HomeMy WebLinkAboutL_ WestonHeights_CCR SW PondInstrument Number: 20171020000833 Document:COV Rec: $105.00 Page -1 of 32
Record Date:10/20/2017 12:02 PM
King County, WA
Return Address:
City Clerk's Office
City of Renton
1055 S Grady Way
Renton, WA 98057
DECLARATION OF COVENANT FOR INSPECTION AND
MAINTENANCE OF STORMWATER FACILITIES AND BMPS
Grantor: Weston Heights LLC
Grantee: City of Renton
Legal Description: See Exhibit'C'
Assessor's Tax Parcel ID#: 1123059092, 1123059010
IN CONSIDERATION of the approved City of Renton Construction permit
for application file No. LUA/SWP U15-006162 relating to the real property ("Property")
described above, the Grantor(s), the owner(s) in fee of that Property, hereby covenants(covenant) with the
City of Renton, a political subdivision of the state of Washington, that he/she(they) will observe, consent
to, and abide by the conditions and obligations set forth and described in Paragraphs 1 through 10 below
with regard to the Property, and hereby grants(grant) an easement as described in Paragraphs 2 and 3.
Grantor(s) hereby grants(grant), covenants(covenant), and agrees(agree) as follows:
1. The Grantor(s) or his/her(their) successors in interest and assigns ("Owners of the described
property") shall at their own cost, operate, maintain, and keep in good repair, the Property's stormwater
facilities and/or best management practices ("BMPs") constructed as required in the approved
construction plans and specifications R-3895 on file with the City of Renton and submitted to the
City of Renton for the review and approval of permit(s) U15-006162 . The
property's stormwater facilities and/or best management practices ("BMPs") are shown and/or listed on
Exhibit A. The property's stormwater facilities and/or BMPs shall be maintained in compliance with the
operation and maintenance schedule included and attached herein as Exhibit B. Stormwater facilities
include pipes, swales, tanks, vaults, ponds, and other engineered structures designed to manage and/or
treat stormwater on the Property. Stormwater BMPs include dispersion and infiltration devices, native
vegetated areas, permeable pavements, vegetated roofs, rainwater harvesting systems, reduced impervious
surface coverage, and other measures designed to reduce the amount of stormwater runoff on the
Property.
2. City of Renton shall have the right to ingress and egress over those portions of the Property
necessary to perform inspections of the stormwater facilities and BMPs and conduct maintenance
activities specified in this Declaration of Covenant and in accordance with RMC 4-6-030.
3. If City of Renton determines that maintenance or repair work is required to be done to any of
the stormwater facilities or BMPs, City of Renton shall give notice of the specific maintenance and/or
repair work required pursuant to RMC 4-6-030. The City shall also set a reasonable time in which such
Page 1 of 3 Form Approved by City Attomey 10/2013
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -2 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
work is to be completed by the Owners. If the above required maintenance or repair is not completed
within the time set by the City, the City may perform the required maintenance or repair, and hereby is
given access to the Property, subject to the exclusion in Paragraph 2 above, for such purposes. Written
notice will be sent to the Owners stating the City's intention to perform such work. This work will not
commence until at least seven (7) days after such notice is mailed. If, within the sole discretion of the
City, 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.
4. If at any time the City of Renton reasonably determines that a stormwater facility or BMP on
the Property creates any of the hazardous conditions listed in RMC 4-4-060 G or relevant municipal
successor's codes as applicable and herein incorporated by reference, the City may take measures
specified therein.
5. The Owners shall assume all responsibility for the cost of any maintenance or repair work
completed by the City as described in Paragraph 3 or any measures taken by the City to address hazardous
conditions as described in Paragraph 4. 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. If legal action ensues, the
prevailing party is entitled to recover reasonable litigation costs and attorney's fees.
6. The Owners are hereby required to obtain written approval from City of Renton prior to
filling, piping, cutting, or removing vegetation (except in routine landscape maintenance) in open
vegetated stormwater facilities (such as swales, channels, ditches, ponds, etc.), or performing any
alterations or modifications to the st6rnnwater facilities and BMPs referenced in this Declaration of
Covenant.
7. Any notice or consent required to be given or otherwise provided for by the provisions of this
Agreement shall be effective upon personal delivery, or three (3) days after inailing by Certified Mail,
return receipt requested.
8. With regard to the matters addressed herein, this agreement constitutes the entire agreement
between the parties, and supersedes all prior discussions, negotiations, and all agreements whatsoever
whether oral or written.
9. This Declaration of Covenant is intended to protect the value and desirability of the real
property described above, and shall inure to the benefit of all the citizens of the City of Renton and its
successors and assigns. This Declaration of Covenant shall run with the land and be binding upon
Grantor(s), and Grantor's(s') successors in interest, and assigns.
10. This Declaration of Covenant may be tenninated by execution of a written agreement by the
Owners and the City that is recorded by King County in its real property records.
IN WITNESS WHEREOF, this Declaration �f Covenant for the Inspection and Maintenance of
Storinwater Facilities and BMPs is executed this /D day of S-� , 2YO
1111�
R, owner6f the Property
U xllq E. kawi H�r, cFo
GRANTOR, owner of the Property
Page 2 of 3 Form Approved by City Attorney 10/2013
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -3 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
STATE OF WASHINGTON )
COUNTY OF KING )ss.
On this day personally appeared before me:
i'fi , to me known to be the individual(s) described in
and who executedAe within and foregoing instrument and acknowledged that they signed the same as
their free and voluntary act and deed, for the uses and purposes therein stated.
Given under my hand and official seal this /0 day of , 20
Notary Public printed na
State of Washington
TANYA M BUSHAW Notary Public in and for the State of Washington,
My Appointment Expires Aug 16, 2019 residing at
W4
My appointment expires e // eon/ 9
Page 3 of 3 Form Approved by City Attorney 10/2013
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -4 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
15f0. -'-_� NE�TH,-PL . • • ��'� • , . .�•— ;--yam+' _
57+60
STA 30+31.75
(8.32 RT)
i CB #14
STA 36131.83
MATCHUNE SEE PAGE NO. 1B
E NOTE 3
I
1 STA 32+42.06
(8.25 RT)
CB #13
STA 3^� 1 44..9
WESTON HEIGHTS
EXHIBIT A PRIVATE STORMWATER
FACILITIES MAP
Scale
1A OF 3
Page No.
N
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O
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N
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L-
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(1)
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(8.32 RT)
i CB #14
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MATCHUNE SEE PAGE NO. 1B
E NOTE 3
I
1 STA 32+42.06
(8.25 RT)
CB #13
STA 3^� 1 44..9
WESTON HEIGHTS
EXHIBIT A PRIVATE STORMWATER
FACILITIES MAP
Scale
1A OF 3
Page No.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -5 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
MATCH LINE SEE PAGE NO. 1A
N 12" SD ip
1 69-.7 LF I
1 �" DI. I
Q 11
STR Pte/ D \�
EL 526.0 I� 1
I
3 RIP-RALEL
12" SD
OUTLET 2OOAD
ETN
182628.97#2E
1317199.60
50 LIF
IE=51 B.54JL
(5.17 RT)
DISPERSION
TRENCH.
(AS -BUILT)
1
=
CB #9
SEE DRAINAG
TRACT STA 3
STD PLAN
STA 34+94.56
C DETAIL SHEET
C4.3
224.00
(153.89 RT)
0
PRIVATE
STORMWATER �1
�1 TRACT 'C' _
CB #12
STA 33 !
z,12.G8
STAE� 33+11.79
(8.33 RT)
-12" DI 78.3 LF
S=1.33%
'ERK FILTER /
'TR #13 T
'TA 4.6
ST 90.27
(8.50 RT)
INLET #2
N 182564.80
E 1317244.07
IE=518.48
12" SD
7 2fi5-tF-
12" SD
5=0.707.
STA 34+71.79
(5.12 RT)
CB #10
STA 341-:2.86
(5 00_RTT—
SD
.3 LF 12" SD S=0.73%
12" SD
1
STA 34+99.12
50 LIF
(5.17 RT)
DISPERSION
TRENCH.
(AS -BUILT)
CB #1 OA '!�t
SEE COR
CB #9
SEE DRAINAG
TRACT STA 3
STD PLAN
STA 34+94.56
C DETAIL SHEET
C4.3
224.00
(153.89 RT)
SHEET C4.4
I
-
WESTON HEIGHTS
TWO'
EXHIBIT A
Scale
PRIVATE STORMWATER
113 OF 3
FACILITIES MAP
page No.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -6 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
EXHIBIT A (CONT)
MANHOLE FRAME AND
LOCKING COVER
LID ELEV. 524.33
=R ELEV. 62R -.G9522.06 "' L "a•
i
�'9 521.758" MIN. .SHEAR GATE W
CONTROL ROD FOR
ICTOR ELEV. �9 521.14 CLEANOUT/ DRAIN (BEND
= 5 8 to ROD AS REQ. FOR
lCTOR ELEV. 52~0.6& - — VERTICAL ALIGNMENT
t–t/a' ��n az W/COVER)
12" INLET (NW)
12" OUTLET (W) ELEV. 518.50 1 o ELEV. 518.50
12" CMP RISER STANDPIPE Z
N
PRIMARY ORIFICE ELEV.-i-6r59 516.51
z
RESTRICTOR PLATE WITH ROUND S o CATCH BASIN STEP
CLEAN 7/8' DIA., SHARP EDGED N a . (SEE DETAIL)
ORIFICE .SHOP—DRILLED IN 12 GA.
PLATE, WELDED TO RISER
NOTE
REFER TO SHEET C4.4 FOR
CONTROL STRUCTURE DETAILS, PER
COR STD PLN 237.00.
CB #10 — CONTROL STRUCTURE
TYPE 2-W CATCH BASIN
SCALE: 1'-2'
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -7 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
EXHIBIT A (CONT)
7.50' [90.00']
6.58' [79.00"]
24.00"X24.00" TRAFFIC RATED
GRATED INLET.
INLET,"OPENING
412.00.00"" DIP, IE: 521.7575 '.
I IIID ooEI
i � o
o J
- O--
INLET/BYPASS ASSEMBLY SK -0574.
OUTLET, 418.00 OPENING FOR
412.00" HDPE, IE: 519.43'.
I
15' r
30.00"
TOP VIEW
OF
PERK FILTER VAULT - 4' X 6.5'
18" CARTRIAGES, 3 EACH
-3X Perk Filter'" 4.08'
18.00" CARTRIDGES. [49.00'
A 5.00'
[60.00'
VENTED HOOD
SK -0871. ,
1
TOP SLAB NOT SHOWN FOR CLARITY.
ACCESS COVER AND GRATE
INLET SHOWN IN PHANTOM.
PAGE 1 OF 3
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -8 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
024.00" TRAFFIC RATED GRATED INLET.
FIELD POURED CONCRETE COLLAR REQUIRED,
BY OTHERS.
RIM: 524.26'
EXHIBIT A (CONT)
036.00" BOLTED & GASKEfED ACCESS COVER.
FIELD POURED CONCRETE COLLAR REQUIRED,
BY OTHERS.
2.51'
[30.12"] �-- -
IE: 521.75' _ -
INLET, 016.00" OPENING '
FOR 012.00" DIP. I I
I I,—T,`
L
e'
INLET/BYPASS ASSEMBLY SK -0574 --�
CONCRETE FALSE FLOOR.
SECTION:A-A
.50' [5.96'1
ADJUST TO GRADE
t— RIM: 524.26'
t 8.00"
-- 3X Perk Filter''
18.00" CARTRIDGES.
4.83'
-VENTED HOOD 44.00"-08
4.00" [57.96"]
SK -0871.
. i r
" EL: 519:43'
6.00"
OUTLET,
018.00" OPENING FOR 012.00" HDPE,. NEAR SIDE.
SIDE VIEW
OF
PERK FILTER VAULT — 4' X 6.5'
18" CARTRIAGES, 3 EACH
PAGE 2 OF 3
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -9 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
EXHIBIT A (CONT)
WADOE GOLD
CB # 11
Perk Filter TM Vault - 4'x 6.5'
18" Cartridges, 3 Each
Treatment Flow Rate
30.6 gpm / 0.068 cfs
Total Flow Capacity 4.3 cfs
NOTES:
1. CONCRETE COMPONENTS ARE DESIGNED
FOR HS -20 TRUCK LIVE LOAD AND
MANUFACTURED IN ACCORDANCE WITH
ASTM C890 & C913.
2. DESIGN FILL RANGE 1' MAXIMUM.
3. GROUND WATER TABLE FOR STRUCTURAL
CALCULATIONS IS ASSUMED AT TOP OF
VAULT.
4. DESIGN CONCRETE COMPRESSIVE STRENGTI
IS 5,000 PSI (MIN.) AT 28 DAYS.
5. PRECAST DESIGN DOES NOT INCLUDE ANY
LATERAL OR SURCHARGE LOADS FROM
OTHER BUILDINGS OR FOUNDATIONS
ADJACENT TO THIS STRUCTURE. THIS
STRUCTURE SHALL BE KEPT A MINIMUM
OF 1:1 RATIO AWAY FROM OTHER
FOOTINGS OR FOUNDATIONS,
6. THIS STRUCTURE IS DESIGNED TO THE
PARAMETERS NOTED HEREIN. PLEASE
VERIFY THAT THESE PARAMETERS MEET
PROJECT REQUIREMENTS (I.E. LIVE LOAD,
FILL RANGE, WATER TABLE). IF DESIGN
PARAMETERS ARE INCORRECT, REVIEWING
ENGINEER/AUTHORITY SHALL NOTIFY
OLDCASTLE PRECAST UPON REVIEW OF
THIS SUBMITTAL.
7. OVERSIZED. HOLES TO ACCOMMODATE
SPECIFIC PIPE TYPE MUST BE CONCENTRIC
TO PIPE ID. AFTER PIPES ARE INSTALLED,
ALL ANNULAR SPACES SHALL BE FILLED
WITH A MINIMUM OF 3000 PSI CONCRETE
FOR FULL THICKNESS OF PRECAST WALLS.
8, CONTRACTOR RESPONSIBLE TO VERIFY ALL
SIZES, LOCATIONS AND ELEVATIONS OF
OPENINGS.
9. CONTRACTOR RESPONSIBLE TO ENSURE
ADEQUATE BEARING SURFACE IS PROVIDED
(I.E. COMPACTED & LEVEL PER PROJECT
SPECIFICATIONS)
10. SECTION HEIGHTS, SLAB/WALL
THICKNESSES & KEYWAYS ARE SUBJECT
TO CHANGE DUE TO AVAILABILITY &
PRODUCTION PLANT CAPABILITY.
11. MAXIMUM PICK WEIGHT: BASE SECTION
11,500 LBS / 5.75 TONS. (ASSEMBLED
WITH CARTRIDGES INSTALLED).
DESIGN RATES AND NOTES
OF
PERK FILTER VAULT - 4' X 6.5'
18" CARTRIAGES, 3 EACH PAGE 3 OF 3
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -10 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
EXHIBIT B
OPERATIONS & MAINTENANCE
RECOMMENDATIONS
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -11 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
Operations and Maintenance Manual
DISPERSION TRENCH
Perforated pipes in dispersion trenches shall be kept open and clean. If the pipes appear
to be clogged, they should be cleaned by high pressure flushing with water or flexible
sewer rods. In cases where roots effectively block the drainage, the use of herbicides
may be indicated. Whatever method of cleaning is used, consideration for erosion and
sediment control is needed. The top of the dispersion trench should be kept free of
leaves, debris, soil, moss, and other sources; of clogging. If the surface or drain -rock
becomes clogged, it should be excavated and replaced.
The following pages are selections from Appendix A of the 2009 King County
Stormwater Design Manual applicable to this project:
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -12 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
NO.1 — DETENTION PONDS
Maintenance
Defect or Problem
Condition When Maintenance is Needed
Results Expected When
Component
Maintenance is Performed
Site
Trash and debris
Any trash and debris which exceed 1 cubic foot
Trash and debris cleared
per 1,000 square feet (this is about equal to the
from site.
amount of trash It would take to fill up one
standard size office garbage can). In general,
there should be no visual evidence of dumping.
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
r the public might normally be.
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and disposed
pollution
as oil, gasoline, concretes clurries or pain
of according to applicable
regulations. Source control BMPs
implemented if appropriate. No
contaminants present other than a
surface oil film.
Grass/groundc
Grass or groundcover exceeds 18 inches in
Grass or groundcover mowed to
over
height.
a height no greater than 6 Inches.
Top or.Side
Rodent
Any evidence of rodent holes -if facility is acting as
Rodents removed or destroyed an
Slopes of Dam,
holes
a dam or berm, or any evidence of water piping
dam or berm repaired.
Berm or
throw h dam or berm via rodent holies.
Embankment
Tree growth
Tree growth threatens integrity of slopes,
Trees do not hinder facility
does not allow maintenance access, or
performance or maintenance
interferes with maintenance activity. If trees
activities.
are not a threat or not interfering with access
or maintenance, they do not need to be
removed. .
Erosion
Eroded damage over 2 inches deep where
Slopes stabilized using
cause of damage is still present or where there
appropriate erosion control
Is potential for continued erosion. Any erosion
measures. If erosion if occurring
observed on a compacted slope.
on compacted slope, a Ilcensed
civil engineer should be
consulted to resolve source of
erosion.
Settlement
Any part of a dam, berm or embankment that
Top or side slope restored to
has settled 4 inches lower than the design
design dimensions. If settlement
elevation.
is significant, a licensed civil
engineer should be consulted to
determine the cause of the
settlement.
Storage Area
Sediment
Accumulated sediment that exceeds 10% of the
Sediment cleaned out to
accumulation
designed pond depth.
designed pond shape and depth;
pond reseeded if necessary to
control erosion.
Liner damaged (if
Liner is visible or pond does not hold water as
Liner repaired or replaced.
applicable)
designed.
Inlet/Outlet Pipe.
Sediment
Sediment filing 20% or more of the pipe.
Inlet/outlet pipes clear of
accumulation
sediment.
Trash debris
Trash and debris accumulation.in Inlet/outlet
No trash or debris in pipes.
pipes (includes floatables and non-floatables).
Damaged
Cracks wider than %-Inche at the join of the
No cracks more than 'Y Inches
Inlet/outlet pipes or any evidence of soil entering
wide at the joint of the Inlettoutlet
at the joints of the inlet/ouilet pipes.
pipe.
Emergency
Tree growth
Tree growth impedes flow or threatens stability
Trees removed.
Overflow/Spillway
of spillway.
Rock missing
Only one layer of rock exists above native soil in
Spillway restored to design
area five square feet or larger or any exposure
standards.
of native soil on the spillway.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -13 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
NO.4 — CONTROL STRUCTURE/FLOW RESTRICTOR
Maintenance
Defect or Problem
Condition When Maintenance Is Needed
Results Expected When
Component
Maintenance is Performed
Structure
Trash and debris
Trash or debris of more than '% cubic foot which is
No Trash or debris
located immediately in front of the catch basin
blocking or
opening or is blocking capacity of the catch basin
potentially blocking
by more than 10%.
entrance to structure
Trash or debris in the catch basin that exceeds
No trash or debris In the
1/sthe depth from the bottom of basin to invert the
catch basin.
lowest pipe into or out of the basin.
Deposits of.garbage exceeding 1 cubic fool in
No condition present
volume.
which would attract or
support the breeding of
Insects or rodents.
Sediment
Sediment exceeds 60% of the depth from the
Sump of structure contains
bottom of the structure to the invert of the
no sediment.
lowest pipe into or out of the structure or the
bottom of the FROP-T section or is within 6
inches of the invert of the lowest pipe into or out
of the structure or the bottom of the FROP-T
section.
Damage to frame
Corner of frame extends more than % Inch past
Frame Is even with curb.
andlor 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 wider than % inch.
cracks.
Frame not sitting flush on top slab, i.e.,
Frame is sitting flush on top
separation of more than 3% inch of the frame from
slab.
the top slab_
Cracks in walls or
Cracks wider than Y. inch and longerthan 3 feet,
Catch basin is
bottom
any evidence of soil particles entering catch
sealed and
basin through cracks, or maintenance person
structurally
judges that catch basin is unsound.
sound.
Cracks wider than % inch and longer than 1 fool
No cracks more than'! inc
at the joint of any inlet/outlet pipe or any evidence
of soil particles entering catch basin through
wide at 4
the joint of inlet/outlet pipe.
cracks.
Settlement/
Catch basin has settled more than 1 Inch or has
Basin replaced or repaired
misalignment
rotated more than 2 inches out of alignment.
to design standards.
Damaged pipe joints
Cracks wider than %ranch at the joint of the
No cracks more than'%-
inielloullet pipes or any evidence of soil entering
inch wide at the joint of
the catch basin at the joint of the inlelloutlet
inletloutlet pipes.
pipes_
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and
pollution
as oil, gasoline, concrete slurries or paint.
disposed of according to
applicable regulations.
Source control BMPs
implemented if
appropriate. No
contaminants present
other than a surface oil
film.
Ladder rungs
Ladder is unsafe due to missing rungs
Ladder meets design
missing or unsafe
misalignment, rust, cracks, or sharp edges
standards and allows
maintenance person safe
access.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -14 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
FROP T Section
Damage
T Section is not securely attached to structure wall
T section securely attached
and outlet pipe structure should support at least
to wall and outlet pipe.
1,000 lbs of up or down pressure.
Structure is not in upright position (allow up to 10%
Structure in correct position.
from plumb).
Connections to outlet pipe are not watertight or
Connections to outlet pipe
show signs of deteriorated grout.
are water tight; structure
repaired or replaced and
works as designed.
Any holes — other than designed holes — in the
Structure has no holes other
structure.
than designed holes.
Cleanout Gate
Damaged or
Cleanout gate is missing.
Replace cleanout gate.
missing
Cleanout gate is not watertight.
Gale is watertight and
works as designed.
Gate cannot be moved up and down by one
Gale moves up and down
maintenance person.
easily and is watertight.
Chainlrod leading to gate is missing or damaged.
Chain is in place and.works
as designed.
Orifice Plate
Damaged or
Control device Is not working properly due to
Plate is in place and works
missing
missing, out of place, or bent orifice plate.
as designed.
Obstructions
Any trash, debris, sediment, or vegetation blocking
Plate is free of all
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.
Deformed or
Lip of overflow pipe Is bend or deformed.
Overflow pipe does not
damaged lip
allow overflow at an
elevation lower than
designed.
Inlet/Outlet Pipe
Sediment
Sediment filling 20% or more of the pipe.
Inlettoutlet pipes clear of
accumulation
sediment.
Trash and debris
Trash and debris accumulated in inlet/outlet
No trash or debris in pipes.
pipes (includes floatables and non-floalables).
Damaged
Cracks wider than'/ -inch at the joint of the
No cracks more than '/,-
inlet/outlet pipes or any evidence of soil entering
inch wide at the joint of
at the joints of the inlet/outlet pipes.
the inleUouilet pipe.
Metal Grates (If
Unsafe grate opening
Grate with opening wider than 7/8 inch.
Grade opening meets
applicable)
design standards.
Trash and debris
Trash and debris that is blocking more than 20%
Grate free of trash and
of grate surface.
debris. Foolnot to
guidelines for disposal
Damaged or missing
Grate missing or broken member(s) of the grate.
Grate Is In place and
meets design standards.
Manhole Cover/Lid
Coverflid not in place
Cover/lid is missing or only partially in place.
Cover/lid protects opening
Any open structure requires urgent
to structure.
maintenance.
Locking mechanism not
Mechanism cannot be opened by one
Me3chanlsm opens with
working
maintenance person with proper tools. Bolls
proper tools.
cannot be seated. Self-locking cover/lid does not
Coverilid difficult to
One maintenance person cannot remove
Cover/lid can be removed
remove
cover/Ild after applying 80 lbs. of lift
and reinstalled by one
maintenance person.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -15 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
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
bottom of the catch basin to the invert of the
Sump of catch basin
contains no
lowest pipe into or out of the catch basin or
sediment.
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 fool which is
No Trash or debris
located immediately in front of the catch basin
blocking or
opening or is blocking capacity of the catch basin
potentially blocking
by more than 10%,
entrance to catch
basin.
Trash or debris in the catch basin that exceeds
No trash or debris in the
1/3 the depth from the bottom of basin to invert the
catch basin.
lowest pipe into or out of the basin.
Dead animals or vegetation that could generate
No dead animals or
odors that could cause complaints or dangerous
vegetation present
gases (e.g., methane).
within catch basin.
Deposits of garbage exceeding 1 cubic foot in
No condition present
volume.
which would attract or
support the breeding
of Insects or rodents,
Damage to frame,
Corner of frame extends more than 3/, inch past
Frame is even with curb.
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
cracks wider than ''% inch.
and cracks.
Frame not sitting flush on top slab, Le.,
Frame is silting flush on
separation of more than 3/. inch of the frame from
top slab.
the top slab.
Cracks in walls or
Cracks wider than 1/. inch and longer than 3 feet,
Catch basin is
bottom
any evidence of soil particles entering catch
sealed and
basin through cracks, or maintenance person
structurally
judges that catch basin is unsound.
sound.
Cracks wider than % inch and longer than 1 foot
at the joint of any inlet/outlet pipe or any evidence
of soil particles entering catch basin through
No cracks more than
inch wide at the joint of the
inlet/outlet.
cracks.
Settlement/
Catch basin has settled more than 1 inch or has
Basin replaced or
misalignment
rotated more than 2 inches out of alignment
repaired to design
Damaged pipe joints
Cracks wider than %-inch at the joint of the
No cracks more than Y,
Inlet/outlet pipes or any evidence of soil entering
inch wide at the joint of
the catch basin at the joint of the inlettoutlet
inlet/outlet pipes.
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and
pollution
as oil, gasoline, concrete slurries or paint.
disposed of according to
applicable regulations.
Source control BMPs
implemented if
appropriate. No
contaminants present
inlet/Outlet Pipe
Sediment
Sediment filling 20% or more of the pipe.
Inlet/outlet pipes clear of
accumulation
sediment.
Trash and debris
Trash and debris accumulated In inlet/outlet
No trash or debris In pipes.
pipes (Includes floatables and non-floatables).
Damaged
Cracks wider than %-Inch at the joint of the
No cracks more than'/,
inlet/outlet pipes or any evidence of soil entering
Inch wide at the joint of
at the joints of the inlet/outlet pipes.
the inlet/outlet pipe.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -16 of 32
Record Date: 10/20/2017 12:02 PNI King County, WA
NO.6 - CATCH BASINS AND MANHOLES
Maintenance
Defect or Problem
Condition When Maintenance is Needed
Results Expected When
Component
Maintenance is Performed
Metal Grates
Unsafe grate opening
Grate with opening wider than 718 inch.
Grate opening
(Catch Basins)
meets design
standards.
Trash and debris
Trash and debris that is blocking more than 20%
Grate free of trash and
of grate surface.
debris. footnote to .
guidelines for disposal
Damaged or missing
Grate missing or broken member(s) of the grate.
Grate is in place and
Any open structure requires urgent
meets design standards.
maintenance.
Manhole Cover/Lid
Cover/lid not in place
Cover/lid is missing or only partially in place.
Coverllid protects
Any open structure requires urgent
opening to structure.
maintenance.
Locking mechanism
Mechanism cannot be opened by one
Mechanism opens.with
Not Working
maintenance person with. proper tools. Botts
proper tools.
cannot be seated. Self-locking cover/lid does not
work.
CoverAid difficult to
One maintenance person cannot remove
Coverllid can be
Remove
cover/lid after applying 80 lbs. of lift.
removed and
reinstalled by one
maintenance person
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -17 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
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
accumulation
20% of the diameter of the pipe.
pipes.
Vegetation/roots
Vegetation/roots that reduce free movement of
Water flows freely through
water through pipes.
pipes.
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and
pollution
as oil, gasoline, concrete slurries or paint.
disposed of according to
applicable regulations.
Source control BMPs
Implemented if
appropriate. No .
contaminants present
other than a surface oil
film.
Damage to prolective
Protective coating Is damaged; rust or corrosion is
Pipe repaired or replaced.
coaling or corrosion
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
square feet of ditch and slopes.
cleared from
ditches.
Sediment
Accumulated sediment that exceeds 20% of the
Ditch cleaned/flushed of
accumulation
design depth.
all sediment and debris
so that it matches design.
Noxious weeds
Any noxious or nuisance vegetation which may
Noxious and nuisance
constitute a hazard to County personnel or the
vegetation removed
public.
according to applicable
regulations. No danger
of noxious vegetation
where County personnel
or public might
normally be.
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and
pollution
as oil, gasoline, concrete slurries or paint.
disposed of 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
through ditches.
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
place. or missing (If
area 5 square feet or more, any exposed native
standards.
Applicable)
soil.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -18 of 32
Record Date: 10/20/2017 12:02 PNI King County, WA
NO.8 — ENERGY DISSIPATERS
Maintenance
Defect or Problem
Conditions When Maintenance is Needed
Results Expected When
Component
Maintenance Is
Performed.
Site
Trash and debris
Trash andlor debris accumulation.
Dissipater clear of
trash and/or debris.
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and
pollution
as oil, gasoline, concrete slurries or paint.
disposed of according to
applicable regulations.
Source control BMPs
implemented if
appropriate. No
contaminants present
other than a surface oil
film.
Rock Pad
Missing or moved
Only one layer of rock exists above native soil in
Rock pad prevents
Rock
area five square feet or larger or any exposure of
erosion.
native soil.
Dispersion Trench
Pipe plugged with
Accumulated sediment that exceeds 20% of the
Pipe
sediment
design depth.,
cleaned/flushed so
that it matches
design.
Not discharging water
Visual evidence of water discharging at
Water discharges
properly
concentrated points.along trench (normal
from feature by sheet
condition is a "sheet flout' of water along trench).
flow.
Perforations plugged.
Over 1/4 of perforations in pipe are plugged with
Perforations freely
debris or sediment.
discharge flow.
Water flows out top of
Water flows out of distributor catch basin during
No flow discharges
"distributor" catch
any storm less than the design storm.
from distributor catch
basin.
basin.
Receiving area over-
Water irimceiving area is causing orhas
No danger of landslides.
saturated
potential of causing landslide problems.
Gabions
Damaged mesh
Mesh of gabion broken, twisted or deformed so
Mesh is intact, no rock
structure is weakened or rock may fall out.
missing.
Corrosion
Gabion mesh shows corrosion through more than
All gabion mesh
Y of Its gage.
capable of
containing rock
Collapsed: or
Gabion basket shape deformed due to any
All gabion baskets
deformed baskets
cause.
Intact, structure stands
as designed.
Missing rock
Any rock missing that could cause gabion to
No rock missing.
loose structural integrity.
Manhole/Chamber
Worn or damaged
Structure dissipating flow deteriorates to M. or
Structure is in no danger o
post; baffles or side of
original.s.ize or any concentrated worn spot
failing.
chamber
exceeding one square foot which would make
structure unsound.
Damage to wall,
Cracks wider than %-inch or any evidence of soil
Manhole/chamber Is
frame, bottom, andlor
entering the structure through cracks, or
seated and
top slab
maintenance inspection personnel determines
structurally sound.
that the structure is not structurally sound.
Damaged pipe joints
Cracks wider than Y. -Inch at the joint of the
Nosoil or water enters
inletioutlet pipes or any evidence of soil entering
and no water discharges
the structure at the.joint of the inlet/outiet pipes.
at the joint of inlet/outlet
pipes.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -19 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
NO.9 — FENCING
Maintenance
Defect or Problem
Condition When Maintenance is Needed
Results Expected When
Component
Maintenance Is
Performed
Site
Erosion or holes under
Erosion or holes more than 4 inches high and
No access under
fence
12-18 inches wide permitting access through an
the fence.
opening under a fence.
Wood pots, boards
Missing or damaged
Missing or broken boards, post out of plumb by
No gaps on fence
and cross members
parts
more than 6 inches or cross members broken
due to missing or
broken boards, post
plumb to within 1 h
inches, cross
members sound.
Weakened by rotting or
Any part showing structural deterioration due to
All parts of fence
insects
rotting or Insect damage
are structurally
sound.
Damaged or failed post
Concrete or metal attachments deteriorated or
Post foundation
foundation
unable to support posts.
capable of
supporting posts
even in strong wind.
Metal Posts, rails and
Damaged parts
Post out of plumb more than 6 Inches
Post plumb to within
fabric
1 Y. Inches.
Top rails bent more than 6 inches
Top rail free of
bends greater than
1 inch.
Any part of fence (including post, top rails and
Fence is aligned
fabric) more than 1 foot out of design alignment.
and meets design
standards.
Missing or loose tension Wire.
Tension wire to
place and holding
fabric.
Deteriorated paint or
Part or parts that have a rusting or scaling
Structurally
protective coating
condition that has affected structural adequacy.
adequate post or
parts with a uniform
protective coating.
Openings in fabric
Openings in fabric are such that an 8 -inch
Fabric mesh
diameter ball could fit through.
openings within
50% of grid size.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -20 of 32
Record Date: 10/20/2017 12:02 PNI King County, WA
NO. 10 — GATES/BOLLARDS/ACCESS BARRIERS
Maintenance
Defect or Problem
Condition When Maintenance is Needed
Results Expected When
Component
Maintenance is
Performed
Chain Link Fencing
Damaged or missing
Missing gate
Gates in place
Gate
members
Broken or missing hinges such that gate cannot
Hinges Intact and
be easily opened and closed by a maintenance
lubed. Gate is
person.
working freely.
Gate is out of plumb more than 6 inches and
Gate Is aligned and
more than 1 foot out of design alignment.
vertical.
Missing stretcher bar, stretcher bands and ties
Stretcher bar, bands
and ties in place.
Locking mechanism
Locking devise missing, no -functioning or does
Locking mechanism
does not lock gate
not link to all parts.
prevents opening of
ate.
Opening in fabric
Openings in fabric are such that an 8 -inch
Fabric mesh
diameter ball could fit through.
openings within
50% of grid size.
Bar Gate
Damaged or missing
Cross bar does not swing open or closed, is
Cross bar swings
cross bar
missing or is bent to where it does not prevent
fully open and
vehicle access.
closed and prevents
vehicle access.
Locking mechanism
Locking device missing, no -functioning or does
Locking mechanism
does not lock gate
not link to all parts,
prevents opening of
gate.
Support post damaged
Support post does not hold cross bar up.
Cross bar held up
preventing vehicle
access into facility.
Bollards
Damaged or missing
Bollard broken, missing, does not fit into support
No access for
hole or hinge broken or missing.
motorized vehicle
access into facility.
Does not lock
Locking assembly or lock missing or cannot be
No access for
attached to lock bollard in place.
motorized vehicle
access into facility.
Boulders
Dislodge
Boulders not located to prevent motorized
No access for
vehicle access.
motorized vehicle
access into facility.
Circumvented
Motorized vehicles going around or between
No access for
boulders.
motorized vehicle
access into facility.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -21 of 32
Record Date: 10/20/2017 12:02 PNI King County, WA
NO. 11—GROUNDS (LANDSCAPING)
Maintenance
Defect or Problem
Condition When Maintenance Is Needed
Results Expected When
Component
Maintenance is
Performed
Site
Trash or litter
Any and debris which exceed 1 cubic foot per
Trash and debris
1,000 square feel (this is about equal to the
cleared from site.
amount of trash it would take to fill up one
standard size office garbage can). In general,
there should be no visual evidence of dumping.
Noxious weeds
Any noxious or nuisance. vegetation which may
Noxious and
constitute a hazard to County personnel or the
nuisance vegetation
public,
removed according
to applicable
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
pollution.
as oil gasoline, concrete slurries or paint.
and disposed of
according to
applicable
regulations. Source
control BMPs
implemented if
appropriate. No
contaminants
present other than a
surface oil film.
Grasslgroundcover
Grass or groundcover exceeds 18 inches in
Grass or
height.
groundcover mowed
to a height no
greater than 6
inches.
Tree and shrubs
Hazard
Any tree or limb of a tree identified as having a
Trash and debris
potential to fall and cause property damage or
cleared from site.
threaten human fife. A hazard tree Identified
by a qualified arborist must be removed as
soon as possible.
Damaged
Limbs or parts of trees or shrubs that are split or
Trees and shrubs
broken which affect more than 25% of the total
with less than 5% of
foliage of the tree or shrub
total foliage with
split or broken
limbs.
Trees or shrubs that have been blown down or
No blown down
knocked over.
vegetation or
knocked over
vegetation. Trees or
shrubs free of injury.
Trees or shrubs which are not adequately
Tree or shrub in
supported or are leaning over, causing exposure
place and
of the roots.
adequately
supported; dead or
diseased trees
removed.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -22 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
NO. 12—ACCESS ROADS
Maintenance
Defect or Problem
Conditions When Maintenance is Needed
Results Expected When
Component
Maintenance is
Performed.
Site
Trash and debris
Trash andfor debris exceeds 1 cubic foot per 1,000
Roadway driveable
square feet (i. e., trash and debris would fill up one
by maintenance
standards size garbage can).
vehicles.
Debris which could damage vehicle tires or prohibit
Roadway driveable
use of road.
by maintenance
vehicles.
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and
pollution
as oil, gasoline, concrete slurries or paint.
disposed of according to
applicable regulations.
Source control BMPs
Implemented if
appropriate. No
contaminants present
other than a surface oil
film.
Block roadway
Any obstruction which. reduces clearance above
Roadway overhead clear
road surface to less than 14 feet.
to 14 feet high.
Any obstruction restricting the access to a 10-
At least 12 -foot of width
to 12 foot width for a distance of more than 12
on access road.
feet or any point restricting access to less than
a 10 foot width.
Road surface
Erosion, settlement,
Any surface defect which hinders or prevents
Road driveable by
potholes, soft spots,
maintenance access.
maintenance vehicles.
ruts
Vegetation on road
Trees or other vegetat'ion prevent access to
Maintenance vehicles can
surface
facility by maintenance vehicles.
access facility.
Shoulders and ditches
Erosion
Erosion within 1 foot of the roadway more than
Shoulder free of
8 inches wide and 6 inches deep.
erosion and
matching the
surrounding road.
Weeds and brush
Weeds and brush exceed 18 Inches In height or
Weeds and brush cut
hinder maintenance access.
to 2 Inches in.helght
or cleared In such a
way as to allow
maintenance access.
Modular grid
Contaminants and
Any evidence of contaminants or pollution such
Materials removed and
pavement
pollution
as oil, gasoline, concrete slurries or paint.
disposed of according to
applicable regulations.
Source control BMPs
implemented if
appropriate. No
contaminants present
other than a surface oil
film
Damaged or missing
Access surface compacted because of broken on
Access road
missing modular block
surface restored
so road Infiltrates.
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -23 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
Oldcastle
Stormwater Solutions
PERKFILTEI?"
INSPECTION AND MAINTENANCE GUIDE
November4, 2015
Version 1
800-579-8819 ( oldcastlestormwater.com
stormcapture.com
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -24 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
PerkFilter I Inspection and Maintenance Guide
PerkFilter TM Media Filtration System
Description
The PerkFilter is a stormwater treatment device used to remove pollutants from urban runoff.
Impervious surfaces and other urban and suburban landscapes generate a variety of
contaminants that can enter stormwater and pollute downstream receiving waters. The
PerkFilter is a media -filled cartridge filtration device designed to capture and retain sediment,
gross solids, metals, nutrients, hydrocarbons, and trash and debris. As with any stormwater
treatment system, the PerkFilter requires regular periodic maintenance to sustain optimum
system performance.
Function
The PerkFilter is a water quality treatment system consisting of three chambers: an inlet chamber, a filter
cartridge treatment chamber, and an outlet chamber (Figure 1). Stormwater runoff enters the inlet
chamber through an inlet pipe, curb opening, or grated inlet. Gross solids are settled out and floating
trash and debris are trapped in the inlet chamber. Pretreated flow is then directed to the treatment
chamber through an opening in the baffle wall between the inlet chamber and treatment chamber. The
treatment chamber contains media -filled filter cartridges (Figure 2) that use physical and chemical
processes to remove pollutants. During a storm event, runoff pools in the treatment chamber before
passing radially through the cylindrical cartridges from the outside surface, through the media for
treatment, and into the center of the cartridge. At the center of the cartridge is a center tube assembly
designed to distribute the hydraulic load evenly across the surface of the filter cartridge and control the
treatment flow rate. The center tube assembly discharges treated flow through the false floor and into the
outlet chamber. A draindown feature built into each cartridge allows the treatment chamber to dewater
between storm events.
Inlet
Inlet
Precast concrete vault
Filter cartridge treatment chamber
Ann r`,,srs
Concrete talse floor Outlet chamber
rethood
let pipe
Figure 1. Schematic of the PerkFilter system.
2015 Oldcastle Precast, Inc. 2 11/4/2015_V1
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -25 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
PerkFilter I Inspection and Maintenance Guide
All PerkFilter systems include a high flow bypass assembly to divert flow exceeding the treatment
capacity of the filter cartridges around the treatment chamber. The bypass assembly routes peak
flow from the inlet chamber directly to the outlet chamber, bypassing the treatment chamber to
prevent sediment and other captured pollutants from being scoured and re -entrained by high flow.
Treated flow and bypass flow merge in the outlet chamber for discharge by a single outlet pipe.
Outer media
Inner media
Outer scre
(with draindown)
Vent tube
Center tube assembly
Figure 2. Schematic of the PerkFilter cartridge.
Configuration
The PerkFilter structure may consist of a vault, manhole, or catch basin configuration. Catch
basin units may be fabricated from concrete or steel. Internal components including the
PerkFilter cartridges are manufactured from durable plastic and stainless steel components
and hardware. All cartridges are 18 inches in diameter and are available in two heights: 12 -
inch and 18 -inch. Cartridges may be used alone or may be stacked (Figure 3) to provide 24 -
inch and 30 -inch combinations. The capacity of each cartridge or cartridge combination is
dictated by the allowable operating rate of the media and the outer surface area of the
cartridge. Thus, taller cartridges have greater treatment capacity than shorter cartridges but
they also require more hydraulic drop across the system. Cartridges may be filled with a wide
variety of media but the standard mix is composed of zeolite, perlite, and carbon (ZPC).
Access to an installed PerkFilter system is typically provided by ductile iron castings or hatch covers.
The location and number of access appurtenances is dependent on the size and configuration of the
system.
2015.Oldcastle Precast, Inc. 3 11/4/2015 Vi
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -26 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
PerkFilter I Inspection and Maintenance Guide
Vent tube (4 " dia.)
Top stacked cartridge
Inner interconnector coupling (2 " dia.)
Outer interconnector coupling (4 "dia.;
Single orb ottom stacked cartridge
Urethane bottom cap
Slip coupler (2 "dia.)
Figure 3. Schematic of stacked cartridges and connector components.
2015 Oldcastle Precast, Inc. 4 11/4/2015_V1
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -27 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
PerkFilter l Inspection and Maintenance Guide
Maintenance Overview
State and local regulations require all stormwater management systems to be inspected on a regular
basis and maintained as necessary to ensure performance and protect downstream receiving waters.
Maintenance prevents excessive pollutant buildup that can limit system performance by reducing the
operating capacity and increasing the potential for scouring of pollutants during periods of high flow.
Inspection and Maintenance Frequency
The PerkFilter should be inspected on a regular basis, typically twice per year, and maintained
as required. Initially, inspections of a new system should be conducted more frequently to help
establish an appropriate site-specific inspection frequency. The maintenance frequency will be
driven by the amount of runoff and pollutant loading encountered by a given system. In most
cases, the optimum maintenance interval will be one to three years. Inspection and
maintenance activities should be performed only during dry weather periods.
Inspection Equipment
The following equipment is helpful when conducting PerkFilter inspections:
• Recording device (pen and paper form, voice recorder, Pad, etc.)
• Suitable clothing (appropriate footwear, gloves, hardhat, safety glasses, etc.)
• Traffic control equipment (cones, barricades, signage, flagging, etc.)
• Socket and wrench for bolt -down access covers
• Manhole hook or pry bar
• Flashlight
• Tape measure
• Measuring stick or sludge sampler
• Long -handled net (optional)
Inspection Procedures
PerkFilter inspections are visual and may be conducted from the ground surface without entering
the unit. To complete an inspection, safety measures including traffic control should be deployed
before the access covers are removed. Once the covers have been removed, the following items
should be checked and recorded (see form provided at the end of this document) to determine
whether maintenance is required:
• Inspect the internal components and note whether there are any broken or missing parts. In the
unlikely event that internal parts are broken or missing, contact Oldcastle Stormwater Solutions at
(800) 579-8819 to determine appropriate corrective action.
• Note whether the inlet pipe is blocked or obstructed. The outlet pipe is covered by a removable
outlet hood and cannot be observed without entering the unit.
2015 Oldcastle Precast, Inc. 6 11/4/2015_Vi
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Record Date: 10/20/2017 12:02 PM King County, WA
PerkFilter I Inspection and Maintenance Guide
Observe, quantify, and record the accumulation of floating trash and debris in the inlet chamber.
The significance of accumulated floating trash and debris is a matter of judgment. A long -handled
net maybe used to retrieve the bulk of trash and debris at the time of inspection if full maintenance
due to accumulation of floating oils or settled sediment is not yet warranted.
Observe, quantify, and record the accumulation of oils in the inlet chamber. The significance of
accumulated floating oils is a matter of judgment. However, if there is evidence of an oil or fuel spill,
immediate maintenance by appropriate certified personnel is warranted.
Observe, quantify, and record the average accumulation of sediment in the inlet chamber and
treatment chamber. A calibrated dipstick, tape measure, or sludge sampler may be used to
determine the amount of accumulated sediment in each chamber. The depth of sediment may be
determined by calculating the difference between the measurement from the rim of the PerkFilter to
the top of the accumulated sediment and the measurement from the rim of the PerkFilter to the
bottom of the PerkFilter structure. Finding the top of the accumulated sediment below standing
water takes some practice and a light touch, but increased resistance as the measuring device is
lowered toward the bottom of the unit indicates the top of the accumulated sediment.
Finally, observe, quantify, and record the amount of standing water in the treatment chamber
around the cartridges. If standing water is present, do not include the depth of sediment that may
have settled out below the standing water in the measurement.
Maintenance Triggers
Maintenance should be scheduled if any of the following conditions are identified during the
inspection:
• Internal components are broken or missing.
• Inlet piping is obstructed.
• The accumulation of floating trash and debris that cannot be retrieved with a net and/or oil
in the inlet chamber is significant.
• There is more than 6" of accumulated sediment in the inlet chamber.
• There is more than 4" of accumulated sediment in the treatment chamber.
• There is more than 4" of standing water in the treatment chamber more than 24 hours after
end of rain event.
• A hazardous material release (e.g. automotive fluids) is observed or reported.
• The system has not been maintained for 3 years (wet climates) to 5 years (dry climates).
Maintenance Equipment
The following equipment is helpful when conducting PerkFilter maintenance:
• Suitable clothing (appropriate footwear, gloves, hardhat, safety glasses, etc.)
• Traffic control equipment (cones, barricades, signage, flagging, etc.)
Socket and wrench for bolt -down access covers
• Manhole hook or pry bar
• Confined space entry equipment, if needed
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Record Date: 10/20/2017 12:02 PM King County, WA
PerkFilter I Inspection and Maintenance Guide
• Flashlight
• Tape measure
• 9116" socket and wrench to remove hold-down struts and filter cartridge tops
• Replacement filter cartridges
• Vacuum truck with water supply and water jet
:Contact Oldcastle Stormiwater Solutions at (800) 679-8819 for replacement filter cartridges. A
leadtime of four weeks is recommended.
Maintenance Procedures
Maintenance should be conducted during dry weather when no flow is entering the system. Confined
space entry is necessary to maintain vault and manhole PerkFilter configurations. Only personnel that
are OSHA Confined Space Entry trained and certified may enter underground structures. Confined
space entry is not required for catch basin PerkFilter configurations. Once safety measures such as
traffic control are deployed, the access covers may be removed and the following activities may be
conducted to complete maintenance:
Remove floating trash, debris, and oils from the water surface in the inlet chamber using the
extension nozzle on the end of the boom hose of the vacuum truck. Continue using the vacuum truck
to completely dewater the inlet chamber and evacuate all accumulated sediment from the inlet
chamber. Some jetting may be required to fully remove sediment. The inlet chamber does not need
to be refilled with water after maintenance is complete. The system will fill with water when the next
storm event occurs.
• Remove the hold-down strut from each row of filter cartridges and then remove the top of each
.cartridge (the top is held on by four 9116" bolts) and use the vacuum truck to evacuate the spent
media. When empty, the spent cartridges may be easily lifted off their slip couplers and removed
from the vault. The couplers may be left inserted into couplings cast into the false floor to prevent
sediment and debris from being washed into the outlet chamber during washdown.
Once all the spent cartridges have been removed from the structure, the vacuum truck may be used
to evacuate all accumulated sediment from the treatment chamber. Some jetting may be required to
fully remove sediment. Take care not to wash sediment and debris through the openings in the false
floorand into the outlet chamber. All material removed from the PerkFilter during maintenance
including the spent media must be disposed of in accordance with local, state, and/or federal
regulations. In most cases, the material may be handled in the same manner as disposal of material
removed from sumped catch basins or manholes.
• Place a fresh cartridge in each cartridge position using the.existing slip couplers and urethane
bottom caps. If the vault is equipped with stacked cartridges, the existing outer and inner
interconnector couplers must be used between the stacked cartridges to provide hydraulic
connection. Transfer the existing vent tubes from the spent cartridges to the fresh cartridges. Finally,
refit the struts to hold the fresh cartridges in place.
• Securely replace access covers, as appropriate.
• Make arrangements to return the empty spent cartridges to Oldcastle Stormwater Solutions.
2015 Oldcastle Precast, Inc. 7 11/4/2015 V1
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -30 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
PerkFilter
Inspection and Maintenance Log
Location t
_
RM
=Structure Configuration and Size' < 4 , }f tllnspecfioh Date h
Vault feet feet ti
x
�amete4 >4 s
4--3 ManholedrY
77 7 n F
4 {
Catch Basin 4 fleet'
'Nfeetx
Ft
iVumber anc Height of Cartridges.
rCount' S`each D 12" L7 18° CI 24'� C7`30" r
y
Me�i�a T,Ype* Y s
s
T+t 1
U SPC � Perllte � Other a
t i
Condition of Internal Components
Notes:
0: Good ❑ Damaged ❑ Missing
Inlet Pipe Blockage or Obstruction
Notes.
❑ Yes ❑ No
Floating: Trash and Debris
Notes:
❑ Significant ❑ Not Significant
Floating. Oils
Notes:
Q Significant: ❑ .Not Significant 0. Spill.
Sediment Depth in Inlet Chamber
Notes:
❑ inches of Sediment:
.Sediment Depth in Treatment Chamber
Notes:
❑.Inches of Sediment:.
Notes:
Standing Water in Treatment Chamber
❑ Inches of Standing Water:
Maintenance Regutred v `
t y h s • r_
❑ Ykes Schedule Mairttelnance ❑ No Inspect Again a� Months
L
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -31 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
EXHIBIT C
LEGAL DESCRIPTION
Instrument Number: 20171020000833 Document:COV Rec: $105.00 Page -32 of 32
Record Date: 10/20/2017 12:02 PM King County, WA
LEGAL DESCRIPTION
THAT PORTION OF THE NORTHWEST QUARTER OF THE SOUTHWEST QUARTER
OF SECTION 11, TOWNSHIP 23 NORTH, RANGE 5
EAST, WILLAMETTE MERIDIAN, IN KING COUNTY, WASHINGTON, DESCRIBED AS
FOLLOWS:
BEGINNING AT A POINT 15 FEET NORTH OF THE SOUTHWEST CORNER OF THE
NORTH HALF OF SAID NORTHWEST QUARTER OF
THE SOUTHWEST QUARTER OF SAID SECTION 11;
THENCE EAST TO A POINT 645 FEET WEST OF THE EAST LINE OF SAID
SUBDIVISION;
THENCE NORTH 157.5 FEET TO THE SOUTH LINE OF THAT TRACT DESCRIBED
UNDER RECORDING NO. 5481257;
THENCE WEST 675 FEET, MORE OR LESS, ALONG SAID SOUTH LINE, TO THE
WEST LINE OF SAID SUBDIVISION;
THENCE SOUTH ALONG SAID WEST LINE TO THE POINT OF BEGINNING;
EXCEPT THE WEST 30 FEET THEREOF, RESERVED FOR 148TH AVENUE
SOUTHEAST (NILE AVENUE NORTHEAST).
TOGETHER WITH TRACT L, WINDWOOD DIVISION 3, ACCORDING TO THE PLAT
THEREOF, RECORDED IN VOLUME 198 OF PLATS, PAGES 22
THROUGH 27, RECORDS OF KING COUNTY, WASHINGTON.
SUBJECT TO AN EASEMENT OVER TRACT L FOR TELEPHONE FACILITIES THE
LOCATION OF WHICH IS NOT DETERMINED AS RECORDED UNDER RECORDING
NUMBER 3575586.