all contribute to serious water pollution problems. Following the
BMPs listed below will help alleviate pollutant runoff.
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -30 of 36
Record Date:1/8/2025 4:13 PM Mug County, WA
Instrument Number: 20250108000713 Docun/ont:COV Rocz$338.50 Pugo'31of36
Record Du1od/N/2#254d3 PM Mug County, WA
Contact your local waste disposal company for curbside pickup and recycling of yard
rely M_ "22,227mma all
Once we really start looking around our houses, the amount ufhazardous materials we have
onsite is a real eye-opener. 0| -based paints and stains, paint thinner, gasoline, charcoal
starter fluid, cleaners, waxes, pesticides, fingernail polish remover, and wood preservatives
are just afew hazardous materials that most ofuahave around the house.
When products such asthese are dumped on the ground or in a storm drain, they can be
washed directly to receiving waters where they can honn fish and w||d||ha. They can also
infiltrate into the ground and contaminate drinking water supplies. The same problem can
occur if they are disposed of with your regular garbage; the containers can leak at the
landfill and contaminate groundwater. The same type of contamination can also occur if
hazardous products are poured down a sink or toilet into a septic system. Don't pour them
down the drain if you're on municipal sewers, either. Many compounds can "pass through"
the wastewater treatment plant without treatment and contaminate receiving waters, or
they can harm the biological process used atthe treatment plant, reducing overall
treatment efficiency.
With such a diversity of hazardous products present in all homes in King County, n large
potential for serious environmental harm exists if improper methods of storage, usage, and
disposal are employed. Using the following BMPs will help keep these materials out of our
soils, sediments, and waters.
RequiredBMPs:
° Hazardous Materials must beused in accordance with the manufacturer recommendation
orguidelines aashown onthe label.
" Always store hazardous materials in properly labeled containers, never |nfood or
beverage containers which could be misinterpreted by child as something toeat or
drink.
° Dispose of hazardous materials and their containers properly. Never dump products
labeled as poisonous, corrosive, caustic, flammable, inflammable, volatile, explosive
danger, warn/ng, caution, or dangerous outdoors, in o storm drain, or into sinks, toilets
or drains. Call the Hazardous VVaahe Line, King County Health Department, or the King
County Solid Waste Utility Household Hazardous Waste for information on disposal
methods, collection events, and alternative products. Household hazardous wastes from
King County residents and non-residents are accepted atthe Landfill.
5uggestedBMPs:
° Check hazardous material containers frequently for signs of leakage. If container is
rusty and has the potential of leaking soon, place it in a secondary container before the
leak occurs and prevent cleanup problem.
~ Hazardous materials should be stoned out of the reach of children.
° Store hazardous materials containers under cover and off the ground. Keep them out of
the weather tuavoid rusting, freezing, cracking, labels being washed uhf, etc.
° Keep appropriate spill cleanup materials on hand. Kitty litter bgood for many oil-based
spills.
° Ground cloths and drip pans must be used under any work outdoors which involves
hazardous materials such as oil-based paints, stains, rust removers, masonry cleaners,
and others bearing label warnings aooutlined above.
Instrument Number: 20250108000713 Docun/ont:COV Rocz$338.50 Pugo'32of36
Record Du1od/N/2#254d3 I'M King County, WA
° Latex paints are nota hazardous waste, but one not accepted in liquid fnmn at the
landfill. Todispose of, leave uncovered in a protected place until dry, than place |nthe
garbaga If you wish to dry waste paint quickly, mix kitty litter or sawdust in the can to
absorb the paint. Once paint is dry, leave the lid off when you place it in the garbage so
your garbage collector can see that itisnolonger liquid.
° Use less toxic products whenever possible. The Hazardous Waste Line and the
Washington Toxics Coalition have information detailing alternatives totoxic products.
° If an activity involving the use of a hazardous material can be moved indoors out of the
weather, then do so. Make sure you can provide proper ventilation, however.
• Follow manufacturers' directions in the use of all materials. Overapplication of yard
chemicals, for instance, can result inthe washing ofthese compounds into receiving
water bodies. Never apply pesticides when rain is expected.
° When hazardous materials are /n use, place the container inside a tub or bucket to
minimize spills and store materials above the local base flood elevation (BFE).
Let Waste yllApp ent
Pet waste that washes into rivers, lakes, streams or Puget Sound begins to decay, using up
oxygen and releasing ennrnmnia. Low oxygen levels and ammonia combined with vvann
water can kill fish. Pet waste also contains nutrients that encourage weed and algae growth
in waters we use for swimming, boating and fishing. Most importantly, pet waste can carry
diseases and bacteria that could make water unsafe for contact and lead to beach closures
oreffect shellfish harvest. These include:
• Campylobacteriosis—bacterial infection
° Salmonellosis—bacterial infection
° Toxocariasis—roundworm infection
° Toxoplasmosis—protozoan parasite infection
° Giardiasis—protozoan parasite infection
" Fecal Col ih»rnn—bacteria in feces, indicates contamination
• E. co/i--bacteria in feces, may cause disease.
Cleaning up after your pet can be as simple as taking a plastic bag or pooper scooper along
on your next walk. Then choose one of the following:
Suggested8MPs:
° Bag it- Put waste in o securely dosed bag and deposit it/n the trash. Cm not put itin
your yard waste container because pet waste may carry diseases, and yard waste
treatment may not kill disease organisms.
• Bury it - Bury waste at least 1 foot deep and cover with soil in your yard or garden (not
)nfood-growing areas).
0 Flush it - Only Mush pet wastes if your home is served by a sanitary sewer which goes to
a sewage treatment plant. Water from your toilet goes through a treatment process that
removes pollutants before itisdischarged into the environment. Tuprevent plumbing
problems, don't flush debris or cat litter. Cat feces may he flushed, but used litter should
be put in a securely closed bag in the trash. Septic systems are not designed to
accommodate the high pollutant load o[pet waste. To prevent premature failure or
excessive maintenance costs do not flush pet wastes to your septic system.
^
Compost it - waste from srna|| animals other than dogs and cats (rabbits, rodents, etc.),
can be put in your compost bin.
mum
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -33 of 36
Record Date:1/8/2025 4:13 PM King County, WA
-1— Appendices.
Appendix _ — Stormwater Facilities Drawing
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -34 of 36
Record Date:1/8/2025 4:13 PM King County, WA
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Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -35 of 36
Record Date:1/8/2025 4:13 PM King County, WA
Instrument Number: 20250108000713 Document:COV Rec: $338.50 Page -36 of 36
Record Date:1/8/2025 4:13 PM King County, WA
�►9-17
WMATFARM,
" rigid or 6" flexible
perforifted pipe
-- — — — — — — — -- — — z
I
B i
�•--®®-- ---®—__—� � sumpw/solid lid
infiltration trench
roof drain
overflow
Profile View 4" rigid or 6" flexible splash block
perforated pipe CB sump
i A vv/solid lid
— — — — --- (
12 r washed 1 YZ � 3/4" 1' min �
1 min
,tL fine mesh screen
varies I
10' min. 5' min.
Section A -A
----- u-�-- �'` I filter fabric � compacted backfill
f 6" F
roof
drain
24" -- _ 4" rigid or 6" flexible
perforated pipe
12"
washed rock 1 Y2" - 3/4"
®*® 24 NOT TO SCALE
Typical
Revised June 2016
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2019 Stormwater Management Manual for Western Washington
Volume V - Chapter 4 - Page 709