HomeMy WebLinkAboutMISCWASHINGTON FORESTRY CONSULTANTS, INC.
FORESTRY AND VEGETATION MANAGEMENT SPECIALISTS
w F C I
360/943-1723
FAX 360/943-4128
1919 Yelm Hwy SE, Suite C
Olympia, WA 98501
January 25, 2017
Luke Randles, P.E.
liiiii\ill
1505 Westlake Ave N., Suite 305
Seattle, WA 98109
RE: Renton Firestone -Potential for Transplanting Existing Spruce Trees Onsite
Dear Mr. Randles:
JAN z ii
The Sitka spruces range from 10 to 26 inches DBH. This means their caliper at 12 inches above the
ground line are more like 16 to 35 or more inches diameter. These are too large to move with the size of
tree spades (90 inch spades) that exist in western Washington and Oregon. They would not survive.
For a tree this size. they would need to be dug and a box built around the root system. I expect that cost
to be in excess of $26,000 per tree.
Spruce is a shallow rooted tree species, and given the marginal health of these trees, their large size,
and the gravelly texture of the soil -I would suggest the likelihood of survival of one of these spruces to
be 1poor to zero', even with good follow-up care.
T owned 1/2 of a big tree moving company from 2002 to 2016 (Tree \!!overs Northwest, Inc.), so I have a
great deal of experience moving large trees. I would never move a spruce larger than 6 inches DBH, and
then it would need to be a specimen quality tree, and, have serious and dedicated atiercare for at least 2
years.
My suggestion is to plant new trees of a better species -e.g. western red cedar. In IO years there will be
healthy, beautiful trees on site, instead of dead or dying spruce trees that have become infected with
needlecast disease due to stress.
Please give me a call if you have questions.
Respectfully submitted,
Washington Forestry Consultants. Inc.
(I . __ !r,h. ) ); /.
Galen M. Wright, ACF. ASCA
ISA Board Certified Master Arborist l\o. PN-129
Certilicd Forester No. 44
ISA Tree Risk Assessor Quali !led
URBAN/RURAL FORESTRY • TREE APPRAISAL • HAZARD TREE ANALYSIS
RIGHT-OF-WAYS • VEGETATION MANAGEMENT• ENVIRONMENTAL STUDIES • CONTRACT FORESTERS
Member of International Society of Arboricuiture and Society of Amencan Foresters
I
Firestone Complete Auto Care
17808 108th Ave SE
Renton, Washington, 98055
Technical Information Report
Commercial Redevelopment
1505 Westlake Ave. N
Suite 305
Seattle, WA 98109
T 206.522.9510
F 206.522.8344
www.pacland.com
.OJ-j' ~, 7
Prepared By: Luke Randles, P.E.
Reviewed By: Bill Fortunato, P.E.
Prepared: September 2016
Revised: January 2017
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 1&1IRII Page
EXECUTIVE SUMMARY ........................................................................................................................................... 2
SECTION 1-PROJECT OVERVIEW ............................................................................................................................ 4
SITE LOCATION ............................................................................................................................................................. 9
DRAINAGE BASINS, SUBBASINS, AND SITE CHARACTERISTICS ....................................... ,,.,,,,,,,.,,,,,,,,,,,,,,,,, •.•.•...•.•.•................ 10
~I~ ................................................................................................................................... 11
SECTION 2-CONDITIONS AND REQUIREMENTS SUMMARY ................................................................................. 13
SECTION 3-OFF-SITE ANALYSIS ............................................................................................................................ 17
SECTION 4-FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN .......................................... 19
HYDROLOGIC ANALYSIS ................................................................................................................................................ 19
EXISTING SITE HYDROLOGY ........................................................................................................................................... 19
DEVELOPED SITE HYDROLOGY ................•.............•.•...•........................•.•...•.. ,.,,,,,,,,,,,,,,,,,,,,,,,,,,,, •.•.....•......•.................... 20
FLOW CONTROL ANALYSIS ............................................................................................................................................. 20
WATER QUALITY SYSTEM ..............•.•.•.•.•...•.•.•.. , •.• , • , • , . , .................... , ... , ......................................................................... 21
SECTION 5-CONVEYANCE SYSTEM ANALYSIS AND DESIGN .................................................................................. 22
CONVEYANCE ............................................................................................................................................................. 22
100-YEAR FLOOD/OVERFLOW CONDITION ...................................................................................................................... 22
SECTION 6-SPECIAL REPORTS AND STUDIES ........................................................................................................ 23
SECTION 7-OTHER PERMITS ................................................................................................................................ 23
SECTION 8-CSWPPPANALYSISAND DESIGN ........................................................................................................ 23
SECTION 9-BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT ................................ 23
SECTION 10-OPERATIONS AND MAINTENANCE MANUAL ................................................................................... 23
APPENDICES: A -EXHIBITS
B-PLANS
PACLAND
C -DESIGN CALCULATIONS
D -OPERATIONS AND MAINTENANCE MANUAL
E-WATER QUALITY DEPARTMENT OF ECOLOGY CERTIFICATION
F -GEOTECHNICAL REPORTS
G -BOND QUANTITIES WORKSHEET
Project #10439013 Page 1
Firestone Complete Auto Care Technical Information Report Renton, Washington
Executive Summary
The project property is located at 17808 108'h Ave SE in Renton, Washington. The site is
bordered by 108'h Ave SE/WA 515 to the west, Jiffy Lube to the north, a vacant commercial
building to the south, and 109'h Ave SE to the east. There is also a residential property to the NE
as well. The site is currently developed as the Skipper's Seafood and Chowder House, which has
a building footprint of 2,552 square feet, with associated parking and landscaping. The entire lot
is approximately 0.88 acres in size. This project proposes to demolish the existing restaurant and
parking lot, then redevelop the site to become a Firestone Complete Auto Care.
The project site lies within the Lower Green River Subwatershed, which is part of the
Green/Duwamish Watershed. It is in the City of Renton Black River drainage basin.
The project site is located in the City of Renton Commercial Mixed Use Overlay District
(Community Planning area). The property is zoned CA (Commercial Arterial).
Design Criteria:
The City of Renton uses the King County Surface Water Management Design Manual
(KCSWDM), 2009 Edition, as adopted by the City of Renton and the City of Renton Amendments
to the King County Surface Water Design Manual, dated February 2010. The existing site is
developed and primarily impervious with the exception of landscape islands and an
undeveloped piece of land between the parking lot and 109th Ave SE. The proposed
development will lead to a slight increase in the amount of overall impervious area. Per the
requirements of KCSWDM, both flow control and water quality mitigation will be required as a
result of the proposed development.
Table 1
Jurisdictional Reouirements
Peak Runoff Control: Peak Rate Flow Control Standard
Matchina Existinq Site Conditions
2-vear: Match existina site conditions
10-vear: Match existinq site conditions
100-vear: Match existina site conditions
Water Quality: Enhanced Basic WQ Treatment
Preceding detention 60% of the developed 2-year peak
flow rate
Downstream of detention The full 2-year release rate from
detention facilitv
PACLAND Project #10439013 Page 2
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Firestone Complete Auto Care Technical Information Report Renton, Washington
Proposed Drainage System:
This project proposes to utilize a detention vault for storage and modular wetland system for
water quality treatment. The proposed grading will generally direct water from the northeast
corner of the site toward the west side of the site. There is currently a storm pipe that runs west
from 109'h Ave SE toward the building. The existing pipe will be relocated to the north edge of
the site, and will continue to receive and detain off-site runoff from the east.
Stormwater will collect into catch basins along the valley on the east and north side of the
building and be conveyed via pipe to the northwest corner of the site to the stormwater
treatment structure. After treatment, stormwater will be directed to a detention vault, which in
conjunction with a flow control structure, will provide flow control as required by the
jurisdictional requirements identified in Table 1. After detention, stormwater will be released
existing stormwater system in 108'h Ave. SE .
PACLAND Project #10439013 Page 3
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 1-Project Overview
Figure 1 -TIR Worksheet (KCSWDM 2009)
PACLAND
I
1,..1\.l; COi \,,J\. \-V\Sil!N{iTO'\. s:·lll \Cl· W,\lTR Df'S!GN :,.:,\:\{I,\[
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Piirt 1 PROJECT OWNER ANO
PROJECT ENGINEER
Pr0Jed Owner Real Property Investors, LLC
Phone {206) 522-9510
Add,ess 1505 Westlake Ave. N, Suite 305
Seattle, WA 98109
Project Engineer Luke Randles
Compaoy PACLAND
Phone (206) 522-9510
I Pan 2 PROJECTLOCATION AND ~
DE.SCRIPTION
Project Name Renton Firestone
DOES Permit# I
Loc.,tion Township ~2~3~N~---
r~c1nge 5 E
Section 32 (NE 1/4)
I Sile Md•ess t 7808 108th Ave SE
Renton, WA 98055
1 Part 3 TYP~ OF PERMIT APPLICATION I I Part 4 OTHER REVIEWS AND PERMITS
D Landuse Services
Subd;v1s0n .' Short Subd / UPD
IBJ Bu1ldirg Services
I D DFW HPA U Shorel:ne
U COE 404 M;rnag~mcnt
r:J Stn.;ctural
MlF i Commerical / SFR :J DOE Dam Safety
U FEMA Floodplain
0 COE Wetlands
Rockery/Vaultl __ _
]) Clearing and Grading LI ESA Sectmn 7
·:J Right-of-Way Use
D Other =~=--------------~
[J other __ _ __ J
Part 5 PLAN AND REPORT lNFORMATfON
TechnicaTlntomla'iioo Report Site Improvement Plan -(Engr. Pla"nSf
Type of Drainage Review ~I _Target~d Type (circle cne): ~/ Mad1f1ed
(r:1rde): ~ S,te ~I Sitt>
Date [include rev1s:on ll _ 1 Date (inc'.:.ide rcv1!>1<m
datesl: --------dates):
LI ~Da~t~e~oLfLF'L""~'~-------------_J_ Da:e nf F1rial: ___________ _
Part 6 ADJUSTMENT APPROVALS
Type (ci•r.le one) Standard I Complex l PreBppl<cation .I Exp<:rirr:cntal / Blanket
Description· (1flcludc conditions in TIR Section 2)
Date of Approval:
I ,J 20\lY
Project #10439013 Page 4
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Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Kll\C ('()l '\'IY, \\' \'il'l"..CilO!\. 'il_.'RF,,CL \\',\TTR IH:SIGN \L\\l .--\L
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Part 7 MONI fORING REQUIREMENTS
. ------------------------------·~---·-~----
:Von1todng ReqDired
S~art 0.l1e:
~ornpletion Date:
Yes@ ; Describe:--------------
j---------
i PM 8 SITE COMMUNITY ANO DRAINAG_E __ ~~~~r1_ _________ -------------i
! Ccrnrnu11i~y Plan : Benson Community Planning Area
i Spec,al Distnct Overlays: _,C,,oc_mc,m=erc,c=,ia,,_l "M"'ixc,ec,d_,U,,s"e'-----------------
1 Dra:."1;1ge Basin: City of Renton Black River Drainage Basin
L~~-:iwatcr_~:~~~=~~~~~~-~C:ty of Rfr~tM Amondmonts 10 tho 2009 Kin11 CountySurfo~ Wa1er Dasig~-~~:~~~
Part 9 ONSITE AND ADJACENT SENSITIVE AREAS
::J River.'Strearr ----------
:] Lake
:J Wetlands
D Closed Depression _______ _
LJ f'1oodp1a1n -----------
0 Ottler ____________ _
U Steep Slope --------
0 Erosion H8l:'Ht~ --------0 L,mdsiide H,uard
0 Coai Mirie Hanm:.! --------
0 Seismic Ha?md
r:J H~b,iat Prot,cct1an --------
0
-----------------------------
1·---
! PM iO srnLS
Soil Type
Alderwood Gravelly Sandy Loarn
, :J High GrourtdwatE!r Ti:lble {withCn 5 feet)
Slopes
010 t5%
~rosion Poi:ent1.al
I :::i Othe,
0 Sole Source Aqu·fer
Cl Seeps/Sor1ngs ====--__::_.::':":_""'::'.."_".___ ____ ,_-____ _
I __ J
[ 0 Additional St1eets Atlached
---------------------·-'--""--------·-----------___________________ ,
Project #10439013 Page 5
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
kl'i\(j CO[:;,,-.;rY. w .. \S[!t'.'\<iTO\:, SI 'Rf:\Cr: \\',\ l l.R DI Sl(ir\ M:\\'lL\'.._
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
-----------------------~-·-·--··---·-----------~
Pa,111 DRAINAGE DESIGN LIMITATIONS
REFERENCE
[El Core 2 Offsjte Analysis
D Serisitive.lCrilica! Areas
[El SEPA
LJ O!he,
O _______ ------
0 Additional Sheets Attac1ed
LIMITATION t SITE CONSTRAINT
--------------·--··------------------------------1
Part '12 TIR SUMMARY SHEET ····-· (prov1C8 one TIR Surnmarii Sheet per Thmi;hnh1 Oischcm;~ Are~! ---· _ _j
Threshold Discharge Area:
wlnc_ca,em_"-"e-'o"-r--'d"'ec,ss_crCJip~te,roc_n'-')----------------------·--~-
Core Requirements (all 8 apply)
---------------------
1------~sch;.r e at Natural Loca11on N1Jmber of NRluralprscharae La,,ce,a,,u,,·oc.nc,:s~: -'-------------i Offsite At)alysis Level 1 / 2 I 3 dated.:.--------
i-------------------------------j F!o~·J Control
I {Incl. tacitiry summary sheet)
_L_e_v_e-,,----.:(i)-2~i-3--o-, -E-,-.-.,-np-,-.o-n_N_u_rr_, b-e-, ::::::::--_·-_·_-_ ..• _. __ , __
Sm<'!II Sile BMPs j Conveyant:e Systern Spill containment located at:
-----------------·---------~~ Erosion and S-edsrr,ont Control ESC S1te Supervisor: TSO
Contact Phone
L ______________ , _____ After Hours P_0r=ocne;•c.....-------------·--·-·_j
M.ainlenance oind Operation Respons,tJihty: ~l Public I
Financial Guarar:!ees anti
If Private, Ma;ntenant;~..!LB.!:5~~---_Y~es~/cN~o~--------"
Provided: Yes / No
~b~--------·----~-------------==c'"-Wa!er Quality Type: Bas;c .: Sens. Lake .q_i,nanced B'asigu)Tfi'Og
(include facillty summary sheet} or Exemption No
-------·----------Landscape Manaqement Plan: (,Yes)/ Ne
§pe-cial Requiremen~as applicable) -----,.,.,--~--------1
Arc8 Spcc1f1c Drn1nage Type: COA ,1 SDO / MOP i BP I L:\IIP ,' Shared Fae
Requirements N;.1me:
Floodplain.lF!oodw.iy Odineati0'7i--''-"'"'-------------~--------
Type: Ma;or i' Minor l Exemption ~
100-year Base Flood Elevation {or range): ______ _
Dalum:
Describe:
Source Control -·-oescribe'landu-se: Commercial
\cx1mm ,lindustri~l landuse) Describe ariy structural controls: Not required
------·---------__J
1-t/ 2(.iil'j
J
Project #10439013 Page 6
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Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
----------------------
0:1 Control
Mainten3nce Agreeme•it: Yes ~
w:11, whom? ' -6ih.er Drainage Structures -----i
-Describe. --1
I
-------~-__J
Pas 13 EROSION AND SEDIMENT CONTROL REQUIREMEcN},S
:JURING CONSTRUCTION AFTER CONSTRUCTION
(El_ Clearing Lm1ts ;!) Sl<ibllt2£• E=x;msed Surfar.es
SIINIMUM ESC REQUIREMENTS r MINIMUM ESC REQUIREMENTS
[&I Cover Measures :XJ Remove and Re::;\ore Tcrr:porary ESC Fac1l1t1es
~ Perimeter Protection J [I Cletm ard Remove Ail Sili cind Debris, Ensure
'ii' ,· Operation of Permanent Facilities ~ T raf'ic Area Stab1li2ation
rx1 D Flag Limits of SAO and open space ~ se~1irnent Retention I preservation areas !EJ Surface Waler Collection
0 :Jewaleriny Cor1rGI
D Dusl Cnritml
_ D i:-1ow (_:ontrol __ ~·-·---
-____ J D-o-1h_e_, __________ _
114-STORMWATER FACILITY DESCRIPTIONS Note: Include F"acilit\l Summary_,md Sketch)· -· · · .-J --·-----------------,-------
__ 1 ____ Typ~/Desc::riofon __ Flo•,'\' Con~rol I Tvoc/DescriDtion Water qt!_a_:_ity --------
Detention ~ Bia'.ll:rat1on
;nfiltratio'1 D \/Vetpool
Reg!onal Facility 0 M~(jia Fdtration
Shared Facility D Oil Can\rJI
Flow Control D Soill Corltro1
u
BMPs
D Flow Control BMPs
otrer 0 Other l
'
Project #10439013 Page 7
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Part 15 f"ASEMENTStTRACTS ---------r-
. --·-·--·--
::] Drainage Easernen1
:.J Co•Jenarit
D Nativ~ Gm\i\~,h Protccl'or, Ccvcnant
D Trac:
D 01'1er
Part 16 STRUCTURAL ANALYSIS
0 Casl ir, ;iiace Vai...lt
I.J Ret:,iir,.ng Wah
D Rcckery > 4 · High
D StructJral on Steep Slope.
0 Otho•
!, or a crvir cngrnccr under my st.pervisi:m, m1ve Vitiiled the s,{e. A::1...a: s;te cont!iiior·,s as observed •.vere
1rco'porated into tni:. work~hrn:t .-1rd lt.c ~~tachcc Technical lnform;itim1 RF.port To the bes.I c! rny
knowledge !hf) infor ation pro 'ded nere is accurn'.e.
ott 1'oh.or:;;:.
Project #10439013 Page 8 -~
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Firestone Complete Auto Care Technical Information Report Renton, Washington
Site Location
Figure 2 -Site Location
Location: 17808 108'h Ave SE, Renton, WA 98055
Section/Township/Range: NE Quarter of Section 32, Township 23, Range 05
Parcel/Tax Lot(s): 3223059104
Size: 0.88 acres
City, County, State: Renton, King County, Washington
Governing Agency: City of Renton
Design Criteria: 2009 King County Surface Water Design Manual (KCSWDM), and the City of
Renton Amendments to the KCSWDM (February 2010)
PACLAND Project #10439013 Page 9
Firestone Complete Auto Care Technical Information Report Renton, Washington
Drainage Basins, Subbasins, and Site Characteristics
Drainage Basin
The project site is located in the Lower Green River Subwatershed, which is part of the
Green/Duwamish Watershed. It is in the City of Renton Black River drainage basin.
Existing Subbasins
The design of the existing site used a single basin with an area of 0.88 acres. The southeast
portion of the site of the highest in elevation at 410'. The area gradually sloped west until the
finished floor of the building about 402'. The northeast side of the site starts at an elevation of
408' and slopes downward toward the west side of the site where it has an elevation of 400'.
This whole subbasin creates a drainage system that allows water to flow from east to west. The
northwest corner of the site has a catch basin that conveyed water into the municipal
stormwater system. There is another discharge at the southwest corner of the site due to the
valley that runs east to west along the southern part of the site.
Proposed Subbasins
The proposed storm drainage system will be comprised of one subbasin. The north subbasin is
about 0.88 acres in size. Stormwater that lands north of the ridge follows the grading toward
the valley just north of the proposed building footprint and drains north to the detention
system. Water that lands in the south of the ridge drains into the valley and into a catch basin
which leads to the same stormwater pipe water that lands north of the ridge. Stormwater that
falls south of the retaining wall follows the grading below the proposed footprint and out
toward 108th Ave SE.
Table 2 -Site Areas
Surface Existing Area (SF) Proposed Area (SF)
Roof 2,S52 7,700
Landscaping 15,228 11,095
(Pervious)
Pavement 18,085 17,710
(PGIS)
Wood Deck 522 0
Sidewalk 1,756 1,602
(NPGIS)
Total 38,107 38,107
Site Characteristics
The property is located at 17808 108th Ave SE in Renton, Washington. The site is bordered by
108th Ave SE/WA 515 to the west, Jiffy Lube to the north, a residential area to the northeast, a
vacant commercial building to the south, and 109th Ave SE to the east. The site is currently
developed as the Skipper's Seafood and Chowder House, which has a building footprint of 2,552
PACLAND Project #10439013 Page 10
Firestone Complete Auto Care Technical Information Report Renton, Washington
square feet, with associated parking and landscaping. The entire lot is approximately 0.88 acres
in size. This project proposes to demolish the existing restaurant and parking lot, then redevelop
the site to become a Firestone Complete Auto Care.
The proposed project will include the construction of an approximately 7,700 SF Firestone
Complete Auto Care building. The overall paved area will be approximately 0.30 AC, and the
overall change in impervious surfaces (roof and pavement) is approximately 0.10 AC. Water
quality treatment will be provided for an area equivalent to the pollution generating impervious
surface on site.
Soils
Webs oil Survey
Figure 3 -Site Soils (USDA Web Soil Survey Map)
The site is mapped as Alderwood gravelly sandy loam Oto 8 percent slopes (AgB) and
Alderwood gravelly sandy loam 8 to 15 percent slopes (Ag() according to the USDA Natural
Resource Conservation Service, Web Soil Survey for King County Area, Washington.
Geotechnical Report
The following information was gathered from a report created by Zipper Geo Associates, LLC. on
August 29, 2016. 4 feet deep under the surface, ZGA's infiltration test recorded that the soil
observed was glacial till with medium dense, light brown with some oxidation, sandy loam with
gravel. Underneath this soil was unweathered glacial till consisting of dense, tan, sandy loam
with gravel. The bottom of the infiltration test was at 8 feet. The report showed dense, tan,
unweathered glacial till at this depth.
PACLAND Project #10439013 Page 11
Firestone Complete Auto Care Technical Information Report Renton, Washington
No groundwater was observed during the infiltration test. There were also no signs that the
seasonal groundwater may be higher than when observed.
ZGA performed a single small-scale Pilot Infiltration Test per standard of the Storm Water
Manual. The results of the test were that the infiltration test was approximately 0.21
inches/hour. According to Table 3.7 in the City of Renton's Amendments to the King County
Storm Water Design Manual, a correction factor of 4 must be used to derive the design
infiltration rate from the observed short term infiltration rate. After applying this correction
factor, the site has a design infiltration rate of 0.05 in/hr. The geotechnical report, along with a
previous report performed by Professional Service Industries, Inc., (PSI) are presented in
Appendix F.
PACLAND Project #10439013 Page 12
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Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 2-Conditions and Requirements
As required by the 2009 King County Surface Water Design Manual (KCSWDM) and City of
Renton Amendment, this project is subject to a full drainage review. Therefore, the storm
drainage design for this project is required to comply with all eight (8) Core Requirements, and
six (6) Special Requirements. The requirements have been met as follows:
Core Requirement #1: Discharge at Natural Location
All surface and storm water runoff from a project must be discharged at the natural location so
as not to be diverted onto or away from downstream properties. The manner in which runoff is
discharged from the project site must not create a significant adverse impact to downhill
properties or drainage systems.
Response: Onsite runoff will be collected, conveyed, and when necessary, treated. All onsite runoff
is subsequently conveyed to the City of Renton stormwater system. The city system discharges
northwest of the site into Panther Creek. No downstream impacts are anticipated as a result of the
proposed improvements as the impervious area will remain approximately the same.
Core Requirement #2: Off-site Analysis
All proposed projects must submit an offsite analysis report that assesses potential offsite
drainage and water quality impacts associated with development of the project site and propose
appropriate mitigation of those impacts. The initial permit submittal shall include, at minimum, a
Level 1 downstream analysis.
Response: See Section 3 of this report for a complete off-site analysis. A Level 1 downstream
analysis will be submitted upon civil plan submittal.
Core Requirement #3: Flow Control
All proposed projects, including redevelopment projects, must provide onsite flow control
facilities or flow control BMPs or both to mitigate the impacts of storm and surface runoff
generated by new impervious surface, new pervious surface, and replaced impervious surface
targeted for flow mitigation.
Response:
Per KCSWDM and the City of Renton amendments, flow control will be provided for Peak Rate
Flow Control Stondord Matching Existing Site Conditions. A stormwoter detention system and flow
control structure will be put in place to match pre-development conditions for the 2, 10, and 100-
year design storm events. A detailed summary and analysis of the existing and proposed
conditions is provided in Section 4 of this report.
PACLAND Project #10439013 Page 13
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Firestone Complete Auto Care Technical Information Report Renton, Washington
Core Requirement #4: Conveyance System
All engineered conveyance system elements for proposed projects must be analyzed, designed,
and constructed to provide a minimum level of protection against overtopping, flooding,
erosion, and structural failure.
Response: Portions of the existing conveyance system will be reused as part of this project with
additional conveyance added to accommodate the new building configuration and site layout. The
proposed conveyance system has been designed to convey the 100-year peak flow.
Core Requirement #5: Erosion and Sediment Control
All proposed projects that will clear, grade, or otherwise disturb the site must provide erosion
and sediment controls to prevent, to the maximum extent practicable, the transport of sediment
from the project site to downstream drainage facilities, water resources, and adjacent properties.
Both temporary and permanent ESC measures shall be implemented.
Response: Erosion and sediment control requirements will be an integral part of the project
construction documents. These measures will include methods to reduce erosion of onsite site soils
and to prevent sediments from inadvertently leaving the project site. Additionally, the ESC
measures will prevent sediment-laden discharge from entering the wetland or existing stormwater
water quality or flow control facilities.
Core Requirement #6: Maintenance and Operations
Maintenance and operation of all drainage facilities is the responsibility of the property owner,
except those facilities for which the City of Renton assumes maintenance and operation, and
must be maintained and operated in accordance with King County or other maintenance
standards as approved by the City of Renton.
Response: An Operations and Maintenance Manual is included in this report-see Section 10.
Core Requirement #7: Financial Guarantees and Liability
In accordance with RMC 4-6-030J, RDSD shall require all persons constructing any surface water
facilities (including flow control/water quality facilities, conveyance systems, erosion control, and
road drainage), to post with the City of Renton a bond, assignment of funds or certified check.
The applicant must also maintain liability insurance.
Response: See Section 9-Bond Quantities, Facility Summaries, and Declaration of Covenant. The
Site Improvement Bond Quantity Worksheet and Declarations of Covenants will be submitted
upon approval of the Building Permit plans.
PACLAND Project #10439013 Page 14
Firestone Complete Auto Care Technical Information Report Renton, Washington
Core Requirement #8: Water Quality
All proposed projects, including redevelopment projects, must provide water quality (WQ)
facilities to treat the runoff from those new and replaced pollution-generating impervious
surfaces and new pollution-generating pervious surfaces targeted for treatment.
Response: Enhanced Basic Treatment is required, as more than 50% of the runoff that drains to
the proposed treatment facility is from commercial land use. Additionally, an oil/water separator,
which will discharge to the sanitary sewer system, will be provided for discharges from the
building. A detailed summary and analysis of the water quality basin and design is provided in
Section 4 of this report.
Special Requirement #1: Other Adopted Area-Specific Requirements
The City of Renton may apply requirements for controlling drainage on an area-specific basis.
Potential other adopted area-specific requirements may include: Master Drainage Plans, Basin
Plans, Stormwater Compliance Plans, etc.
Response: The project site is within Washington State Water Resource Inventory Area 9:
Green/Duwamish and Central Puget Sound Watershed Salmon Habitat Recovery. However, the
proposed project will have no effect on any salmon habitats. The project site does not lie within
any City of Renton Moster Drainage or Basin Plans.
Special Requirement #2: Flood Hazard Area Delineation
If a proposed project contains or is adjacent to a flood hazard area as determined by the Renton
Department of Storm Drainage, the project must determine those components that are
applicable and delineate them on the project's site improvement plans and recorded maps.
Response: The project site does not lie within or adjacent to a City of Renton Flood Hazard Area
(determined by FEMA FIRM Panel 53033C0979F dated May 16, 1995) and therefore does not need
to apply the provisions of this requirement.
Special Requirement #3: Flood Protection Facilities
Proper analysis, design, and construction are necessary to protect against the potentially
catastrophic consequences if flood protection facilities such as levees and revetments should
fail.
Response: The proposed project will not rely on an existing flood protection facility, or modify or
construct a new flood protection facility.
Special Requirement #4: Source Control
If a proposed project requires a commercial building or commercial site development permit
then the water quality source controls applicable to the proposed project shall be applied in
accordance with the King County Stormwater Pollution Prevention Manual and Renton Municipal
Code N.
PACLAND Project #10439013 Page 15
Firestone Complete Auto Care Technical Information Report Renton, Washington
Response: Water quality source controls will be applied in accordance with the KCSWD/'1 and
Renton f'1unicipa/ Code IV. A pollution prevention plan has been included in section 8 of this
report.
Special Requirement #5: Oil Control
Projects proposing to develop or redevelop a high-use site must provide oil control in addition
to other water quality controls required.
Response: High use sites area defined as a commercial or industrial site that (1) has an expected
average daily traffic count equal to or greater than 100 vehic/es/1,000 SF of gross building area:
(2) is subject to petroleum storage in excess of 1,500 gallons per year; (3) is subject to use, storage,
or maintenance of a fleet of 25 or more diesel vehicles. The proposed development does not exceed
any of these thresholds, and is therefore not required to provide oil control.
Special Requirement #6: Aquifer Protection Area
If a proposed project is located within the Aquifer Protection Area as identified in the RMC 4-3-
050, this special requirement requires the project to determine those components that are
applicable and delineate them on the project's site improvement plans.
Response: The project is not located within an Aquifer Protection Area, and therefore this
requirement does not apply.
PACLAND Project #10439013 Page 16
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 3-Off-Site Analysis
Upstream Analysis
The municipal storm system coming from 109'h Ave SE ties into the existing private storm
system on the East side of the site. There is minimal tributary area attributes water to the site.
Stormwater runoff flows from the nearby residential streets and is guided by curbs into catch
basins before it reaches this site.
Downstream Analysis
After the runoff passes through the existing stormwater detention/treatment facilities, runoff
enters the municipal stormwater system at 108th Ave SE. After crossing over 108 1h Ave SE, the
system travels northwest about 2500 feet until discharge into Panther Creek. As discussed
earlier in the report, the storm runoff leaves the site at the northwest corner and enters into the
Renton Municipal storm system. The system runs underneath the Fred Meyer strip mall and
across SE Carr Rd until feeding into Panther Creek. A map of the downstream analysis can be
seen in Figure 4.
j
Figure 4 -Downstream Area (Renton COR Maps)
PACLAND Project #10439013 Page 17
Firestone Complete Auto Care Technical Information Report Renton, Washington
Conclusion:
The proposed stormwater management system for this project has been designed in accordance
with regulatory criteria described above and is consistent with sound engineering practice. The
site has been analyzed to determine the requirements for detention and water quality treatment,
and no significant adverse impacts to the stormwater management system are expected as a
result of the proposed development.
PACLAND Project #10439013 Page 18
i
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 4-Flow Control and Water Quality Facility Analysis
The City of Renton Amendment to the KCSWDM applies flow control standards based on
geographic areas as determined by the Flow Control Application Map. The project site lies
within a Conservation Flow Control Area. This requires a level 2 downstream analysis. This area
requires peak runoff control within the Flow Control Duration Standard Matching Existing Site
Conditions area such that it matches the flow duration of predeveloped rates for the existing
site conditions over the range of flows extending from SO% of 2-year up to the full SO-year flow.
This matches the flow duration of predeveloped rates for the existing site conditions over the
range of flows extending from SO% of 2-year up to the full SO-year flow.
Hydrologic Analysis
The existing and proposed site conditions were evaluated using both the King County Runoff
Time Series (KCRTS) The detailed KCRTS output has been included in Appendix C.
The historic 1-hour duration in the Sea-Tac rainfall region (location scale factor ST-1.0) was used
to model runoff in KCRTS.
Existing Site Hydrology
The existing site consists primarily of a single sub-basin. The site generally flows from east to
west, ranging from an elevation of 410 in the southeast corner to 400 at the western edge,
where a catch basin collects runoff and conveys it to the existing City of Renton municipal storm
drainage system in 1081h Ave. SE. The municipal stormwater system routes to a discharge point
of Panther Creek across SE Carr Rd. Adjacent properties to the north and south do not drain
toward the project, and therefore do not contribute any runoff to the drainage basin. A drainage
swale in the northeast corner of the site accepts runoff from 109th Ave. SE prior to being
collected in a 36" detention pipe, then released to the existing storm drainage system in 108'h
Ave. SE. The pre-developed conditions and existing peak runoff rates for the project site area are
shown in Tables 4 and S below. An exhibit showing the existing conditions is provided in
Appendix A. Existing peak runoff rates were determined using the King County Runoff Time
Series modeling software and the calculations can be found in Appendix C.
PACLAND
Table 4
Pre-Developed (Existing) Conditions
Area Condition
0.44 AC Pavement (PGIS)
0.37 AC Landscape/Wetland
0.059 AC Roof
*For KCRTS analysis, a fully forested condition
was assumed per City of Renton requirements.
Project #10439013 Page 19
Firestone Complete Auto Care Technical Information Report Renton, Washington
Table 5
Existing Peak Runoff Rate
Event Rate (cfs)
2-vear 0.028
10-year 0.044
100-vear 0.097
Developed Site Hydrology
The developed site will preserve the general configuration of the site, with runoff generally
flowing from east to west, being collected in catch basins located throughout the site prior to
being conveyed to a treatment structure and a detention facility, then released into the existing
system in 1081h Ave. SE. Therefore, existing drainage pattern and discharge locations will be
maintained. The existing detention pipe will be relocated to the northern portion of the site, and
will continue to receive and detain runoff from 109th Ave. SE. The post-developed conditions
and un-detained peak runoff rates for the entire basin area are shown in Tables 6 and 7 below.
An exhibit showing the developed conditions is provided in Appendix A. The proposed grading
and drainage plan is included in Appendix B. Developed peak runoff rates were determined
using the King County Runoff Time Series modeling software and the calculations can be found
in Appendix C.
Table 6
Post-Developed Conditions
Area Condition
0.44 AC Pavement (PGIS)
0.26 AC Landscape/Wetland
0.18 AC Roof
Table 7
Developed Peak Runoff Rate
Event Rate (cfs)
2-year 0.409
10-vear 0.615
100-vear 0.863
Flow Control Analysis
The post developed 100-year peak runoff rate for the overall site increases by 0.767 cfs from the
existing condition. Because the project is located in the Peak Rate Flow Control Standard area
and it does increase its developed 100-year peak runoff rate, additional flow control facilities are
required.
The proposed project includes installation of a subsurface open-bottom modular detention
vault system. A small amount of infiltration, based on the geotechnical information provided in
PACLAND Project #10439013 Page 20
Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix F, was taken into consideration in the design calculations. The total storage provided
by the vault system is 9,975 cubic feet, which is in excess of the required volume of 9,750 cf.
Water Quality System
In order to provide enhanced basic treatment as required by KCSWDM and the City of Renton
amendments, a modular wetland will be installed upstream of detention. The modular wetland is
intended to collect and treat runoff generated by the pollutant-generating impervious areas on
the site, mimicking the treatment effects of a wetland by utilizing a combination of pre-
treatment using separation and pre-treatment cartridges and treatment utilizing biofiltration.
The modular wetland systems have been granted General Use Level Designation (GULD) by the
Washington State Department of Ecology (DOE) for Basic, Enhanced, and Phosphorous
treatment. The approval documentation has been included in Appendix E.
Table 8
Water Quality Flow Rates and Facility Sizing
Basin Design Event Rate MWS-L-4-8-V Treatment
(cfs) Flow Rate (cfs)
A 2-year 0.190 (Downstream of Detention)
A 60% of 2-year
0.114 0.115 (Upstream of Detention)
PACLAND Project #10439013 Page 21
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 5-Conveyance System Analysis and Design
Conveyance
Per the 2009 King County Surface Water Design Manual, Section 4.2.1.2, the on-site stormwater
conveyance can be calculated based on gravity flow analysis of the piping network. Peak run-off
associated with and up to a 25-year storm event has been determined to be adequate. Uniform
flow analysis utilizing Manning's equation, shown below, was employed with a Manning's
Roughness Coefficient (n) of 0.012.
Manning's equation -Q= 1.4% xAxR 213 xS 112
With: Q = Flow (CFS)
n = Manning's Roughness Coefficient (0.012)
A = Flow Area (SF)
R = Hydraulic Radius = Area /Wetted Perimeter (LF)
S = Slope of the pipe (ft/ft)
Based on the revised basin areas and existing pipe sizes, the existing conveyance system is
adequate for the 25-year storm event All new conveyance pipes will also be designed to convey
the 25-year storm event Additionally, the overflow from a 100-year storm event will not create
or aggravate a severe flooding problem or severe erosion problem. See Appendix C for
conveyance design calculations.
100-Year Flood/Overflow Condition
Review of the current FEMA FIRM maps (Panel 0979 F) indicates that the project site lies within
the Zone X, which is determined to be outside of the 100-year flood plain. If the existing storm
system were to experience a major storm event, the stormwater detention area would overflow
in to the front access and drain out toward 108'h Ave SE.
The stormwater system for this project has been designed to address the storm events in
accordance with design criteria described previously. In the event of a larger storm, it is unlikely
that the system would fail. Based on a review of the site and immediate surroundings, the
overflow of the stormwater conveyance system would allow surface water to sheet flow to the
public storm system in 108'h Ave SE.
PACLAND Project #10439013 Page 22
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 6-Special Reports and Studies
The following Special Reports and Studies were used or have been completed for this project:
• Field Infiltration Testing-by Zipper Geo Associates
• FEMA FIRM Panels 0979F dated May 16, 1995
PACLAND Project #10439013 Page 23
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 7-Other Permits
The following governmental approvals or permits will likely be required for this project:
• City of Renton SEPA Determination
• City of Renton Site Plan Review
• City of Renton Building Permit
• City of Renton Construction Permit
• City of Renton Demolition Permit
These permits will require approval by the City of Renton Planning Division or the Department
of Ecology.
PACLAND Project #10439013 Page 24
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 8-CSWPPP Analysis and Design
All erosion and sediment control measures shall be governed by the requirements of the City of
Renton and the Washington State Department of Ecology. A temporary erosion and
sedimentation control plan will be prepared to assist the contractor in complying with these
requirements. The Erosion and Sediment Control (ESC) plan will be included with the
construction plans.
1. Erosion Risk Assessment
The degree of erosion risk on the proposed project site is minimal. Slope across the site is
minimal. Runoff will not travel at high velocities across the site and, therefore, will not cause
noticeable erosion impacts.
2. Construction Sequence and Procedure
The proposed development will include an erosion/sedimentation control plan designed to
prevent sediment-laden run-off from leaving the site during construction. The erosion potential
of the site is influenced by four major factors: soil characteristics, vegetative cover, topography,
and climate. Erosion/sedimentation control is achieved by a combination of structural
measures, cover measures, and construction practices that are tailored to fit the specific site.
Prior to the start of any grading activity upon the site, all erosion control measures, including
stabilized construction entrances, shall be installed in accordance with the construction
documents.
The best construction practice will be employed to properly clear and grade the site and to
schedule construction activities. The planned construction sequence for the construction of the
site is as follows:
1. Attend a pre-construction meeting with the City of Renton.
2. Install temporary erosion control features.
3. Demolish existing structure(s).
4. Clear and grub site.
5. Grade site.
6. Construct buildings.
7. Pave site and install landscaping.
8. Remove temporary erosion control features once site is fully stabilized.
PACLAND Project #10439013 Page 25
Firestone Complete Auto Care Technical Information Report Renton, Washington
3. Trapping Sediment
Structural control measures will be used to reduce erosion and retain sediment on the
construction site. The control measures will be selected to fit specific site and seasonal
conditions.
The following structural items will be used to control erosion and sedimentation processes:
• Stabilized construction entrances
• Filter fabric fences
• Catch Basin Inlet Sediment Protection
• Proper Cover measures
Weekly inspection of the erosion control measures will be required during construction. Any
sediment buildup shall be removed and disposed of off-site.
A stabilized construction entrance will be installed at the site entrance to avoid vehicle tracking
off mud off-site. The entrances are a minimum requirement and may be supplemented if
tracking of mud onto public streets becomes excessive. In the event that mud is tracked off site,
it shall be swept up and disposed of off site on a daily basis. Depending on the amount of
tracked mud, a vehicle road sweeper may be required.
Because vegetative cover is the most important form of erosion control, construction practices
must adhere to stringent cover requirements. More specifically, the contractor will not be allowed
to leave soils open for more than 14 days and, in some cases, immediate seeding will be required.
4. Wet Season TESC Operating Plan
Work between October P' and April 30 1h must adhere to the Wet Season Special Provisions
noted in the 2009 KCSWDM.
PACLAND Project #10439013 Page 26
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 9-Bond Quantities, Facility Summaries, and Declaration of
Covenant
The following items will be submitted upon application for the civil permits:
• Declaration of Covenant for Privately Maintained Flow Control BMPs
• Declaration of Covenant for Privately Maintained Flow Control and WQ Facilities
See Appendix G for a copy of the Bond Quantities Worksheet.
PACLAND Project #10439013 Page 27
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 10-Operations and Maintenance Manual
A manual detailing the operations and maintenance for all privately-maintained flow control and
water quality facilities has been prepared and can be found in Appendix D.
PACLAND Project #10439013 Page 28
Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix A -Exhibits
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report
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Firestone Complete Auto Care Technical Information Report Renton, Washington
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PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix B -Plans
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
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PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix C -Design Calculations
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Historic Time Series
KCRTS Command
CREATE a new Time Series
Production of Runoff Time Series
Project Location Sea-Tac
Computing Series Renton Firestone -Historic.ts£
Regional Scale Factor 1.00
Data Type Reduced
Creating 15-minute Time Series File
Loading Time Series File:C:,KC_SWDM,KC_DATA,STTF15R.rnf
Till Forest 0.88 acres Scaling Yr. 8
Total Area 0.88 acres
Peak Discharge: 0.096 CFS at 9:30 on Jan 9 in Year 8
8
Storing Time Series File:Renton Firestone -Historic.ts£ 8
Time Series Computed
Historic Peak Flow Rates
Flow Frequency Analysis
Time Series File:renton firestone -historic.ts£
Project location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak --Peaks Rank Return Prob
(CFS) (CFS) Period
0.057 2 2/09/01 17 :15 0.097 1 100.00 0 .990
0.017 7 l/06/02 2 :30 0 .057 2 25.00 0 960
0.041 4 3/06/03 18 :45 0 . 044 3 10.00 0 900
0. 002 8 3/08/04 18 :45 0 041 4 5. 00 0. 800
0 028 6 l/05/05 7 :30 0 .037 5 3. 00 0 .667
0 . 044 3 l/18/06 20 :15 0 .028 6 2 00 0 .500
0 .037 5 11/24/06 4 :15 0 .017 7 1 .30 0 .231
0. 097 1 l/09/08 9: 30 0 002 8 1. 10 0 . 091
Computed Peaks 0 .084 50. 00 0 .980
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Developed Time Series
KCRTS Command
CREATE a new Time Series
Production of Runoff Time Series
Project location Sea-Tac
Computing Series Renton Firestone -Developed.tsf
Regional Scale Factor 1.00
Data Type Reduced
Creating 15-minute Time Series File
Loading Time Series File:C:,KC_SWDM,KC_DATA,STTG15R.rnf
Till Grass 0.26 acres Scaling Yr: 8
Loading Time Series File:C:,KC_SWDM,KC_DATA,STEI15R.rnf
Impervious 0.62 acres Adding Yr: 8
Total Area 0.88 acres
Peak Discharge: 0.863 CFS at 6:30 on Jan 9 in Year 8
8
8
Storing Time Series File:Renton Firestone -Developed.tsf 8
Time Series Computed
Developed Peak Flow Rates
Flow Frequency Analysis
Time Series File:renton firestone -developed. tsf
Project location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak --Peaks Rank Return Prob
(CFS) (CFS) Period
0. 295 6 8/27/01 18 :00 0.863 1 100. 00 0 .990
0.206 8 9/17/02 17: 45 0.615 2 25 .00 0 . 960
0 .615 2 12/08/02 17 :15 0.409 3 10 00 0 .900
0 .238 7 8/23/04 14 :30 0.347 4 5. 00 0 .800
0 .334 5 ll/17/04 5: 00 0.334 5 3. 00 0 .667
0 .347 4 10/27/05 10 :45 0. 295 6 2 .00 0 500
0 .409 3 10/25/06 22 :45 0 .238 7 1 .30 0 .231
0 .863 1 l/09/08 6 :30 0 .206 8 1 .10 0. 091
Computed Peaks 0 .780 50. 00 0 .980
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report
Retention/Detention Facility Design
Retention/Detention Facility Design
Route Time Series through Facility
Time Series Found in Memory renton f1restone -developed tsf
Years Complete 8
Reservoir Routing [R/D Facility]
Inflow/Outflow Analysis
Peak Inflow Discharge. 0.863 CFS at 6 30 on Jan
Peak Outflow Discharge. 0.202 CFS at 9: 45 on Jan
Peak Reservoir Stage: 2.55 Ft
Peak Reservoir Elev· 2.55 Ft
Peak Reservoir Storage. 9942. Cu-Ft
0 . 228 Ac-Ft
9 in Year 8
9 in Y1:oar 8
Storing Time Series File:rdout.tsf
Durations & Exceedence Probabilities to File rdout.dur
Duration Plotting
Loading Flow Duration File.rdout.dur
Loading Flow Duration File:Renton Firestone -Historic dur
Retention/Detention Facility Information
Facility Routing Complete
Duration Calculation .. R/D Facility
Computing Interval Locations
Computing Flow Durations
Computing Durations:
Type of Facility:
Side Slope:
Pond Bottom Length
Pond Bottom Width:
Pond Bottom Area:
Top Area at 1 ft. FB:
Effective Storage Depth:
Stage O Elevation:
Storage Volume:
Vertical Permeability:
Permeable Surfaces:
Riser Head:
Riser Diameter:
Number of orifices:
Orifice#
1
2
Height
( f t )
0 00
1. 80
Top Notch Weir:
Infiltration Pond
0.00 H 1V
130.00 ft
30.00 ft
3900. sq. ft
3900. sq. ft
0.090 acres
2.50 ft
0 00 ft
9750. CU. ft
0.224 ac-ft
1200.00 min/in
Bottom
2 .50 ft
12 .00 inches
2
Full Head
Diameter Discharge
( in) (CFS)
0.60 0.015
1. 20 0.033
None
Outflow Rating Curve: None
Pipe
Diameter
( in)
4.0
Click Right Mouse Button or Press Any Key to continue
PACLAND Project #10507003
Renton, Washington
8Completed Yr 7
Firestone Complete Auto Care Technical Information Report
Historic vs. Developed Duration Anolvsis -·e·-···-"---------·---~ ----------------, . -·p~~:.·Dl,:~-ti~~-Az~~-KCRTS
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PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Developed Time Series -WO
Project location
Computing Series
Regional Scale Factor
Data Type
Creating 15-minute Time
KCRTS Command
CREATE a new Time Series
CANCELLED
KCRTS Command
CREATE a new Time Series
Production of Runoff Time Series
Sea-Tac
Renton Firestone WQ.tsf
1. 00
Reduced
Series File
Loading Time Series File:C:,KC_SWDM,KC_DATA,STEI15R.rnf
Impervious 0. 40 acres Scaling Yr: 8
Total Area 0.40 acres
Peak Discharge: 0.472 CFS at 6:30 on Jan 9 in Year 8
8
Storing Time Series File:Renton Firestone WQ.tsf 8
Time Series Computed
Water Quality Flow Rates
Flow Frequency Analysis
Time Series File:renton firestone -wq.tsf
Project Location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak --Peaks Rank Return Prob
(CFS) (CFS) Period
0.190 6 8/27/01 18: 00 0. 472 1 100.00 0 990
0.133 8 9/17/0 2 17 :45 0.360 2 25.00 0 960
0.360 2 12/08/02 17 :15 0 .259 3 10.00 0 .900
0.154 7 8/23/04 14 :30 0 .213 4 5 00 0 .800
0 .202 5 10/28/04 16 :00 0 .202 5 3.00 0 .667
0 .213 4 10/27/05 10 :45 0 .190 6 2 .00 0 .500
0 .259 3 10/25/06 22 :45 0 .154 7 1. 30 0 .231
0 .472 1 l/09/08 6 :30 0 .133 8 1 .10 0 .091
Computed Peaks 0 .435 50. 00 0 .980
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report
Conveyance Design Calculations
Manning's equation:
1.49/
Q= In xAxR 213 xS 1i 2
With: Q = Flow (CFS)
n = Manning's Roughness Coefficient (0.012)
A = Flow Area (SF)
Renton, Washington
R = Hydraulic Radius = Area /Wetted Perimeter (LF)
S = Slope of the pipe (ft/ft)
12" Pipe @ 0.5% slope:
1.49/
Q= In xAxR 213xS 112 = 2.94 CFS
n = 0.012
A = 0.771 (SF)
R = 0.286 @ 95% full
S = 0.005
Pipe capacity exceeds peak flows generated by development.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix D -Operations and Maintenance Manual
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Maintain Stormwater Facilities
The owner or operator of the project shall be responsible for maintaining the stormwater
facilities in accordance with local requirements. Proper maintenance is important for adequate
functioning of the stormwater facilities. The following maintenance program is recommended
for this project:
King County Surface Water Design Manual
NO. 5-CATCH BASINS AND MANHOLES
Candrtton When M.llf'l~mm,C< 15 Nudad
S,:emt1n: c:tc<Mll'.3 bf.:''i of thl! dep:n fro-ti !he
b:;t'.,:-,m ;it inc-;:::uch t.M.n lo ti'c l'Wert o1 the
'.'V'A'8.' pi~ tnto a-OJI c,l the ~:i:.11 basin .:it :1.
,.,.ni.o ~ 1r-.:tu:r. ,,1 the m•'<:" r.t tr,c 1,."!~1.1 ppr.
R:ei.ults E1r:pad•d Whan
M~"1ott1'!net it P•tfQnl"'d
Si.mi: -:.if c.a~h b;ssm co:,!'lf.:, ns r,:i
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~ h,:,::,I~ 1rrn1~~1~y ir !,,:;mt ~f t'll!' {.;J(d• bli?-i1,
0~1i-s e, f'S tk,<.kn-q c;,,pacil'.' r:/ lht-c~i~., 1:--,:;i"f
Oy IN«! ~r 1 IJX
No T111:,h v• ,j~b,i; l:u:;i?t,n;,i 9·
llo'.'!!K'.!'lt'r o~Jci".ir11; '='11tr~1"t:e '.e:J
-:;::,ll;h u~n
lr.t~h (;( ¢,;:,br~ n ll'tsl ,-.:.::::.-i N\111 ,i(l'; (•:t(""'t'.!i::. ND 1n,;1, {If e,::,nrt; .fl ll'.;i 1.<1'.L"I ~·iw1
':, tri~ r1@p,ti "'cvi1 ~" b()'."Am of l)a,;,r'I ;c ,rv"""r:: 11..:,
h_r.,"i'<,i p.p;;. ifltrJ C• (>JI 11! thf, hi11!1,.,
)e-ac ;:iirurur.ls. C1' veget:111::r, lt'.:rt cojY.I qe~·.,le
,:>i:IO'!. t,a,t ::::iUd :::.w~ CC<t'tl~;in:s u ~r,9r.rm.:!I.
g.ss= jc.i; me:11-~r.c:-;
:'Jt...:iOOi!il~ •JI ~n,ll!lfJ(' iei~Wt'Ottj;i 1 ("t.;i),¢ fc-,..,1 it,
'l(lj/.1n,'(<,
No ceac 111w•t:tls « ',"!qe"Jticn
present wti•ur uilch n~1r
"4-) tC-o1:1i;;:f\ µr1;<t,f;"tl whid' ·•o.iW
a!lt&.t o, supa'-"'t ';•10:: mt-.,,.-Jr1!( <JI
n)-!!d'£1 ,y ·vJt"!'Jh. 1---------+---------------lf-···~---·--·------------
~rm1i;,c: to 1rame
,1n:Ho·t~r., f.",';)b
Fr.YTlc ~ ~vr:n MU"! ci.rt: CIYt',(!r 1::f "':iirrc cxh"!n&. "tore 11"-.,ll ',~ inch r..:is.<:
o.1r:i f,)-:,i:: into th~ :;lrc<:1 (If .:tppi{t:;lble) _________ .....;;__;_ __ ...j_ _______ ·········--·--.. ·····-.. --
To.i 111&1 I-as t,~·,:oi,; htrjl'f' t!"1lll11 z. ~~"a," r1,;t~~,. :,r
(l'IY.:k'!-..,.\d~· ~!1~1 Y. r1d: 1---------------+----·--··---·----~-·-----~-
~f;imr. n::t ~t'.ng h.1r.t1 o!'I t...,p ~~-1 e i:;r~c :.. t.~ng :':us.', no top ~.10
.wi:~r~o:>r oi r.cu, !l'l;;n ;.-; or.!'! of ti~ tr..-n.ii !f.:)ff'
1---------•·'-'.".'s"''-'-"'.'---------------i-----··---------------
C-;,:.-...~" mill:. er
tx,U.,,,
Se'!lleMel"f.'
rrt.wJg"lm.-?f't
Cn«:~, wvJcr U'lllr> '--~ 1o;!1 ~,c '.?'1~' th.:PI S I~!.
an•; -:,'Xi~ of ,t:11 pi,ttd~ er~,!!'i--n-;i ca!c~
hM1r ~hr;:uqt ttacii..'1-:a n.3nh::1Mr-!! ~rv.n:
jl..d;;te$ fr.:tl tmt:tl b:1sin 1!!. un:.c,..ind
C..-tlt'f1 t,i,,ir '5 ?,,e,itfed llmi
~l\lt"ILr~Oy l50U"IC
Cr~r,k1; v,-.1e, tnAr, '.,', -n::tt i;.,io !<)"l!J"'<f ;ti..,, t tr;.)1 No cu-ck; rr,:1f;, lh~1\ ·:, 11"':'l w>1,; Flt
"I !ht' J(ll)l .:/ ... } ... ,1.,;11:,-,11t1,;..! tar,.,. {)r ~lY 1o·.1c..ir"lf" 1t, .. ,:,;:,int <11 ll'l~'fA.Jtlf!I c,ip ..
,Jf &(d P!tl'l•~~'!, t>t'tl~l'l2 ,cst(h Ot'k-ih tt'tWiJII
,;T&(Xi
Ca:::~ b.t:;;1!1 hil!i r.c:tlm! rr"O-'t! lt"'"'lll. 1 m,:h -,r h.:».
trl!;iitos:t MM!l t!'lnn :.! 1nr}u•.t. Out' !'If :.it,gnmer:
Cr~h w,Ji, \h&l'i ';,;..i"}t1, ~ '7ft .'.Hll u.f ll I'!!
11f•,+\.utl~ :n;:~~ :::1 m1,· e'lld""'11.:~ :,f "iio! eontt;,n,-..;i
'!:'1~ :;.:ikh u-n 111 !flt!< -01111 of th¥ 1ricl•1::,.i!N!I
81tS1r,. ~1:1r.:cd Cl' tcJ»1;1rc:j ~ Ol::$qr,
r.1.ir>:tan:-..
tko uatk~ in:,,~ lhtr '·;.rid· ·,1,i¢•.:' at
Tt,,: r,f"!t of 1dt-\'Mlt!l Pi:J~'!.
1----------IC0c~:.:."':.:.----------------1---·---------------·------·-·-
C-:ir:.amn.ar.c~ ,m .. 1
r...-.Jtm .. )r
All'J '1<.u1af.o'.'$$ f/ ,.a,,...1n-v-"1.in1-;. u p..1I.J11nn :.,,u:i-
Ai;. r..1. !yl!oc,i1r.:1 lt:rt1u.:it;:. surrl4t,; IY ;:);Jin!:
rrash ~nd ~h,1:,. 11,:,(v'l'Wl~~i ..-. lrh,.r/ot~I
P1'lt:-S ;u'IJ1,;l.1t<i l'!~l..c.tJU!"J an(i ,,v1-'"•)ttt:st:lesr
U>11Art.:iik. fCW)..lVJIC and osp.1~'ld r.t
;1(.C:('Af!ir-J t,, ,}()'11>-.-:..lhl~ -~LJ.;r;-.,r:!;
~l ...... (.l)f1l·~11 BMPt. l"l)lo;)n·..ei-nt.;,,d ·t
~W'•lPf~t,:. N;'} i"))(J(;l,i•1r~,.,t,.
J)l-ti!:'1:'4"ll tl:h~ i:-i&f, !! $,,.•~:'IC>! Qt 1'nt
No cr.:11::ks rrora th:1r •,, rich ·.-1e.., ~
:t,c ~1111 of m1: !riM•ou111:, ;up,:,
:.:r.ido-::;; wder L...,;m ',,. i11ct' .rt t>ic ,on! Cil Iha
•nel•c..Jtlnt p,~ :i, ~· ev1e..mcn of sot critcnr"SI
"'1 tni: ;om:; rl lte i11lr.t:::!l~! ppes '--------.&.--------'---'--------'.:..------'L------------"---
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 5-CATCH BASINS AND MANHOLES
Maintenance Dt!-fecl or Problem Condttlon When Maintenance ts Needed Results Expe<Gted When
Compone-nl Maintenance [,g. Performed
Metal Gra~-s Unsafe grate ,:">penong GtaltJ with opernng w1tier than '1b inch Gr.ale openi"lg moots d.es19n
(Ct1lch Bil$ins) slandard:,,
Trash and debris Trash and d€bris th.al is block.ing more than 20% Grate fre'!: of Ir.ash and det-ris.
of grate surfaCB. footnote to guid~ines for disposal
D.atrat1CW. or rni::.sinH Grille mis::.ing ar b"Oken memtn::r\::; f of !he !Jr ale Gr..ile 1S in pl,1,;;:!'.l arn.1 ,.,ei,L!;-d~~i9n
A.ny OJH!,n &tructura req'Uir•& urg,nt slanriar(:!s
main~nam::e. -
Mant\Qle Ct;iw~r:Lld Co~,e,1,ltd nrit ,n pl;lte cu ... t!rlhd 1s ri,~$1n9 or only p,art1.'lllY 1n pl.tt:tJ CtJ','t-:r.'lld p((lt,e-r.~s ¢ptm1n9 k)
Any open &tructurllil ~qi1ir•s urg;nt !>lfuclute.
mainllltflanc.e.
Lock,ng mec:h8nrSil'! MechJl"\1S.m c:ar1oot be oper1ed bv o~ MechAnit.rti upe,ns wilh pmpflr too!f.
Not Working ma1n1eosnce piYSoo "M:h proper roots 861tS
cannot be sea1ed. Sel'"-lockin9 ca ... erllid does not
work.
Coveti'l(l dirficuJt to One m..)intenat\r,e ptirnun cnnnol rl'Jmo11e cu~·erltid cnn L1i:i r1:•t10ved .ai'ld
R,e-fl),.)ve i~ov1:ri'l1d alter applyln9 80 lbs (11 Lft r~11'1s1aflt'r1 h·1 one: malnkinance
person.
NO. 6 -CONVEYANCE PIPES ANO DITCHES
Maintenance Defect cr PrcbJer,, Cor,cdiOo-n:11 When M.alnlenan« Is Ne11ided Results E:.:pe-et11id V\th(!-J'I
C0atnpo-l11tMt Mi1iltten;u11;:e ~ Pel'f~trnli:i.l
Proes Sed,O"'ent & debris .A.ccumufale-d se<limeM! or debris that e:t,::oods Waler flaws freely through _pipes
acrumulaiiar 20% of the diameter of the pip,&.
Ve9eta:t1011,'11m:s Vegern,iun/rWI$ lt\ilt re,juce tree 11\-0Vemt:nl or Wc'll!'.lr now5o rrm:fy through pipes
waler through 1)1pt!:S
Contaminants and Any e\•id;;.nc.'£1 of con1amin.ants ()(" pollution such Ma,eria!s removed and dfSpos-ed of
polk.rtion ai,; oil. gasolirw, can-:rl:100 slurries Of paint. accord•ng lo applicab-la regulations
Sourr.;o control BMP"§ imph:im,enlod if
<Jl;,p10()!"it1trJ No oonlaminan\s
p,-esent ot~r 1han a $url~ t>tl !ilrn
Damage to pr!hectrv-e Protd\•e CDeting is damaged: rust or c.orrosioo P~e repaired or replaced.
coating or c-orros1on is v.....akening 1he struclvral integri1y of any parl of
ptpe.
Damf:lged Any d~f that decres~~ the f:1'0$S s.eci1Qn area o1 P,pe repaired or replaced.
ptpe by more 1han 20~ or is determ1ne-d to have
woakooed slri..-aural ,nt~rity al the pipe.
Ditchos T~tM;h Md detlris Trash and ,::febri:s exc:e0d:s 1 cubic fool per 1.000 Tr.i:sh and debris cteareti fr0111
S!ll.;l!te !eel o1 dlt'\1", Md S-t:Jt)eS i'Mches
Sediment Accumulated sediment 1hal exceeds 20·% of the Ditch deanediflushed of all sed1m,:ant
acc.umulatior. deSf9n depth. aocl debos &o tr.at it matches design.
N¢~joos weeds Any noidovs or riuiS.1nce vegel.ttlon wt1id1 m;,v Ntlxlov$ Ar\(j nulS3tit;e veget;,11ion
t':Orl$t1t1,Jle a ti.val'd lo Covnly pet$M<ml or the rceroove-d acrordir19 to appbc..~ble-
public. re,guia11or,s.. Nt"J, danger of nax1aU!'I
vegelalioo wt.ere Count~· pers1'.lnn-el
cr the public might normally be.
Conlaminanls and My evidence or vontamin.anl:;. or p<>lluhori such M.ite:""3!S re1ll,Ov-C{l ;:1nd dtSpos-ed -or
pi:illvh<)r'I ~,s oiL gasoline,, con<:rete !'Jlumr.:s. 0t ;>.11m 3ccordfflg to appheahle tegvlatnms
So1,1rce oontmt BMPs 1mplem~nted 1f
appropnate. Na rontam1nants
pr-es.ent o1her th.an a swfac,e. Otl film.
Vr.:gclali:Qn Vegetation that reduces froo rr.,.,11¢mcn1 or wc1lor W~tcr nciws frc,c)y lhrou9h dili::hc:;.
!hrwgll dilr:he?S ~-----
Erosion rnimage ta Arly eroS!':.ln observea on a ditch slo~. Slopes are not eroding
stopes
Roel: llnittg tiu! or Otte ln'tf}r ot less ot roek. exists Mo~·e n;}ti~<e $()'11 R~plat>:e tm;k!. to (ft'JSi!)n $l;)ndards.
p!a<:!J nr rniS$<ng (If affHil S SQ;1are feti! or more any e~pos~ n;.lt1ve
Applicable i !!Oil.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 9-FENCING
Ml:!iinti:n.:i.n.ei: Oefer::t Qr Pr,oblem CQon(lit1ons When Malnlen;mce is Needed Re"¥ults E,:pectll!d Whe,n
Compcment Milintr;milncllil i& P;rf1>nnod --
S!te Erosion or holes Erosion or hol-es mor.f' ~han 4 ,~mes high and l 2-Na acc-ess under Lt10 f,;;ncc,.
undM fence 1 B Inches wide permitbng ac:,;s-s t!"lrou,;h an
opanin,g •Jnde:.-a fonce --------
W1JOO P!1~1$ a,1ard$ M1s.s,n,g of datn.'l~1t:-d Mi::..s.,ng ur broker'! hoards, p1J!C;l o;..il o' plurnti t,y No gaps. i:::rt ltirl(:lil flut.' 1u tni!l.$1n!J m
~rd Cros.s MembeB p8r1S mare than 6 1oches 01 cros~ members brc.i<:i:in broken bl'.l.v·t.1~. p.::,;;; olumb t,:::, y,,ithln
1 ',~ inches, i:rnss membe!S-sourd. ----·-~--·~~-.~.~--·----
Woaken-e:d by rotting My pa1 :;howing slrur.::lural de!erioration du-e 10 AU parts o-• fe<1(,t> are ~!nJ(\uraJly
or inscr;Ls rol\ing ry irtS(,'<:( dam.19¢ srJur'>{l
DaIT".aged .;,r fai~d Con-:r,e.t,: Cf me1al attachments d,e.t~riorated or Pos.1 found.a1,,::,n ca.pa~ uf
post fourtdation unabl,;;. to s.\Jpport posts. supporting posts even tr1 strong
wind.
M~!;)I PO'$\$, R..111s Dar'n3H~ part$-PoS-1 uut {:Ir ph.:rr\b m(lrr: tt-,:3n Fi 1nr.:hr.:$ Po(:1 pll1mb tt1 ,1,t1fhn 1 :·i 1rii::ht!$.
ard Fabric:
Top ra·4s b>E-nt mar-e tha.'161nches. Top rail ~reE cf bends greater than
1 inch
1V1y part 1)t for\~ •:1n1::.ud1n,g po!\.t. lop r,!'s1l!'io, ;:1nd f~r,.;e is Jli!'.tt>,t:d ;:met rne~ls d~$1fJrt
fab!'t1: / m11r-.!-!Mil 1 foal {lU! of des1g1"1 allgnmt!-nt st.ani:1a1d::;;.
-----·--------------
Missing or laos~ tension vlir-2. Tension wire in place .and holding
fabr.c. --
De1enor.a1ed paint o, Part Q( pArl,;i triat h.~~ a rus11n9 or ,;icabog Slru~tur.'!.lly M~quale-pc.is1~ 6r parts
prc1ect1'1£' ca.a11ng cand1ti-:in that !las a"'fee:1ed struct.Jral ad,e.quac.,•. with a un1fonn pr01ect111t: coa11ng.
O~nings in fabrk; O,oenings in ~a!Yii:. are su,:h that an 8-in,:h Fat:::,?ic mash openings within 50%, of
diitrncl-cr b.ill r:oultt !it through tJnti -:;iLC ------
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 10 -GA TES/BOLLARDS/ACCESS BARRIERS
M:ainteft.ance Oe~ct or Probl~ C1:n1'Gitk1ms When Maintemm~ is. N~cdNI R~'sults E:tp,!!clcd Whil!n
Compommt M.imt.11nanca lS Perklrme,11
Chei1•. Uok Fl!'!'itl:"lQ. Daol.3al!'d tw' 1'ni~r)}I Mi$":-ir'Y;1 !,il-:lll::f Wltir'l~it"'.>tl
GBt".:' fr,t-f11 t-t,r!>
Broftcn -:.r missr,g timg,cs sL<h It.II g.110 c;in,ct Hirigi:s 1rt.acl iYIC: 'ubcd. G.:11c, .::.
bl! c-.,1::.IJ ap<:ncd ttn:I clos.c1 by i1 m,urnr.r,;rncc: \'11:i:rtmg irec.l~.
p,nrs.:iri:
G.all! i,, (IUt ,:)f pi.Jrrti lrt')(~ tliflti fi i1X'tn.•'!l; d'!I!' c~11: ,:..iihr,rn<:."-:l .:111! •'t'rtK'-:11.
r1;.a!:'! !f-11:ln ""i ~\It.~ J;(,t i:I ;j~q:1 ill!,.1"1tr-::11l
Mn.'$;ng ~trr.kh~r b..lr. ~tr-!:lcht';r 11.v,d:; ~,rd hr.::. S1rnlr./-,.;:;r .m;r, b;m,;1:;, .;nD 1i,;:~ m
p~C.A
LiyJljr,q nt!r.:h!'mii:Hn Le:1di•19" df!'o'!CI!' •r1!!1Sin~. ru.fiJr•ctji:::v1ii1g :.ir llve!:J Lcdir19 tr~t.:hl:Sii~"ffl p,'!:'.,'l.!1"1~:.
th~!> ri.::,1 loc:k q11~ n:,l 1i1:k ~~ ::,'.l p11rl5. Qµ,;:,,-1i•11J";Jrq11l,:;,.
Dpuiin~ fl r~nr,.,e ,:}pArfr,g1; m fabiir. .UA ::..ir.h ~h,;t ;m H.nr.t F~'lra, ml1::ih 1,p,inrr:J!i wnfnf' !1!?};; af
d~mAhU b;:a(: >:'.{iiilC 111 ll'L"O.llzh gnd J.RJ..
Bm-~1~ t>;:,m~i:11:'d or rr1i~~rr.J Cr,J!i!I L'-"!1, ,:.ll),!!'~ rol !lwng op~"l o-d~:l. :':I-Cr:J!l!I b-!ir ~irig!I fuJy CIJ.ltm m:l
::"OS5 U:s-m~"'$ing o· i!I ~r.~ lo ·""~r~ it d:i~ "'to( pre,,.e-·1l do~d a11d pre·,!!'!11.:s ','l!',,ii.:b &~'Q!'!!l1!11.
... ~,i;;;;.: a<:"<:-"!':i:..
I ,x-Jong n-)4:1.-:t--,.,,.nu,m I or,k1n!] -.1.;·.K,;<· ,r:1:;:;lng. r:Q--l\1rcl.)n'ling, ~r d0f4& L c1,kln9 rr~i;ll;,ll"IIV,11 pr.;iw1r11s
{11)€11; r'°')l l(.(.I,; m'I~ not link ;;-0 ~ pans. op+?1'lt'l~ {It gat..;a
Si..ppcdi;:iizt ::'.<J.Jppm1 posl d:i~ nut ncid ::::to!:!'. Ila-up. Cr:is!I b:tr he,d up pre-;e-111.it:g ,,.chde-
d:!nl.!!Jt!d ,:,c,:c:;s irm faciily.
a,.,U,;n:~.; D~m.ai;ioo ~ rn1t-,;.1"tQ 6')t.;il\1 bfcjjBo. ni11lor.n9 <lc;;;.i; r,')J nt 11Yh) .;,,1iir,..)ri No ac.,~&:S tor n·i,1lc,r1zf.tct i•f.tft!":J!ls to
1){11':I ,)r /'"ii!"!~ b<c,&Bfl ,)f mi&&rt!, gM ,olc-~3CHI)•
Doc:s n::il lo;:;;.. Lo:ckin9 .:l!l!lfillt1y Cf' Jock :T1i::;::;~9 ar i:::3mct oc-No accc!SS br molor-izcd vchideis-ta
311:1-:he!d le to~ bcilari:: il'1 pl;x:<l':I, get 1nlo 'aciHy
60<.1k11:!'<l"; Di!:ilixi-:l1:rl 6oul~N:. ,....0( ncetM ro l):'l?"-":lf!{ -rotonzM ·.,elli,::te No acc;:;s 'kir rr·.,:,1onze,; 1(41',,,::1€\~ 1:-c
~l:IS. get ,,,10 ~atilt-,-
Crrcurrwf!'rr.1!C: Mutorixe.::I yefiid,e.s 9osrt3 ;3!0.Jrd cr belwc~ No ace,:,:,::; for molcrircd ·.,.chich:~ t::i
bai.ide:rs. get :nlc fac1tt),·
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 11-GROUNDS (LANDSCAPING)
Mainte~nce 0=-re-ct or PrciblC111 Con,,d;ti-1:ms When Milllnt1mzim:~ I~ t«!cdl!<l file,:ulh: EXp,l'!CICd Wft.en
Compommt Mamlmnanca ts Perlarm,a,d
Sil~ frilrSM Or litte,, Aiw 1r£11ill· !u'd ¢<:l!Jr,s.· .. +·,,t;h i;:i,:.,..(IC 1 tv~•.:: r,x,t T1 tl~h ::t1'1d Cl,i,t,t i:S :.o~f,r ,:('I fr,;;:11'1 Sl;tl
~I • .OCQ !qWt'!' rt"t"t ,:!h~ ,~ al;,_-.J1 l;;"i.iL-!11 lo 1111;;'
;;t'l•<.~Jr{ ;.ir ~';:t!:i;I ii wookJ !1::11.~ l,:i rir .JP ,:JJ~
~ld11d!lrd ~itt! ollii:t! g~rt:a---1~ ~~111. hJ 7'!l'<!!'fl!tl.
1J'H!t!! ~:a.id b,:, tio v~al e-.·d~r'<"!' L1 .Ju•r,png.
N,:n::.:-111:1; ,....,i..;i!'I~ Ai'I~· na,:.c.iis ,~, t1(1i(:.:ti1); • .-·~,;:,,.3~:ih(.n r,ir,1:::.n r,1.it Nf,-1(',,j!; ~HI ntJl~~f'l:'.ol ·,~ii\-"111:;n
rfr'll;.1111,:.;,1,;. hAf',iH<-1 Ii) G-01.nt~· r..::....,.o.--r•;d nr lh,;i ri;mc-••B!'I .;,:x~:ir,1m!) \o,;ippJi:~f.1
p;_Jl:h(: ti;l)o.d.;[)l)'IS 'llo ::l;rl!l.;ir <Jt n~:ti~v:,
'.l:;':)l:,;'Jli(),·i "'f!°lll-fP. CO.JI':':')' (i>:<'S0n"""'
ur Jh/::! i;:v'"JI,:-•i1iUhl l'>J1ri15,!ly l'ti
Cor.t..:11r1r..1.r.l'S ,:ird Mi• ~·,lcence-::ir ,:,ont.:lrrir.:irt5, -Jr i:.:.Ji.r.,Jr: wch f\fotcr.:lb. !"Cr'TlOVCC .-ird dl!.pcl!.IH: ::if
nollLton ;,s. ml l?ii:J:-0:llrru:-cr.n."7c1C :.ILITIC!: or p.iml ..ics:m:ling lo .ipptGll:iir. rc9u1;io0s'1!:.
S::iLrr.r., -: .... ,rb:ii -~f.AP::. rnp!crnC:!'tlc-,.11f
.ipp·~:-ir: ... "111l ~, i:r.t1l;animr1'1!li
r,r,;i::.1:1rr: r.<hAr lhKr .i Xl.<"telr.~ ol "IM
G~~s·t;r1.~·11:.:.>:,ii1t!r Gra~ or qr'..1i..1di.:1.,y~r ~;.;1:~~~ HI ir~fo:'~ ir: G---,'!:>~ m yrnvn.:cu,·~r 1r,:i..,-.:d ~ ;,
~iJh~, heigh! r,-,; r;r~:::iler u,:,:r, ti ir..:.t1t!'!..
I "411~ .¥1!l Slm1t:r;. H;irar:1 Ally lrnn ,'lr lrnb -:'If ;i lrA'-' d"l"lfl'lflil a:;. t,..wng ,,i No 'lil.7~1rd IHti.::;. n J;;,is.111:,,
~'"ll~'lliijl t0 1"4 ;;iri(: r.•11,1-1<1 i;,r~.pi:lrt!i' (!~rr.;iiJi;-!H
thr'!:'ate!!i hur:·)!:W 'ifeo . A hazM'd lr'="' id"='r~ifie-d bV
.1 qualified airborist mint ba l"d'mll'Vtld ;1.'$ won
~ po!is.ibl11.
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PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
N0.18 -STORMVVATERWETI.AND
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PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 24-CATCH BASIN INSERT
Maintenance Detect or Problem Conditions When Maintenance is. Neoded Results Expe<;te,d When
Compone-nt Mii!intefl,lmce i, Pe-rli;i,rmed
Media Insert Visible Oil Visible oil sheen passing through media Media inset replaced.
lnsen doos no! fit Flow g~ts into calch basin without going through Al! flow goes through media
ca!ch basin properly media.
Filter media plugged Filler media plugg,e.rJ Flow through frller medi;i is normal.
Oil absorbent media Media oil saturated. Oil absorbent me-d1a replaced.
saturated
Water saturated Catch basin insert ;s saturated w:ith water. which Insert replaced.
no longer has t!le capac.i1y to absorb.
Service life P.ll~l\!d~d Regular ift!Atval replacement due lo 1yp1cal Media replai::ed at manufai::h.irttr's
average !if.e of media insert product, typiLally one tAt:ommendM interval
mOtlUl,
Seasonal When storms occur and during the wet season, Remove. clean and replace or install
maintenance new insert after major storms,
monthly dunng the wet season or at
manufacturers recommended
inlervaL
PACLAND Project #10507003
Inspection Guidelines for
Modular Wetland System -Linear
Inspection Summary
MODULAR
WETLANDS
o Inspect Pre-Treatment, Biofiltration and Discharge Chambers -average inspection interval is 6 to
12 months.
• (15 minute average inspection time).
o NOTE: Pollutant loading varies greatly from site to site and no two sites are the same. Therefore,
the first year requires inspection monthly during the wet season and every other month during the
dry season in order to observe and record the amount of pollutant loading the system is receiving.
System Diagram
Cartridge Housing
Access to separation chamber
and pre-filter cartridges
Curb Inlet
Pre-filter Cartridge
Vertical Undm!rain
Manifold
GioMedioGREEN
1 Pre-treatment Chamber
· 2 · Biofiltration Chamber
3. Discharge Chamber
2
Drain-Down Line
Flow Control Riser
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3
MODULAR
Inspection Overview WETLANDS
As with all stormwater BMPs inspection and maintenance on the MWS Linear is necessary.
Stormwater regulations require that all BMPs be inspected and maintained to ensure they are
operating as designed to allow for effective pollutant removal and provide protection to receiving water
bodies. II is recommended that inspections be performed multiple times during the first year to assess
the site specific loading conditions. This is recommended because pollutant loading and pollutant
characteristics can vary greatly from site to site. Variables such as nearby soil erosion or construction
sites, winter sanding on roads, amount of daily traffic and land use can increase pollutant loading on
the system. The first year of inspections can be used to set inspection and maintenance intervals for
subsequent years to ensure appropriate maintenance is provided. Without appropriate maintenance a
BMP will exceed its storage capacity which can negatively affect its continued performance in
removing and retaining captured pollutants.
Inspection Equipment
Following is a list of equipment to allow for simple and effective inspection of the MWS Linear:
• Modular Wetland Inspection Form
• Flashlight
• Manhole hook or appropriate tools to remove access hatches and covers
• Appropriate traffic control signage and procedures
• Measuring pole and/or tape measure.
• Protective clothing and eye protection.
• 7/16" open or closed ended wrench.
• Large permanent black marker (initial inspections only-first year)
• Note: entering a confined space requires appropriate safety and certification. It is generally not
required for routine inspections of the system.
~I/ I\?
l
www.modularwetlands.com
..,.. •. L • . _ I T £ _
0i, ~
MODULAR
WETLANDS
Inspection Steps
The core to any successful stormwater BMP maintenance program is routine inspections. The
inspection steps required on the MWS Linear are quick and easy. As mentioned above the first year
should be seen as the maintenance interval establishment phase. During the first year more frequent
inspections should occur in order to gather loading data and maintenance requirements for that
specific site. This information can be used to establish a base for long term inspection and
maintenance interval requirements.
The MWS Linear can be inspected though visual observation without entry into the system. All
necessary pre-inspection steps must be carried out before inspection occurs, especially traffic control
and other safety measures to protect the inspector and near-by pedestrians from any dangers
associated with an open access hatch or manhole. Once these access covers have been safely
opened the inspection process can proceed:
• Prepare the inspection form by writing in the necessary information including project name,
location, date & time, unit number and other info ( see inspection form).
• Observe the inside of the system through the access hatches. If minimal light is available and
vision into the unit is impaired utilize a flashlight to see inside the system and all of its
chambers.
• Look for any out of the ordinary obstructions in the inflow pipe, pre-treatment chamber,
biofiltration chamber, discharge chamber or outflow pipe. Write down any observations on the
inspection form.
• Through observation and/or digital photographs estimate the amount of trash, debris and
sediment accumulated in the pre-treatment chamber. Utilizing a tape measure or measuring
stick estimate the amount of trash, debris and sediment in this chamber. Record this depth on
the inspection form.
www.modularwetlands.com
MODULAP.
WETLANDS
Inspection Steps
The core to any successful stormwater BMP maintenance program is routine inspections. The
inspection steps required on the MWS Linear are quick and easy. As mentioned above the first year
should be seen as the maintenance interval establishment phase. During the first year more frequent
inspections should occur in order to gather loading data and maintenance requirements for that
specific site. This information can be used to establish a base for long term inspection and
maintenance interval requirements.
The MWS Linear can be inspected though visual observation without entry into the system. All
necessary pre-inspection steps must be carried out before inspection occurs, especially traffic control
and other safety measures to protect the inspector and near-by pedestrians from any dangers
associated with an open access hatch or manhole. Once these access covers have been safely
opened the inspection process can proceed:
• Prepare the inspection form by writing in the necessary information including project name,
location, date & time, unit number and other info (see inspection form).
• Observe the inside of the system through the access hatches. If minimal light is available and
vision into the unit is impaired utilize a flashlight to see inside the system and all of its
chambers.
• Look for any out of the ordinary obstructions in the inflow pipe, pre-treatment chamber,
biofiltration chamber, discharge chamber or outflow pipe. Write down any observations on the
inspection form.
• Through observation and/or digital photographs estimate the amount of trash, debris and
sediment accumulated in the pre-treatment chamber. Utilizing a tape measure or measuring
stick estimate the amount of trash, debris and sediment in this chamber. Record this depth on
the inspection form.
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l_ ..
MODULA!',
WETLANDS
• NOTE: During the first few storms the water level in the outflow chamber should be observed
and a 6" long horizontal watermark line drawn (using a large permanent marker) at the water
level in the discharge chamber while the system is operating at 100% capacity. The diagram
below illustrates where a line should be drawn. This line is a reference point for future
inspections of the system:
l :i:···
~' --.:,
, Using a permanent marker draw a 6 inch long horizontal line, as shown, at the
i~ higher water level in the MWS Linear discharge chamber.
• Water level in the discharge chamber is a function of flow rate and pipe size. Observation of
water level during the first few months of operation can be used as a benchmark level for
future inspections. The initial mark and all future observations shall be made when system is
at 100% capacity (water level at maximum level in pre-treatment chamber). If future water
levels are below this mark when system is at 100% capacity this is an indicator that
maintenance to the pre-filter cartridges may be needed.
• Finalize inspection report for analysis by the maintenance manager to determine if
maintenance is required.
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MODULAR
WETLANDS
Maintenance Indicators
Based upon observations made during inspection, maintenance of the system may be required based
on the following indicators:
• Missing or damaged internal components or cartridges.
• Obstructions in the system or its inlet or outlet.
• Excessive accumulation of floatables in the pre-treatment chamber in which the length and
width of the chamber is fully impacted more than 18".
• Excessive accumulation of sediment in the pre-treatment chamber of more than 6" in depth.
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MODULAR
WETLANDS
• Excessive accumulation of sediment on the BioMediaGREEN media housed within the pre-
filter cartridges. The following chart shows photos of the condition of the BioMediaGREEN
contained within the pre-filter cartridges. When media is more than 85% clogged replacement
is required.
New
BioMeciaGREEN
0%
• Overgrown vegetation.
--Percent Clogged --· 100%
E>tlaJsted
BioMediaGREEN
• Water level in discharge chamber during 100% operating capacity (pre-treatment chamber
water level at max height) is lower than the watermark by 20%.
-w.modularwetlands.com
MODULAR
WETLANDS
Inspection Notes
1. Following maintenance and/or inspection, it is recommended the maintenance operator
prepare a maintenance/inspection record. The record should include any maintenance
activities performed, amount and description of debris collected, and condition of the
system and its various filter mechanisms.
2. The owner should keep maintenance/inspection record(s) for a minimum of five years from
the date of maintenance. These records should be made available to the governing
municipality for inspection upon request at any time.
3. Transport all debris, trash, organics and sediments to approved facility for disposal in
accordance with local and state requirements.
4. Entry into chambers may require confined space training based on state and local
regulations.
5. No fertilizer shall be used in the Biofiltration Chamber.
6. Irrigation should be provided as recommended by manufacturer and/or landscape
architect. Amount of irrigation required is dependent on plant species. Some plants may
not require irrigation after initial establishment.
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' I
_.,
l_
MODULAR
WETLANDS
Inspection Notes
1. Following maintenance and/or inspection, it is recommended the maintenance operator
prepare a maintenance/inspection record. The record should include any maintenance
activities performed, amount and description of debris collected, and condition of the
system and its various filter mechanisms.
2. The owner should keep maintenance/inspection record(s) for a minimum of five years from
the date of maintenance. These records should be made available to the governing
municipality for inspection upon request at any time.
3. Transport all debris, trash, organics and sediments to approved facility for disposal in
accordance with local and state requirements.
4. Entry into chambers may require confined space training based on state and local
regulations.
5. No fertilizer shall be used in the Biofiltration Chamber.
6. Irrigation should be provided as recommended by manufacturer and/or landscape
architect. Amount of irrigation required is dependent on plant species. Some plants may
not require irrigation after initial establishment.
-w.modularwetlands.com
MODULAfl
u WETLANDS
Maintenance Guidelines for
Modular Wetland System -Linear
Maintenance Summary
o Remove Sediment from Pre-Treatment Chamber -average maintenance interval is 12 to 24
months.
• ( 10 minute average setvice time).
o Replace Pre-Filter Cartridge Media -average maintenance interval 12 to 24 months.
• (10-15 minute per cartridge average setvice time).
o Trim Vegetation -average maintenance interval is 6 to 12 months.
• ( Service time varies).
System Diagram
Access to separation chamber
and pre-filter cartridge
(llrb Inlet
Individual Me-dia Filters
Pre-filter Cartridge
Cartridge Housing
.·, ·.
Vertical Underdrain
Manifold
GioMedioGREEN \>kriond
MEDIA
Pre-treatment Chamber
(.)f, Biofiltration Chamber
Discharge Chamber
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r /"'I.LLl"'\l ',IL' rlVJC:Lt Tr.l.V.JV/VVJ
Outlet Pipe
'-·
_l_
MODULAR
Maintenance Overview WETLANDS
The time has come to maintain your Modular Wetland System Linear (MWS Linear). To ensure
successful and efficient maintenance on the system we recommend the following. The MWS Linear
can be maintained by removing the access hatches over the systems various chambers. All
necessary pre-maintenance steps must be carried out before maintenance occurs, especially traffic
control and other safety measures to protect the inspector and near-by pedestrians from any dangers
associated with an open access hatch or manhole. Once traffic control has been set up per local and
state regulations and access covers have been safely opened the maintenance process can begin. It
should be noted that some maintenance activities require confined space entry. All confined space
requirements must be strictly followed before entry into the system. In addition the following is
recommended:
• Prepare the maintenance form by writing in the necessary information including project name,
location, date & time, unit number and other info (see maintenance form).
• Set up all appropriate safety and cleaning equipment.
• Ensure traffic control is set up and properly positioned.
• Prepare a pre-checks (OSHA, safety, confined space entry) are performed.
Maintenance Equipment
Following is a list of equipment required for maintenance of the MWS Linear:
• Modular Wetland Maintenance Form
• Manhole hook or appropriate tools to access hatches and covers
• Protective clothing, flashlight and eye protection.
• 7/16" open or closed ended wrench.
• Vacuum assisted truck with pressure washer.
• Replacement BioMediaGREEN for Pre-Filter Cartridges if required (order from manufacturer).
r::i-/· di ~ i
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1_
MODULAf\
WETLANDS
Maintenance Steps
1. Pre-treatment Chamber (bottom of chamber)
A Remove access hatch or manhole cover over pre-treatment chamber and position vacuum
truck accordingly.
B. \Nith a pressure washer spray down pollutants accumulated on walls and pre-filter
cartridges.
C. Vacuum out Pre-Treatment Chamber and remove all accumulated pollutants including
trash, debris and sediments. Be sure to vacuum the floor until pervious pavers are visible
and clean.
D. If Pre-Filter Cartridges require media replacement move onto step 2. If not, replace access
hatch or manhole cover.
Removal of access hatch to gain access below. Insertion of vacuum hose into separation chamber.
Removal of trash, sediment and debris. Fully cleaned separation chamber,
-.modularwetlands.com
(
-
2. Pre-Filter Cartridges (attached to wall of pre-treatment chamber)
A. After finishing step 1 enter pre-treatment chamber.
B. Unscrew the two bolts holding the lid on each cartridge filter and remove lid.
--------.
'~,,...,. ..
n
\rk_
~
MODULAR
WETLANDS
Pre-filter cartridges with tops on.
Inside cartridges showing media fitters ready for
replacement.
C. Place the vacuum hose over each individual media filter to suck out filter media.
Vacuuming out of media filters.
D. Once filter media has been sucked use a pressure washer to spray down inside of the
cartridge and it's containing media cages. Remove cleaned media cages and place to the
side. Once removed the vacuum hose can be inserted into the cartridge to vacuum out any
remaining material near the bottom of the cartridge.
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1-
MODULAR
WETLANDS
E. Reinstall media cages and fill with new media from manufacturer or outside supplier.
Manufacturer will provide specification of media and sources to purchase. Utilize the
manufacture provided refilling trey and place on top of cartridge. Fill trey with new bulk
media and shake down into place. Using your hands slightly compact media into each filter
cage. Once cages are full removed refilling trey and replace cartridge top ensuring bolts
are properly tightened.
Refilling trey for media replacement. Refilling trey on cartridge with bulk
media.
F. Exit pre-treatment chamber. Replace access hatch or manhole cover.
3. Biofiltration Chamber (middle vegetated chamber)
A. In general, the biofiltration chamber is maintenance free with the exception of maintaining
the vegetation. Using standard gardening tools properly trim back the vegetation to healthy
levels. The MWS Linear utilizes vegetation similar to surrounding landscape areas
therefore trim vegetation to match surrounding vegetation. If any plants have died replace
plants with new ones:
www.modularwetlands.com -
I
I
MODULAR
WETLANDS
Inspection Notes
1. Following maintenance and/or inspection, it is recommended the maintenance operator
prepare a maintenance/inspection record. The record should include any maintenance
activities performed, amount and description of debris collected, and condition of the
system and its various filter mechanisms.
2. The owner should keep maintenance/inspection record(s) for a minimum of five years from
the date of maintenance. These records should be made available to the governing
municipality for inspection upon request at any time.
3. Transport all debris, trash, organics and sediments to approved facility for disposal in
accordance with local and state requirements.
4. Entry into chambers may require confined space training based on state and local
regulations.
5. No fertilizer shall be used in the Biofiltration Chamber.
6. Irrigation should be provided as recommended by manufacturer and/or landscape
architect. Amount of irrigation required is dependent on plant species. Some plants may
not require irrigation after initial establishment.
-.modularwetlands.com
Inspection Form
Modular Wetland System, Inc.
P. 760.433-7640
F. 760-433-3176
E. lnfo@modularwetlands.com
www.modularwetlands.com
1-
MODULAR
WETLANDS
Inspection Report
Modular Wetlands System
l'i
£
,.. 0 0 u L " i\
WETLANDS
Project Name For Office Use Only
Project Address
'""' (Zip C!.de) (Rev lawed By)
Owner f Management Company
""'")
Contact Phone ( )
Office. personnel to Ctln1Jlete S11cth::ri to
-the left.
Inspector Name ---------------------Date I Time
Type of Inspection D Routine 0 Follow Up D Complaint D Storm Storm Event in Last 72-hours? D No D Yes
V'Jeather Condition Additional Notes
Inspection Checklist
Modular Welland System Type (Curb, Grate or UG Vault): Size (22', 14' or etc.):
Structural Integrity: Yes No Comments
Damage to pre-treatment access cover (manhole cover/grate) or cannot be opened using normal lifting
pressure?
Oam:ige to discharge chamber access cover (manhole cover/grate) or c.;nnot be opened using normal lifting
nressure?
Does the MWS unit show signs of structural deterioration (cracks in the wall, damage to frame)?
Is the inletloutiet pipe or drain do\.'1111 pipe damaged or other.-.ise not functioning properly?
Working Condition:
Is there evidence of illicit discharge or excessive oil, grease, or other automobile fluids entering and clogging th
unit?
Is there standing water in mappropnate areas after a dry period?
Is the filter insert (if applicable) at capacity and/or is there an accumulation of debris/trash on the shelf system?
Does the depth of sediment/trash/debris suggest a blockage of the inflow pipe, bypass or cartridge filter? If yes Dei:th:
specify wtiich one in the comments section. Note depth of accurrulation in in pre-treatment chamber
Does the cartridge filter media need replacement in pre-treatment chamber and/or discharge chamber?
Charrtier
Any signs of improper functioning in the discharge chamber? Note issues in comments section
Other Inspection Items:
Is there an acOJmulation of sedimentttrash/debris in the wetland media (1f applicable)?
Is it evident that the plants are alive and healthy (if applicable)? Please note Plant information below
Is there a septic or foul odor earring from inside the system?
Wasta: Yes No Recommended Maintenance Plant tnrormatlon
Sediment I Silt/ Clay No Cleaning Needed
Damane to Plants
Trash/ Bags/ Battles Schedule Maintenance as Planned
Plant Reolacement
Green Waste/ Leaves/ Foliage Needs lmrrediate Maintenance
Plant Trimm1nn
Additional Notes:
2972 $an Luis Rey Road, Oceanside, CA 92058 P (760) 433-7640 F (760) 433-3176
-
Maintenance Report
Modular Wetland System, Inc.
P. 760.433-7640
F. 760-433-3176
E.lnfo@modularwetlands.com
www.modularwetlands.com
MODULAR
WETLANDS
Firestone Complete Auto Care Technical Information Report Renton, Washington
Cleaning and Maintenance Report
Modular Wetlands System
Project Na-ne -------------------------------------
Fa Office Use Only
ProjectMdress -------------------------=~-~=~-----1mv1 (Zip COC&) _.,,
Owner/ ManagementCanpany _______________________________ _
,--,
om::a penor,nel to·complele stc!IQnlo
Contact --------------------
Phone ( .. lhe 1!111 •
Inspector Name -----------------Date Time ______ AM/PM
Type of lnspecuoo D Routine D Follow Up D Complaint D Storm Storm Event in Last 72-hours? D No D Yes
Wea1hE!f Condition Additiaial Notes
Condition of Media Operational Per
Site GPS Coocdtnates Manufacturer/ Trash Fciiage Sediment Total Debr1S 25/50ll5/100 Manufactures'
Map# of Insert Description/ Sizing Ao:::umu!ation Accumulation Acrumulation Acrumulation (will be changed Specificat1ais
@75%) ( If not, why?)
Lat MWS
Catch Basins
Lonn:
MWS
Sedimentation
Basin
Media Filter
Condition
Plant Condition
Drain Down Media -----Condition
Discharge Chamber
Condition
Drain Down Pipe
Condition
Inlet and Outlet
Rpe Condition
comments:
'2fJ72 San Luis Rey Road, Oceanside, CA 9'.2058 P. 760.433.7640 F. 760.433.3176
I
Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix E -Water Quality Department of Ecology
Certification
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
December 2015
GENERAL USE LEVEL DESIGNATION FOR BASIC, ENHANCED, AND
PHOSPHORUS TREATMENT
For the
MWS-Linear Modular Wetland
Ecology's Decision:
Based on Modular Wetland Systems, Inc. application submissions, including the Technical
Evaluation Report, dated April I, 2014, Ecology hereby issucsthe following use level
designation:
1. General use level designation (GULD) for the MWS-Lincar Modular Wetland Stormwater
Treatment System for Basic treatmenl
• Sized at a hydraulic loading rate of I gallon per minute (gpm) per square foot (sq ft) of
wetland cell surface area. For moderate pollutant Joading rates (low to medium density
residential basins), si7.e the Prefilters at 3.0 gpm/sq ft of cartridge surface area. For high
loading rates (commercial and industrial basins), size the Prefiltcrs at 2.1 gpmlsq ft of
cartridge surface area.
2. General use level designation (GULD) for the MWS-Linear Modular Wetland Stonnwater
Treatment Syste1n for Phosphorus treatment
• Sized at a hydraulic loading rate of I gallon per minute (gpm) per square foot (sq ft) of
wetland cell surface area. For moderate pollutant loading rates (low to mcdiwn density
residential basins}, .si1,,e the Prefilters at 3.0 gpm/sq ft of cartridge surface area. For high
loading rates (commercial and industrial basins), size the Prefilters at 2.1 gpmlsq ft of
cartridge .surface area.
3. General use level designation (GULD) for the MWS-Linear Modular Wetland Stormwater
Treatment System for Enhanced treatment
• Sized at a hydraulic loading rate of I gallon per minute (gpm) per square foot (sq ft) of
wetland cell surface area. For moderate pollutant loading rates (low to medium density
residential basins), size the Prefilters at 3.0 gpm/sq ft of cartridge surface area. For high
loading rates (eommercial and industrial basins), size the Prefilters at 2.1 gpm/sq ft of
cartridge surface area.
PACLAND Project #10507003
I
Firestone Complete Auto Care Technical Information Report Renton, Washington
4. Ecology appro\'es the MWS -Linear Modular Wetland Stormwater Treatment System units
for Basic, Phosphorus. and Enhanced trealment at lhe hydraulk loading rate listed above.
Designers shall calculate the water quality design flow rates using the following procedures;
• Western Washington: For treatment installed upstream of detention or retention, the
water quality design flow rate is the peak 15-minute flow rate as calculaled using the
latest version of the Western Washington Hydrology Model or other Ecology-approved
continuous nmoff model.
• Eastern Washington: For treatment installed upstream of dctcnlion or retention. the
water quality design flow rnte is the peak 15-minute flow rate as calculated using one of
the three methods described in Chapter 2.2.5 of the Stormwater Management Manual
for Eastern Washington (SWMMEW) or local manual.
• Entire State: For treannent instatled downstream of detention. the water quality design
flow rate is the full 2~ycar release rate of the detention facility,
5. These use level designations have no expiration date hut may be revoked or amended by
Ecology, and arc subject to the conditions specified below.
Eso'oef, Conditions of lJse;
Applicants shall comply with the following conditions:
I. Design, assemble, install, operate, and maintain the MWS Linear Modular Wetland
Stom1,vater Treatment System units, in accordance with Modular Wetland Systems, Inc.
applicable manuals and documents and the Ecology Decision.
2. Each site plan must undergo Modular Wetland Systems, Inc. review and approval before
site installation. This ensures that site grading and .slope are appropriate for use of a MWS
Linear Modular Wetland Stormwatcr Treatment System unit.
3. MWS -Linear Modular Wetland Stom1water Treatment System media shall conform to the
specifications submincd to, and approved by, Ecology.
4. The applicant tested the MWS -Linear Modular Wetland Stormwater Treatment Syslem
with an external bypass weir. This weir limited the depth of water flowing through the
media, and therefore the active treatment area. to below the rool zone of the plants. This
GULD applies to MWS-Linear Modular Wetland Stonnwater Treatment Systems whether
plants arc included in the final product or not.
5. Maintenance: The required maintenance interval for stormwater treatment devices is oft.en
dependent upon the degree of pollutant loading from a particular drainage basin. Therefore,
Ecology docs not endorse or recommend a .. one size fits all" maintenance cycle for a
particular model/size of manufactured filter treatment device.
• Typically, Modular Wetland Systems, Inc. designs MWS -Linear Modular Wetland
systems for a target prefilter media life of6 to 12 months.
• Indications of the need for maintenance indudc cffiucnl flow decreasing to below the
design flow rate or decrease in treatment below required levels.
• Owners/operators must inspect MWS ~ Linear Modular Wetland systems for a minirnurn
of twelve months from the start of post-construction operation to determine site-specific
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
maintenance schedules and requirements. You must conduct inspections monthly during
the wet season, and every other month during the dry season. ( According to the
SWMMWW, the wet season in western Washington is October 1 to April 30. According
to SWMMEW, the wet season in eastern Washington is October 1 to June 30). After the
first year of operation, owners/operators must conduct inspections based on the findings
during the first year of inspections.
• Conduct inspections by qualified personnel, follow manufacturer's guiddines. and use
methods capable of determining either a decrease in treated effluent tlowrate and/or a
decrease in pollutant removal ability.
• When inspections are performed, the following findings typically serve as maintenance
triggers:
• Standing water remains in the vault between rain events, or
• Bypass occurs during stom1:s smaller than the design storm.
• If excessive floatablcs (trash and debris) are present (but no standing water or
excessive sedimentation). perfonn a minor maintenance consisting of gross solids
removal. not prefilter media replacement.
• Additional data collection win be used to create a correlation bet\Veen pretreatment
chamber sediment depth and pre-filter clogging (see Issues to be Addressed by the
Company section below)
6. Discharges from the MWS -Linear Modular Wetland Stonnwatcr Treatment System units
shall not cause or contribute to water quality standards violations in receiving waters.
Applicant:
Applicant's A<l<lrcs.s:
Applkation Documents:
Modular Wetland System~. Inc.
PO. Box869
Oceanside, CA 97(}54
• Original Apf>lkation for Condi1ional lhe Le\·el Designation, Modular Wetland System,
Linear Stormwater Filtration System Modular Wetland Systems. inc., January 2011
• Quality Assurance Pr<~/t!ct Plan: Modular \Vctland system -Linear Treatment System
performance Mnnitoring Project, draft. January 2011.
• Revised ApplicationffJr Conditional Use lend De.-.ignation. Modular \Vetland System,
Linear Stonnwater r"iltration System Modular Wetland System:-, Inc., May 20I 1
• Memomndum: Modular If/et/and !})·st(;•111-Unear GULD Applicatior, Supplementary Data.
April 20/4
• Technical Evaluation Report: 1Wodular JVi,tfmrd Sys/em S10rm1•,:a1er frealment SysJem
P,:rfOrmance Moniroriltg, April 1014.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Applicant's Lst Le,•el Request:
General use level designation as a Basic. Enhanced, and Phnsphoru.s treatment device in
l!Ccordance with Ecology's Guidance for Evaluating Emerging Stonnwater Treatment
Technologies Techn0logy Asscssmem Protocol -Ecoi()gy (TAPE) January 2011 Revision.
Applicant's Performance Claims:
• The ~1WS -Linear Modular wctlv.nd is capable of removing a minimum of 80·percent
ofTSS from stormwalcr with influent concentrations be-tween IOO and 200 mg.:'I.
• The 7\·1\VS -I .in ear :,..,fodu!ar wetland is capable of removing a minimum of SO-percent
of Total Phosphorus from stormwatcr with influent conccntrntions between 0.1 and 0.5
mg/l.
• The :\1WS Lineal' Modular wetland is capable of removing a minimum of 30~pcrcc:nt
of dis:,;.olved Copper from stom1water with influent concentrations between (J.005 and
0.020 mg/I.
• The MWS -Linear Modular wetland is capable of removing a minimum of60-pcrl'cnt
of dis:mlved Zinc from s.tormwatcr wilh intlucot c:oncentrations between 0.(12 and 0 . .10
mg/I.
Ecology Recommendations:
• }i.fotlular \Vctland Systems. Inc. has shown Ecology. through luburntory and field-
testing, that the MWS -Linear Modular Wetland Stom1water Treatment Sys.tem filter
s.ys.tcm is capable of attaining Ecology·s Basic. Total phosphorus, and Enhanced
treatment goal~.
Findings of Fact:
Laboratm·y T cstin1!
The MWS-Linear Modular \Vctland has the:
• Capability Lo remove 99 percent of total suspended solids (using Sil-Co-Sil l 06) in a
quarter-scale model with influent concentrations of270 mg/L.
• Capability to remove 91 percent of total suspcndcU solids (using Sil~Co~Sil 106) in
laboratory conditions with influent concentnttions of84.6 mg/Lat a flow rate of 3.0
gpm per square frmt of media.
• Capability to remove 93 percent of dissolved Copper in a quarter-scale model with
influent concenrrations of0.757 rng/L.
• Capability to remove 79 percent of dissolved Copper in laboratory conditions with
influent concentrations of 0.567 mg/Lat a flow rate of J,0 gpm per square foot of
mc<lia.
• Capability to remove 80.5-percent of dissolved Zinc in a qua11er-scale model with
influent concentration:-. of0.95 mg/Lat a tlow rate of3.0 gpm per s.quarc foot (if media.
• C"'p~bility to remove 78-percenl of dissolved Zinc in laboratory conditions with influent
co11c(.11trations of 0. 75 mg.-'L at a tlow rate of 3.0 gpm per S4..1U.arc foot of mctha.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Field Testing
• fVlodular Wetland Systems, Inc. C()nduded monitoring of an MWS-Linear (Model
# MWS-L-4-13) from April 2012 through May 2013. at a transportation maintenance
facility in Portland, Oregon. The manufacturer collected Oow-\.veighted composite
samples of the system's influent and effluent during 28 separate stom1 events. The
system treated approximately 75 percent of the rnnoff from 53.5 inches of rainfall
during the monitoring period. The applicant .sized the system at 1 gpmisq ft. (wetland
media) and 3gpmlsq t\. (prefilter).
• Influent TSS conccntrntions for qualifying sampled storm events ranged from 20 to .B9
mg/L. Average TSS removal for influent concentrations greater than 100 mg/L (n=7)
averaged &5 percent. For influent concentrations in the ra.ngc of 20-100 mgil {n= 18),
the upper 95 percent confidence interval about the mean effluent concentration was
12.8 mg/L
• Total phosphorus removal for 17 events with intluc11t TP concentrations in the range of
0.1 to 0.5 mg/L averaged 65 percent. A bootstrap estimate-of the lm.vcr 95 percent
confidence limit (LCL95) oft he mean total phosphorus redut'tion \Vas 58 percent
• The lower 95 percent confidence limit of the mean percent removal \Vas 60.5 percent for
dissolved zinc for influent concentrntions in the range nf0.02 to 0.3 mg!L (n~]] ).
TI1e lower 95 percent confidence limit ofrhe mean percent removal was 32.5 percent for
dissolved copper for influent concentrations in the range of 0.005 to 0.02 mg/L (n= 14}
at flow rate.~ up to 2X gpm (design flow rate 41 gpm}. Laboratory test data augmented
1hc data set. showing dissolved copper removal at the design tlO\\.' rate of 41 gpm (93
percent reduction In influent dissolved copper of 0. 757 mg/L).
lssue-s to be addresstd by the Company:
l. Modular Wetland Systems. Inc. !>hould collect maintenance and inspection data for the
first year on all installations in the ;>Jorthwest in 1..1rder to assess standard maintenance
requirements for various land uses in the region. Modular Wetland Systems, ]nc. should
use these data to establish required maintenance cycles.
2. Modular Wetland Sys.terns, Inc. should collect pre-treatment chamber sediment depth
data for the first year of operation for all installations in the Northwest. Modular
Wetland Systems. Inc. will use these data to create a correlation bern1een sediment depth
and pre-filter clogging.
l'echnology Description:
Download at http://w\1.w.modulan:vcthm<ls..com/
Contact Information:
Applicant: Greg Kent
Modular Vilclland Systems, Inc.
P.O. Rox 869
Oceanside, CA 92054
gkent.rii.hiocleaneni'ironmental.net
Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Applic.-ant v,,ebsite: http://www.moduh;1wetlantls..i.:um·
Ecology \"v'eb link: http 1.,www.i;cy.w;u~nv 1pn10rams,\,,:g:!s1nrmwateunewtechiimlexJ1tml
Ecology:
Rlwision Histon
Date
June 2011
September 20 I:!
Janual'y 2013
l)ecember 2013
April 2014
December 20 t 5
Douglas C. Howie. P.E.
Department of Ecology
Water Quality Program
(360) 407-6444
dou !!las. lww1cr<hxv. \\'J. gov
RtYision
Origi1rnl use-l~vel-designati(m document
Revised dates for TER and expiration
Modified Design Storm Description. ;idded Revision Table . .idded
maintenance di~..:w;sion, modified fmmat in ac~·ortlantc \'iilh Ecology
standard
Updated name of Applicant
Approved GULD designation for Ba:-:ic, Phosphorus. and Enhanced
treatment
Updated GULD to <locum;.:nt thl'. acci.:pl.:mcc of l\1fWS-Linc.ir
Modular Wetland installations ,vith or without the inclusion of plants.
Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Appendix F -Geotechnical Reports
(Presented Without Appendices)
Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report
PACLAND
GEOTECHNICAL ENGINEERING REPORT
Firestone Retail Store
17808108th Ave SE
Renton, WA 98055
PSI PROJECT N0.07121375
June 1, 2016
Prepared for:
Bridgestone Retail Operations. LLC
333 E. Lake Street
Bloomingdale, IL 60108
Prepared by:
Professional Service Industries, Inc.
20508 -56'" Ave W, Suite A
Lynnwood, WA 98036
Project #10507003
Renton, Washington
l iJb1fim11a1io11
• 1i> Build 011
,,, .............. ,.. ... 19 • CWultlnp • 1Htlnf
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
l iJin(<m11atio11
• lh Build On
Engineering • Con,ultlng • Testing
Brdgestcne Re:ail O~era:1ons LLC
333:: : a.ke St~eet
Bloornng:::iae !L 50108
ATTENTION:
Subject:
I )enrrs /,psay
Ema; ~.nsc~Dennis@::/usa corr
Geotechnical Investigation
Firestone Retail Store
17808108th Ave SE,
Renton, Washington
PSI Report No. 07121375
::,~cfess oral Service lna ... sir-es tnc :'PSI) 1s p'.eased to 5Linnv1 a re!"iort n• cur genrechnical
!Pves~:gat1C·"l 'or tre proposed F1res:::me Retai Store to ce 1ocated a~ 17808 10ff'· . .:...ve SE in Re:i~on
'./Vashingl::r. Ths report su'TYnarizes tne wo~k accomp!1she:i and orovides c,..1r ·ecornrne'"'.dations
~er design and constr..;ctlon of the prop-:'.)sed prc;ec: PS! perfor-ned t!ie req·..1ested geoteclr·ca'
1''Vesttga: on sery1n:s 1n general acco~dance vmh the corsLftarl agreemen: dated May 2 2016
6<::1se::i on 1he res..J!:s of o·.ir i,e d investigofa:m. !aocratory testing aPd eng neenng ana1ys1s the
proposed site is Si,rlacte fo' :11e cons;~uct1on of the proposed improvements from a geotec:hn1c;:~1
standpoint prov ded the recorrrrer.dat;ons o; this report we 'o!iowed. ~eCO'TF'1~nda:icns
regeirding the geotechri:.::al aspects of vo;ec; design and constn.:ct.on a~e presenied 1., the
at1ached report
PS! aµprec•a:es :tie opporturn'.y :o con:ribute our services and ooks for1Nard to worKing with you
dur rig Jesign and construct1on oi t'"l1S prCjec~ P1ease cor,tact tt--e ,,nde~s-gned d1~ectly if yot; !<ave
quesk::iris pertaining :o this IYOJect
PROFESSIONAL SERVICE INDUSTRIES. INC.
Richard C f-re:inc.c:sen. LC L E G
Project 2.eolog•sl
r:.!.E.~a_r~.-~::.t:=~E~-~~~!.:.:.E•rs 1u s a cc r:·
Project #10507003
?rmc1Dai Corsultant
Firestone Complete Auto Care
f.1r,·</,m( /fr1.rrl S,,.,,...
/ ~)'(JX f!!S''. fl\' ~f.'. Flfr,U,11 JJ",1</1111J.:/.ir1
I'S/ p,.,./,·,: s,.11~1~13-3
Technical Information Report
1. PROJECT DESCRIPTION
Renton, Washington
J>w_f,,I,irmHI s~n.;,-(' lrrJu_,.,,.;.,,, Im:
l:.~gii:ari11/? • (',111,·11.'1111): • J<".0111.~
.fun, l.:311/r,
p,.1_1;, r.-,1:
PSI understands the site improvements will consist of a new single story retail facility and expanded
parking. Based on pr-eliminary structural information provided and previous experience with similar
projects, we anticipate column and wall loads be on the order of 30 kips and 3 kips per foot, respectively.
We also anticipate design floor loads of about 125 psf wilh a maximum concentrated load of 8 kips.
2. SITE DESCRIPTION
2.1. General
The proposed site is located at 17808 108th Ave SE in Renton, Washington. Based on readily available
aerial images the site presently has a sing!e story building, which we understand will be razed prior lo
construction. The remainder of the site has sporadic landscaped shrubbery and paved parking. The site
is bordered to the west by 108:11 Ave SE (State Route 515), ta the east by 109111 Ave SE, and to the north
and south by existing developments.
2.2. Topography
Our review of available topographic information indicates that the proposed site is relatively flat with
elevations ranging from approximately EL400 to EL410 from east to west over a distance of approxima.tely
300 feet, based on available aerial Imagery on Google Earth.
2.3. Geology
Based on a review of the geology of the region utilizing the Washington Department of Natural Recourses
Interactive Geologic Map (WDNRIGM), PSI observed that this area is mapped as Quaternary glacial till.
Glacial tJII is typically silts sand and gravels that have been overridden by a glacier and are thereby heavily
over-consolidated.
2.4. Seismic Design Values
The nearest mapped fault zone to the site is the Seattle Fault Zone approximately 5 miles northwest of the
site. The Seattle Fault Zone is mapped as a Holocene age thrust faults that trend east to west with a
reported slip rate of 02 to 1 mm per year (Reference 2).
The contribution of potential earthquake-induced ground motion from known sources is included in the
probabilistic ground motion maps published by the USGS. Design data regarding seismic site
characterization and design recommendations based on USGS mapping and analysis are implemented in
the 2012 Jnternational Building Code. Based on the SPT data collected during our drilling, the site
conforms to the characteristics of Site Class C. The published design ground motion values, based on the
USGS Seismic Design Maps (Reference 3), corresponding to a risk-targeted 2 percent probability of
exceectance in 50 years at the project site. Seismic design values for the project slte are provided in Table
1 below.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report
f'm·,,•,m,· /lrJ.td Stm,·
I ·srJ,\' fW(' .h~· SE. !<,,nmn. W(1,l,m~t,,11
!'.'if f'r.,jn/ ,\"p 11?/:!13~5
Table 1: Ground Motion Values"'
MaJ>ped MCE Adjusted MCE
Period S1>ectral Site Speclral
(sec) Response Coefficients Response
Acceleration Acceleration
(g) (g)
0.2 S, 1.395 F, 1.000 S1.1.s 1.392
1.0 S, 0.519 F, 1.300 SM1 0.674
Renton, Washington
l'mfr . ..._-i,,11<1t Sn,·iH lm/11~,n'n, Jr,c.
E,,gii,rai,ig • C,mnrhm![ • Tnli"f<
Ju11, / . .!Ill/,
A,.,;:,·.'"('
Design
Spectral
Response
Acceleration
(g)
So, 0.928
So, 0.450 . ' Risi,; TarJeted 21'b Probabiirry of E:,.coodance m 50 years for labtude 47.44309 11nd Long;t(Jdc ·122.19636
2.5. Subsurface conditions
Subsurface materials and conditions were investigated with nine hollow-stem auger borings performed on
May 161h, 2016. The nine borings were drilled to a depth of approximately 11 to 21 feet below the ground
surface. The approximate locations of the soil borings are shown on Figure 2. In general, the soils under
the proposed building areas generally consist of loose to medium dense silty sands fill soils over medium
dense to very dense glacial till soils. A description of our field investigation, and our boring logs, are
available in Appendix A. A description of the laboratory testing program along with sample test results are
avaHable in Appendix 8. The terms used to describe material encountered in the boring are defined in the
General Notes. A description of the soils as they were encountered from the ground surface is provided
below.
1. FILL: The fill generally consisted of silty sands. The flll was observed in all borings. N-Values in
the silty sand fill soils ranged from 3 to 25 blows per foot to indicate relative densities of loose to medium
dense. Moisture contents of the fill soils range from 15 percent to 20 percent.
2. WEATHERED TILL: The weathered till deposits consisted of light brown to dark brown with orange
mottling, silty sand and silt with sand soils. Weathered till was observed in aH borings. N-Values ranged
from 22 to 72 blows per foot in the silty sand soils to lndicate relative densities of medium dense to very
dense. Moisture contents in the silty sand soils range from 13 percent to 18 percent.
3. TILL: The till deposits consisted of gray silty sand soils and were observed in all borings except
B-1 and B-2. N-Va!ues ranged from 50 blows for 2 inches to 50 blows for 6 inches to indicate a relative
density of very dense. Moisture contents of the till range from 9 percent to 20 percent.
2.6. Groundwater
Static groundwater was not encountered at the boring locations at the time of ourfreld investigation: however,
PSI believes that small amounts of perched water was observed in borings 8-3 and B-4. This perched water
was observed within sand lenses within the till soils and may be present in other portions of the site seasonally
or after significant precipitation events.
3. CONCLUSIONS AND RECOMMENDATIONS
3.1. General
Subsurface explorations for this investigation indicate the presence of as much as 3% to 51h feet of fill overlying
glacially consolidated soils across the entire site. It is PSl's opinion that the onsite soils are suitable to support
conventional spread footings provided the recommendations stated below are followed.
PACLAND Project #10507003
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3.2. Site Preparation
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We anticipate that the removal of existing structutes, foundations and utilities will likely disturb the upper 31h to
5% feet of sorls in the northern portion of the site. Any large debris encountered below proposed new buildings
should be removed.
3.3. Structural Fill
All fill placed beneath foundation elements, sidewalk, and pavement areas should be placed as ccrnpacted
structural fill. We recommend that structural fill extends at least 2 feet beyond building and pavement !imits
where nearby structures do not restrict fill placement. On-site soils, in lieu of organic matters or other
deleterious materials can be reused tor backfill purposes, provided the material can obtain moisture
contents that will allow it to meet compaction requirements. Imported material, if required, should be
approved by the geotechnical engineer. Compacted fill should be placed in 12-inch-thick lifts (loose) by
heavy compactors such as large vibratory rollers and hoe&packs and in 6 inch loose lists for smaller
compactors such as small plate compactors and jumping jacks. These soil should be moisture-conditioned
to within 2 percent of the optimum moisture contenl, and compacted to a density of 95°/a of the maximum
dry density as determined by ASTM D 1557.
The condition of the subgrade should be evaluated by a PSI representative before fill placement or
construction begins. Fill compaction should be evaluated by in-place density tests performed during fill
placement so that adequacy of soil compaction efforts rnay be evaluated as earthwork progresses. When
fill material is inconsistent or when more than 30% of the fill material is retained on a 3/.i inch sieve, fill
placement should be observed and compaction evaluated by observation of a proof-roll using a loaded
tandem axle dump truck.
lf Imported fill materials area required PSI recommends they consist of granular material such as pit-run
or quarry-run rock, crushed rock, crushed gravel, or sand. They should be fairly well-graded between
coarse and fine material with a maximum particle size of 2 inches and should have less than 5 percent by
weight passing the U.S. Standard No. 200 Sieve.
3.4. Utility Trench Excavations and Backfill
Excavations should be made In accordance with applicable Federal and State Occupational Safety and
Health Administration regulations. Utility trenches in the near surface sand soils at the site will need to be
sloped, or shored from the ground surface due to the potential for caving, Actual inclinations will ultimately
depend on the soil conditions encountered during earthwork. While we may provide certain approaches
for trench excavations, the contractor should be responsible for selecting the excavation technique,
monitoring the trench excavations for safety, and providing shoring, as required, to protect personnel and
adjacent improvements. The information provided below is for use by the owner and engineer and should
not be interpreted lo mean that PSI is assuming responsibility for the contractor's actions or site safety.
The fill and soft silty soils PSI encountered onsite should be considered Type C soils. Dense or hard native
soils can be classified as Type B soil according to the most recent OSHA regulations. In our opinion.
excavations should be safely sloped or shored. The contractor should be aware that excavation and
shoring should conform to the requirements specified in the applicable local. state. and federal safety
regulations, such as OSHA Health and Safety Standards for Excavations, 29 CFR Part 1926, or successor
regulations. We understand that such regulations are being strictly enforced, and if not followed, the
contractor may be liable for substantial penalties.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
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Excavation and construction operations may expose the on-site soils to inclement weather conditions. The
stability of exposed soils may deteriorate due lo a change in moisture content or the action of heavy or
repeated construction traffic. Accordingly, foundation and pavement area excavations should be protected
from the elements and from the action of repelilive or heavy construction loadings.
Utilities trenches within the building, pavement. and sidewalk areas should be backfilled with structural fill
and compacted in accordance with the recommendation in section 3.3 of this report with the exception of
fill soils placed immediately around and above the first foot vertically around utility lines which should be
compacted to at least 90% of the maximum dry density as determined by ASTM D 1557. Compaction by
jetting or flooding should not be permitted.
3.5. Foundations
PSI has provided two options for the potential foundation subgrade preparation which are listed below.
Option 1:
Footing subgrades should be over-excavated a minimum of two feet and have the soil in the base of the
trenches compacted to a finn and unyielding state as determined by the geotechntcal engineer, then the
removed soil should either be recompacted as structural fill back into the over-excavated area or should
replaced with imported structural fill, place in accordance with the recommendations in Section 3.3 of thfS
report. The over-excavation and backfill areas should extend at least 2 feet beyond lhe edge of the footings
or a distance equivalent to the depth of the over-excavatfon, whichever is greater. Provided these foundation
subgrades are prepared in this way the building may be supported by shallow spread footings with an
allowable bearing pressure of up to 3,000 p()unds per square foot (psi). This value applies to the total of dead
load and/or frequently applied live load and can be increased by one-third for the total of all loads; dead, live
and wind or seismic.
Option 2:
Footing may be excavated extending to dense native glacial till sails that were observed from 3Y.i to SYi feet
below existing site grades. Footings extending down to these dense native soils may be designed With an
allowable bearing capacity of 5.000 psi. This value applies to the total of dead load and/or frequently applied
live load and can be increased by one-third for the total of all loads; dead, live and wind or seismic.
Regardless of the option ~ected All footings should have a minimum 18 inches of embedment below the
lowest adjacent final grade for frost protection and all footing subgrades should be prepared in the same
manner across the site. Perimeter and spread footing should be at least 18 inches and 24 inches wide
respectively.
Horizontal forces can be resisted partially Of completely by frictional forces developed between the base of the
spread footings. The total shearing resistance between the foundation footprint and the soil should be taken
as the normal force. i.e., the sum of all vertical forces (dead load plus real live load) times the coefficient of
friction between the soil and the base of the footing. We recommend assuming an ultimate coefficient of friction
value of O .30 for design. If additional lateral resistance is required, passive earth pressures against embedded
footings or walls can be computed using a pressure based on an equivalent fluid with a unit weight of 250
pounds per cubic foot. This value assumes that backfill around footings will be placed as granular structural
fill.
PACLAND Project #10507003
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3.6. Settlement
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The building foundation loads, and floor live loads will all cause settlement due to consolidation, or compression,
of the underlying soils. The subsurface Information and laboratory test data developed for this study was used
to estimate settlement beneath these loads. We have assumed that the maximum wall and column loads will
be 3 kips per foot and 30 kips for the purpose of this analyses on both foundation options.
We estimate that the sett1ement of a typically loaded, isolated column footing designed in accordance with our
previously recommended allowable bearing pressure of 5,000 psf on dense native soil will be less than 1 inch,
additionally we estimate that settlement for 3,000 psf footings, founded on 2 feet of structural fill, will be less
than 1 inch. These eslimates assume that the load on the footings are real dead load and sustalne-d or long~
term live load. Lesser actual bearing pressures will produce less settlement. Some differential settlement
between footings should be expected due to differences in their size and loading conditions and the variability
in subsurface conditions across the buildtng footprint. Differential settlements are difficult to quantify; however,
we anticipate they will likely be limited to less than about one half of the total settlement or less than }S inch for
both foundation options along a 40-foot span. Settlement of the footings is also expected to occur rapidly,
essentially as the new structural loads are placed and shortly thereafter. Footing settlements will 08 in addition
to areal settlements due to floor live, or storage loads. For this reason, we recommend that floors, walls and
columns be desfgned ta move independenUy of each other.
3.7. Floor Support
PSI recommends that soil subgrades below the slab be compacted to a firm and unylelding state.
Compaction of in these areas should be confirmed with a proof rolled with a loaded tandem axe! dump
truck, or be observed by the geotechnical engineer or their representative to be firm and unyielding. We
further recommend the installation of a 6-inch thick granular base course beneath the floor slab to provide
uniform support and a capillary break between the slab and the subgrade soil. The base course should
consist of crushed rock with particles no larger than 1 •inch size and having less than about 2% passing
the No. 200 sieve {washed analysis). Crushed rock"% to Y-i inch gradation is often used for this purpose.
The base course material should be installed in a single lift and compacted to at least 95% of the maximum
density as determined by ASTM D 1557 or to a firm and unyie!dlng state. In our opinion. it is appropriate
to assume a coefficient of subgrade reaction, k, of 250 pound per cubic inch for the design of floor stabs
constructed as recommended above, It may also be appropriate to install a vapoMetarding membrane
beneath slabs that will receive floor coverings or will be used to store moisture-sensitive materials. The
membrane should be installed in accordance with manufacturer's recommendations.
3.8. Drainage
We recommend footing drains be placed around the exterior of the building foundation to reduce the potential
for lateral migration of moisture into the building envelope. We recommend that all roof drains be connected
to a tighl~ine pipe leading to storm drain facilities. Pavement surfaces and open space areas should be sloped
such that surface water runoff is collected and routed to suitable discharge points. We also recommend that
ground surfaces adjacent to buildings be sloped to facilitate positive drainage away from the buildings.
3.9. Pavement
For automobile parking areas founded on silty sand fill soil, we recommend a pavement section consisting
of 2% inches of asphaltic concrete (AC} over 4 inches of crushed rock base (CRB) or 4 inches of Portland
Cement Concrete (PCC) over 4 inches of crushed rock base. If semi-trucks, or other heavy equipment is
PACLAND Project #10507003
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expected on paved areas. the pavement section should consist of 4 inches of AC over 6 inches of CRB or
5 inches of PCC over 6 inches of CRB.
These preliminary pavement sections are based on a pavement design using the site sand subgrade, a
desired pavement life of 20 years, and a terminal serviceability index of 2.0. These estimates should be
revised once design traffic inforrnatlon is developed.
These recommended pavement sections are also based on the assumption that the subgrade consists of
firm, undisturbed soil or structural fill and that the pavement will be constructed during the dry summer
months. Proofrolling should be used to evaluate pavement subgrade. Any soft areas disclosed by
proofrolling will likely require over~excavation and replacement with structural filL Some contingency
should be provided for the repair of any soft areas.
Permanent. properly installed drainage is also an essential aspect of pavement design and construction.
All paved areas should have positive drainage to prevent ponding of surlace water and saturation of the
base course. This is particularly important in cut sections or at low poinls within the paved areas, such as
in sunken loading dock areas or around stom,water catch basins. Effective means to prevent saturation
of the base course including installing subdrain systems below sunken loading docks and weep holes in
the sidewalls to catch basins.
3.10. Stormwater
Based on previous experience on gladal till sites PSI does no1 believe that infiltration of site stormwater
will be practical. Glacial till soil in this region typically provide infiltration rates of less than one inch per
hour and very often less than :4 inch per hour.
4. DESIGN REVIEW AND CONSTRUCTION MONITORING
We welcome the opportunity to review and discuss construction plans and specifications as they are being
developed. We are of the opinion that to observe compliance with the design concepts, specifications,
and recommendations, construction operations dealing with earthwork and foundations should be
observed by a qualified geotechnlcal engineer. We would be please-0 to provide these services to you.
5. REPORT LIMITATIONS
The recommendations submitted in this report are based on lhe subsurface information obtained by PSI
and design details furnished by representatives of the client, Bridgestone Retail Operations LLC., for the
proposed improvements at 17808 108l1
' Avenue SE in Renton, Washington. If there are any revisions to
the plans for this project, or if deviations from the subsurface conditions noted in this report are encountered
during construction, PSI should be notified immediately to determine if changes in the foundation and/or
pavement recommendations are required. If PSI is not retained to review these changes, PSI will not be
responsible for the impact of those conditions on the project.
After the plans and specifications are more complete, PSI should be retained and provided the opportunity
to review the final design plans and specifications to verify that our engineering recommendations have
been properly incorporated into the design.
PACLAND Project #10507003
Firestone Complete Auto Care
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REFERENCES
Renton, Washington
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Reference 1: Washington Department of Natural Recourses Interactive Geologic Map.
http://www.dnr.wa.qovfresearchscience/topics/qeosciencesdata/paaes/qeology portal.aspx
Reference 2· U.S. Geological Survey, 2010. Quaternary fault and fold database for the United States,
accessed November 10, 2010, from USGS web site:http://earthguakeusqs.gov/hazards/gfaufts/.
Reference 3: USGS Seismic Design Maps. http://earthguake.usqs.gov/desiqnmapslus/application.php
PACLAND Project #10507003
Firestone Complete Auto Care
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Technical Information Report
FIGURES
VICINITY MAP
SITE EXPLORATION LOCATION MAP
Project #10507003
Renton, Washington
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LEGEND:
• • Site Location
, __ JT9Jnformation &~-• !ro Build On
Engineering, Consvlting • Testing
PACLAND
20508 56th Ave W Suite A
Lynwood, WA 98036
(425)409"2504
Technical Information Report Renton, Washington
NOTES
Site underlay provided by Google Earth
PROJl:.CT NAME.:
Firestone Relal Store
17808 1 D8th A~nue SE
Rent0t1. Washington
OESCRlf'nON;
Vicinity Map
Project #10507003
DRAWN BY:
MSP
A.P?HOVED 6Y:
MSP
DAT!;: FIGURC:
June. 2016
PSI PHOJfCl /VUM6E:-R:
07121375
Firestone Complete Auto Care
LEGEND:
~ Boring location
I ---'11' Information &11:!Jf:.-• fro Build On
Engineering • Consult,ng • Testing
PACLAND
2050B 56th Ave W Suite-A
Lynwood, WA 98036
(425) 409->504
Technical Information Report Renton, Washington
NOTES
Site underlay provided by GEi Englneedng Associates
PROJECi NAM!:.:
Firestone Retal Storo
17808 106th Avenue SE
Renton, Wash•igton
DESCRIPTION:
SIie Expbra!lon Map
Project #10507003
DRAWN BY: DATE! flGURL:
MSP June. 2016 2
APPROVED SY: PSI PH:OJECT NUMBFR:
MSP 07121375
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Zipper Geo Associates. LLC
Geotechnical and Environmental Consulting
Project No. 1688.01
29 August 2016
PACLAND
1505 Westlake Ave. N, Suite 305
Seattle, WA 98109
Attention:
Subject:
Mr. Bill Fortunato
Summary of Field Infiltration Testing
Renton Retail
17808 108 1h Avenue SE
Renton, Washington
King County Parcel No. 322305-9104
Dear Mr. Fortunato:
This report summarizes the field infiltration testing services provided by Zipper Geo Associ.:ites, LLC (ZGA)
for the proposed retail development at the above-referenced address. Our services have been provided in
general accordance with our Proposal Pl6269 dated 9 August 2016. Written authorization to proceed
with our evaluation was prnvided by PACLAND on 15 August 2016. This letter is an instrument of service
and the conclusions presented herein are in respect to the subject property and have been prepared in
accordance with generally accepted geotechnical engineering consulting practice-This letter has been
prepared for the exclusive use of PACLAND, and its agents, for specific application to the subject property
and stated purpose.
SITE LOCATION AND DESCRIPTION
The project site is a rectilinear parcel comprising approximately 1 acre of land with its long axis oriented east
to west between 109m Avenue SE and 108t~ Avenue 5£ in R:enton, King County, Washington. The western
approximately 4/Sth of the property is developed with a 2,200 square foot single-story building, occupied
by a Skipper's Seafood, with a surrounding parking lot. The eastern portion of the property is at a slightly
higher elevation and consists of a tended grass lot with scattered trees and a fence on its western edge
dividing the developed portion of the _p(lrcel from the greenspace" The site is bordered to the north and
south by developed commercial properties; to the east by 109t~ Avenue Sf and developed residential
properties beyond; and to the west by 1081
h Avenue Sf and developed commercial properties beyon,d.
Topographically, the ground surfac:e an the slte generally slopes gently downward to the west with a total
vertical relief frnm the east property boundary to the west of about 10 feet.
19023 361h Avenue West, Suite D Lynnwood, Washington 98036 (425) 582-9928
Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Zipper Geo Associates. LLC
Summary of Field Infiltration Testing
Project No. 1&88.01
29 August 2015
PROJECT DESCRIPTION
A plan provided for our review indicates that proposed development will include one building with paved
parking and vehicle access areas. ZGA was not provided with plans for the infiltration facility. You have
Indicated that the infiltration facility may be approximately 8 feet below existing grade and located north of
the proposed building location below parking areas. A proposed location for infiltration testing was outlined
on Geotech RFP bhibit l.O, issued on 26 July 2016. The test location was moved to the eastern portion of
the parcel when it was determined that the Skipper's facility was still in operation and that the initial test
tocation would impede parking and require resurfacing, The project site is illustrated on figure 1.
SCOPE OF SERVICES
The purpose of the limited geoted1nica1 engineering services described in this letter was to determine a
field-measured stromwater infiltration rate at the site by completfng one field infiltration test. Our scope
of services included the following: reviewing the King Cot1nty 2009 Surface Water Design Manual
(Manuaf) regarding stormwater infiltration testing requirements, arranging for marking of underground
utilities, completion of one infiltration test, and preparation of this report. Our scope of services did not
include addressing other geotechnical engineering aspects of the proposed site improvements.
SUBSURFACE CONDITIONS
Soil Conditions
Published geologic maps indicate that the property is underlain by glacial till. A geotechnkal report was
previously completed at the site by PSI (Geotechnical Engineering Report, Firestone Retail Store, 17808 1081"·
Ave. SE, Renton, WA) dated June l, 2016. Borings completed at the site as part of the PSI re-port indicate the
site is generally underlain by a thin laver of asphalt conc,ete pavement underlain bv about 3.5 to 5 feet of fill
consisting of very loose to medium dense, silty sand. Below the silty sand fill, the boring logs disclosed
medium dense grading to very dense silty s.and with variable gravel content (weathered glacial till grading to
unweathered glacial till}.
Our infiltration test was completed in a test pit located in the eastern, undeveloped portion of the site at the
location shown on the attached Figure 1, Site and Exploration Plan. A descrip,tive log of the subsurface
conditions observed at the infiltration test location is presented in Appendix A as test pit TP-1. Please note
that per the Manual requirnments, the soil descriptions are provided in accordance with US Department of
Agriculture nomenclature. Soils observed at the infiltration test location included approximately 4 feet of
weathered glacial till material consisting of medium dense, light brown to tan with some mcidation, sandy
Joam with grave! and some organics in the form of tree roots. The we;aithered till was underlain by
unweathered glacial till consisting of dense, tan to light brown, sandy loam with gravel. The tes.t pit was
terminated at a depth of approximately 8 feet in dense, tan, unweathered glacial tilt.
19023 36th Avenue West, Suite D Lynnwood, Washington 98036
Page2
Project #10507003
(425) 582-9928
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Zipper Geo Associates, LLC
Summary of Field lnfiltr.ition Testing
Proj-ect No. 1688.01
29 August 2016
Groundwater Conditions
No groundwater was observed during our exploration, which extended to a depth of approximately 8 feet
below existing site grade at the infiltration test location. We did not observe soil coloration mottling
suggesting that seasonal groundwater may be higher than the observed condition. PSl did not ieport
observing groundwater in their explorations, which were advanced to a depth of up to 21 feet below the
current grade of the paved portion of the property. However, PSI notes that '' ... PSI believes that small
amounts of perched water was observed in borings B-~ and B-4. This perched water was observed within
sand lenses within the till soils and may be present in other portions of the site seasonally or after significant
precipitation events." Groundwater conditions should be expected to fluctuate due to seasonal
precipitation variation, irrigation, site utilization, and other factors.
INFILTRATION TESTING RESULTS
A single small-scale Pilot Infiltration Test \PIT) was completed at a depth of approximately 8 feet below
existing site grade in general accordance with the procedures described in the Manual. The approximate
test location is illustrated on Figure 1. Based on the results of our testing, the field-measured infiltration
rate w<1s determined to be approximately 0.21 inches per hour. For design, corrections {or reductions.) to
the measured infiltration rate should be made for testing, geometry, and plugging pN the Mcmua/ to
arrive at a design infiltration rate.
CLOSURE
We trust that this letter meets your current needs. Please do not hesitate to contact us should you tiave
any questions.
RespectfLJ!ly sLJbmitted,
lipper Geo Associates, LLC
Robert A. Ross, f>.£.
Principal
Enclosures: Figure 1-Site and Exploration Plan
Appendix A-Field Tes.ting Procedures and Log
19023 36lh Avenue West, Sutt:e D Lynnwood, Washington 98036
Page 3
Project #10507003
{425) 582-9928
Firestone Complete Auto Care Technical Information Report
PACLAND Project #10507003
Renton, Washington
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Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix G -Bond Quantities Worksheet
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Projeet Nama:
Location:
Clearing greater than or equal to 5,000 board feet of timber?
yes
If yes,
Forest Practice Permit Number:
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Bond Quantities Worksheet 2015 (4}.xlsx
no
For alternate formats, call 206-296-6600.
Date:
ProJeet No.:
Activity No.:
Note: All prices inc1u9e labor, equipment materials, overhead and
profit. Prices are from RS Means data adjusted for the Seattle area
or from local sources if not included in the RS Means database.
Unit prices updated: 3!2f2015
Version. 3f2/2015
Report Date: 6/21/2016
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H•""roseediniT ESC-8 SWDM 5.4.2.4
Jute Me&h ESC-9 SWDM 5.4.2.2
Mulch, bv hand, straw, 3~ deeo ESC-10 SWDM 5.4.2.1
Mulch, bv m.;ar;:hino, straw. 2-dean ESC-11 SWDM 5.4.2.1
Pipino, temporarv, CPP, 6~ ESC-12
Pininn, tsm--ranr, CPP. a~ ESC~13
Pipino, temDorarv, CPP, 12~ ESC-14
Plastic co11ering, 6mm thick, sandbaaaed ESC·15 SWDM 5.4.2.3
Rip Rap. machine placed; slopes ESC·16 WSDOT 9-13.112)
Rock Conslruct1on Entrance. 50')C"15'x1' ESC-17 SWDM 5.4-4.1
Rock Construction Enlrance. 100'x15'x1' ESC-13 SWOM 5.4.4.1
Sediment oond riser as.sembl" ESC-19 SWOM 5.4.5.2
Sediment tran, S' hinh berm ESC-20 SWDM 5.4.5.1
Sed. trap. 5' hrDh, riprapned spi!lway berm section ESC•21 SWOM5.4.5.1
Seedinn, hand ESC-22 SVVDM 5.4.2.4
Soddlno, 1~ deer., level ciround ESC-23 SWDM 5.4.2 .5
Soddina, 1~ deep, sJ~ed-;;.round ESC-24 SWDMS.4.2.5
TESC Sunervisor ESC-2S
Water truck dust control ESC-2U SWDM5.4.7
WRITE'iN'-ITEMS••••"•; , :1de1a1:r1~;::£P: '.lfiJ:!;>.1t~:'. i'/ft?'S'.k;~'v"iz'kt;.,W;'}!t,~j
Page 2 of9
Bond Quantities Worksheet 2015 (4).x:lsx
$ 6.00 CY
$ 80.00 Each
$ 95.00 CY
$ 9.00 CY
$ 2.00 CY
$ 1.50 LF
$ 1.50 LF
s 0.80 SY
s 3.50 SY
s 2.50 SY
$ 2.00 SY
$ 12.00 LF
s 14.00 LF
$ 18.00 LF
s 4.<JO SY
$ 45.00 CY
$ 1,800.00 Each
$ 3,200.DO Each
$ 2,200.00 Each
$ 19.00 LF
$ 70.00 LF
$ 1.00 SY
$ 8.00 SY
$ 10.00 SY
$ 110.00 HR
$ 140.00 HR
~,·~i'iil'!i>\): f:"'fil,;,:,:t"§ctl;• ;:.·-/:
E;;ich
I
I
Esc susrorAt.=
30% CONTINGENCY & MOBILIZATION:
ESC TOTAL:
COLUMN:
.·:· .· ' .
$
$ s
A
Unit prices updated: 31212015
Version: 31212015
Report Date: 6/21/2016
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Site Improvement Bond Quantity Worksheet
Unit Pri<:e
GENERAL ITEMS Nn.
Backf1II & Cu111.,acirtin• embankmer,t Gl-1 • 6.00
e.11c1o;rn; & Cornpae?i:m-trench Gl-2 s 9.0D
C,il oril1etncve Rrush. bv t'land Gl-3 ' 1.00
Ch.iori=,'Grubbirv'I/Troe Removal Gl-4 $10.0(X].00
EJ:cw1oti<m . bi.:lk Gl-5 • 2.00
Excavation -Trench Gl-6 $ 5.00
F.incmn. cedar. 6' htJlh GI-7 • 20.00
Fencin:1, ci1ain hnll.. vim1I co~ted, 6' lllllh Gl-8 • 20.CO
Fencir:g, chain linloc., n11te, vinyi o:iatod, 2 Gl-9 $ 1,400.00
r-encir.g. sn'1t rail. 3' high Gl-10 ' 15.00
Fill & c.o,np.ict • common b;mow Gl-11 ' 25.00
Fil, & comoac: -"ravr.l bas.ii Gl-12 ' 27 00
1-iU & ccm:i..1ci -screen~d toosoil Gl-1:'.l ' 39 00
G~ll,on, \2~ deep, s1ane fined mesh Gl-14 5 65.00
GaD1c11. 1s·dnco, stone filled m!$h Gi-15 s !}(LOO
Gab100. 36"deen, s1ono filled mesh Gi-16 ' 150,00
Grnding. fine. !Jv t",a11C Gt-17 ' 2.50
Grad'nri. fir,e, wilh nrader GI ·1B $ 2.00
r·/o:iume,'115, J' long GI 19 '
25D.OO
Sem;.it1v-fl Areas SH1n G!-20 $ 7.{]0
Soddin·;r. 1" dee". sloued arour;d G!-21 • 8.00
Sur,,eyir.,g. tnti & r1rade Gl-ZZ $ (150.00
S.ir•li! ·c-. lD1 loc.;ition/llnes Gl-23 S 1,800.00
"'."r<1ffi,:; (:.::;mrai crew ( :2 n;,.goers) 01-24 ' 120.00
7rail, 4." chivnad w(;(ld Gl-25 S 8.00
I rail, 4" crush~d cinder G!-26 ' 9.DO
I rail, 4" t.:p c::;iurse Gl-27 ' 12.00
V</n!I. rclainin~, concrote GI -2B ' 55.00
Wn:1. rocJ,;ery Gl-29 s 15.00
P;.igtJ 3 of9 $U8rDTAL
"KCC 27A aulllorlzes only one btmd reduction.
Bend Quantibe!> \Nor: .... s.hem 2015 {4).xls.x
.. ., . .. .-.. ""' '' "" -__ _. .. .
Exititll'lSJI Futuro Public
Right.of-Way Right of W.ay
& Oraln.it:ieo Fa11;:il!tias
Unit Quan! Cosl OU!li'll Cos, a1.1ant.
CY
CY
SY
Aoce
CY
CY
LF
l.F
E,oh
LF
CY
CY
CY
SY
SY
SY
SY
SY
''"' Eac.'l
SY
Do• -HR
SY
SY
SY
SF
SF
\fl/¢1) ~ale D4.'D312~15
.. . ..
Priv;i.ta
lmprov&m11onts
Cost
Uni! prices vpdated. 03/0212015
Version: 03/0212015
Repoi1 Date: 6/2i/2015
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Site Improvement Bond Quantity Worksheet
I Unit Prk:e
ROAr 111.11 pRnVEMENT Nn
AC Grindi•"'', 4'Wid~madline.; 100&v Rl-1 s 30.00
AC Grindll'lr'l, 4' wide macliine 1000-2000 A:1-:2 $ 16.00
AC Grindi....,, 4' Wide machine> 2001~ Rl-3 • 10.00
AC Removal/Disoosal Rl-.4 • 35.00
ea.mc.ade.~0 111 t Permanent} Rl-,S • 58.00
Curb & Guflar, i.:,llad Rl-7 s 17,00
Curb & Gutter, vertical RI-B-$ 12.50
Curb atid Gutter, demolition Ofld disnosal Rl-9 $ 1a.oo
Curb. l:!xtrudl!d as '" Rl-10 $ 5.50
CLJib. extruded concrete RI -11 $ 7.00
Sawcut, ar .. a!t., 3~ de.,tti Rl-12 $ i.85
Sawcut, concrete. oor 1· denth RI· t3 $ 3.00
Saalani, .asnhal1 Rl-14 • 2.00
Shoulder. AC, ( .soe AC road unit nrice, Rld5 $ -
Shoulder, "'r,11vel, 4" 1/llck Rf-16 s 15.00
Sidewalk, 4" thjck Rl-17 s 38.00
Sid-lk, 4" thic.k, dP.mornion ;md diU10t;~ Rl-18 S 32.00
Sidnwalk. 5" thic.k. Rl-19 ' 41.00
Sidemlk, 5'' thick der'!".olillon and ciispo$f Rl-20 s 40.00
Sinn, 11andica" Rl-21 ' 6S.OO
st.i-...i ...... , ... c, stali R!-22 ' 1.00
Strfol""", U,ermot:1lag;Uc, f for crosswalk.) Rl-23 • 3.00
S!rip,ir,.g, 4" refleciorized line Rl-24 • 0.50
Page4of9 SUBTOTAL
·Kee 27A l'l!Jlhorizes <mly OM bo11d rOOuction.
Bcmd Quantities Works.hae! 2015 (4).xlsx
Exiirting Futom Public
Right.of..w.ay Rigbt ofWa,'
& Dralnano Fac.ilitro$
Unit OUBflt. I Cost Quant. I CMl Qua!lt. I
SY
SY
SY
"' LF
lF
lF
LF
lF
LI'
LF
lF
lF
"' SY
SY
SY
"' SY
Eaot,
''"' SF
lF
Wo'Jda1e: 0,10:-,;;:::·.r,
Private,
lmprD\1911'1~nts
cost
Unit prices updated: 03102/2015
Version: 03.'02i2C15
Report Date: 6f21f2016
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Site Improvement Bond Quantity Worksheet 'N,;:0 da:I;!: :J4J:n.1.201 ~
I t)rut PriCt'.I
ROAD SURFACING Nn.
Al!tld1onal 2.5'' Crushed Surfacmo RS-1 ' >tl<l
!-J.,!A i/2" Overlav 1 S' RS-2 $ 14.00
HMA 112"' Ow.'rlav 2· RS-3 • IB.00
HMA Ro.:IO. :r. 4" rock. F1~t 2500 SY RS-4 ' 2B.OO
JcMARoad 2".4"rcck.O'tV.OYer2500S, RS-5 $ 21.00
HMA Roo1d. J.". 9112" Hoo:, First 2500 S RS-6 ' 42.00
HMA Road. 3", 9112" Roe.,;, 0Ly0;&r25C RS-7 • 35.00
Net ;_faed RS" f!.
Ne! :Jscd RS-!;
HMA Road. 6" (Aip:h. First 2500 SY RS-11 ' 33.10
H\olA Road, IJ" Dt'lpth. Ctv. Over 2500 SY RS-11 ' 30.00
HMA :!-1'4" or 1 ", 4" Depth RS-12 $ 20.00
Gnwel Roari. 4" rocl<., Firs( 25(]0 SY RS -13 ' 15.00
Gr;ivcl Road. 4" rock. OLv. over 2500 SY R$-l4 ' 10.00
PCC Ro.:ic (AC!d Uncl~r Write•lns wiDes~ RS-15
Thicken>1d Edge RS-17 S 6.60
P;i~e5;-if9
·Kc:c: 27A .iulhonzcs only one iloml 1eduction.
Bon~ Quanti'.ie~ \.Vorksheet 2015 (4).xl~x
SUBTOTAL.
Existing
Rlght-of-way
Unit Quant. I c~,
M" Reck"' 2.6 base & 1.5" to
SY
SY
SY
SY
SY
SY
SY
SY
SY
SY
SY
SY
LF
Futuro PubHc Private
Right ofWay Jmprov~m1mts
& Orainagq F.-i;il!ties
Quar,t_ I Cost Quant I Cos1
course 9 112" Rock= 8'' oas,a & 1 S' too course)
Un1tpri:::es updated: 03/0212015
Version:-0310212015
Report Date: 8/2112016
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Site Improvement Bond Quantity Worksheet Web datu: -:4,'C~i:'201 'I
Existing FJ.ltl.l~~ Public. Private
Right.of-way Right of Way lmprovemonts
& Draim100 F.ac:ilitil!'S
I Unrt Price Unit Quant. I Cos: Quant. l Cost Quant. I ""''
DRAINAGE: (CPP"' ComJ1:1<1tei:f P1.i$tic Pip!!, N12 cr!:qulvolent) For Culvert mlces, AveraaG of 4' cover was assumed. Assume nerlorated PVC is same crice as solid pipe
Access Rc-ad, AID D-1 1 $ 2LOO SY I I
Bollards • fixec:I I D -2 I $ -240.74 I Each I I I
0oliards -removoble I D -.3 I $ 452.M I Each I I
• ,cas inciudne framci, ,md lid\
ca f'lll'le! D-• $ 1,500.00 Each
CB Tvne IL o-, S 1,750.00 .. ,,,,
CB T···-U, 4£" diameter o-, $ 2,300.00 Eoch
for .iddl!lonal deoth over 4' D-7 $ 480.00 FT
CB T··--ll, 54~ dlame!Cf o-, $ 2,500.00 Ea<:h
for add/lional deoth over 4' D-9 $ 495.00 FT
CBT II, 80"diamoler 0 -10 5 2,800.00 Each
fOf 8dditi1;1nal d!!:oih o~r 4' D -11 • 600.00 FT
CBT•~e II, 72"dibmeler 0-12 :S 3,600 00 Each
for additional depth over 4' D • 13 • 850.00 FT
Throu"h-curb Inlet Framework iAddJ D -14 • 400.DO Each
Cloanool. PVC. 4" D-15 • 150.00 Each
Cleanout, PVC, 6" 0-16 s 170.00 Each
Cleanoul, PVC, 8" 0-17 s 200.00 Each
Culvert, PVC. 4" D-18. • 10.00 LF
C1,1lverl, PVC, G" 0"1& • 13.00 LF
Ctilvert PVC, S" 0·20 ' 15.00 LF
Culvert. PVC, 12" 0-21 • 23.00 LF
C-ulvert CMP e,~ 0-22 • 19.00 LF
Ci.llll~rt. CMP. 12~ 0-23 $ 29.00 LF
Culvert, CMP. 15~ D •24 • 35.00 LF
Cl.lNert CMP, 1e· D • 25 • 41.00 LF
Clllllert. CM?. 24~ D-26 $ 56.00 LF
ci.mert. CM?, 3D~ 0-27 • 78.00 LF
CuNcrt, CMP. 36" D-:28 $ 130.00 CF
Culvert, CMP, 4B" 0-29 • 190.00 LF
C1Jlvert, CMP, 60" D-JO • 270.00 LF
C1.11'.rert CMP, 72" D -31 • 350.00 LF
P!lge£.of9 SUBTOTAL
Unit prices updated: 03/02/2015
'KCC 27A auttwrlzes only one born!' rech:ction. Version: 03{02/2015
Bond Quantities Worksheet 2015 (4).xl$X Report Date: 6/21i201G
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DRAINAGE CONTINUED
No.
Cu.v~r:. Concre1a. 8" 0-32
Culver: Concrelll. 12' D-33
Culvt'r: Concrete, 15~ 0-34
Cl\llvel'! Com:rclo, 18" D-35
CulvErl ConCf(!!O, 24~ 0-36
C1.J!vcrt Concrete. io~ D-31
curvert CMr.r1Jt!i, w~ D · 38
Culvert. Concre1e.42~ D-39
Culv;;.·rt Concrete 48~ 0-40
Cu!vert CP?. 6· D-41
curvi.rt. CPP e· D-42
Cul~ert c~P.12" 0-4:!,
C,Jiv?.it CPI" 1 !i" D-44
C,1lvart, C?P. 18" D-4&
CtilVB-11 C?P, 24' D-46
Culvert. CPP. :10" D-47
Culv1.nl. Cr'P, 36" 0-48
Ditchi1XJ 0-49
Fltiw Dispersal Trencli 11,436 ba:.""") 0-50
f'rcnctl Drain (3' Oep\tl) D-51
Gc-Dlcxliie. laid h'l ire11ch, pclypronvlene D-52
Mid-tarlk. Across i{lsor, 46" dia, 6' deep D-54
Po;1d Over110'1'1 Snillwav 0-5~
Ras!ridor/Cil Seoarat-or, 12" D-56
ReG1m:1or/C1I Scoar.it:ir, 15" D-57
Res1rir;1or:01I Sep.ir.iJQr, 1B"' D-58
Hi[n:ip, t:ilaceo. D-59
Tor,~ fnd Reduc.E!r (3B" d1.imet@r"i D-60
Trash .=i.ac:k. 12-D, 61
f1asl1 R~ck 1s· D-62
1raM Rae~ 18" 0-63
Trasn R~ck. 21'' D-"4
P.;1ac7of9
'KCC l.1A allllmnzes ori..'y one bond reduction.
Bn:id Ou,mMrn:. Wor'11.sfa1el 201.5 {4).xl!;.):
Site Improvement Bond Quantity Worksheet
Exlstin!;J Fulln''l'I Public
Right-of-way Right cf Way
& Dralnaoc-Facilities
Umtf'rica Unit Quant. Cost Quan! Co~t Quan:
• 25.00 LF
' 3&.00 " • 42.00 LF
' 48.00 LF
' 7B.00 " $ 125 00 LF
' 150.00 LF
' 175.00 LF
' 205 00 LF • 1400 Le • 16.00 LF
' 24.00 LF • 35.00 LF • 41.00 LF
s 56.00 LF • 76.00 LF
s t30.00 LF
s 9.50 CY
$ 26.00 LF
$ 26.00 LF
s 3.00 SY
S 2,000.00 Each
$ 10.00 SY
S 1,150.00 Each
S 1,350.00 E.ic:h
S 1,700.00 Each
s 42 00 CY
S 1.200 00 Each
' 3-50.00 Eat:h
' 410.00 Ea¢h
' 4.!I0.00 Eoch
' 5.50.00 Each
SUBTOTAL
Wub 0::11tu: C4103.'2015
Private
!mprovem-8-/\t$
Cost
U11it pricss updatad. 03/0212:J 15
Vers:on: 03/02/2015
Report Date-6i'21!2016
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Site Improvement Bond Quantity Worksheet Wab j,1te· o,i10J;;:u1-5
I Unit Prico Unit
PARKIN" L ~T SURFACING
•••
2w AC, 2n ton ¢~ur1:1,e rock & 4" borrow PL-1 • 21.00 "' 2"AC. 1.5" toncxmrse&2.5"basecou"' PL-2 • 28.00 SY
4" :select borrow Pl-3 $ 5.00 SY
1.,S~ 1op ccurse rock & 2.s• base cour..e PL-4 $ 14.00 SY
UTILITY POLES & ST "G
Utllih• Pole's' Relocation I UP-1 I Lumo Sum I
S1tHt li"'hl P<lles wllumlnaires I l.,IP-2 I S 7,500.00 t Each I
.,.._,.,.,TE-IN-ITEMS
Sucli as det(lnllon~ter "Uallh, vault!,.' ~
Slormwater Vault
Block W.ill
Yard Drain
Pl'ilge8of9
Wl-1 -Each
"' -2 ' 1G.OO SY
Wl<J. $ 225.00 CY
Wl-4 LF
Wl-5 FT
WI ' WI· 7
w, ••
Wl•9
WI• 10
SUBTOTAL
SUBTOTAL (SUM AI.L PAGES):
30% CONTINGENCY & MOBlUZATION:
GRANDTOTAL;
COLUMN:
'KCC 27A authorizes only cne bond red1JcU011.
&ln(S Quantities Worksheet .!015 (4).:icl5:ic
E;a:lc.ting FutuN Publlc Priv;it.0
Right-of.way RfghtofW.iy lmprovemants
& Oraina"'e Facl/ltio,
Quant Price -auam 1 coi;t Quant, I Co~! .
Not To Be Used For Roads Or Shoulders
NA NA
NA NA
NA NA
NA NA
Utilit" "ole relocation costs must be ao::omnanled bv Franchise utility's Cost Estimate
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Unit prices updated. 03/02/2015
Version: Q3/0212015
Report Date: 6/2"! 1201G
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Site Improvement Bond Quantity Worksheet Web date: 04i':J3:'20'.5
Original bond computations prepared by:
Name:
PE Re9lstraHon Number:
Firm Name;
Add«iss;
Dato: ___________ _
Tel.#: ___________ _
Project No:
FINANCIAL GUARANTEE REQUIREMENTS
PERFORJAANCE BOND'
AMOUNT
Stabilization/Erosion Sediment Control (E:SC) (A) _,$:..... _______ ;:__
E)(isting Righl-of-\Nay Improvements (8) _,$:..... _______ ;:__
Future Public Right of Way & Dr.airiage Facilities (C) _,$'------------
Pnvate improv~rnents (D) ...:,S:..... _______ ;:__
C alcutated 01.l<l ntity Completed
Total Right-of Way and/or Site Re$toration Bond'"/""* I (A+B) $
{F"lrst $7,500 of bond' shall be ca~fi-}
Performance Bond· Amount (A+B+C+D) = TOTAL (T) _.s ________ _
Minlmi;m is $2000.
Mam:enance/De1ect Bond" Total
MINIMUM BOND· AMOUNT
REQUIRED FOR RECORDlNG OR
TEMPORARY OCCUPANCY AT
SUBSTANTIAL COMPL,ETJON..,..
T x 0.30~$ ______ _
Minimum is s2aaa.
PUBLIC ROAD & DRAINAGE:
MAINTENANCE/DEFECT BOND'
(8+C) X
0.25 = ....::_S ______ _
Minimum is $2000.
NAME Q,C PERSON PREPARING BONDT REDUCTION· Dato·
• NOTE: The wor-d ·oond'' .as used rn this documer,t means ii financial guaranrne acceptable to King County.
•• NOTE: KCC 27A authonzes right of way and site ;l}Storiillon bor\ds to bo combined when both .are required
Th,c rost<1r.1ticn requirement shall include tlle tc:.al cOsl for .111 TESC as a minimum, not a maximum. In addition, corre=tivl:! work. both on-a~d off-site nee-:Js lo be inclui;!c,tl
auantities..shs.11 refiec! worse c:ase scenarios not just minimum requirements. Forexampre, if a salmonid stream may l:>e damaged. some estimated costs for restoration
r:eeds to be reflecte-1 in lhts amount. The 30% continger.cy and mot>ilization costs are computed in lhls quantity.
•-• NOTE: Per KCC 27A, totill bond amounts rema1nm~ after rei:lucitan shali not be less than 30% of the origirtal 11mour.t (1) or as re1rised by major design chang~s.
REQUIRED BOND• AMOUNTS ARE SUBJECT TO REVIEW ANO MODIFICATION BY KING COUNTY
Ptige 9 of9
Check out the DDES Web site at www.k1t1qcounty.gov/permits
Gond Quantmos lNorkshee-t 2015 (4).xlsx
Unit prices updated: 03102/2015
Version: 03/02/2015
Report Date: 6/2112016
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December 7, 2016
John and Karen Snarski
17654 109'h Ave. SE
Renton, WA 98055
1505 WESTLAKE AVE N
sum 30S
SEAnLE, WA 98109
Subject: Renton Firestone -17808108'h Ave. SE
Public Comment Letter
Mr. and Mrs. Snarski,
T 206.522 9510
F 206.522.8344
WWW.PACLAND.COM
We received the letter you sent to the City of Renton on October 21'' regarding the
proposed Firestone development located at 17808 1081h Ave. SE. We understand that you
have concerns regarding the potential impacts of the proposed development, and would
like to do what we can to alleviate those concerns.
We are sensitive to the concern you stated in your letter regarding site access, and as
such have not proposed a connection between the development and 109th Ave. SE.
Access to the proposed development will only be provided from 108'h Ave. SE, which will
prevent commercial traffic on the site from entering the residential neighborhood to the
east on 109th.
Regarding the area between the development and 109th Ave. SE, we will be providing a
30' vegetated area between the proposed parking lot and the existing 109th roadway. This
area will be landscaped and will incorporate a row of pine trees planted on the property
and additional street trees along 109th to provide visual screening between the
development and the neighborhood. Furthermore, the development will be
approximately six feet below the existing 109th roadway, further limiting its visual impact.
We hope this addresses your concerns. Please see the enclosed landscape and site plans
for additional reference. If you are satisfied with the above explanations, please notify
Matthew Herrera at the City of Renton. Otherwise, please feel free to give us a call if there
is anything in particular you would like to discuss. Thank you, and have a good day.
Sincerely,
~a~
Luke Randles
Firestone Complete Auto Care
17808 108th Ave SE
Renton, Washington, 98055
Technical Information Report
Commercial Redevelopment
1505 Westlake Ave. N
Suite 305
Seattle. WA 98109
' 'i: ! ', :., ·, ~"'.: . _--oi/y,},7
T 206.522. 9 51 0
F 206.522.8344
www.pacland.com
,: II L
Prepared By: Luke Randles, P.E.
Reviewed By: Bill Fortunato, P.E.
Prepared: September 2016
Revised: January 2017
I
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section Page
EXECUTIVE SUMMARY ........................................................................................................................................... 2
SECTION 1-PROJECT OVERVIEW ............................................................................................................................ 4
SITE LOCATION...... . ........................................................................................................................................... 9
DRAINAGE BASINS, SUBBASINS, AND SITE CHARACTERISTICS ................................................................................................ 10
SOIL.S ......................................................................................................................................................................... 11
SECTION 2-CONDITIONS AND REQUIREMENTS SUMMARY ................................................................................. 13
SECTION 3-OFF-SITE ANALYSIS ............................................................................................................................ 17
SECTION 4-FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN .......................................... 19
HYDROLOGIC ANALYSIS •.•.•.•.•.•.•.................•.....•.•...............................•.........•................................•.... , ...... ,,,,,,,,,,,,,,,,,,,, 19
EXISTING Sm HYDROLOGY .............................................................•.•...•.•.....•.•.........•.................................................... 19
DEVELOPED SITE HYDROLOGY .......................•.....•.•...•...............•................................................................................... 20
FLOW CONTROL ANALYSIS •...•...•.................................................................................................................................... 20
WATER QUALITY SYSTEM............................................................... . ......................................................... 21
SECTION 5-CONVEYANCE SYSTEM ANALYSIS AND DESIGN .................................................................................. 22
CONVEYANCE................................................................ . ...................................................•............................ 22
100-YEAR FLOOD/OVERFLOW CONDITION ...................................................................................................•...........•.•...• 22
SECTION 6-SPECIAL REPORTS AND STUDIES ........................................................................................................ 23
SECTION 7-OTHER PERMITS ................................................................................................................................ 23
SECTION 8-CSWPPP ANALYSIS AND DESIGN ........................................................................................................ 23
SECTION 9-BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT ................................ 23
SECTION 10-OPERATIONS AND MAINTENANCE MANUAL ................................................................................... 23
APPENDICES: A -EXHIBITS
B-PLANS
PACLAND
C -DESIGN CALCULATIONS
D -OPERATIONS AND MAINTENANCE MANUAL
E -WATER QUALITY DEPARTMENT OF ECOLOGY CERTIFICATION
F -GEOTECHNICAL REPORTS
G -BOND QUANTITIES WORKSHEET
Project #10439013 Page 1
'
Firestone Complete Auto Care Technical Information Report Renton, Washington
Executive Summary
The project property is located at 17808 108'h Ave SE in Renton, Washington. The site is
bordered by 108'h Ave SE/WA 515 to the west, Jiffy Lube to the north, a vacant commercial
building to the south, and 109th Ave SE to the east. There is also a residential property to the NE
as well. The site is currently developed as the Skipper's Seafood and Chowder House, which has
a building footprint of 2,552 square feet, with associated parking and landscaping. The entire lot
is approximately 0.88 acres in size. This project proposes to demolish the existing restaurant and
parking lot, then redevelop the site to become a Firestone Complete Auto Care.
The project site lies within the Lower Green River Subwatershed, which is part of the
Green/Duwamish Watershed. It is in the City of Renton Black River drainage basin.
The project site is located in the City of Renton Commercial Mixed Use Overlay District
(Community Planning area). The property is zoned CA (Commercial Arterial).
Design Criteria:
The City of Renton uses the King County Surface Water Management Design Manual
(KCSWDM), 2009 Edition, as adopted by the City of Renton and the City of Renton Amendments
to the King County Surface Water Design Manual, dated February 2010. The existing site is
developed and primarily impervious with the exception of landscape islands and an
undeveloped piece of land between the parking lot and 109th Ave SE. The proposed
development will lead to a slight increase in the amount of overall impervious area. Per the
requirements of KCSWDM, both flow control and water quality mitigation will be required as a
result of the proposed development.
Table l
Jurisdictional ReQuirements
Peak Runoff Control: Peak Rate Flow Control Standard
Matchinq Existinq Site Conditions
2-vear: Match existino site conditions
10-vear: Match existinq site conditions
100-vear: Match existino site conditions
Water Quality: Enhanced Basic WQ Treatment
Preceding detention 60% of the developed 2-year peak
flow rate
Downstream of detention The full 2-year release rate from
detention facility
PACLAND Project #10439013 Page 2
I
•
r
Firestone Complete Auto Care Technical Information Report Renton, Washington
Proposed Drainage System:
This project proposes to utilize a detention vault for storage and modular wetland system for
water quality treatment. The proposed grading will generally direct water from the northeast
corner of the site toward the west side of the site. There is currently a storm pipe that runs west
from 109th Ave SE toward the building. The existing pipe will be relocated to the north edge of
the site, and will continue to receive and detain off-site runoff from the east.
Stormwater will collect into catch basins along the valley on the east and north side of the
building and be conveyed via pipe to the northwest corner of the site to the stormwater
treatment structure. After treatment, stormwater will be directed to a detention vault, which in
conjunction with a flow control structure, will provide flow control as required by the
jurisdictional requirements identified in Table 1. After detention, stormwater will be released
existing stormwater system in 1081h Ave. SE.
PACLAND Project #10439013 Page 3
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 1-Project Overview
Figure 1 -TIR Worksheet (KCSWDM 2009)
PACLAND
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Part 1 PROJECT OWNER ANO
PROJECT ENGINEER
Pmiect Owner Real Property Investors, LLC
Phone (206) 522-9510
Add,ess 1505 Westlake Ave. N, Suite 305
Seattle, WA 98109
Project Engineer Luke Randles I
Company PACLAND ,
Phone (206) 522-9510 j
l P.1rt 3 TYPE OF PERMIT APPLICATION
0 Landuse Services
Subd:v1:-;on .' Sheri Si,bC' l UPrJ
[81 Buildirg Services
MlF i' Comrnencal / SFR
C:learing and Grndi119
Rig!at-of-Way Use
Dc,th_,.u,,_, __________ "' _____ I
I Part 2 PROJECT L0CA71DN AND =1
DESCRIPTION
Project Name Renton Firesto;;-
DDES Permit ft I
Location Towr,ship --"2"--'3N:,___ __ _
Ranne ...ec5_,E,._ ___ _
s,c,ic,n 32 (NE 1/4)
Site Address 17808 108th Ave SE
Ren1on, WA 98055
~art 4 OTHER REVIEWS AND PERMITS
i O DFW HPA LJ Sharel1ne ! 0 COE404 'u
f 1
0
~ ~~~:;,:0::;:;~
COE Wetlands @ 0t11er
Manugement
0 StrL.:ctura1
RockeryNaultl __
U E.SA Section 7
I
-P-,-,,-5--~-LAN-·~~~ ~E~-OR~~;lF~;;:,-AT-l~N ~l-
Technical Information RePort j Site Improvement Plan (En. gr. Plans)
TyPc of Drainage Review @l Targettid ! Type (circle cne). ~/ Mod1f1ed i
([~rde). Lt1·ge s.te I i ~I Site
Date (include rev1s:011 UDa!e (inc'.;Jde rcv1~:on
I dates.): --------dates): i
Li O"'"''"""oc_f ''-"-''-'"'cs'_· ------------Da'.e of Fin~l: -~ ·
j Part 6 ADJUSTMENT APPROVALS
Type (c:in:le o•ie): S1andard i Compl~x i Preapplicaiion ,I E,rpcn-r.cntal / Blanke!
Description· (include conditions in TIR Section 2)
Da!FJ of Ap~r"o"'va~I~; ---------------·-------·---·----·---------~
Project #10439013 Page4
1
Firestone Complete Auto Care Technical Information Report Renton, Washington
Kl r-.. (; ("() l \ l \ . \\' \SI i I \ (; I Or\. ',UR F •\(. r: W ,\ l 1 f{ [lf'.:.-:. I GN \:A\. l -\ l
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Part "/ MONITORING REO_U_IR_E_M_E_N_T_s ____ • _0_c_s-cr-;b_c_· =========-------·~ ·----,.
:vor:toring Req:Jired Yes ,@
Start Dale'
1 Co~pletion Date: --·-------------. ----·---I ----~-L-------------------.J
8 SITE COMMUNITY ANO DRAINAGE BASIN
Corrwiuni~y Plan: Benson Community Planning Area
Spec;al Dis:r1ct Overlays: _-C,_o,,,m,,,m,,e"r."c; ... a"-1 M,.,,,;xc-e,,d_.,U"s"'e _______________ _
orai"lilge Ba:-in: City of Renton Black River Drainage Basin
Starmwatcr Requ1rcmiJr:ts: CJty of Ranton Arn9ndments 10th,:, 2-009 King Ca1.m1ysuraco Wa:or D0s1gn Manual
~~~ 9 ONSITE AND ADJACEr<T SENSITIVE AREAS ··===··.~-·······_ I
I ::J RiveriStrearn U Steep Slope ______ _
::J Lake O Erosion Hc11:ar~
·:J Wctlarids D Lands!ide H;urm!
0 Closed Depression O Co.i; r<.·hne Ha.n1rd --------
LJ f!codp,a1n D Seismic Ha.1.:irc
CJ Ot11e, D H<Jb•:s1t Protection--------0 __ _
r········ .. ···--·-· .. ·-·---------------·-·-·-.. -·---·--
1 ?cvt 10 SOILS
--------------------
Soi I Type Slopes
P.ldcrwood Gravelly Sandy Loam Gto 15%
2
PACLAND Project #10439013 Page 5
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
KlNG cot:i,..;rY. w .. \S[Jl:·..:(il ():\. ::;t'l{f1HT \\;\ 11.U DI :-illi,'\ ri.l.\'.:llAL
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Pa,t 11 DRAINAGE DESIGN LIMITATIONS
REFERENCE;
f]l Core, 2 Offsi!e Analysis
D Se11sitive/Cd1c.af Areiis
C8J SEPA
LJ Othff
D ____ _
----"--~··· .~ "" "'" .. ·----~·-·-·-·--
0 Additional Sheets Attached
~----··------····
LIMITATION/ SITE CONSTRAINT
Port 12 TIR SUM~1ARY SHEET __ ,, (prov1oe one TIR Su'Tlmary Sheet per Thrm,ho1d Di$Chtwe Arec1)
Threshold Discharge Area·
(name or descriQtion)
Core Requirements {all B apply) --""' -·" ··--·~
l Ofsch<2rge :11 Nat--iral Lorntion Numtler ,if Natwc1t Discharge LocatiOfls: 1 '--·-' Offsite Analysis Level (0/ 2 } 3 dated:
i 1-----·--··-·-------i(j)i ---·-j Fiow Control Level: 1 3 "' Exernpt\cn Nurrrber
I find tacifirv su:mmarv sl1eet) Smail Sf!e BMPs
Conveyance System Spill containment located at·
--_,,_., ___ , ____ .,_
Erosion and SeC,rr.ent Contml--Esc· Site Supervisor: TBD
Contact Phone . -----J After Hours Pt-one:
Ma1ntenHnce ami Operation Respons,tithty: ~/ Public
If Private, Ma1ntenanr:e _LD,fLRP:£1Jirc.1· Yes !No i
' Financial Guarartees and Provided· ~i No
L1abili!v
Water Quality Type Basic Sens. lake ~ha need Basi~ i B0g · --
(include facility summary sheet) or Exernµt:c:in No
Landscape Manaqernent Plan: Cves).1 No
""" -~-··----
1--,.~ .. pecial Reciuirements fas ap~:Jic:ab!e} "-···--
Area Specific Drainage Type: CDA i SDO i MOP ,1 BP/ D .. ,fP i Shared F8c. ~~
Reou1rements Nam€: ' F IOOd p l;li r,i Floo(lwJ y Del I neatio n~--~ffl~ -,
Maior Mmor / Exemption ~ ' Type· /
~ 100 year B;,se Flood ..._lr.vc1l1rm {or range). _____ _
Datum·
Flood Pro.lcction Facilities Describe:
{c;,imm lindi.Jstric;1i landlise}
Source Cor1trul Describe landl1se; Commercial
Descnbe any structural controls: Not required
I ,; :'JJi1'J
3
Project #10439013 Page 6
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
0:1 Control -----------f-tgh.-usc Sill:;!· Yes -~,1}~;5
Treatmc-nt BMP: ----------------
Maintenance Agree'lle,11: Yes ~
w;tt, whom?
--~ q~-er Drainage Structures
Descrit:ie -~------j
'----------------------
Pan 13 EROSION AND SEDIMENT CONTROL REQUIREMENTS __ ----------------1
l\·11NIMUr..,i ESC REQUIREMENTS MiNl.'dW...-1 ESC HEUUIHEMENTS
:JlJl!ING CONSTRUCTION AFTER CONSTRUCTION
I i]J Str1bili2c EK~msr:fl Surfac:es iil Cleawig L,inits
C&J Caver Measures
l!J Penrreter Protection
[]) Tr2:f'ic Area S1abilizatio•1
I fE Sediment R!.-!lention
j !KJ Remove arid Reslore Tcrnp-s.ra~, ESC Facilities
II !I Cle<1n ord Remove Ail Silt find Debns, Ensure
Operation of Perrnane·1t FaciHties
I ::J Fl-ag l1mrts 01 SAO 8:1J open space
I
!(El Surf,.ce W,1l8t Collec!1on
D :Jew,\h•nr,g ConiroJ
D :lusl Control
D_ Flo,~ ~-ont·~I ______________ _
I D ~;:"-""" -----~·-·-·"-'' J
r.p.].,114 STORMWATER FACILITY DESCRIPTIONS (Note· Include Facility Summarv anrJ Skeic.h·l ...... -.. -··-
Flo,-.. Con~rol Tvnc-iDescriDtion
i(EJ Dctcnlion
i
Water O~~~;Y..
I]) Biclll:rat1on
j IBJ :nfiltration O VVetpocl
I W Reg·ona! racility J 0 f1..,1~dia F,lkation
:.J Shared Facility D Oil Contd
]:I Flow Con!rol O Spill Con~rol
BMPs 0 Flow Control OMPs
-_J -Olhe-r ____ J ________ ~~o __ o_,_,ie_r _____ ~_--_-_-_-_-__ -__ -_-__ -
Project #10439013 Page 7
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
TECHNICAL INFORMATION REPORT (TIR) WORKSHEET
Pmt 15 F ASEMEN'iSr'TRACTS
\--.--· -----"-"
:J Drainage E;:isemen1
:J Covenant
D Nat1~fc' Gro .... th P~otcc:t or, Cclfcnant
D Trac:
D Other
.... r-
Part 16 STRUCTURAL ANALYSIS
-·--·---D Cac,1 ir ::iiace Vault
I.J Roetc1irn1g Wa:,
!:J Ra:;kcry > 4· High J D St~uctJr.al on Steep Slope
:J Otho•
---------. ·--,---·---··
r
;!~;~,v::;;:;,~~:::;~~:e~:~~~t. ~:;~,~;;:::e ;,e A:tca! ,;t:con,i,;it>~:::~:e~ed we,e .
1rco 0 porated into !ni~ wmkshm~t .ird tr,e a~ti:1crec Tecrnical lr-for,r,at1on Rf!port To the best o' my
knowledge the info ation pro 'ded nere 1s accurn:e.
! _..C.::a'.'..a..J..c=f:::!::::"'c:::=----~===--.:o:<r:i'..."°.::::::::./,.:'."..'.o:'.:/..'.~:.... ______________ _
. _ ·-"· .. -··--·-··-·-··---~''~·d !),;!u
Project #10439013 Page 8
Firestone Complete Auto Care Technical Information Report Renton, Washington
Site Location
Figure 2 -Site Location
Location: 17808 1081h Ave SE, Renton, WA 98055
Section/Township/Range: NE Quarter of Section 32, Township 23, Range 05
Parcel/Tax Lot(s): 3223059104
Size: 0.88 acres
City, County, State: Renton, King County, Washington
Governing Agency: City of Renton
Design Criteria: 2009 King County Surface Water Design Manual (KCSWDM), and the City of
Renton Amendments to the KCSWDM (February 2010)
PACLAND Project #10439013 Page 9
Firestone Complete Auto Care Technical Information Report Renton, Washington
Drainage Basins, Subbasins, and Site Characteristics
Drainage Basin
The project site is located in the Lower Green River Subwatershed, which is part of the
Green/Duwamish Watershed. It is in the City of Renton Black River drainage basin.
Existing Subbasins
The design of the existing site used a single basin with an area of 0.88 acres. The southeast
portion of the site of the highest in elevation at 410'. The area gradually sloped west until the
finished floor of the building about 402'. The northeast side of the site starts at an elevation of
408' and slopes downward toward the west side of the site where it has an elevation of 400'.
This whole subbasin creates a drainage system that allows water to flow from east to west. The
northwest corner of the site has a catch basin that conveyed water into the municipal
stormwater system. There is another discharge at the southwest corner of the site due to the
valley that runs east to west along the southern part of the site.
Proposed Subbasins
The proposed storm drainage system will be comprised of one subbasin. The north subbasin is
about 0.88 acres in size. Stormwater that lands north of the ridge follows the grading toward
the valley just north of the proposed building footprint and drains north to the detention
system. Water that lands in the south of the ridge drains into the valley and into a catch basin
which leads to the same stormwater pipe water that lands north of the ridge. Stormwater that
falls south of the retaining wall follows the grading below the proposed footprint and out
toward 1081h Ave SE.
Table 2 -Site Areas
Surface ExistinQ Area (SF) Proposed Area (SF)
Roof 2,SS2 7,700
Landscaping 15,228 11,095
(Pervious)
Pavement 18,085 17,710
(PGIS)
Wood Deck 522 0
Sidewalk 1,756 1,602
(NPGIS)
Total 38,107 38,107
Site Characteristics
The property is located at 17808 1081h Ave SE in Renton, Washington. The site is bordered by
1081h Ave SE/WA 515 to the west, Jiffy Lube to the north, a residential area to the northeast, a
vacant commercial building to the south, and 109th Ave SE to the east. The site is currently
developed as the Skipper's Seafood and Chowder House, which has a building footprint of 2,552
PACLAND Project #10439013 Page 10
...
Firestone Complete Auto Care Techn ical Information Report Renton, Wash in gton
square fee( w ith associated pa rkin g and land scaping. The entire lot is approximately 0.88 acres
i n size. This project proposes to demolish the existing restaurant and parking lo t , then redevelop
the site to become a Firestone Complete A uto Care.
The proposed project w ill inc l ude the co n struct ion of an approximately 7,700 SF Firestone
Compl ete Auto Care building. The overall paved area wil l be approximately 0.30 AC, and the
overa l l ch ange in imperviou s surfaces (roof and pavement) is approximately 0.10 AC. Water
qua lity treatme nt w il l be provided for an area equ ivalent to the pollution generating impervious
surface on site.
Soils
Websoil Survey
Figure 3 -Site Soils (USDA Web Soil Survey Map)
The site is mapped as A lde rwood gravelly sandy loam Oto 8 percent slopes (Ag B) and
A ld erwood g ravel ly sandy l oam 8 to 15 percent slopes (AgC) accord ing t o the USDA Natural
Resource Conservat ion Service, Web Soi l Survey for King Co u nty Area, Washi n gton.
Geotechnical Report
The following informati on was gath e red from a report created by Zipper Geo Assoc iates, LLC. on
August 29, 2016. 4 feet deep under the surface, ZGA 's infiltrati on t es t record ed t hat the so i l
observed was glacial till w ith med ium dense, lig ht brown with some oxid ation, sandy loam with
g ravel. Underneath this soi l was unweathered glacial till consis ti ng of dense, tan, sandy loam
with grave l. The bottom of the infiltration test was at 8 feet. The report showed dense, tan,
unweathered g l acia l till at th is depth.
PACLAND Project #10439013 Page 11
Firestone Complete Auto Care Technical Information Report Renton, Washington
No groundwater was observed during the infiltration test. There were also no signs that the
seasonal groundwater may be higher than when observed.
ZGA performed a single sma ll -scale Pilot Infiltration Test per standard of the Storm Water
Manual. The results of the test were that the infiltration t est was approximately 0 .2 1
inches/hour. According to Table 3 .7 in the City of Renton 's Amendments to the King County
Storm Water Design Manual , a correction fa ctor of 4 must be used to derive the design
infiltratio n rate from the observed short term infiltration rate. After applying th i s co rrection
factor, the site has a design infiltration rate of 0.05 in/hr. The geotechnical report, along with a
previous report performed by Profe ssio nal Service Industrie s, In c., (PSI) are presented in
Appendix F.
PACLAND Project #10439013 Page 12
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 2-Conditions and Requirements
As required by the 2009 King County Surface Water Design Manual (KCSWDM) and City of
Renton Amendment, this project is subject to a full drainage review. Therefore, the storm
drainage design for this project is required to comply with all eight (8) Core Requirements, and
six (6) Special Requirements. The requirements have been met as follows:
Core Requirement #1: Discharge at Natural Location
All surface and storm water runoff from a project must be discharged at the natural location so
as not to be diverted onto or away from downstream properties. The manner in which runoff is
discharged from the project site must not create a significant adverse impact to downhill
properties or drainage systems.
Response: Onsite runoff will be collected, conveyed, and when necessary, treated. All onsite runoff
is subsequently conveyed to the City of Renton storm water system. The city system discharges
northwest of the site into Panther Creek. No downstream impacts are anticipated as a result of the
proposed improvements as the impervious area will remain approximately the same.
Core Requirement #2: Off-site Analysis
All proposed projects must submit an offsite analysis report that assesses potential offsite
drainage and water quality impacts associated with development of the project site and propose
appropriate mitigation of those impacts. The initial permit submittal shall include, at minimum, a
Level 1 downstream analysis.
Response: See Section 3 of this report for a complete off-site analysis. A Level 1 downstream
analysis will be submitted upon civil plan submittal.
Core Requirement #3: Flow Control
All proposed projects, including redevelopment projects, must provide onsite flow control
facilities or flow control BMPs or both to mitigate the impacts of storm and surface runoff
generated by new impervious surface, new pervious surface, and replaced impervious surface
targeted for flow mitigation.
Response:
Per KCSWDM and the City of Renton amendments, flow control will be provided for Peak Rate
Flow Control Standard Matching Existing Site Conditions. A stormwater detention system and flow
control structure will be put in place to match pre-development conditions for the 2, 10, and 100-
year design storm events. A detailed summary and analysis of the existing and proposed
conditions is provided in Section 4 of this report.
PACLAND Project #10439013 Page 13
Firestone Complete Auto Care Technical Information Report Renton, Washington
Core Requirement #4: Conveyance System
All engineered conveyance system elements for proposed projects must be analyzed, designed,
and constructed to provide a minimum level of protection against overtopping, flooding,
erosion, and structural failure.
Response: Portions of the existing conveyance system will be reused as port of this project with
additional conveyance added to accommodate the new building configuration and site layout. The
proposed conveyance system hos been designed to convey the 100-year peak flow.
Core Requirement #5: Erosion and Sediment Control
All proposed projects that will clear, grade, or otherwise disturb the site must provide erosion
and sediment controls to prevent, to the maximum extent practicable, the transport of sediment
from the project site to downstream drainage facilities, water resources, and adjacent properties.
Both temporary and permanent ESC measures shall be implemented.
Response: Erosion and sediment control requirements will be on integral part of the project
construction documents. These measures will include methods to reduce erosion of onsite site soils
and to prevent sediments from inadvertently leaving the project site. Additionally, the ESC
measures will prevent sediment-laden discharge from entering the wetland or existing stormwater
water quality or flow control facilities.
Core Requirement #6: Maintenance and Operations
Maintenance and operation of all drainage facilities is the responsibility of the property owner,
except those facilities for which the City of Renton assumes maintenance and operation, and
must be maintained and operated in accordance with King County or other maintenance
standards as approved by the City of Renton.
Response: An Operations and Maintenance Manual is included in this report-see Section 10.
Core Requirement #7: Financial Guarantees and Liability
In accordance with RMC 4-6-030J, RDSD shall require all persons constructing any surface water
facilities (including flow control/water quality facilities, conveyance systems, erosion control, and
road drainage), to post with the City of Renton a bond, assignment of funds or certified check.
The applicant must also maintain liability insurance.
Response: See Section 9-Bond Quantities, Facility Summaries, and Declaration of Covenant. The
Site Improvement Bond Quantity Worksheet and Dec/orations of Covenants will be submitted
upon approval of the Building Permit plans.
PACLAND Project #10439013 Page 14
Firestone Complete Auto Care Technical Information Report Renton, Washington
Core Requirement #8: Water Quality
All proposed projects, including redevelopment projects, must provide water quality (WQ)
facilities to treat the runoff from those new and replaced pollution-generating impervious
surfaces and new pollution-generating pervious surfaces targeted for treatment.
Response: Enhanced Basic Treatment is required, as more than 50% of the runoff that drains to
the proposed treatment facility is from commercial land use. Additionally, an oil/water separator,
which will discharge to the sanitary sewer system, will be provided for discharges from the
building. A detailed summary and analysis of the water quality basin and design is provided in
Section 4 of this report.
Special Requirement #1: Other Adopted Area-Specific Requirements
The City of Renton may apply requirements for controlling drainage on an area-specific basis.
Potential other adopted area-specific requirements may include: Master Drainage Plans, Basin
Plans, Stormwater Compliance Plans, etc.
Response: The project site is within Washington State Water Resource Inventory Area 9:
Green/Duwamish and Central Puget Sound Watershed Salmon Habitat Recovery. However, the
proposed project will have no effect on any salmon habitats. The project site does not lie within
any City of Renton Master Drainage or Basin Plans.
Special Requirement #2: Flood Hazard Area Delineation
If a proposed project contains or is adjacent to a flood hazard area as determined by the Renton
Department of Storm Drainage, the project must determine those components that are
applicable and delineate them on the project's site improvement plans and recorded maps.
Response: The project site does not lie within or adjacent to a City of Renton Flood Hazard Area
(determined by FEMA FIRM Panel 53033C0979F dated May 16, 1995) and therefore does not need
to apply the provisions of this requirement.
Special Requirement #3: Flood Protection Facilities
Proper analysis, design, and construction are necessary to protect against the potentially
catastrophic consequences if flood protection facilities such as levees and revetments should
fail.
Response: The proposed project will not rely on an existing flood protection facility, or modify or
construct a new flood protection facility.
Special Requirement #4: Source Control
If a proposed project requires a commercial building or commercial site development permit
then the water quality source controls applicable to the proposed project shall be applied in
accordance with the King County Stormwater Pollution Prevention Manual and Renton Municipal
Code IV.
PACLAND Project #10439013 Page 15
Firestone Complete Auto Care Technical Information Report Renton, Washington
Response: Water quality saurce contrals will be applied in accordance with the KCSWDfvl and
Renton Municipal Code IV. A pollution prevention plan has been included in section 8 of this
report.
Special Requirement #5: Oil Control
Projects proposing to develop or redevelop a high-use site must provide oil control in addition
to other water quality controls required.
Response: High use sites area defined as a commercial or industrial site that (1) has an expected
average daily traffic count equal to or greater than 100 vehicles/1,000 SF of gross building area:
(2) is subject to petroleum storage in excess of 1,500 gallons per year; (3) is subject to use, storage,
or maintenance of a fleet of 25 or more diesel vehicles. The proposed development does nat exceed
any of these thresholds, and is therefore not required to provide oil control.
Special Requirement #6: Aquifer Protection Area
If a proposed project is located within the Aquifer Protection Area as identified in the RMC 4-3-
050, this special requirement requires the project to determine those components that are
applicable and delineate them on the project's site improvement plans.
Response: The project is not located within an Aquifer Protection Area, and therefore this
requirement does not apply.
PACLAND Project #10439013 Page 16
Fires tone Complete Auto Care Techn ical Information Report Renton, Wash in gton
Section 3-Off-Site Analysis
Upstream Analysis
Th e municipal storm system com i ng from 109th Ave SE ties i nto the existing p ri vate st orm
system on the East side of the site. The re is minimal tributary area attributes water to t h e site.
Stormwater runoff fl ows from the nearby residential streets and is guided by cu rb s into catch
basins before it reaches this site.
Downstream Analysis
After the runoff passes t h rough the existin g stormwater detention/treatment faci lities, runoff
en ters th e mun icipal stormwater system at 103th Ave SE. After cross ing over 1081h Ave SE , the
system travels northwest about 2500 feet until discharge into Panther Creek. As discussed
earl ie r in the report, the st o rm runoff l eaves the site at the northwes t co rn er and e nters into the
Renton Municipal storm system . The system runs underneath the Fred Meyer stri p mall and
across SE Carr Rd until feeding into Panther Creek. A map o f the downstream a na lysis can be
see n in Figure 4.
Figure 4 -Downstream Area (Renton COR Maps)
PACLAND Project #10439013 Page 17
Firestone Complete Auto Care Technical Information Re port Renton, Washington
Conclusion:
The proposed stormwater managem e nt system for this project has been designed in accordance
with regulatory criteria described above and is consistent with sound engineering practice. The
site has been analyzed to determine the requirements for detention and water quality treatment,
and no significant adverse impa cts to the stormwater management sys tem are expected as a
result of the proposed deve lopment.
PACLAND Project #10439013 Page 18
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 4-Flow Control and Water Quality Facility Analysis
The City of Renton Amendment to the KCSWDM applies flow control standards based on
geographic areas as determined by the Flow Control Application Map. The project site lies
within a Conservation Flow Control Area. This requires a level 2 downstream analysis. This area
requires peak runoff control within the Flow Control Duration Standard Matching Existing Site
Conditions area such that it matches the flow duration of predeveloped rates for the existing
site conditions over the range of flows extending from 50% of 2-year up to the full SO-year flow.
This matches the flow duration of predeveloped rates for the existing site conditions over the
range of flows extending from 50% of 2-year up to the full SO-year flow.
Hydrologic Analysis
The existing and proposed site conditions were evaluated using both the King County Runoff
Time Series (KCRTS) The detailed KCRTS output has been included in Appendix C.
The historic 1-hour duration in the Sea-Tac rainfall region (location scale factor ST-1.0) was used
to model runoff in KCRTS.
Existing Site Hydrology
The existing site consists primarily of a single sub-basin. The site generally flows from east to
west, ranging from an elevation of 410 in the southeast corner to 400 at the western edge,
where a catch basin collects runoff and conveys it to the existing City of Renton municipal storm
drainage system in 108'h Ave. SE. The municipal stormwater system routes to a discharge point
of Panther Creek across SE Carr Rd. Adjacent properties to the north and south do not drain
toward the project, and therefore do not contribute any runoff to the drainage basin. A drainage
swale in the northeast corner of the site accepts runoff from 109'h Ave. SE prior to being
collected in a 36" detention pipe, then released to the existing storm drainage system in 108'h
Ave. SE. The pre-developed conditions and existing peak runoff rates for the project site area are
shown in Tables 4 and 5 below. An exhibit showing the existing conditions is provided in
Appendix A. Existing peak runoff rates were determined using the King County Runoff Time
Series modeling software and the calculations can be found in Appendix C.
PACLAND
Table 4
Pre-Developed (Existing) Conditions
Area Condition
0.44 AC Pavement (PGIS)
0.37 AC Landscape/Wetland
0.059 AC Roof
*For KCRTS analysis, a fully forested condition
was assumed per City of Renton requirements.
Project #10439013 Page 19
Firestone Complete Auto Care Technical Information Report Renton, Washington
Table 5
Existina Peak Runoff Rate
Event Rate (cfs)
2-vear 0.028
10-vear 0.044
100-vear 0.097
Developed Site Hydrology
The developed site will preserve the general configuration of the site, with runoff generally
flowing from east to west, being collected in catch basins located throughout the site prior to
being conveyed to a treatment structure and a detention facility, then released into the existing
system in 108'h Ave. SE. Therefore, existing drainage pattern and discharge locations will be
maintained. The existing detention pipe will be relocated to the northern portion of the site, and
will continue to receive and detain runoff from 109'h Ave. SE. The post-developed conditions
and un-detained peak runoff rates for the entire basin area are shown in Tables 6 and 7 below.
An exhibit showing the developed conditions is provided in Appendix A. The proposed grading
and drainage plan is included in Appendix B. Developed peak runoff rates were determined
using the King County Runoff Time Series modeling software and the calculations can be found
in Appendix C.
Table 6
Post-Developed Conditions
Area Condition
0.44 AC Pavement (PGIS)
0.26 AC Landscaoe/Wetland
0.18 AC Roof
Table 7
Developed Peak Runoff Rate
Event Rate (cfs)
2-vear 0.409
10-vear 0.615
100-vear 0.863
Flow Control Analysis
The post developed 100-year peak runoff rate for the overall site increases by 0.767 cfs frorn the
existing condition. Because the project is located in the Peak Rate Flow Control Standard area
and it does increase its developed 100-year peak runoff rate, additional flow control facilities are
required.
The proposed project includes installation of a subsurface open-bottom modular detention
vault system. A small amount of infiltration, based on the geotechnical information provided in
PACLAND Project #10439013 Page 20
Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix F, was taken into consideration in the design calculations. The total storage provided
by the vault system is 9,975 cubic feet, which is in excess of the required volume of 9,750 cf.
Water Quality System
In order to provide enhanced basic treatment as required by KCSWDM and the City of Renton
amendments, a modular wetland will be installed upstream of detention. The modular wetland is
intended to collect and treat runoff generated by the pollutant-generating impervious areas on
the site, mimicking the treatment effects of a wetland by utilizing a combination of pre-
treatment using separation and pre-treatment cartridges and treatment utilizing biofiltration.
The modular wetland systems have been granted General Use Level Designation (GULD) by the
Washington State Department of Ecology (DOE) for Basic, Enhanced, and Phosphorous
treatment. The approval documentation has been included in Appendix E.
Table 8
Water Quality Flow Rates and Facility Sizing
Basin Design Event Rate MWS-L-4-8-V Treatment
(cfs) Flow Rate (cfs)
A 2-year 0.190 (Downstream of Detention)
A 60% of 2-year 0.114 0.115 (Upstream of Detention)
PACLAND Project #10439013 Page 21
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 5-Conveyance System Analysis and Design
Conveyance
Per the 2009 King County Surface Water Design Manual, Section 4.2.1.2, the on-site stormwater
conveyance can be calculated based on gravity flow analysis of the piping network. Peak run-off
associated with and up to a 25-year storm event has been determined to be adequate. Uniform
flow analysis utilizing Manning's equation, shown below, was employed with a Manning's
Roughness Coefficient (n) of 0.012.
Manning's equation -Q= 1.4/n xAxR 213 xS 112
With: Q = Flow (CFS)
n = Manning's Roughness Coefficient (0.012)
A = Flow Area (SF)
R = Hydraulic Radius = Area /Wetted Perimeter (LF)
S = Slope of the pipe (ft/ft)
Based on the revised basin areas and existing pipe sizes, the existing conveyance system is
adequate for the 25-year storm event. All new conveyance pipes will also be designed to convey
the 25-year storm event. Additionally, the overflow from a 100-year storm event will not create
or aggravate a severe flooding problem or severe erosion problem. See Appendix C for
conveyance design calculations.
100-Year Flood/Overflow Condition
Review of the current FEMA FIRM maps (Panel 0979 F) indicates that the project site lies within
the Zone X, which is determined to be outside of the 100-year flood plain. If the existing storm
system were to experience a major storm event, the stormwater detention area would overflow
in to the front access and drain out toward 108'h Ave SE.
The stormwater system for this project has been designed to address the storm events in
accordance with design criteria described previously. In the event of a larger storm, it is unlikely
that the system would fail. Based on a review of the site and immediate surroundings, the
overflow of the stormwater conveyance system would allow surface water to sheet flow to the
public storm system in 108'h Ave SE.
PACLAND Project #10439013 Page 22
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 6-Special Reports and Studies
The following Special Reports and Studies were used or have been completed for this project:
• Field Infiltration Testing-by Zipper Geo Associates
• FEMA FIRM Panels 0979F dated May 16, 1995
PACLAND Project #10439013 Page 23
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 7-Other Permits
The following governmental approvals or permits will likely be required for this project:
• City of Renton SEPA Determination
• City of Renton Site Plan Review
• City of Renton Building Permit
• City of Renton Construction Permit
• City of Renton Demolition Permit
These permits will require approval by the City of Renton Planning Division or the Department
of Ecology.
PACLAND Project #10439013 Page 24
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 8-CSWPPP Analysis and Design
All erosion and sediment control measures shall be governed by the requirements of the City of
Renton and the Washington State Department of Ecology. A temporary erosion and
sedimentation control plan will be prepared to assist the contractor in complying with these
requirements. The Erosion and Sediment Control (ESC) plan will be included with the
construction plans.
1. Erosion Risk Assessment
The degree of erosion risk on the proposed project site is minimal. Slope across the site is
minimal. Runoff will not travel at high velocities across the site and, therefore, will not cause
noticeable erosion impacts.
2. Construction Sequence and Procedure
The proposed development will include an erosion/sedimentation control plan designed to
prevent sediment-laden run-off from leaving the site during construction. The erosion potential
of the site is influenced by four major factors: soil characteristics, vegetative cover, topography,
and climate. Erosion/sedimentation control is achieved by a combination of structural
measures, cover measures, and construction practices that are tailored to fit the specific site.
Prior to the start of any grading activity upon the site, all erosion control measures, including
stabilized construction entrances, shall be installed in accordance with the construction
documents.
The best construction practice will be employed to properly clear and grade the site and to
schedule construction activities. The planned construction sequence for the construction of the
site is as follows:
1. Attend a pre-construction meeting with the City of Renton.
2. Install temporary erosion control features.
3. Demolish existing structure(s).
4. Clear and grub site.
5. Grade site.
6. Construct buildings.
7. Pave site and install landscaping.
8. Remove temporary erosion control features once site is fully stabilized.
PACLAND Project #10439013 Page 25
Firestone Complete Auto Care Technical Information Report Renton, Washington
3. Trapping Sediment
Structural control measures will be used to reduce erosion and retain sediment on the
construction site. The control measures will be selected to fit specific site and seasonal
conditions.
The following structural items will be used to control erosion and sedimentation processes:
• Stabilized construction entrances
• Filter fabric fences
• Catch Basin Inlet Sediment Protection
• Proper Cover measures
Weekly inspection of the erosion control measures will be required during construction. Any
sediment buildup shall be removed and disposed of off-site.
A stabilized construction entrance will be installed at the site entrance to avoid vehicle tracking
off mud off-site. The entrances are a minimum requirement and may be supplemented if
tracking of mud onto public streets becomes excessive. In the event that mud is tracked off site,
it shall be swept up and disposed of off site on a daily basis. Depending on the amount of
tracked mud, a vehicle road sweeper may be required.
Because vegetative cover is the most important form of erosion control, construction practices
must adhere to stringent cover requirements. More specifically, the contractor will not be allowed
to leave soils open for more than 14 days and, in some cases, immediate seeding will be required.
4. Wet Season TESC Operating Plan
Work between October 1'' and April 30th must adhere to the Wet Season Special Provisions
noted in the 2009 KCSWDM.
PACLAND Project #10439013 Page 26
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 9-Bond Quantities, Facility Summaries, and Declaration of
Covenant
The following items will be submitted upon application for the civil permits:
• Declaration of Covenant for Privately Maintained Flow Control BMPs
• Declaration of Covenant for Privately Maintained Flow Control and WQ Facilities
See Appendix G for a copy of the Bond Quantities Worksheet.
PACLAND Project #10439013 Page 27
Firestone Complete Auto Care Technical Information Report Renton, Washington
Section 10-Operations and Maintenance Manual
A manual detailing the operations and maintenance for all privately-maintained flow control and
water quality facilities has been prepared and can be found in Appendix D.
PACLAND Project #10439013 Page 28
Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix A-Exhibits
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report
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PACLAND Project #10507003
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Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix B -Plans
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report
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Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix C -Design Calculations
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Historic Time Series
KCRTS Command
CREATE a new Time Series
Production of Runoff Time Series
Project location Sea-Tac
Computing Series Renton Firestone -Historic.tsf
Regional Scale Factor 1.00
Data Type Reduced
Creating 15-minute Time Series File
loading Time Series File:C.,KC_SWDM,KC_DATA,STTF15R rnf
Till Forest 0.88 acres Scaling Yr: 8
Total Area 0.88 acres
Peak Discharge: 0.096 CFS at 9:30 on Jan 9 in Year 8
8
Storing Time Series File:Renton Firestone -Historic.ts£ 8
Time Series Computed
Historic Peak Flow Rates
Flow Frequency Analysis
--------------------------------------------------------
Time Series File:renton firestone -historic.ts!
Project Location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak --Peaks Rank Return Prob
(CFS) (CFS) Period
0.057 2 2/09/01 17:15 0.097 1 100.00 0. 990
0 017 7 l/06/02 2:30 0.057 2 25.00 0 . 960
0 .041 4 3/06/03 18:45 0 . 044 3 10.00 0 .900
0. 002 8 3/08/04 18:45 0 .041 4 5.00 0 .800
0 .028 6 l/05/05 7:30 0 .037 5 3.00 0 .667
0 044 3 l/18/06 20:15 0 .028 6 2. 00 0 .500
0 .037 5 11/24/06 4:15 0 .017 7 1. 30 0 .231
0 .097 1 l/09/08 9 :30 0 .002 8 1 .10 0 . 091
Computed Peaks 0. 084 50. 00 0 .980
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Developed Time Series
KCRTS Command
CREATE a new Time Series
Production of Runoff Time Series
Project location Sea-Tac
Computing Series Renton Firestone -Developed.ts£
Regional Scale Factor 1.00
Data Type Reduced
Creating 15-minute Time Series File
Loading Time Series File: C ·,KC_ S\/DM,KC_
Till Grass 0.26 acres Scaling
loading Time Series File: C :,KC_ S\/DM,KC_
Impervious 0.62 acres Adding Yr: 8
Total Area 0.88 acres
Peak Discharge: 0.863 CFS at 6:30 on Jan 9 in Year 8
DAT11,STTG15R. rnf 8
Yr: 8
DATA,STEI15R. rnf 8
Storing Time Series File:Renton Firestone -Developed.ts£ 8
Time Series Computed
Developed Peak Flow Rates
Flow Frequency Analysis
--------------------------------------------------------
Time Series File:renton firestone -developed.ts!
Project Location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak -Peaks Rank Return Prob
(CFS) (CFS) Period
0.295 6 8/27/01 18: 00 0.863 1 100.00 0 .990
0.206 8 9/17/02 17 :45 0 .615 2 25. 00 0 . 960
0.615 2 12/08/02 17 :15 0 409 3 10. 00 0 .900
0.238 7 8/23/04 14 :30 0 .347 4 5. 00 0 .800
0 .334 5 11/17/04 5: 00 0 . 334 5 3. 00 0 .667
0 . 347 4 10/27/05 10 :45 0 . 295 6 2 .00 0 .500
0 .409 3 10/25/06 22 :45 0 238 7 1 .30 0 .231
0 .863 1 l/09/08 6 :30 0 .206 8 1 .10 0 091
Computed Peaks 0 .780 50. 00 0. 980
PACLAND Project #10507003
I
Firestone Complete Auto Care Technical Information Report
Retention/Detention Facility Design
Retention/Detention Facility Design
Route Time Series through Facility
Time Series Found in Memory renton firestone -developed.ts£
Years Complete. 8
Reservoir Routing [R/D Facility]
Inflow/Outflow Analysis
Peak Inflow Discharge· D 863 CFS at 6 ,30 on Jan
Peak Outflow Discharge· D 202 CFS at 9,45 on Jan
Peak Reservoir Stage· 2 55 Ft
Peak Reservoir Elev· 2 55 Ft
Peak Reservoir Storage: 9942. Cu-Ft
0 .228 Ac-Ft
9 in Year 8
9 in Year 8
Storing Time Series File:rdout.tsf
Durations & Exceedence Probabilities to File:rdout.dur
Duration Plotting
Loading Flow Duration File:rdout.dur
Loading Flow Duration File:Renton Firestone -Historic dur
Retention/Detention Facility Information
Facility Routing Complete
Duration Calculation .. R/D Facility
Computing Interval Locations
Computing Flow Durations
Computing Durations:
Type of Facility,
Side Slope,
Pond Bottom length,
Pond Bottom Width,
Pond Bottom Area,
Top Area at 1 ft. FB:
Effective Storage Depth:
Stage O Elevation:
Storage Volume:
Vertical Permeability:
Infiltration Pond
0.00 H,lV
130.00 ft
30.00 ft
3900. sq. ft
3900. sq. ft
0.090 acres
2.50 ft
0.00 ft
9750. CU. ft
0.224 ac-ft
1200.00 min/in
Permeable Surfaces: Bottom
Riser Head:
Riser Diameter·
Number of orifices:
Orifice#
1
2
Height
( f t )
0 00
180
Top Notch Weir:
Outflow Rating Curve:
2 .50 ft
12 00 inches
2
Full Head
Diameter Discharge
(in) (CFS)
0.60 0.015
120 0 033
None
None
Pipe
Diameter
( in)
4.0
Click Right Mouse Button or Press Any Key to continue
PACLAND Project #10507003
Renton, Washington
8Completed Yr· 7
Firestone Complete Auto Care Technical Information Report
Historic vs. DeveJopi!d Duration Analysis
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PACLAND Project #10507003
•
Renton, Washington
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10 -2 10 ·1
Firestone Complete Auto Care Technical Information Report Renton, Washington
Developed Time Series -WO
KCRTS Command
CREATE a new Time Series
CANCELLED
KCRTS Command
CREATE a new Time Series
Production of Runoff Time Series
Project location Sea-Tac
Computing Series Renton Firestone WQ.tsf
Regional Scale Factor 1.00
Data Type Reduced
Creating 15-minute Time Series File
Loading Time Series File:C:,KC_SWDM,KC_DATA,STEI15R.rnf
Impervious 0.40 acres Scaling Yr: 8
Total Area 0.40 acres
Peak Discharge: 0.472 CFS at 6:30 on Jan 9 in Year 8
8
Storing Time Series File:Renton Firestone WQ.tsf 8
Time Series Computed
Water Quality Flow Rates
Flow Frequency Analysis
Time Series File:renton firestone -wq. tsf
Project location:Sea-Tac
---Annual Peak Flow Rates--------Flow Frequency Analysis-------
Flow Rate Rank Time of Peak --Peaks Rank Return Prob
(CFS) (CFS) Period
0.190 6 8/27/01 18 :00 0. 472 1 100.00 0. 990
0.133 8 9/17/02 17 :45 0.360 2 25.00 0 960
0.360 2 12/08/02 17 :15 0 .259 3 10. 00 0 .900
0.154 7 8/23/04 14 :30 0 .213 4 5. 00 0 .800
0.202 5 10/28/04 16 :00 0 .202 5 3. 00 0 .667
0 . 213 4 10/27/05 10 :45 0 .190 6 2. 00 0 .500
0 .259 3 10/25/06 22 :45 0 .154 7 1 30 0 .231
0 . 4 72 1 l/09/08 6 :30 0 133 8 1 .10 0 .091
Computed Peaks 0. 435 50 00 0 .980
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report
Conveyance Design Calculations
Manning's equation:
1.49/
Q= In xAxR 213 xS 112
With: Q = Flow (CFS)
n = Manning's Roughness Coefficient (0.012)
A = Flow Area (SF)
Renton, Washington
R = Hydraulic Radius = Area /Wetted Perimeter (LF)
S = Slope of the pipe (ft/ft)
12" Pipe @ 0.5% slope:
l.49/
Q= In xAxR 213 xS 112 = 2.94 CFS
n = 0.012
A = 0.771 (SF)
R = 0.286 @ 95% full
S = 0.005
Pipe capacity exceeds peak flows generated by development.
PACLAND Project #10507003
( .
I '
Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix D -Operations and Maintenance Manual
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Maintain Stormwater Facilities
The owner or operator of the project shall be responsible for maintaining the stormwater
facilities in accordance with local requirements. Proper maintenance is important for adequate
functioning of the stormwater facilities. The following maintenance program is recommended
for this project:
King County Surface Water Design Manual
NO. S -CATCH BASINS ANO MANHOLES
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Componlll'\t ... -.~~fie;· ill P>ttf~d ----·--
Stru:!J'U: Se-:lirr~rtt Si:ermcr. e::ii:c~m i&C''i of th!! dll:JY.11 fr011 '.rte S1.n1s: Qf c.Y.::h b::um1 co11t~n:. r•..1
tmt-Nrn :::t ';1'10 ;:;t!Ch t,1'.Jn lo ?Ile .-wcrt o1 Iha '.t!C!U;crt..
lo'A'C':I>t pp.::; 1nm u o..il ol lhtl; c.,1e11 ba~r: ei• .s
'-'i1U'f0 ti 1rfflc5 c.! tht: !Iv.'<:~ r.t ~he ~1NC:li1 r,pr.
1o!t: ot SH;f :if !!JQ frldl'.h /'),,-:X.n ---
T'1-11!'lh <J'"ll! it!t-m'J'. Tra?h :!! ~b1i;. o( rnO"I! 11>..'t'l S t:1,b,.; fco: "1i:::ff No T•a:.f1 v· dd:vi!l: t..:v:fa.·01,1 q•
,~ lo:.-:sl~ 1'T>rllt"'J1it1t:"y i,, f«;ml .:.ir t-'11:: ,.-,tel-t.11:1~1, IHi'.e1..:.-:W, blr.Jt~nq ~,,t•:sn:e ;-;i
0~1'1!; ef i!S th:i,::kirq t::!!p:tcily ~ ~ Cl!!!.'11 b:!~ill ,c3lch:ii,-;,r1
tiv rr~M-lmlr 1 if\
fr,1~h r-< t' .... tin;. fl th.;:, >die~ lvl$ln 1h.;it ,;.);fi".11:<S N~, trMh ./Jt (1.,.nr:<:. n II"':! r~~,:.''I b;iw,
';, ~il rti>ptfl °cf~\ '.'It. h()(",<:11'r) (!f l'Jtt'i,U' ii} 1ft,'i/r, Iii.)
lfr...,..,.a.: Pl"' 1ot,:i o Q,.JI ,)I lhri!a l\:11,ir, -
De.'tc .!r1n-ul!. e< 'l~eulli::r. \l".ll cooid ~r.<!'·~~ ho !?~:IC :rr,n11ls fJ ve--3e>.:1ttcn
a:::,;r.; ,,.,_ ::::iud CiilU'"A comi:iant:; or ~f'gftrr.tJ:. :irc!ienl wl'!t:11r t.1ltl'. !l.3~r
qasc~ l.:!.g: mcll'~rtc;
'.)._'{)~I'!' ,)I ~f~ll-0~ o:,re<1tdtt; 1 CW.t; 1::,,)1 if• N\.l ("CfXhlt~r, Pft'S~I wl!i(:i· ..,_,u.1Kt
v<Jl.m":'. '9.ttta<:'.{ Cf iuµpurt. ":he nrt-ed>1g ul
;f)~>:b <)( ""00~11. --·-·-----·--·····--~-----------
Dama~ to fr;ur,e toT1Cr ::f ~rl:ln-c t:J;l.cnds. 'rOc<e 11":in t,o lllCh p.Y~ F r.rnc ~ C'l(f"I ~ c1.rt-
a1\Jio• ~cp r."'-m CM/tJ t.Y.,:: ir:to lt'le sltr.d (ti ~ltAbl.'l) ·---------
T,.,.i ,ldob hci!> ho·,:,s blt,l!'l' °l:hllf1 2 '!1,QLIW(' ni;!it<~ 1.:t T ov <:J&ri 111 frto:-er •,d~'> ~rd c, iJt.:h.
(?~JI'} -... i:t,:o, itii,n '.I• ni,;I,
~rnrt1c ,,ct r.~9 ~1'1 orr t,.1,p ~,;o. 1 e F-r.-vnc !,; t.t':r,g ~AJf.'t O'l lOp-r.1.10
~JM.-.r...:ir ,it M{'.NI ":!'Ian ~,. ot.t! ol nu '!!'il!l"!'III" lr.:tn·
t'1~ t.-:.ptJ..1t
C-a:,ii.'1,.11'1 win~::, Cntd<s wtl~ 1)131, •,; ,rr..1:1 i,-1i:i 10.,~· Jti;_,r1 3 J~I. Calr.-t> tinir ~ Jt.oe't1lt!d an.f
"'""" -~m·,-,:<A.ii!:'~ o~ scil ~rtd~ er!.r.!"~ calctt !.1rvctLr:ellr SCU't~
ti:wr !tlr:::!t.q!' ~ or rn:1i1tl!!"!Yt~'! p,;!r!<::ir
JU:ti?O:. lh:ii catcti basin tli, un::.i:~.md
Cr:i;(kS WldH msr, •.~, .t1::':"1 t."10 ''"""'Jli'I' ifiAA 1 fr:.-)1 No c.t.-lCk"-t1·-,r~ lh!\n ·,,. ,1\(;,, w~14 .it
~, fhi< 10111 t;/ 1.t1 ·~· n~ll,)oth;.~ ~if"'" et ill'ly i,.•tic .. 111f .. 1ti'"' ,~i11t ,)f id .. ~•ov11'1!1 ,,i;..,.
...,, ,,.., p!trti<.'" ..... -s. ,,m1<!'f""'lt cs!(h ti~n tt11ooah
aaie:::k_::-
$.('tttcncrt.' C.r:::n ~SM h.J5 ~lli:c more lt'.:tn 1 mch ~, h.» Basar. "'C'!!l.lr.cd rx n:p;u~ ttt oc::.t;1r;
m~9"rnnrt rO'~te;i l""IPn:: e,,in ;.! incics our ,of ..al91'1P'ICI"! ~1,1r<:1.ue~
[),!lft\:fg,,:,-d p~ 1•.ttlt8-Cr&t~!!I wodt!'f thtn ·~·~i'ld· at !1'1e ;onl o1 tf -2 Nv ttiltt.; n-YJ!'!' th&i> ·.-:.-..-icr ·,,.-ico::-&t
irt'~o'Wlkt ll*I'.:~> \JI nn~, c-,kf.,..,c" 'i.lf 'V'Ji -.,nt,:..•!f"".t !t,e ;amt of ir-if::'.'1.•0IJlltit ~~
t•1~ ~h.:h t,~~fl ~t ~1111!, ;"Jl"II ,;,,f (h@ ll~,:ot'OO!i@! •~= ·-·---·------------
C.cws!;unn.ir.:s. ;mj An~ ilto'IOllr.:.., c..~ r.nr.':.ilmn;ar,~, a J>."llt.Jlino i;;M:f'-. Mm,irmh;. r .. m..,,..Ad and o~p~H<:I a
P,"lh.Jti.)f! "' ,,.1 9;u;r.1"'"' r:a1cm1~ r,.-w,-1,(ls; fY r~rt .ir:r.r.f~l"q tti tlPf.tl>:-"lt:IG r"JiJK."1!'l!o
S0\1~·,;:. r.01'1•~-it RMP!> l"'i)~ff-.;:iflt,;td ,f
~r_(l,,)prl<\h,. NQ OJflt<'ltt11\~111s.
()tl!t>l!'fll o;h"' ~ilh j ,;..,r1.-.1c~ <ii· :."i
-------------
ln.-e1,Ch.nlet Ptie S,c,dirr,c,nt Sti<iMt:01 fill~ 20~,,. ('f men: -:;,f the ~Cle lf!let::::u:~t ppu d~t of ~nr.er.t
actU"llu'..llJ::Jr.
r,a;.h ..i·1e dl:'bn~ fr(l;@i ~nd ~llfi!) tt<.o .. n1t4a1~ n it>l~·.'ov11it-1 11;,J lrg~h ,.i1 do,o(,11 ~ ,, l)fp,;,r.
p~e,, ;,r-..;:h,,(1,t,S l'lv~\itble-t. dfld 11<)';--"-a;)lkdt,I~': I -------.. ---·----·--··----
Oam.ar;,o:1 {;r;3ct,s; wldC1' t!"\:m "~ utct'> ~l ttit ,on! <ft the lio cr:icks ir.:m:i lhllr 1/, vu:I' -...u:o ;r.
nol•c..1111:t i:ir~cs ::r .sny 1::v1:x"1cr. .if $01 crit,:,n..-.;i ltie pl!ll ol thr:-rrich>.lllcl pq;c:,
:ti tru: jo.n1$; rJ! IN': 11lr:-r.'!ll.."X!I ppes -·-------
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 5-CATCH BASINS AND MANHOLES
Maint1mance Defect or Problem Con-ditJon When Maintenance k;. Needed Results Expe,c.ted Wh•n
Cornpone-nt Maintenance ls Performed
Motal Gt<11B'S Unsaf~ grate opemng Gr.ale with opening wider than ',r~ inch Grate-ooening ~els daasign
(Ci'!h::h Sut;;im;) sland;;ird:;.
Trash and deoris. Trash ano oebris 11\at is blacking mare than 2(1% Gr.ate-fre1:; of lras.h and debris..
of grate sorface-. footnote t!l guidelme:s for disposal
Oiltn.,[]t::<.l Of rrii:sSiri!J Gr..tle mi:;:S,11ig or WO~en m-emberist of the g,;tle Gr-i'ile r.o, in pl;;i,;::c: and 1"1eels t1esi911
Any r;,.pen struc.tura r•quire& urg,mt s1an113tdS.
maintenance.
Mant1{1II! r'Awet.'Lili Co11er,bd !ir)t 1t'l pl;)¢~ CIWP.tllu.1 l$ fllt!lS1!19 ()f only P.,""tft1;)II~· 11'1 µIm:~ C:o..,~r.'l!d pro1e-cts OPlll'llfi!J 19
Any op,o,n struct\lra r-.quir-95 Ullilllnt s.lfuciute.
malnlenanc.e.
--
Locking m1:,chan1sm MP.c:hal'll1!.m t:imnot ™' opened by one Mechat'l1~ open~ W11h prop11f tools.
Not Worktng ml'.lm1enance peraoo ~ilh proper tools. Bons
cannot b':" sealed. Self-locking co~·erllid does oot
work.
Cwett.,d dirfl~ult to One rn-.l'1ntfllna,-,~ p~r$orl l'.:.!t'lriO( term.:,~ti CrJ'.-er/lld r,ari b~ r,17110>1~ ;)1ld
Re,n1,0~ C-Q.Y~r>'lid attN applying ao lbs of Ht. 1ems.-lal11:,d by one mainkMnc:P.
p~rson.
-~
NO. 6 -CONVEYANCE PIPES AND DITCHES
M=iinteru;.ncc Ocft!!ici; or Pr(lbl~rn Col'l<lmons When Malnt~M« i!t N'cedcd Results E.11pll!-eted WhCf'I
Co,mpon.i-nt Malntonanco 1.5 Perforrm,i;I
Pipes Sediment & debris Accumulated sediment or debris that ex,ce.oos Water flm11•s freely tt'lrough pipes
acwmula!ior; 20% of the diameter of the pipe.
Vi:::geta11011/rori:s Vegi,tation.'roolS thal reduci::: free r'll-0~/'netll or
water \hiough pipltS
W<.\for now& trr;:P,,'Y \tmiu9h pipe$
Contaminants and My evid~c;e of contaminants or pollution such Materials removed and drs~s.ed of
poUvl.ion .as oil, gasoline, con<:"rate slurries or paint a,c:cording Lo applk:able regulations .
Soutr::e oontrol BMPs implemgnted if
appmpricito No oonlillniiriaril$
pt~$ent o1her than a "!lvffa-oe c,,1 mm
Damage to pro:ective Protec1i',•e coating is damaged; ru5-t or oorro,aion Pipe repaired or n:placed.
c.oating or corrosion is w~kening 1he structural intagr<1y of any pan nf
pipe.
Damaged My de-nt that decreruies !tie cr.;;:,s.s !.eci.ion area ot ?.pe repa:1fed 0t ffif.'ll'.lced.
p,pe by more-lha:n ~0% or is detennined to, ha-.,e
\M.!eakooed strvciural mtegrity ol1he pipe.
Ditches T,..-st, and det>ris Trosh and Gebris exooeds 1 cvbic fool per 1.000 Tr..rnh arid dsbri,; ciaar«l frQ<11
SQu..tie feel o1 dildi and $!ope$ di1ehi::S
Seoor.ent Accumulate-cl seaiment thaL exceeds 20% of the Ditrn deanediflushad of aU sediment
accumulation design depth. and debns so tr.at it rnatch,e,s de11ign.
No:OOLI$ weed$ Any no~loos ('JI' nuJ:.;)ncc 11e9c1auon which may NoxlUV$ ar\d nu1$tmee ~·egel..l11i:.lf'
t::Ort$tih,Jt,e-0 hanud lo Covn1y personnel or th~ t"emove-d ar:oordlr19 IQ 11pplicable
public. r~u1a11oos. No d.-inger of noxious
vegeta1ion where Counfy personnel
Of the public might normally ne.
C-Onttiminanl.$ Md Ariy cvident:e or r;onlarnirtlilnts or pollutiori such Maten.;)ls. removed and th$p,o&ed or
pOlh.it,on st$ ott. gaMllne, ,:;onctie-1~ slurrlfls-. ¢r i:;,aint t1ecord1ng 1(1 applicable regvlatioris
Source control BMPs 1rnpleme-nled rf
appmpt1ate. Na contarnman1s
present oth,er th.an a surfac-e Oll film.
Vcgcl.-cl~on Vcgctt1lion lht1t rcduccs free movcnmm or waler Wc1lcr nows frccfy brough dil,c;.hci;.
!ht~!Jh dltt:hes
Erosion damage lo Arty eroS10n abser~ed on a ditch Solope. S!opes are nO'I eroding.
s!ope~
RQl'.i! lining Oll! {)f Of'tri l~yer ot less 01 ro(.:k cx1sis. above na11•1e s<>il Rept.ice ror::ks to ¢t:::;,9n S1.:W'ldards.,
place ur m1~5ing (If area f;, square feet or -m¢re any el(po$W nr,i(1ve
Applicable-) !!Oil.
-
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 9-FENCING
Maintenl)nee Dl:,ect or P-robltm Conditions When Malnlen:im::e iii N<,,~ded Ruults E.11:p~c!ed When
Compi;>ne,nt M;iint,m;mnca h• Porformad -
S11e Erosicn or holes Eros1nn or hci-es mare 1han J 1~c.nes h,gh and 12-Na access under Lhe fecnce.
und~r fem-~ 1 B 1ncnes 'hid-e permitting .ac-:<2ss L'"'ir~ugh an
oponir19 vndo:v a fence -----~---
1,'.'nod Pris.1~ i}11:;1rCs M 1ssin9 (Jr dan1Hg•~d Mr$s.1n!-l or broktr, hu~rds. po~;t O'Jl o• plumb by Nu 9;)(>$ or r~ncti ,1~w 1r,; misi:f.rl'l!i ut
ar-d Cros."!'I Mernbel'"~ pans mor~ ~han 6 li'lc'he!i. D< cro:;s mf.-mbers braio:el"I b((Jk:~n board5., po:,;t plumb to ·llithln
1 ',S inches, cross membefs sour,d
Woal<.Bn-eod by rr-Ating Any pa1 showing 5trudural de,erioration due-10 AU parts o~ fonc,e aro s1ru-:::turaJly
or insci:;ls ro!tir19 CJ" ins-<:ct <fr1m,igc sour"Jd
Damaged c,r fait£.d Ccn.cr,e.te or me1al a:tacnmen:s d;;.te-ricra.te<: vr ?os.1 foundati,:-.m ::apabir vf
pest foundation unable to s.upport po.,;ts. supporting po"S!s even in sirong
wind.
Mi::t::ll Po-ms, Rails DamarJctd part$. Poti-1 nut or pl\Jf'M 'l'l()re than 8 intlltlf. Pos.1 plumb tu .... ,iri r, 1 :s 11",f:hi:s..
ar:~1 Fabric:
Top-ra!s bent mare than 6 1nch£os. Top rail fre,e of bends greater than
1 in-:h.
Ari'/ Pi:!1 Ill 1enc-e \int:\J/Jm9 posl. top r.;)1ls. <•~ F ~r1,:::e 1s ~lign!!d ~nd m~e-1$ dl'!Sl~Jn
labn-e-/ more thar'I t tom cut of de-,u90 .'!llignme-nt stanct.a,dr..
Missing or loo-ss tansio,., wire. T en-sio.n wirn in p!aco and holding
fabr:,c,
Dete-naraled: paint or Part()( parts !"lat ha•re a (1,J!l.11r19 or scahl"fj S1rueturally aef~qu21.e-f16!'.1s or part!'.
prctect1~ ccahl"lg cand1t.on tr--sat 1,as a'fec1ed struct.Jral acte-qua..cy. with a unrfonn prctectl'.ie coating.
Opening-s in fabrk Ommings in fabric ar-e such that an 8-im.:h Fat.ric: mesh openings within 50'% of
d1amolcr bttll could !it (hrou!Jh !Jr11,j Sile
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 10-GATES/BOLLARDS/ACCESS BARRIERS
Mialnk-NnCi:!' Defect or Problem Coll1IJ'llon!I Wh,m Mainten:mc~ 1'5 li-ecded «1!''5LJlt5 Expecll!d Whoen
C;omJJonont Muntan;anca ts P.rforrne-d
Ctiai1• link FE;riCt"l!f [},:1rr1-3;1tt<J IJ r•ni~r"ttl r.1,s.Sir•a !)dle Gal~t'l~3"',J!;I
G11t-::i ff'l;'')l~f:,0
Brokon or mis:.rm; tungo!'i :.och lh.'ll 9::110 c::imc:t Hinge:. 1rt.1ct iWIC !Ul:lcd. G.:ilci5-
be c.,1a1'l apcnc.<I .lll!I cl~1 b}' .i m;urr.r.r...Jncc 'hT.d:mg: 1rer.ly.
pn;r!..:ir;
G.al~ i"i! uut or p-..11,t:i ri"r.11~ thfrti ti ir'"Dil'':I il'Ht C'-!!le ~ -etlf'Jril::'d ;:t,115 \'t'l:k.:11.
r,1;.re t"18n '\ ~;;Q'l i..'l.fl ~ d~'!:911 ali!,1'1tr~nl
Mts.S.ing :;trr.td'lr.r b.lr, ~1rr:lch:'!r n.vir1a :ird th':!'; S1r..':1r:t'..;;r :lilf. b;ir,:hi, ;;'i'll'.1 ii..~!. m
pl.1r.fl
Lock.if'Y.i 1·1ed·--':l11i!Sm Lr.n;t,i:1~ th:!·"'i.:I!' •i,i-S!iling. rio--h.wtiil,),1i111, -:if due!i L.;c:ki11!J tr~i:;h8'"1i's•11 µti!"l'l!f'rtS
<lot":; rol h.-..:.k gjjl~ r,,JI hrk tc.1 ::ti p11tl~. 011~1i·1~-:.sfqttl~.
op,;:nin~ n fii!ln..: 0por11-.g~ 1r. 1;ibfir. an1 :$i,H:h t'l;;;;: ;m H·t'lr.h f'..::11nr,,:, m~ opAr.ri3,; li'lllh1r !,t:"'.'i -:if
Q,;ur~htr b;il! '·"1,IC:: 111 lh!"CJ.Jgh. grid;~
BIY G~:dl! ~'fl~l'~ r:,r n1b"!,.,rf'J Cro~s L~, <lL"ll!:"S 1:01 !IWift!,I oµie-•1 eo· r.;fo~il. :"J. Cri.11s tL:tr S""'.irv.as ru:i~ cr,1~ ~mi
::ro~i:.:r mf!.'!.!r,g JY is b!!r~ to ·"t'R'!re iL d;i~ 'lo'! pr~.,.1!!'·1t ciOY.!d .!lfld µreve<""11.!s •.--e,'1ii:le! &:::c"C's:..
\lehic~ ,~,::ce:;~.
I ,x:::lo~ rn1cu:t'~nu;.n, I <ir.tmg d6'.1r.,,,;: m1;;1n9, 11Q.f\.n:c1:1omn9 >!)r t1<,i<:t$ t xt1n9 rn;,,r.h~t&m pr~\<ijrr,s
{lf,ii!:< IX!t h::,.:·J. 9il~ ft{ll hr1, Yo) .;tJ p~r1lii 0.Df'?:'11'1!: {If gtlOO
$1.pvc,rtp~l &1i:,p:Jrl posl d:i~!l not !ndd eto!;~ b~· up. Cruss b.lr hl!',d up pr~~1lh"9 veh-:11!
d~ .. nmgtd 31:i:!!$5 ir.t:J f.:idily.
Bn1l¥Q:i. D,''lfl>a:J&1 C£ nu~"i>ng B(il..tri:l tl<('.#jJ:111. m11:1&il"l!l <1~1:, rl:il m wt!:} si;ppon Ni) ar.i::es,;. t~r n-.::ilYl'Zt;Li:i ·\•t1t.1;-Jes t::,
IWl8' •)r hi,i~ t;..-c,k.E,n o< illii;srtg ,Jf!l ,r"llo ~acill)·
Doe:s m1l lo=.\I.. Locldng. ~sse:rnt:1'.i' oc lode. mis5t'l!J ,:ir ce:imct oe No :iccC4l'S for ITY.Jlcrize:d ~!!hid~ ~o
ilf1ilChed to io=i.. bcilarc: in pl~-e. gel ,ntD ~3ciity
Eh';..11<:1ers C,sJ00':]1:!d Bo1Jlt'$.tf:$ ,.-.,::.t: t1cal.e::l 1;.::l ~rt 'Y'O'l¢f1?~(.! Y,i,hlr;1$ Ne• att~s.s. ~r moloozM ~,et-.Cl~,s '!-!.I
"""'" !,{It ·r"III} 19Cilt'(
Cirtumver0~1!d Mritori:zed ,,.et,ide!; g:cmg 3'0Jr:d °'" balWl!C'l No MCM!i •,!Ir molorizl!d vl!t-id~ ':l
b:n.11oers.. gd ;nlc fac1lty
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 11 -GROUNDS (LANDSCAPING)
M::.!l~Ninc~ D@.fo!'c! or Prabl~ Con.di.tions Whr!n M;'!lintt!nance i5-Nel!'dt!<.I ~e--sults E~p,ected Wh,en
C:-cimJIOllflnt Matnlen.:wtC-C G Porf.armjul
Sile Tf$9'1r;j[ill':"' Ari~· 1ra1:1h :H!d i,~t,r~ "'hr . .h ~·o:.~i:, 1 n~i;:: f1x,t T,t:1~h 1:11,d r;..;.l:.i~ tJ~•ilt~d lf:)lh SO:t,
t)t'r ~ .0!'.:0 :qWI~ (t't'l ·;ll'F·~ rl dbti.il 1';;'7.ll-:il Ii,:, tl,t"
;;:'11'110'.Wt ;,i( ~·~~·1 ii '/IIWld [~~!! l<J rir ;ip :Jr~
1:11;:rnd!!rd ~i.i:!! ol!it:t! q::irtJ;y~f! t0d11L 1-1, Q!!l'~t,!tl
lh!!rt= ~:afld b,e, 110 ,,.~1:11 e<,'i:!!!1-..::,e o, du-rpin:i.
Nc1~;:,11l< l'IG(:;i!1!; t•.n)' n,:i.:<u1!. r,r t~i,u;.:inr.A "'"'-)G.t;:ilu::n .iri1:.ll r'1;:i~ N,:iu.-~.11; ""111 r1111~;mr . .i ·~k'J,:;t;.:ihr:n
rr,.-,r,1111,::~ ~ h~~rd 1 ... c~11mty Mr:.(nNl ::r th.i r.:-mr,..-,.-:,:1 ;.; .. r,:H\1111g 10 APfl•('.,;'.:t,loii
j)Jh41(; fl?Q(ll,jJ",1)% ".lo (1~·1~r .:if n::::.0:1:::l:s.
"'lf<~':"'81.i(,r) '\,r,i,~ -(OJ•°'~)' f1,:.tl,!,:,r·1f1t;,
•J' 1hto f;v!lhC tid!fh! 1'1(,tt)1$,lly li.:,
C:,:)nt."Jmu.:int.s .-ird An~· r!',11:~m:e-:if conl.:!rr~Nrts. :ir po1u:1::ir si..,c11 M.:t,cf;;i~ fC\,tOVt:11 .:ird !11~po~!'le :if
ncili.t~on i'l:-0 -:UL i;il:-.::ih'lc r.r:ru:·~c1c :auno:. or pi!ml ,;;ic:::ir:lmg lo ..:i1=1=1tc,1itilc rr:guliltio,a.
,S.:11.rc,: ::~1rt-o-BMP::. rTif'.ic.'T!C'ltM rf
rir,p-n;:ir.;-i1A N-.1 ,:11r1t;i.mln;1t'll~
.;ir41;Arr. iAtiAr th,w ,1 ::a.t1?1r.A cil •.ii-,
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PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 18 -STORMVVATER WEnAND
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PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
NO. 24-CATCH BASIN INSERT
Maint111nance Oefed or Problem Conditions Whll!ln Maintenanc@ is Needed Results Expected When
Component Maintenance is PerformeQ
Media Insert Visible Oil Visible oil sheen passing through media Media inset replaced.
Insert does no! fit Flow gets. into catch basin without going through All flow goes through media.
catch basin proporly me-dia.
Filler media plugg-e-d filler media plugged Flow throLJgh filler medin is normal
Oil absorbent media Media oil saturated. Oil absorbent me-di::1 replaced.
saturated
Water saturated Catch basin insert is saturated with water, which Insert rep[aced
no longer has the capacity to absorb.
Service liff! exceede,d Regular interval re,placemen1 due to typical Media replar:e-0 at manufacturi:n's
awnage life of meOla insert product, typically one r1sH:omrnended interval
month
Seasonal When storms occur and during the wet season. Remove, dean and replace or mstal!
maintenance new rnsert after major storrr,s.
monthly dunng the wet season or at
manufacturers recommended
interval.
PACLAND Project #10507003
Inspection Guidelines for
Modular Wetland System -Linear
Inspection Summary
M OD U LAR
WETLANDS
o Inspect Pre-Treatment, Biofiltration and Discharge Chambers -average inspection interval is 6 to
12 months.
• (15 minute average inspection time).
o NOTE : Pol lutan t load ing varies gre atly from site to s ite and n o two s it es are the same. Th e refo re ,
th e first year requ ires ins pection mon thly du r in g th e wet season and every other month during the
dry seaso n in orde r to ob serve a nd record th e amount of pollutan t load ing the system is receiving.
System Diagram
Access to separation chambe r
and pre-filter cartridges
Curb Inlet
Individual Media Filters
Pre-fi lter Cartridge
1
Vertical Underdrai n
Manifo ld
OioMe di oGREEN
2
· .1 Pre-treatment Chamber
: 2 , Biofiltration Chamber
.>.'<-~
',}': Discharge Chamber
Drain-Down Line
Flow Comro! Riser
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3
MODU L A R
Inspection Overview WETLANDS
As with all stormwater BMPs inspection and maintenance on the MWS Linear is necessary.
Stormwater regulations require that all BMPs be inspected and maintained to ensure they are
operating as designed to allow for effective pollutant removal and provide protection to receiving water
bodies. It is recommended that inspections be performed multiple times during the first year to assess
the site specific loading conditions. This is recommended because pollutant loading and pollutant
characteristics can vary greatly from site to site . Variables such as nearby soil erosion or construction
sites , winter sanding on roads , amount of daily traffic and land use can increase pollutant loading on
the system. The first year of inspections can be used to set inspection and maintenance intervals for
subsequent years to ensure appropriate maintenance is provided. Without appropriate maintenance a
BMP will exceed its storage capacity which can negatively affect its continued performance in
removing and retaining captured pollutants .
Inspection Equipment
Following is a list of equipment to allow for simple and effective inspection of the MWS Linear:
• Modular Wetland Inspection Form
• Flashlight
• Manhole hook or appropriate tools to remove access hatches and covers
• Appropriate traffic control s ignage and procedures
• Measuring pole and/or tape measure.
• Protective clothing and eye protection .
• 7/16" open or closed ended wrench.
• Large permanent black marker (i nitial inspection s onl y -first year)
• Note : entering a confined space requires appropriate safety and certification . It is generally not
requ i red for routine inspections of the system .
~i/ ,?
i
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I
__ I , • A , _ ,-_
MODULAR
WETLANDS
Inspection Steps
The core to any successful stormwater BMP maintenance program is routine inspections. The
inspection steps required on the MWS Un ear are quick and easy. As mentioned above the first year
should be seen as the maintenance interval establishment phase. During the first year more frequent
inspections should occur in order to gather loading data and maintenance requirements for that
specific site. This information can be used to establish a base for long term inspection and
maintenance interval requirements.
The MWS Linear can be inspected though visual observation without entry into the system. All
necessary pre-inspection steps must be carried out before inspection occurs, especially traffic control
and other safety measures to protect the inspector and near-by pedestrians from any dangers
associated with an open access hatch or manhole. Once these access covers have been safely
opened the inspection process can proceed:
• Prepare the inspection form by writing in the necessary information including project name,
location, date & time, unit number and other info (see inspection form).
• Observe the inside of the system through the access hatches. If minimal light is available and
vision into the unit is impaired utilize a flashlight to see inside the system and all of its
chambers.
• Look for any out of the ordinary obstructions in the inflow pipe, pre-treatment chamber,
biofiltration chamber, discharge chamber or outflow pipe. Write down any observations on the
inspection form.
• Through observation and/or digital photographs estimate the amount of trash, debris and
sediment accumulated in the pre-treatment chamber. Utilizing a tape measure or measuring
stick estimate the amount of trash, debris and sediment in this chamber. Record this depth on
the inspection form.
-.modularwetlands.com
1-.
MODULAR
WETLANDS
Inspection Steps
The core to any successful stormwater BMP maintenance program is routine inspections. The
inspection steps required on the MWS Linear are quick and easy. As mentioned above the first year
should be seen as the maintenance interval establishment phase. During the first year more frequent
inspections should occur in order to gather loading data and maintenance requirements for that
specific site. This information can be used to establish a base for long term inspection and
maintenance interval requirements.
The MWS Linear can be inspected though visual observation without entry into the system. All
necessary pre-inspection steps must be carried out before inspection occurs, especially traffic control
and other safety measures to protect the inspector and near-by pedestrians from any dangers
associated with an open access hatch or manhole. Once these access covers have been safely
opened the inspection process can proceed:
• Prepare the inspection form by writing in the necessary information including project name,
location, date & time, unit number and other info (see inspection form).
• Observe the inside of the system through the access hatches. If minimal light is available and
vision into the unit is impaired utilize a flashlight to see inside the system and all of its
chambers.
• Look for any out of the ordinary obstructions in the inflow pipe, pre-treatment chamber,
biofiltration chamber, discharge chamber or outflow pipe. Write down any observations on the
inspection form.
• Through observation and/or digital photographs estimate the amount of trash, debris and
sediment accumulated in the pre-treatment chamber. Utilizing a tape measure or measuring
stick estimate the amount of trash, debris and sediment in this chamber. Record this depth on
the inspection form.
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I
MODULAR
WETLANDS
• NOTE: During the fi rst few sto rms the water level in the outflow chamber should be observed
and a 6" long horizontal waterm ark line drawn (using a large permanent marker) at the water
level in the discharge chambe r while the system is operating at 100% capacity. The diagram
below ill ustrates where a line should be drawn. Th is li ne is a reference point for future
in spections of the system:
Using a permanent marker dra w a 6 inch long horizontal line, as shown , at the
h ighe r water level in the MWS Linear discharge c hamber.
• Water level in the discharge chamber is a function of flow rate and pipe size. Observation of
water level during the first few months of operation can be used as a benchmark leve l for
future inspections. The initial mark and a ll future observa ti ons sha ll be made when system is
at 100% capacity (water level at maximum leve l in pre -treatment chamber). If future water
levels are below this mark when system is at 100% capacity this is an indicator that
maintenance to the pre-filter ca rtridges may be needed.
• Finalize inspection report for analysis by the maintenance manager to determine if
maintenance is required.
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~
MOD UL A R
WETLANDS
Maintenance Indicators
Based upon observations made during inspection , maintenance of the system may be required based
on the following indicators:
• Missing or damaged internal components or cartridges .
• Obstructions in the system or its inlet or outlet.
• Ex cessive accumulation of floatables in the pre-treatment chamber in which the length and
width of the chamber is fully impacted more than 18".
• Excessive accumulation of sediment in the pre-treatment chamber of more than 6" in depth.
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MODU LA !'\
WETLANDS
• Excessive accumulation of sediment on the BioMediaGREEN media housed within the pre-
filter cartridges . The following chart shows photos of the condition of the BioMediaGREEN
contained within the pre-filter cartridges. When media is more than 85% clogged replacement
is required.
New
BioMediaGRE EN
0 %
• Overgrown vegetation.
--Percent Clogged --100%
Exhausted
BioMeciaGREEN
• Water level in discharge chamber during 100% operating capacity (pre-treatment chamber
water level at max height) is lower than the watermark by 20%.
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MO DUL A R
WETLANDS
Inspection Notes
1. Following maintenance and/or inspection, it is recommended the maintenance operator
prepare a maintenance/inspection record . The record should include any maintenance
activities performed, amount and description of debris collected , and condition of the
system and its various filter mechanisms .
2. The owner should keep maintenance/inspection record (s) for a minimum of five years from
the date of maintenance. These records should be made available to the governing
municipality for inspection upon request at any time.
3. Transport all debris , trash , organics and sediments to approved facility for disposal in
accordance with local and state requirements .
4. Entry into chambers may require confined space training based on state and local
regulations .
5 . No fertilizer shall be used in the Biofiltrati on Chamber.
6 . Irrigation should be pro vided as recommended by manufacturer and/or landscape
architect. Amount of irrigation required is dependent on plant species . Some plants may
not require irrigati on after initial establishment.
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MODULAR
WETLANDS
Inspection Notes
1. Following maintenance and/or inspection , it is recommended the maintenance operator
prepare a maintenance/inspection record. The record should include any maintenance
activities performed , amount and description of debris collected , and condition of the
system and its various filter mechanisms.
2. The owner should keep maintenance/inspection record(s) for a minimum of five years from
the date of maintenance. These records should be made available to the governing
municipality for inspection upon request at any time.
3. Transport all debris , trash , organics and sediments to approved facility for disposal in
accordance with local and state requirements .
4 . Entry into chambers may require confined space training based on state and local
regulations .
5 . No fertilizer shall be used in the Biofiltration Chamber.
6 . Irrigation should be provided as recommended by manufacturer and/or landscape
architect. Amount of irrigation required is dependent on plant species. Some plants may
not require irrigation after initial establishment.
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MO D ULAfl.
WETLANDS
Maintenance Summary
o Remove Sediment from Pre-Treatment Chamber -average maintenance interva l is 12 to 24
months.
• ( 10 minute average service time).
o Replace Pre-Filter Ca rtridge Media -average maintenance interva l 12 to 24 months.
• ( 10-15 minute per cartridge average service time).
o Trim Vege tati o n -average maintenance interval is 6 to 12 month s.
• ( Service time varies).
System Diagram
Access to separation chamber
and p re-filter cartridge
Curo Inlet
In dividua l Med ia Filters
Pre ·filter Cartr idge
Vertical Und erdra in
Manifold
\ GioMedio GREEN
"-.
Mi r!ond
MEDI A
,. ....
~.~)Pre-treatment Chamber
_., ... 1-.~
\,3 ) Biofiltration Chamber
/'~
·~~) Discharge Chamber
Drain·Down Line
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rlUJC'\..l Tr .J..V.JV /VU.J
MOD U LAR
Maintenance Overview WETLANDS
The time has come to maintain your Modular Wetland System Linear (MWS Linear). To ensure
successful and efficient maintenance on the system we re commend the following. The MWS Linea r
ca n be maintained by removing the access hatches over the systems various chambers . All
necessary pre-maintenance steps must be carried out before m ai ntenance occurs, especially traffic
control and other safety measures to protect the inspector and near-by pedestrians from any dangers
associated with an open access hatch o r manhole. Once traffic control has been set up per loca l a nd
state regulations a nd access covers h ave been safely o pened the maintenan ce process can begin. It
should be noted that some maintenance activities require confined space entry. All confined space
requirements must be strictly followed before entry into the system. In addition the following is
recommended :
• Prepa re the maintenance form by wri ting in the necessary information including project name,
loca ti on, date & time , unit number and other info (see maintenance form).
• Set up all appropriate safety and cleaning equipment.
• En sure traffic control is set up and properly positioned.
• Prepare a pre-checks (OSHA, safety, confined space entry) are performed.
Maintenance Equipment
Following is a li st of equipment required for maintena n ce of the MWS Linear:
• Modular Wetland Maintenance Form
• Manhole hook or appropriate tool s to access hatc hes and cover s
• Protective clothing, flashlight and eye protection.
• 7/16" open or closed ended wrench .
• Vacuum assisted truck with pressure washer.
• Replacement BioMediaGREEN for Pre-Filter Cartridges if required (order from manufacturer).
~I/
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MODU LA fl.
WETLANDS
Maintenance Steps
1. Pre-treatment Chamber (bo ttom of charmer)
A Remov e access hatch or manhole cov er over pre-treatment chamber and position vacuum
truck accordingly.
B. With a pressure washer spray down pollutants accumulated on walls and pre-filter
cartridges .
C. Vacuum out Pre-Treatment Chamber and remove all accumulated pollutants including
trash , debris and sediments. Be sure to vacuum the floor until pervious pavers are visible
and clean .
D. If Pre-Filter Cartridges require media replacement move onto step 2. If not, replace access
hatch or manhole cover.
Removal of access hatch to gain access below. Insertion of vacuu m hose into separat ion cha mber.
Remova l of trash, se dime nt an d debri s. F ully cleaned separat ion chambe r.
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I
2. Pre-Filte r Cartridg e s (atta ched to wall of pre-treatment chamber)
A. After finis hing step 1 enter pre-treatme nt c hambe r.
B. Unscrew th e two b ol ts holding the lid on each cartridg e filte r and rem ove lid .
--.:::::= ____
.,...,..,., __
I , , ..,. ,::::: ;:: ::: = 1 ~
MO DU L AP,
WETLANDS
Pre-filte r cartridges wrth tops on.
Inside ca rt ridges showing media fiHers ready for
replacement
C . Place the va cuum hose ove r eac h indiv idu al media filte r to suc k out filte r m edia .
Vacuuming out of media fi lters.
D. Once filter media has bee n suc ked u se a press ure wa sh er to s pra y down in sid e of th e
ca rtridg e and it's c ontaining me dia ca ges. Rem ove cl eaned media cag es and place to th e
sid e . Once rem oved the v ac uum hose can b e inserte d into th e ca rtridg e to v acuum o ut any
remaining material near the botto m of th e ca rtridge.
www.modularwetlands.com
MO D U L AR
WETLANDS
E. Reinstall media cages and fill with new media from manufacturer or outside supplier.
Manufacturer w ill provide specification of media and sources to purchase . Utilize the
manufacture provided refilling trey and place on top of cartr idge. Fill trey with new bulk
media and shake down into place. Using your hands slightly compact media into each filter
cage. Once cages are full removed refilling trey and replace cartridge top ensuring bolts
are properly tightened.
Refi ll ing trey for media rep lacement. Refil ling trey on cartrid ge with bulk
media.
F . Exit pre-treatment chamber. Replace access hatch or manhole cover.
3. Biofiltration Chamber (middle vegetated chamber)
A. In general, the biofiltration chamber is maintenance free with the exception of maintaining
the vegetation . Using standard gardening tools properly trim back the vegetation to healthy
levels. The MWS Linear utilizes vegetation similar to surrounding landscape areas
therefore trim vegetation to match surrounding vegetation . If any plants have died replace
plants with new ones:
www.modularwetlands.com
1_
MODULAR
WETLANDS
Inspection Notes
1. Following maintenance and/or inspection, it is recommended the maintenance operator
prepare a maintenance/inspection record. The record should include any maintenance
activities performed, amount and description of debris collected, and condition of the
system and its various filter mechanisms.
2. The owner should keep maintenance/inspection record(s) for a minimum of five years from
the date of maintenance. These records should be made available to the governing
municipality for inspection upon request at any time.
3. Transport all debris, trash, organics and sediments to approved facility for disposal in
accordance with local and state requirements.
4. Entry into chambers may require confined space training based on state and local
regulations.
5. No fertilizer shall be used in the Biofiltration Chamber.
6. Irrigation should be provided as recommended by manufacturer and/or landscape
architect. Amount of irrigation required is dependent on plant species. Some plants may
not require irrigation after initial establishment.
www.modularwetlands.com
Inspection Form
Modular Wetland System, Inc.
P. 760.433-7640
F. 760-433-3176
E. lnfo@modularwetlands.com
www.modularwetlands.com
f\
~
MODULAR
WETLANDS
Inspection Report
Modular Wetlands System
0
JI;:_.
,.., 0 I".> u l 11, t\
WETLANDS
Project Name For Office Use Only
Project Address
(ct,) (Zip Cede) (Re'il8N8d By)
OM1er I Management Company
'\U .. )
Contact Phone ( )
Office personnel to c0"1)1ete 88ctlan to
-the left.
Inspector Name ---------------------Date Time -~~~~~AM/PM
Type of Inspection D Routine D Follow Up D Complaint D Storm Storm Event in Last 72-hours? D Na O Yes
\Neather Condition Additional Notes
Inspection Checklist
Modular Welland System Type (Curb. Grate orUG Vault): Size (22', 14' or etc.):
Structural Integrity: Yes No Comments
Damage to pre-treatment access cover (manhole cover/grate) or cannot be opened using normal !iftmg
pressure?
Damage to discharge chamber access cover (manhole cover/grate) or cannot be opened using normal lifting
pressure?
Does the MWS unit show signs of structural detenorat1on (cracks 1n the wall, damage to frame)?
Is the inleVoutlet pipe or drain do~ pipe damaged or otherwise nat functioning properly?
Working Condfflon:
Is there evidence of ill1crt: discharge or excessive ml, grease, or other automobile fluids entering and clogging th
unit?
Is there standing water in inappropriate areas after a dry period?
Is the filter insert (if applicable) at capacity and/or is there an accumulation of debris/trash on the shelf system?
Does the depth of sediment/trash/debris suggest a blockage of the inflow pipe, bypass or cartridge filter? If yes Dei:th
speafywtlich one in the comments section. Note depth of accurrulatian in in pre-treatment chamber.
Does the cartridge filter media need replacement in pre-treatment chamber and/or diseharge chamber?
Chamber.
Any signs of improper functioning in the discharge chamber? Note issues in comments section.
OU.er Inspection Items:
Is there an accumulabon of sedirrentltrash/debris 1n the wetland rredia (if applicable)?
Is it evident that the plants are alive and healthy (if applicable)? Please note Plant Information below.
Is there a septic or foul odor coning from inside the system?
Waste: Yes No Recommended Maintenance Plant Information
Sediment !Silt f Clay No Cleaning Needed
Damane to Plants
Trash /Bags/ Bottles Schedule Maintenance as Planned
Plant Renlacernent
Green Waste/ Leaves/ Foliage Needs lmrrediate Maintenance
Plant Trimminn
Additional Notes:
2972 San Luis Rey Raad, Oceanside, CA 92058 P (760) 433-7640 F (760)433-3176
Maintenance Report
Modular Wetland System, Inc.
P. 760.433-7640
F. 760-433-3176
E.lnfo@modularwetlands.com
-.modularwetlands.com
MODULAR
WETLANDS
Firestone Complete Auto Care Technical Information Report Renton, Washington
Cleaning and Maintenance Report
Modular Wetlands System
Project Name-------------------------------------Foc Office Use Only
ProjectAddress ------------------------------------b------------< [city) (Zip Cod&) ~ewed9y)
owner /Management Company--------------------------------1n,...,----,.,...-,----,
Coo~ct--------------------
Inspector Name -----------------
Type of lnspecti171 D Routine D Follow Up D Complaint
Weather Condition
Site GPS Coordinates Manufacturer I Trash
Map# of Insert Description I Sizing Accum!Jatirxi
Lat: MWS
Catch Basins
Lon":
MWS
Sedimentation
Basin
Media Filter
Condition
Plant Condition
Drain Down Media ..
Condition
Discharge Chamber
Condition
Drain Down Pipe
Condition
Inlet and Outlet
Pipe Condition
Comments:
Phone (
Date
D Storm
Addi1ional Notes
FOiiage Sediment
Accumulation ACOJmulation
Time
Offir:e pet10ll!lel lo eomp1,1, netlon 10
1he ien.
______ AM/PM
Storm Event in Last 72~hours? D No D Yes
Condition of Media Operational Per
Total Delxis 25/50/75/100 Manufactures'
Aca..imulation (will be changed Specifications
@75%) (If not, why?)
2972 SM Luis Rey Road, Oceanside, CA 92058 P. 700.433.7640 F. 760.433.3176
Firestone Complete Auto Care Technical Information Report Renton, Washington
Appendix E -Water Quality Department of Ecology
Certification
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
±9 .,....
•I S-,1 L " 1 \ i.'c'oTo, r
December 2015
GE:'l'ERAL USE LEVEL DESIGNATION FOR BASIC, ENHANCED, AND
PHOSPHORUS TREATMENT
For the
MWS-Linear Modular Wetland
Ecology's Decision:
Based on Modular Wetland Systems! Inc. application submissions, including the Technical
Evaluation Report, dated April I, 2014, Ecology hereby issues the following use level
designation:
I. General use level designation (GULD) for the MWS-Lincar Modular Wetland Stormwatcr
Treatment System for Basic treatment
• Sized at a hydraulic loading rate of I gallon per minute (gpm) per square foot (sq ft) of
wetland cell surface area. For moderate pollutant loading rates (low to medium density
residential basins), si7.e the Prefilters at 3.0 gpm/sq fl of cartridge surface area. for high
loading rates (commercial and industrial basins), size the Prefillers at 2.1 gpmlsq ft of
cartridge surface area.
2. General use level designation (GULD) for the MWS-Linear Modular Wetland Stormwater
Treatment System for Phosphorus treatment
• Sized at a hydraulic loading rate of I gallon per minute (gpm) per square foot (sq ft) of
wetland cell surface area. For modcmte pollutant loading rates (low to medium density
residential basins), size the Prefilters at 3.0 gpmlsq ft of cartridge surface area. For high
loading rates ( commercial and industrial basins), size the Pre filters at 2.1 gpm/sq ft of
cartridge surface area.
3. General use level designation (GULD) for the MWS-Linear Modular Wetland Stormwater
Treatment System for Enhanced treatment
• Sized at a hydraulic loading rate of I gallon per minute (gpm) per square foot (sq ft) of
wetland cell surface area. For moderate pollutant loading rates (low to medium density
residential basins), size the Prefilters at 3.0 gpmlsq ft of cartridge surface area. For high
loading rates (commercial and industrial basins), size the Prefilters at 2.1 gpm/sq ft of
cartridge surface area.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
4. Ecology approves the MWS • Linear Modular Wetland Stormwater Treatment System units
for Basic, Phos.phoms, and Enhanced treatment at lhe hydraulic loading rate listed above.
Designers shall calculate the water quality design flow rates using the following procedures:
• Western Washington: For treatment installed upstream of detention or retention, the
water quality design flow rate is the peak 15-minute flow rate as calculated using the
latest version of 1hc Western Washington Hydrology Model or other Ecology-approved
continuous runoff model.
• Eastern Washington: For lrcatment installed upstream of dctcnlion or retention, the
water quality design flow rate is the peak 15-minute flow rate as calculated using one of
the three methods described in Chapter 2.2.5 of the Stom1water Management Manual
for Eastern Washington (SWMMEW) or local manual.
• Entire State: For treatment installed downstream of detention. the water quality design
!low rote is the 1\111 2-ycar release rate of the detention facility.
5. These use level designations have no expiration date but may be revoked or amended by
Ecology, and arc subject to the conditions specified below.
Ecologfs Conditions of Usei
Applicants shall comply with the following conditions:
I. Design, assemble, install, operate, and maintain the MWS ,~ Linear Modular Wetland
Stom1water Treatment System units, in accordance with Modular \Vetland Systems. lnc.
applicable manuals and documents and the Ecology Decision.
2. Each site phm rnust undergo Modular Wetland Systems, Inc. review and approval before
site installation. This ensures that site grading and slope are appropriate for use of a MWS
Linear Modular Wetland Stormwatcr Treatment System unit.
3. M\VS -Linear Modular Wetland Stormwater Treatment System media shall confonn to the
specifications submitted to, and approved by, Ecology.
4. The applicant les.ted the MWS -Linear Modular Wetland Stonnwater Treatment System
with an external bypass weir. This weir limited the depth of water flowing through the
media, and therefore the active treatment area, to below the root zone of the plants. This
GULD applies to MWS -Linear Modular Wetland Stormwater Treatment Systems whether
plants arc included in the final product or not.
5. Maintenance: The required maintenance interval for slonnwater treatment devices is often
dependent upon the degree of pollutant loading from a particular drainage basin. Therefore,
Ecology docs not endorse or recommend a "one size fits all" maintenance cycle for a
particular model/size of manufactured filter treatment device.
• Typically, Modular Wetland Systems, Inc. designs MWS -Linear Modular Wetland
systems for a target prefilter media life of6 to 12 months.
• Indications of the need for maintenance indudc cfTiucnt flow dcercasing to below the
design flow rate or decrease in treatment below required levels.
• 0\.Vtl.ers/operators must inspect MWS -Linear Modular Wetland -systems for a minimum
of twelve months from the start of post-construction operation to determine site-specific
PACLAN D Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
maintenance schedules and requirements. You must conduct inspections monthly during
the wet season, and every other monlh during the dry season. ( According to the
SWMMWW, the wet season in western Washington is October I to April 30. According
to SWMMEW, the wet season in eastern Washington is October l to June 30). After the
first year of operation, owners/operators must conduct inspe<.:tions based on the findings
during the first year of inspections.
• Conduct inspections by qualified personnel, follow manufacturer's guidelines. and use
methods capable of determin..ing either a decrease in treated effluent flo,.vrate and/or a
decrease in pollutant removal ability.
• When inspections arc pcrfonncd, the fol1owing findings typically serve as maintenance
triggers:
• Standing water remains in the vault between rain events, or
• Bypass occ.-urs during stom1s smaller than the design storm.
• If excessive floatables (trash and debris) arc present {but no standing water or
excessive sedimentation), perfonn a minor maintenance consisting of gross solids
removal. not prefilter media replacement.
• Additional data collection will be used to create a correlation between pretreatment
chamber sediment depth and pre-filter clogging (see Issues to be Addressed by the
Company section below)
6. Discharges from the MWS -Linear Modular Wetland Stormwatcr Treatment System units
shall not cause or contribute to water quality standards violations in receiving waters.
Applicant:
Applicant's A<ldress:
Application Documents:
Modular Welland Systems. Inc.
PO. Box 869
Oceanside. CA 92054
• Original Applic-t1tio11 for Conditional [}l'e Lend De.'>ig11ati01r. Modular \Vetland System,
Linear Stormwater Filtration System Modular Wetland Syslems. Inc., January 2011
• Quality Assurance Project Plan: Modular Wetland system -Linear Treatment System
performance Monitoring Project, draft, January 2011.
• Rfi1fsed Application /Or Conditional Ure Lnel Designation, Modular Wetland System,
Linear Stormwater Filtration System Modular Wetland Systemi:;, Inc., May 20I l
• Afemonrndum: Modular Wetland .5,)·stem-Linrtar GULD Applirntio11 Supplt•m<!ntm·y Data.
Ap1tl 21//4
• Ti."d1nical Evaluation Report: Modular JVi:rland Spilem Stomnmter Tre,llment System
PetjOrmancf! Monitoring, April 2014.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
Applic.ant's l;se Lr,'el Request:
General lt;';C level designation as a Basic, Enhanced, :md Phm;phoms treatment device i11
accordance wilh Ecology's Guidance for EYaluating Emerging Shmnwater Treatmc11t
Te-chnologies Technology A:q;.e::,s1nent Protocol -Ecology (TAPF) January 201 J Revision.
Applkani1 s Performance Claims:
• The :'v1WS -Linear Modular wetland is capable of removing a minimum of XO-percent
ofTSS from stormwatcr with influent concentrations. between 100 and 200 mg.ii.
• The ~fWS -Linear /\,fodular ~··etland is capable of removing a minimum of SO-percent
of Total Phos.phorus from stormwatcr with influent conccmrntions between 0. I .and 0.5
mg/I.
• The :\-1WS --Linear Mo<lular wetland is capable of removing a minimum of 30-pcrcl'.nt
of diss.olve<l Copper from s.Lmmwatcr with intllicnt concentrations between 0.005 and
0.020 rngil.
• The M\VS -Li11ear Mo<lul.ir wetland is. capable nfrcmoving a minimum of60-pen:ent
of dissolved Zinc from stormwater with influent concentrations between 0.02 .and O.JO
mg.ii.
Ecology Recommendations:
• Nlmlular \Vi.:tland Systems. Inc. has shown Ecology, through laboratory <Jnd ficl<l-
testing, that the M\VS -linear Modular \Vetland Stormwater Treatment System filter
s.ystem is capable of attaining Ecology's Basic. Total phosphorns, rrnd Enhanced
treatment goals.
Findings or Fact:
Laboratory Testing
The MWS-Lincar Modular wetland has the:
• Capability to-removt: 99 percent of tota.l suspended solids (using Sil-Co-Sil 106) in <.1
quarter-scale mode! with innuent concentrations. of 270 mg.IL
• Capability to remove 91 pcrecnl of total suspcndc<l solids (using Si[.('o.Si l I 06) in
laboratory c:onditions with influent concentn,tiom of 84.6 mg/Lat a flm:v rate of 3.0
gpm per square foot of media.
• Capability to remo\'e 93 percent of dis.s.olved Copper in a qu.artcr-s.ca\e model with
influent concenrrations of0.757 rng/L
• Capability to remove 79 percent of dis.solved Copper in laboratory conditions with
influent concentrations of0.567 mg/Lal a flow .-ate ofJ.0 gpm per square foot of
media.
• Capability to remove 80.5-percent of dissolved Zinc in a qua1ter-scale model with
influent concentrations of0.95 mg/Lat a flow rate o-f3.0 gpm per square foot of media.
• Capability to remove 78-percenl of dissolved Zinc in laboratory conditions with influent
concentrations of 0. 75 rng/L at a flow rate of 3.0 gpm pc-r square foot of media.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Field Testing
• :V1odular Wetlm,d Systems. Inc. conducted monitoring ofan MWS-Linear (Model
# M\VS-L-4-13} from April 2012 through May 20l3. al a transportation mainlcnance
fi.n .. ·iliry in Portland, Oregon. The munnfocturer collected .flm.v-weighted composite
samples of the system ·s influent and effluent during 28 separate stonn e\·ent:s. The
system treated approximately 75 percent of the mnoff from 53.5 inches or rainfall
during the monitoring period. The applicant .~izcd the system at 1 gpm/sq ft. (wetland
media) and 3gpm/sq ft. (prefilter).
• Influent TSS concentrations for qualifying sampled storm events ranged from 20 to 339
mgiL. Average TSS removal for influent concentrations greater than 100 mg/L {n;:::;7)
averaged 85 percent. For influent conccntrallons in the range of 20~ 100 mg/L {n=l 8),
the upper 95 percent confidence inten:a) about the mean etlluenl concentration was
12.8 mgiL.
• Total phosphorus removal for 17 events \i,,·ith influent TP concentrations in the range of
0.1 10 0.5 mg/L averaged 6:5 percent. A bootstrap estimate or the lower 95 percent
confidence limit (LCL95) of the mean total phosphorus reduction ·was 58 percent
• TI1c lower 95 pcrcc-nl confidence limit ofd1c mean percent removal was 60.5 percent for
dissolved zinc frir illflucnl concentrations in the range of0.02 to 0.3 mg/L (n-11).
TI1e lower 95 percent confidence limit ofrhe mean percent removal was 32.5 percent for
tllssol\'cd copper for influent concentrations in the range of 0.005 to 0.02 mg/L (n= 14}
al flo\V rates up to 2X. gpm (design flow rate 41 gpm}. Laboratory test data augmented
Ihc data set. showing dissolved copper removal at the design tlo\v rate of 41 gpm (93
percent reduction in innuent dissolved copper of 0. 757 mg/L).
Issues to be addressed by the Company:
I. Modular Wetland Sys.terns, Inc. should collect maintenance and irn.pecllon data for the
first year on all installations in the Northwest in order to assess standard maintenance
rec1uiremtnts for various land uses. in the region. Modular Wetland Systems, 1nc. shouic.l
use these data to establish rcqull'cd maintenance cycles.
2. Modular Wetland Systems, Inc. should collect prc-trc-atmcnt chamber sediment depth
data for the first year of operation for all installations in the Northwest. Modular
Wetland Systems, Inc. will use these data to ere.are a correlation between sediment depth
anti pre-filter clogging:.
TechnologJ Description:
DO\vnload at http://wv.,'w.modular\vctfon<ls..com/
Contact Information:
Applicant: Greg Kent
Modular Wetland Sys.terns, Inc.
P.O. Box 869
Oceanside, CA 92054
g k l!n r!f.I', hiocl ea neuvi ran mental. 11 et
Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Applicant website: http:., ··wv,:w.mudtilanvetlands.comi
Ecology web link: hltff1 iwww.ecy.wa gn\·/prqgram.;:\i..·0 -'s.tormwater 1 newtechiindex.html
Ecology:
Revision Histon
Date
June 201 l
September 2{) 12
January 20 l 3
11ec:ember 2013
April 2014
December 2015
Douglas C. Howie. P.E.
Dcpartmcn1 of Ecology
\Vater Quality Program
(31,0) 407-6444
do11gbs.howida ccv. 1,v.a. gov
Revision
Ollginal use-level-design<.1tion document
Rcvis.cd dates for TER and expiration
Modified Design Stom1 Description. ;l(\ded Revision Table. sidded
maintenance discus!'iion. rno<lilied format in acconlance \Vith Ecology
slandard
Updated name of Applicant
Appro\·ed GULD designation for Ila~ic. Phospborns. tllld Enhanced
tn:atmcnt
Updated GULD to document the acceptance ufMWS~Lmcar
Modular \.\'etland installations with or without the indusion of plant.,.
Project #10507003
'
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Appendix F -Geotechnical Reports
(Presented Without Appendices)
Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND Project #10507003
". ....
Firestone Complete Auto Care Technical Information Report
PACLAND
GEOTECHNICAL ENGINEERING REPORT
Firestone Retail Store
17808 108th Ave SE
Renton, WA 98055
PSI PROJECT N0.07121375
June 1, 2016
Prepared for:
Bridgestone Retail Operations. LLC
333 E. Lake Street
Bloomingdale, IL 60108
Prepared by:
Professional Service Industries, Inc.
20508 -56'" Ave W, Suite A
Lynnwood, WA 98036
Project #10507003
Renton, Washington
l •JI11Jomu11io11
• 7h Build 011 .... ,., .. ,.,,11 • Conauffing • Tetlfmv
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
l iJ I n/i m 11a Ii 011
• 1i1BuildOn
lingJneerlng • CQMl.lltJng • TEJ!rtlf>9
J,,,,e : 2016
Grijgestone Retail Opera11::,.ns LLC
333 ~ 1 ake Street
Btoorr.mgoae. IL S0108
ATTENTION:
Subject:
I )enn1s A0say
Ema•' .!1risa;1Dennis@cfusa corr
Geotechnical Investigation
Firestone Retail Store
17808 108th Ave SE,
Renton, Washington
PSI Report No. 07121375
:.iro~ess or-a! Service !nd..,s~r es. 'nc (PSI) 1s pieased to sLnmi: a ret.nrt c;f our ge0tecr1mcal
•nves:·gaticn :er fl'e l)!oposed FifeS~·'.>ne Retai· Store to :::e 1ocated ai 17808 108'-" Ave SE m Ren:on
\.Vash1ngto1. Ths report su·n11arizes the wor'K accomplished a11d orov1des o.Jr ~ecomIT'e~dations
for des1gn and constcJct1on af t!"'.e pr::iposed prc;ect PSI perforT.ed the reqJested geo1eclr cai
1"vesttgat on services 1n gener;Jl ac:co~dance \'./Ith the consutart agieernen: dated M;:iy 2. 2015
Gaseo on the res.}ts of o:.;r '1e d 1n..-esllgat1on, laooratory les1ing 21rd eng neenng ana,;-'S1S the
proposed site is sL1tarne fo' ;lie cons;ructio11 of the procosed unpro~ements fro·r1 a geotec:hrucal
standpoint prov:ded the recomrr.ePdat•ons o• this report -ti:e followed . .;:eco'n:"1endat1ons
'egard1ng ~he geotechrical aspects of p<a;ec: design and ccnstrL~ton a"e presented 1'1 the
attached report
PS! appreci~1tes :he opportuni'.y to con:ribute our services and eeks for:.ard to working with you
dun~g :iesign and construct1cn c' tn1s prc1ar:t P1ease c~ntact the :.nde"S·gned d1~er.tly •f ;'Ol, l1ave
quest ons pertaining to tlrs p'.'oJect
Resccc:-'ul!y S:..t:mir.:ed
PROFESSIONAL SERVICE INDUSTRIES. INC,
,, .
t/ tt .~<-fA,.)~ :-;:\~.'.,,-':'.,,A,.,,,,_::_-;h:, ;'..~:,.
Richard C i::reonc,;sen L G L E:: G
P~oJect Geok)g•st
r2,,~~a_r-~;.::~9T .. :~'.':.~.§.~-'Clt: s:usa :er:_:·
','!T~'; -,·1
Project #10507003
· bf 9.:7-,,
.\l:1ct1ael S ;::,1aceP.E::
?nnc1pa! CorSt;ltart
r_21_C_'.1_~-~!J~i?.~t:':-[5:PS'\,32 (;(;'~I
Firestone Complete Auto Care
~""'''/""~ Rrr,ril St,,n:·
/':sr,.1· f,11'' _/,,·SD. R,-,,1"11. ll'<1,IJ111::,·"11
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Technical Information Report
1. PROJECT DESCRIPTION
Renton, Washington
/'m/'r:1."11,,,~I Sn,·i«-lmlu~trit"'-, lrsc
fn;i11,·ai11;: • ,;,,1,·,,/1,.ng • T<,w1;:_
Ju1t, !. :au,
;,.,,,_,.1 .. 1'
PSI understands the site improvements will consist of a new single story retail facili1Y and expanded
parking. Based on preliminary structural information provided and previous experience with similar
projects, we anticipate column and wall loads be on the order of 30 kips and 3 kips per foot, respectively.
We also anticipate design floor loads of about 125 psf with a maximum concentrated load of 8 kips.
2. SITE DESCRIPTION
2.1. General
The proposed site is located at 17808108th Ave SE in Renton, Washington. Based on teadily available
aerial images the site presently has a single story bullding, which we understand will be razed prior to
construction. The remainder of the site has sporadic landscaped shrubbery and paved parking. The site
is bordered to the west by 1081h Ave SE (State Route 515), to the east by 109111 Ave SE, and to the north
and south by existing developments.
2.2. Topography
Our review of available topographic information indicates that the proposed site is relatively flat with
elevations ranging from approximately EL400 to EL410 from east to west over a distance of approximately
300 feet based on available aerlal imagery on Google Earth.
2.3. Geology
Based on a review of the geology of the region utilizing the Washington Department of Natural Recourses
Interactive Geologic Map (WDNRIGM), PSI observed that this area is mapped as Quaternary glacial till.
Glacial till is typically silts sand and gravels that have been overridden by a glacier and are thereby hea\lily
over-consolidated.
2.4. Seismic Design Values
The nearest mapped fault zone to the site is the Seattle Fault Zone approximately 5 miles northwest of the
site. The Seattle Fault Zone is mapped as a Holocene age thrust faults that trend east to west with a
reported slip rate of 0.2 to 1 mm per year (Reference 2).
The contribution of potential earthquake-induced ground motion from known sources is included in the
probabilistic ground motion maps published by the USGS. Design data regarding seismic site
characterization and design recommendations based on USGS mapping and analysis are implemented in
the 2012 International Building Code. Based on the SPT data coflected during our drilling, the site
conforms to the characteristics of Site Class C. The published design ground motion values. based on the
USGS Seismic Design Maps (Reference 3), corresponding to a risk-targeted 2 percent probability of
exceedance in 50 years at the project site. Seismic design values for the project site are provided in Table
1 below.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report
~·,,.,.,1mwJ/.d,t1!Sr,,11.·
l"~'/J,\ {1{11;" 1<v5[, k,~,r.m Ww/Ji1r~',,>1<
PSI p,..,;,·.-.r X,., 1171 :!l J73
Table 1: Ground Motion Values*
Mapped MCE Adjusted MCE
Period Spectral Site Spectral
(sec) Response Coefficients Response
Acceleration Acceleration
(g) (g)
0.2 S, 1.395 F, 1.000 S,.t~ 1.392
1 .0 S, 0.519 F, uoo S.vr 0.674
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Design
Spectral
Response
Acceleration
(g)
So, 0.928
SD, 0.450
R1sJc Targeted 2% Proba-bNty of faceedance in 50 yett1s for Latitude 47.44309 and Long,tude -122. 19836
2.5. Subsurface conditions
Subsurface materials and conditions were investigated with nine hollow-stem auger borings performed on
May 16•, 2016. The nine borings were drilled to a depth of approximately 11 to 21 feet below the ground
surface. The approximate locations of the soil borings are shown on Figure 2. In general, the soils under
the proposed building areas generally consist of loose to medium dense silty sands fill soils over medium
dense to very dense glacial till soils. A descriplfon of our field investigation, and our boring logs, are
available in Append]>!: A. A description of the laboratory testing program along with sample test results are
available in Appendix B. The terms used to describe material encountered in the boring are defined in the
General Notes. A description of the soils as they were encountered from the ground surface is provided
below.
1. FILL: The fill generally consisted of silty sands. The fill was observed in all borings. N-Values in
the silty sand fill soils ranged from 3 to 25 blows per foot to indicate relative densities of loose to medium
dense. Moisture contents of the fill soils range from 15 percent to 20 percent
2. WEATHERED TILL: The weathered till deposits consisted of light brown to dark brown with orange
mottling, silty sand and silt with sand soils. Weathered till was observed in all borings. N-Values ranged
from 22 to 72 blows per foot in the silty sand soils to indicate relative densities of medium dense to very
dense. Moisture contents in the silty sand soils range from 13 percent to 18 percent.
3. TILL: The till deposits consisted of gray silty sand soils and were observed in alf borings except
B-1 and 8-2. N-Values ranged from 50 blows for 2 Inches to 50 blows for 6 inches to indicate a relative
density of very dense. Moisture contents of the till range from 9 percent to 20 percent.
2.6. Groundwater
Static groundwater was not encountered at the boring locations at the time of our field investigation; however,
PSI believes that small amounts of perched water was observed in borings B-3 and B-4. This perched water
was observed within sand lenses within the till soils and may be present in other portions of the site seasonally
or after significant precipitation events.
3. CONCLUSIONS AND RECOMMENDATIONS
3.1. General
Subsurface explorations for this investigation indicate the presence of as much as 31;; to 51.1.i feet of fill overlying
glacially consolidated soils across the entire site. It ls PSl's opinion that the onsite soils are sujt;able to support
conventional spread footings provided the recommendations stated below are followed.
PACLAND Project #10507003
Firestone Complete Auto Care
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3.2. Site Preparation
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We anticipate that the removal of existing structures, foundations and utilities will likely disturb the upper 3% to
5)'j feet of soils in the northern portion of lhe site. Any large debris encountered below proposed new buildings
should be removed.
3.3. Structural Fill
All fill placed beneath foundation elements, sidewalk, and pavement areas should be placed as compacted
structural fill. We recommend that structural fill extends at least 2 feet beyond building and pavemenl limits
where nearby structures do not restrict fill placement. On-site soils, in lieu of organic matters or other
deleterious materials can be reused for backfill purposes, provided the material can obtain moisture
contents that will allow it to meet compaction requirements. Imported material, if required, should be
approved by the geotechnical engineer. Compacted fill should be placed in 12-inch-thick lifts (loose) by
heavy compactors such as large vibratory rollers and hoe-packs and in 6 inch loose lists for smaller
compactors such as small plate compactors and jumping jacks, These soil should be moisture-conditioned
to within 2 percent of the optimum moisture content, and compacted to a density of 95% of the maximum
dry density as determined by ASTM D 1557.
The condition of the subgrade should be evaluated by a PSI representative before fill placement or
construction begins. Fill compaction should be evaluated by in-place density tests performed during fill
placement so that adequacy of soil compaction efforts may be evaluated as earthwork progresses. When
fill materfal is inconsistent or when more than 30% of the fill materlal is retained on a ~ inch sieve, fill
placement should be observed and compaction evaluated by observation of a proof-roll using a loaded
tandem axle dump truck.
lf Imported fill materials area required PSI recommends they consist of granular material such as pit-run
or quarry-run rock, crushed rock, crushed gravel, or sand. They should be fairly well-graded between
coarse and fine material with a maximum particle size of 2 inches and should have less than 5 percent by
weight passing the U.S. Standard No. 200 Sieve.
3.4. Utility Trench Excavations and Backfill
Excavations should be made in accordance with applicable Federal and State Occupational Safety and
Health Administration regulations. Utllity trenches in the near surface sand soils at the site will need to be
sloped, or shored from the ground surface due to the potential for caving. Actual inclinations will ultimately
depend on the soi! conditions encountered during earthwork. While we may provide certain approaches
for trench excavations, the contractor should be responsible for selecting the excavation technique,
monitoting the trench excavations for safety, and providing shoring, as required, to protect personnel and
adjacent improvements. The information provided below is for use by the owner and englneer and should
not be interpreted to mean that PSI is assuming responsibWty for the contractor's actions or site safety.
The fill and soft silty soils PSI encountered onsite should be considered Type C soils. Dense or hard native
soils can be classrfied as Type B soil according to the most recent OSHA regulations. In our opinion.
ex,cavations should be safely sloped or shored. The contractor should be aware that excavation and
shoring should conform to the requirements specified in the applicable local. state, and federal safety
regulations, such as OSHA Health and Safety Standards for Excavations, 29 CFR Part 1926, or successor
regulations. We understand that such regulations are being strictly enforced, and if not followed, the
contractor may be liable for substantial penalties.
PACLAND Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
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Excavation and construction operations may expose the on~site soils to inclement weather conditions. The
stability of exposed soils may deteriorate due lo a change in moisture content or the action of heavy or
repeated construction traffic. Accordingly, foundation and pavement area excavations should be protected
from the elements and from the action of repetitive or heavy construction loadings.
Utilities trenches within the building, pavement. and sidewalk areas should be backfilled with structural fill
and compacted in accordance with lhe recommendation in section 3.3 of this report with the exception of
fill soils placed immediately around and above the first foot vertically around utility lines which should be
compacted to at least 90% of the maximum dry density as determined by ASTM D 1557. Compaction by
jetting or flooding should not be permitted.
3.5. Foundations
PSI has provided two options for the potential foundation subgrade preparation which are listed below.
Option 1:
Footing subgrades should be over·excavated a minimum of two feet and have the soil in the base of the
trenches compacted to a firm and unyielding state as determined by the geotechnical engineer, then the
removed soil should either be recompacted as structural fill back into the over·excavated area or should
replaced with imported structural fill, place in accordance with the recommendations in Section 3.3 of this
report. The over-excavation and backfill areas should extend at least 2 feet beyond the edge of the footings
or a distance equlva!ent to the depth of lhe over~excavaUon, w'hichever is greater. Provided these foundation
subgrades are prepared in this way the building may be supported by shallow spread footings with an
allowable bearing pressure of up to 3,000 pounds per square foot (psi). This value applies to the total of dead
load and/or frequently applied live load and can be increased by one-third for the total of all loads; dead, live
and wind or seismic.
Option 2:
Footing may be excavated extending to dense native glacial till soils lhat were observed from 3!4 lo 5!4 feel
below existing site grades. Footings extending down to these dense native soils may be designed with an
allowable bearing capacity of 5,000 psf. This value applies to the total of dead load and/or frequently applied
live load and can be increased by one-third for the total of all loads; dead, live and wind or seismic.
Regardless of the option se1ected All footings should have a minimum 18 inches of embedment below the
lowest adjacent final grade for frost protection and all footing subgrades should be prepared in the same
manner across the site. Perimeter and spread footing should be at least 18 inches and 24 inches wide
respectively.
Horizontal forces can be resisted partially or completely by frictional forces developed between the base of the
spread footings. The total shearing resislance between the foundation footprint and lhe soil should be taken
as the normal force. i.e., the sum of all vertical forces (dead lood plus real live load) times the coefficient of
friction between the soil and the base of the footing. We recommend assuming an ultimate coefficient of friction
value of 0.30 for design. If additional lateral resistance is required, passive earth pressures against embedded
footings or walls can be computed using a pressure based on an equivalent fluid with a unit weight of 250
pounds per cubic foot. This value assumes that backfill around footings will be placed as granular structural
fill.
PACLAND Project #10507003
Firestone Complete Auto Care
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3.6. Settlement
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The building foundation loads, and floor live loads will all cause settlement due to consolidation, or compression,
of the underlying soils. The subsurface information and laboratory tesl data developed for this study was used
to estimate settlement beneath these loads. We have assumed that the maximum wall and column loads will
be-3 kips per foot and 30 kips for the purpose of this analyses on both foundation options.
We estimate that the settlement of a typically loaded, isolated column footing designed in accordance with our
previously recommended allowable bearing pressure of 5,000 psf on dense native soil will be less than 1 inch,
additionally we estimate that settlement for 3,000 psf footings, founded on 2 feet of structural fill, will be less
than 1 inch. These esUmates assume that the load on the footings are real dead load and sustained or long-
term live load. Lessef actual bearing pressufeS will produce less settlement. Some differential settlement
between footings should be expected due to differences in their size and loading conditions and the variability
in subsurfaoe conditions across the building footprint. Differential settlements are difficult to quantify; however,
we anticipate they will likely be limited to less than about one half of the total settlement or less than h: inch for
both foundation options along a 40Mfoot span. Settlement of the footings is also expected to occur rapidly,
essentially as the new structural loads are placed and shortly thereafter. Footing settlements will be in addition
to areal settlements due to floor live, or storage loads. For this reason, we recommend that floors, walls and
columns be designed to move independently of each other.
3.7. Floor Support
PSI recommends that soil subgrades below the slab he compacted to a firm and unyielding state.
Compaction of in these areas should be confirmed with a proof rolled with a loaded tandem axel dump
truck, or be observed by the geotechnical engineer or their representative to be firm and unyielding, We
further recommend the installation of a 6-inch thick granular base course beneath lhe floor slab to provide
uniform support and a capillary break between the slab and the subgrade soil. The base course should
consist of crushed rock with particles no larger than 1-inch size and having less than about 2% passing
the No. 200 sieve (washed analysis). Crushed rock 3,4 to % inch gradation is often used for this purpose.
The base course material should be installed in a single lift and compacted to at least 95°/o of the maximum
density as determined by ASTM D 1557 or to a firm and unyielding state. In our opinion, it is appropriate
to assume a coefficient of subgrade reaction, k, of 250 pound per cubic inch for the design of floor slabs
constructed as recommended above. It may also be appropriate to install a vaporMretarding membrane
beneath s!abs that will receive floor coverings or will be used to store moisture-sensitive materials. The
membrane should be installed in accordance with manufacturer's recommendations.
3.8. Drainage
We recommen-d footing drains be placed around the exterior of the building foundation to reduce the potential
for lateral migration of moisture into the build!ng envelope. We recommend that all roof drains be connected
to a tight-line pipe leading to storm drain racilities. Pavement surfaces and open space areas should be sloped
such that surface water runoff is collected and routed to suitable discharge points. We also recommend that
groUnd surfaces adjacent to buildings be sloped to facilitate positive drainage away from the buildings.
3.9. Pavement
For automobile parking areas founded on silly sand fill soi!, we recommend a pavement section consisting
of 2% inches of asphaltic concrete (AC) over 4 Inches of crushed rock base (CRB) or 4 inches of Portland
Cement Concrete (PCC) over 4 inches of crushed rock base. If semi4rucks, or other heavy equipment is
PACLAND Project #10507003
Firestone Complete Auto Care
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expected on paved areas, the pavement section should consist of 4 inches of AC over 6 inches of CRB or
5 inches of PCC over 6 inches of CRB.
These preliminary pavement sections are based on a pavement design using the site sand subgrade, a
desired pavement life of 20 years, and a terminal serviceability index of 2.0. These estimates should be
revised once design traffic information is developed.
These recommended pavement sections are also based on the assumption that the subgrade consists of
firm, undisturbed soil or structural fill and that the pavement wil! be constructed during the dry summer
months. Proofrolling should be used to evaluate pavement subgrade. Any soft areas disclosed by
proofrolling wm like!y require over~excavation and replacement with structural fill. Some contingency
should be provided for the repair of any soft areas.
Permanent, properly installed drainage is also an essential aspect of pavement design and construction.
All paved areas should have positive drainage to prevent ponding of surface water and saturation of the
base course. This is particularly important in cut sections or at low poinls within the paved areas, such as
in sunken loading dock areas or around stormwater catch basins. Effective means to prevent saturation
of the base course including installing subdrain systems below sunken loading docks and weep holes in
the sidewalls to catch basins.
3.10. Stormwater
Based on previous experience-on glacial till sites PSI does not believe that infiltration of site stormwater
will be practical. Glacial till soil in this region typically provide infiltration rates of less than one inch per
hour and very often less than ~ inch per hour.
4. DESIGN REVIEW AND CONSTRUCTION MONITORING
We welcome the opportunity to review and discuss construction plans and specifications as they are being
developed. We are of the opinion that to observe compliance with the design concepts, specifications,
and recommendations, construction operations dealing with earthwork and foundations should be
observed by a qualified geotechnical engineer. We would be pleased to provide these services to you.
5. REPORT LIMITATIONS
The recommendations submitted in this report are based on the subsurface information obtained by PSI
and design details furnished by representatives. of the client, Bridgestone Retail Operations LLC., for the
proposed improvements at 17808 1 Q8lh Avenue SE in Renton, Washington. If there are any revisions to
the plans for this project, or if deviations from the subsurface conditions noted in this report are encountered
during construction, PSI should be notified immediately to determine if changes in the foundation and/or
pavement recommendations are required. If PSI is not retained to review these changes, PSI will not be
responsible for the impact of those conditions on the project.
After the plans and specifications are more complete, PSI should be retalned and provided the opportunity
to review the final design plans and specifications to verify thal our engineering recommendations have
been properly incorporated into the design.
PACLAND Project #10507003
Firestone Complete Auto Care
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REFERENCES
Renton, Washington
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Reference 1: Washington Department of Natural Recourses Interactive Geologic Map,
h tto: / / www. d n r. wa. q ov f researchscie n celt o oics/g oosc ie nee sdata/ pages/g eology po rt a I . as p x
Reference 2· U.S. Geological Survey, 2010. Quaternary fault and fold database for the United States,
accessed November 10, 2010, from USGS web site: htto://earthguake.usqs.gov/hazards/gfautts!.
Reference J: USGS Seismic Design Maps. http://earthguake.usgs.gov/desiqnmaps/us/application.php
PACLAND Project #10507003
Firestone Complete Auto Care
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Technical Information Report
FIGURES
VICINITY MAP
SITE EXPLORATION LOCATION MAP
Project #10507003
Renton, Washington
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LEGEND:
-= Site Location
, .,... tllt!!P-;, Information
&IJllf:/....,• !To Build On
Eng,neering , Cons ul/,ng • Tes/mg
PACLAND
20508 56th Ave W Suite A
Lynwood , WA 98036
(425)409,,,250,4
Technica l Inform ation Re p ort Renton, Washington
NOTES
Site underl ay provided by Go~ Earth
PROJt C T NAME:
F Irestone Retal Store
17808 108th Av;,nue SE
Renton. Washington
OES CRIPn ON:
Vicinity Map
Project #10507003
DRAW'II :JY!
MS P
APPROVED BY:
MSP
s
DATE: rlGURC:
June. 20 16
P SI P ROJfCT NUMBf l!:
07 121375
Fi restone Co mplete Aut o Car e
LEGEND:
~ Borin g Location
I llfl"flul/l!!!!••J ln/orrnation
&11::!f:...._.,• To Btti ld On
Engineering • Consul /ing · Tesii ng
PA CL AND
20508 56th Ave W Suite A
Lynwood , WA 98036
(425) 409-2504
Tec h nical In for matio n Report Ren t o n, Wash ingto n
N
NOTES
Site under1 ay provi ded by GEi Engineering Associates ·Q:·
PROJECT NAI.IE:
Firestone Retal Store
17808 108th Avenue SE
Renton. Washington
DESC RIP TION:
She Exploration Map
Project #10507003
DRAWN S Y:
M SP
A PPROVED BY':
MSP
DATE:
June , 2016
s
FIGURC:
2
PSI PflO J ECT NUM BE R:
0 7121375
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Zipper Geo Associates. LLC
Geotechnical and Environmental Consulting
Project No. 1688.01
29 August 2016
PACLAND
1505 Westlake Ave. N, Suite 305
Seattle, WA 98109
Attention:
Subject:
Mr. Bill Fortunato
Summary of Field Infiltration Testing
Renton Retail
17808 1os1~ AventJe SE
Renton, Washington
l<ing County Parcel No. 322305-9104
Dear Mr. Fortunato:
This report summarizes the field infiltration testing servfc:es provided by Zipper Geo Associates, LLC (ZGA)
for the proposed retail development at the above-referenced address. Our services have been provided in
general <Jccordance with our Proposal P16269 dated 9 August 2016. Written authori.z;.ition to proceed
with our evaluation was provided by PACLAND on 15 August 2016. This letter is an ln.slrument of service
and the conclusions presented herein are in respect to the subject property and have been prepared in
accordance with gelierally atcepted geotechnical engineering consulting practice. This letter has been
prepared for the exclusive use of PACLAND 1 and its agents, for specific application to the subject property
and stated purpose.
SITE LOCATION AND DESCRIPTION
The project site ts a rectilinear parcel comprising approximately 1 acre of land with its long axis oriented eas.t
to west between 109:ri Avenue SE and 1081~ Avenue S.E in Ftenton, King County, Washington. The western
approximately 4/5" of the property is developed with a 2,200 square foot single-story building, occupied
by a Skipper's Seafood, with a surrounding parking lot. The eastern portion of the property is at a slightly
higher elevation and consists of a tended grass lot with scattered trees and a fence on its western edge
dividing the developed portion of the parcel frorn the greenspace. The site is bordered to the north and
south by developed comrnercial properties; to the east by 1091
h Avenue Sf and developed res.idential
properties t;ieyond; and to ,he west by 108th Avenue SE and developed c.ommercia! properties. beyond.
Topographically, the ground surface on the sit€ generally slopes gently downward to the west with a total
vertical relief from the east property boundary to the west of about 10 feet.
19023 361h Avenue West, Suite D Lynnwood, Washington 98036 (425} 582-9928
Project #10507003
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Zipper Geo Associates, LLC
Summary of Field Infiltration Tes.ting
Project No. 1688.01
29 August 2016
PROJECT DESCRIPTION
A plan provided for our review indicates that proposed development will include one building with paved
parking and vehicle access areas. ZGA was not provided with ptans for the infiltration facility. You have
Indicated that the infiltration facility may be approximately 8 feet below existing grade and located north of
the proposed building location below parking areas. A proposed location for infiltratfon testing was outlined
on Geotech RFP Exhibit 1.0, issued on 26 Ju!y 2016. The test location w.as moved to the eastern portion of
the parcel when it was determined that the Skipper's facility was still in operation and that the initial test
location wo\Jld irnpede parking and require resurfacin:g. The project site is illustrated on figure 1.
SCOPE OF SERVICES
The purpose of the limited geotechnical engineering services described in this letter was to determine a
field-measured stromwater infiltration rate at the site by complettng one field infiltration test. Our scope
of services included the following: reviewing the King County 2009 Surface Water Design Manual
(Manuan regarding stormwater infiltration testing requirements, arranging for marking of underground
utilities, completion of on-e infiltration test, and preparation of this report. Our scope of services did not
include addressing other geotechnical engineering aspects of the proposed site improvements.
SUBSURFACE CONDITIONS
Soil Conditions
Published geologic maps lndicate that the property is underlain by glacial till. A geotechnical report was
previously completed at the site by PSI {Geotechnical Engineering Report, Firestone Retail Store, 17808 10S1~
Ave. SE, Renton, WA) dated June l, 2016, Borings completed at the site as part of the PS1 report indicate the
site is generally underlain by a thin layer of asphalt concrete pavernen-t underlain by about 3,5 to 5 feet of fill
consisting of very loose to medium dense, silty sand. Below the silty sand fill, the boring logs disdosed
medium dense grading to very dense silty sand with variable gravel content (weathered glacial till grading to
unweathered glacial till).
Our infiltration test was completed in a test pit located in the eastern, undeveloped portion of the site at the
location shown on the attached Figure 1, Site and Exploration Plan. A descriptive log of the subsurface
conditions observed at the infiltration test location is presented in Appendix A as test pit TP-1. Please note
that per the Manual requirements, the soil descriptions are provided in accordanc~ with US Department of
Agriculture nomenclature. Soils observed at the infiltration test location included approximately 4 feet of
weathered glacial till material consisting of medium dense, light brown to tan with some oxidation, sandy
loam with gravel and some organics in the form of tree roots, The weathered till was underlain by
unweathered glada! till consisting of dense, tan to light brown, sandy loam with gravel The test pit was
terminated at a depth of approximately 8 feet in dense, tan, unweathered glacial till.
19023 361h Avenue West, Suite D Lynnwood, Washington 98036
Page2
Project #10507003
( 425) 582-9928
Firestone Complete Auto Care Technical Information Report Renton, Washington
PACLAND
Zipper Geo Associates, LLC
Summary of Field lnfiltr;ition Testing
Project No. 1688.01
29 August 2016
Groundwater Conditions
No groundwater W()S observed during our exploration, which extended to a depth of appro:i<imatcly 8 feet
below existing site grade at the infiltration test location. We did not observe soil coloration mottling
suggesting that seasonal groundwater may be higher than the observed condition PSI did not reporr.
observing groundwater in their explorations, which were advanced to a depth of up to 21 feet below the
current grade of the paved portion of the property. However, PSI notes that " ... PSI believes that small
amounts of perched water was observed in borings B-3 and 8-4. This perched water was observed within
sand lenses within the till soils and may be present in other portions of the site seasonally or after significant
precipitation events." Groundwater conditions should be expected to fluctuate-due to seasonal
prC'cipitation variation, irrigation, site utilization, and other f.a:ctors.
INFILTRATION TESTING RESULTS
A single smatl-sc.afe Pilot Infiltration Test (PIT) was completed at a depth of approximately 8 feet below
existing site-gr'adc in general accordance with the -procedures described in the Manual. The approximate
test location is illustrated on Figure 1. Based on the results of our testing, the field-measured infiltration
rate was determined to be approximately 0.21 inches per hour. for design, corrections (or reductions} to
the measured infiltration rate should be made for testing, geometfy, and plugging per the Monua/ to
arrive at a design infiltration rate.
CLOSURE
We trust that this letter meets your current needs. Please do not hesitate to contact us should you have
any questions.
Re,spectfully submitted,
Zipper Geo Associates, LLC
Robert A. Ross, P.E.
Principal
Enclosures: figure 1 -Site and Exploration Plan
Appendix A -Field Testing Procedures and Log
19023 361h Avenue West, Suite D Lynnwood, Washington 98036
Page 3
Project #10507003
[425) 582-9928
Firestone Complete Auto Care Technical Information Report
PACLAND Project #10507003
Renton, Washington
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Appendix G -Bond Quantities Worksheet
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3'.:iOJO SE Douglas Street, Suite 210
S:.oqualnie, Washmgton 98065-9266
206-296-6600 TTY Relay 711
Project Namo:
Location:
Clearing greater tllan or equal to 5,000 board feet of timber?
yes
If yes,
Forest Practice Permit Number:
(RCW76.09)
Page 1 af9
Bond Quantities Worksheet 2015 (4} xlsx
no
For alternate formats, call 206-296-6600.
Date:
ProJo-et No.:
Activity No.:
Note: AH prices inclu~e labor, equipment, materials, overhead and
profit. Prices are from RS Means data adjusted for the Seattle area
or from local sources if not included in the RS Means database.
Unit prices updated: 3f2/2015
Version: 312/2015
Report Date: 6/21/2016
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Site Improvement Bond Quantity Worksheet S15 Web date: C<4/03/2<l15
ERo~,~~,~~01~~~/c;~;;:~iit~umboc' ,.-~ •'<
?\:-y;
Baekfill & compaction-embankment ESC-1 $ 6.00 CY
Check dams, 4~ minus rock ESC-2
Crushed surfaclno 11/4~ minus ESC-3
Ditching ESC-4
Excavatlon-bulk ESC-5
Fence, silt ESC-6
Fonce, Temnora~ {NGPE) ESC-7
Hvdroseedino ESC-8
Jute Mesh ESC-9
Mulch, bv hand. straw, :r deeo ESC-10
Mulch, bv machine, straw. 2~ deao ESC-11
Pip-ing, temporarv, CPP. 6" ESC-12
Pioino, tem"""'rarv, CPP, a~ ESC-13
Piplna, temDorarv, CPP, 12" ESC-14
Plastic coverinn, 6mm thick. sandba,.,,.,ed ESC·15
Rip Rap, machine placed; slopes ESC·16
Rock Construction Entnmce. 50'x15'x1' ESC-17
Rock Construction Entrance. 100'x15'x1' ESC-18
Sediment nond riser ass.embJv ESC-19
Sediment trari, 5' hioh berm ESC-20
Sed. trap. 5' high. riprapped apillWay berm seciion ESC-21
Seedina. bv hand ESC-22
Soddlna. 1" deer., level ,.,round ESC-23
Soddina, 1" deep, sloped nround ESC-24
TESC Suoerui$or ESC-2S
Water !ruck, dust control ESC-26 WRITE-IN-ITEMS ... ~, eei e_!9\ Jt+;:·f ~:·~Si Y~'J'J?f;'
Page2of9
Bond Quantities Worksheet 2015 (4).xlsx
SWDM 5.4.6.3
WSDOT 9--03.9f3}
SWDM 5.4.3.1
SWDM 5.4.2.4
SWDM 5.4.2..2
SWDM 5.4.21
SWDM 5.4.2.1
SWOM 5.4.2.3
WSD0T9-13.1(2)
SWOM 5.4.4.1
SWOM5A4.1
SWDM 5.4.5.2
SWOM 5.4.5.1
SWDM 5.4.5.1
SWDM 5.4.2.4
SWDM 5.4.2.5
SWOM 5.4.2.5
SWDMS.4.7
;,;:r;l:\0f(t:':Jzt81::"JiJ~/;;,.J;
$ 80.00 Each
$ 95.00 CY
$ 9.00 CY
$ 2.00 CY
$ 1.50 LF
$ 1.50 LF
s 0.80 SY
s 3.50 SY
$ 2:.50 SY
s 2.00 SY
s 12.DO LF
s 14.00 LF
s 18.00 LF
$ 4.00 SY
$ 45.00 CY
$ 1,800.00 Each
$ 3,200.00 Each
$ 2,200.00 Each
$ 19.00 LF
$ 70.00 LF
$ 1.00 SY
$ 8.00 SY
$ 10.00 SY
$ 110.00 HR
$ 140.00 HR
,,•: F.~·i'.~ ·:/;i,'f,, :\!!
Eech
ESC SUBTOTAL:
30% CONTINGENCY & MOBILIZATION:
ESC TOTAL:
COLUMN:
',,If.of._.
1ff·atiOriS · Cost
;· ;c --.
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5
5
$
A
Unit prices updated: 3/2/2015
Version: 3/2/2015
Report Date: 8/2.1/2016
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.
Unit Pri<:e
GENERAL ITEMS ··-
B11ck'.llt & C0111pae11::in-ernbankme<1t Gl-1 s 6.00
8f!ckfill 1.. Conipaction-1rench Gl-2 s 9.00
C.{!nr."Rerno11e flrush. bvi1ar.d Gl-3 s 1.00
Ck!nri=,'Griilibinn/7roo Remova.1 Gt-4 $10,000.00
Excavatjon • bi.,lk Gl-5 • 2.00
r~cavation -Trench GI -6 $ 5.00
FP.:1c.mg, cedar. 6' hi!lh GI-7 ' 20.00
Fenc1n::i. d1ain link. virwl coated, 6' t11nh GI-8 ' 20.00
Fencir.g, chai11 l1!1i:., nate, virr,1 co<11te<I. 2 G!-9 $ 1,400.00
Fenorr, u~'.1t raii, 3' hiQh G!-10 S 15.00
Fil! & ::i:nl"aC! -common bar1ow Gl-11 s 2:5.00
Fili & comoac, -nravl!l basu GJ-12 ' 27 cc
1--m &. ccmMc: -screened loosoil Gl-13 ' 39.00
Gat:i.ll-n, t2~ deep, s1one filled m~h Gi-14 s £5 00
GaD1on. ni: doco, stone filled mesh Gl-15 s 90.00
GatMfl, 36tt deen, stone filled mesh G.I -16 $ 1$0.00
Gn1d:11g. fine, ov hand Gl-17 s 2.50
Grad'nn. linl!, wilh arad.er GI ,18 $ 2.00
Monu111en:s, 3' long GI !9 $ 250.(10
Sensitlvo Arnns Sinn G!-20 $ 7.DO
Soodm.J. 1" do1c". sloood r,rourid Gl-21 ' 8.CO
Sur1ayir:9. Lnc & "rade Gl -22 $ 850.00
Sur1c•1i'Y', lo: loc.alionllmes G!-23 S 1,800.00
':mfflc: co;11ra· crew ( 2 na-ooers) 01-24 $ 120.00
TmiJ. 4" chi~~ed wood G!-25 ' 8.00
i mil, 4'' crl)J;ll?.d cinder Gl-26 ' 9.DO
1 rn.1, ,;•• ton c::Q1,1rna GI-21 • 12.00
'1\/l'IIL reCainirr, ;;o~~rete Gl-28 • 55.00
V·l.;11. rockery Gl-29 s 15.00
l-'ag~~of9 $Ul:HOTAL
"KCC 27A aumorizes only o.1e bond reduction.
Clcnd Ouant.t,1.1s Wor'.~shect 2015 (4).xlsx
·-·--.. . .. •.... ·--·· --
Existing Futui"o Put-lie::
R!,ght-ol-W3y ~lghtofW111y
& Dratnaae Facllllies
Unit Quant I Casi Quant Cost OuMt.
CY
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SY .
Ac,e
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CY
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LF
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CY
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SY
SY
SY
SY
SY
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SF
Web cta1e 04."0J./2~15
.
Private
lmprove-mimts
Cost
Un.it prices updateo: 03./02.'2015
Version: 03/02/2015
Report Date: 6!2',12016
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RnA'""IHP VEMENT Nn
AC Grindi'"', 4' Wide mactiif1e-,; 1000sv Rl-1 s 30.00
AC Grindfnn, -4' wide mactiine 1000-2000 ~J-2 $ 16.00
AC Grind\"", 4' wide machine> 20QrlCV RI-3 ' 10.00
AC RemovaVDis"""'-al Rl-4 ' 35.00
Barricade e Ill ( Permanent l Rl-6 • 58.00
Curb & GU11er, ,oiled Rl-7 ' 17.00
Curb &. Gu1ter, vertical Rl-8 ' 12.50
Curb and Gutll?r, d&molition and di~,:iosar Rl-9 $ 1B.OO
curb, ext.ruded ar;onalt RI -10 $ 5-50
Cl.lfb. extruded CUf'ICrele RI -11 $ 7-00
Sa'1'1cut, r~ ... a!t 3" deptl"t RI -12 $ 1.t'!-5
sawcut, cOf'ICrote, !Mlr 1"' d""'th R!-1:J. $ :too
Sealant, .a&r'lt'lall Rl-14 $ 2.00
Shouldar, AC, '~oo AC road unit nrioo I RI. fS $
Shoulder, nravel, 4" thick Rt-16 S 15.00
Siclowalk, 4" thick Rl-11 S 3it00
Sidewalk, 4" thick, demolition aod dlcnos. Rl• 18 s 32.00
Sidewalk. 5" thick Rl-19 ' 41.00
Sidewalk, !:l'' thiek demolition and dl•""'S RI -20 ' 40.00
Sinn, tiarniica" Rl-21 ' llS.00
St Mi"", ""f Stal! Rl-22 ' 7.00
Stfloin.a, lhP.tniotilas!lc, l for crosswalk\ R!-23 • 3-00
Stripi"", 4" refleciorizecd line Rl-:2,4 $ o_so
Page4ofS SUBTOTAL
"KCC 27A ,11u1horizes. only one bond reduC!lon.
BGnd Quantities Wor~s.hMt 2015 (4)Jdsx
Existing Ful;unt Publi(;
Right.of-way Right of Way
& Drslnanc Fai;.lliti,g,:
Unit QuanL 1 CO:!l.t Quant. I cost QIJ!Jlli, I
SY
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each
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WM d8te: 0.:.1~31.:c·.1
Private
lmprcvel'l'lent&
Cost --
Unit prices updated: 03102/2015
Version: 03!02!2015
Report Date. 6i21/2016
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Site Improvement Bond Quantity Worksheet We:, aa;e. tlolJ.'.l:i.2:n~
Unil P,ice
ROAD SURFACING No.
Ace 1l 1orall 2 .5" Crushed Surfacino RS-1 $ 3.60
HMA 1l2" Overlay_ 1.5" RS-2 • 14.00
HMA 112' Ove1lay 2~ RS-3 • 18.00
H...1'A Road. 2". 4" ror.k. Fir.;12500 SY RS-4 • 28.00
HMA A.-0,ul Z'. 4" rock. 01v. over 2500 S RS-5 • 2i.OO
HMA R<1ad, 3 •• 9 112" Roclt, First 2500 S RS-6 • 42.00
HM Roao 3'". 9 1f.l" Roe..;, Otv Over 25 RS-7 $ 35.00
Kot .J5ed RS-8
~cl Usod RS-9
HMA Raad, 6" Depth, Fir.;l 2500 SY Rs--1c $ 33.10
HMA Road, 6" D<:!pth, Otv. O~tl-r2500 SY RS-11 $ 30.00
HMA 314" r.,r i", 4" Depth RS-12 $ 20.00
G 0 avel Ro:nirl. 4" r-:i~, Firs( 2500 SY RS-13 $ 15.GO
Grn\1£1 Road. 4" rock:. Qlv. over 2500 SY RS-14 $ 10.00
PCC f~oaa tAad Under Write•lns w/Deskl RS-15
Ttlickc11!!d Ed;it! RS -17 S 8.60
P.ige 5 cf 9 SUBTOTAL.
'KCC 27A aw:t1!'Jttles only OM:: !IOrld redw.::Lion.
R,:md Cl1m1ti:re~ V.rorksheet 2015 (4}.ll1$X
.E>Cl&tlng
Right~f-way
Umt Quant. I Co5t
(4" Rock -2.5 baae & 1-5'' to
SY
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FutJJre Public Private
Right ofWay lmi;m;ive,ments
& Dralna1:1e Facllitie-s
0Lrant. I Cos1 Quant. I Cos1
course 9 112" Reek-8" oase & 1.5" too course)
Uni:. pr'i~s upc:ated: 03/02/2015
Vorsi-on:· 03/02/2015
Repo."t Date: 6/21/2016
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Exl!!.tirig Futuril" Public Private
Right-of-way RighfofWay lmprO'Vements.
& Dralnann. FacUitles
I U11itPrii;e unn Quant I Cost Quarit. l eo,1 Quant. I eo,1
DRAINAGE: ICPP"' Comigated pta$tlc Pipe, N12 or Equlvolenl) For Culvert nrlces, Averaoe of4' cover was assumed. Assume oerforated PVC !s same mice as solid pipe.
Access Ro11d, RID D• 1
Bolkmis • fixed D•2
Bnlta,ds -removable D-3
• fCBs 1nt:Juc,e frame and lid\
ce r I D-4
csr,-... 1L D-5
CB Tvne II, 4!!" diameter o .•
for addl!iona! (len1h over 4' D-7
CB T--~~ ll, 54~ dlamotcr D-8
for additional de-.... over 4' D-9
CBT 11, GO" diamoll!!r 0•10
for additi0t1.;1I de 0V'@f4" 0-11
CB T•"'e 11, 72" dismtiler D -12
for atlditional depth over a: D• 13
Ttlro• "'Ii-curb lolet Framework IAcJdi D-14
C!oanout. PVC, 4" D" 15
C!eanou1, PVC, 6" D-16
C!eanout PVC, 8" D -17
Cullr'E!rt, PVC, 4" D-18
Culll'lr!rt. PVC, 6" 0-19
Cufvert. PVC, s· D-20
curver1. PVC, 12" D-21
Cu!'Vcr!. CMP, 8" 0-22
CuNm CMP. 12~ D-23
Cu.lvt;m, CMP, 15" 0-24
Culvert, CMP, 18" 0~25
Culvert. CM?. 24~ D-26
Culvert, CMP, 30" D-27
Culvert, CMP, 36' D-28
Culvttrt, CMP, 48" D-2g
C11lvert, CMP, 60" 0-30
Cui'l'ert, CMP, 72" D-31
Page6of9
'KCC 27A authDrlz.es only one bond" ~di;ction.
Band Ouarrtlties Worksheet 2.015 (4).Xl$X
$ 21.00 • 240.74
' 462.34
$ 1 600.00
S 1,750.00
$ 2,300.00
$ 4B-O.OO
$ 2,:500.00
$ 495.0t'l
$ 2,1300.00 • 600.00
:S 3,600 00
' aso.oo • -400.00 • 150.00 • 170.00
s 200.0D
s 10.00
s 13.00
' 15.00 • 2.3.00 • 19.00
s 2:9.00
s 35.00
' 41.00
' 5600
$ 78.00
$ 1::moo • 190.00
s 270.00
' ~so.oo
SUBTOTAL
SY I
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FT
""'" F7
"''" FT
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Each
Each
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LF
LF
LF
LF
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LF
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Unit prices updated: 03/02/2015
Version: 03102/2015
Report Date: 6f21f2C1G-
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DRAINAGE CONTINUED
No.
Cl1,ver:, Conoe1e, B" 0-32
Gulvc-r: Goncrel-e, t ZT 0-33
Cu!vcrt Concrete, ;5w 0-34
Culvi;rt Can1:rc1(1, te· 0-35
Culvrart Concrota, 24-0-35
Culvert Concrete. 30~ 0.37
Cirrvert Cam:rnlc, 36" 0-38
Cu!vc1t. Concrete. 42' D-39
Cuiv11rt Concrnle. 48'' 0-4D
cu:ve-rt. CPP. G" 0-41
C.ilv!lrt. CPP. B" 0-42
CW~a:t C.-'P 125 0-43
C,11·~~1t C?P 15' D-44
C,ilve,; C?P \B" D-45
Ct1lve-rt C?P 24" D-46
Culvmt. CPP. :w· D-47
CJlvmL C?P 36" 0-4S
Dit..:hir:u D,4-G
Fl::w-.' D1s0-0rsal Trencti 0,436 bas.~l 0-50
f.'rnflcn Drn111 ('3' depth} D-51
Gcc1cX1i,c, laid in :rencil. ool.,.oroovlene 0-52
Mid l,mk Access Risor, 48" dta, 6' deep D· $4
Pond OverlOO\•/ Scillwav D-56
Res1ric1or/Oil Se-oarat.or. 12" D-56
H: .. i;1r1cioriCll Se-pati'.lWr, 15·• D,fi7
Res1ri1:torfOil Se-parator, 18"' D-58
Riortto, !":lacec D-69
Tork fn<l Red!)oor 136" di,1me-terl D-60
Tr.ish R.ack 12" D-61
Tra:n f.:;it:k, 15" D-62
Tras'l Rack 1a• 0-63
Trnsn Rack. i1" D-64
Pai,e 7 of 9
'KCC i7A au:U1ariz~s on:y one DO-.~d reduction.
Llo:id Qwantil.es Wor'11.sf~ei 2015 (4).xlsx
Site Improvement Bond Quantity Worksheet
E1tbti11g Futul"9 Publlc
Right-of-way RightofW_.y
& Draioaao Facilitiu
UnrlPtiCll Unit Quant. Cost Quant Casi Quan!
' 2:~.00 LF
' ~.00 " ' 42.00 LF
$ 48.00 LF • 76.00 " • 125 00 LF
$ 150.00 LF
$ 175.00 LF
$ 205.00 LF • 14.00 Lf • 16.00 LF • 24.00 LF
$ 35.00 LF
• 41.00 " s 56.00 LF • 78.00 LF • ',30.00 LF
$ 9.50 CY
$ 28.00 LF
s 26.00 LF
s 3.00 S(
S 2.000.00 E.ach
s 16.00 SY
$1,150.00 Each
S 1.350.00 Ec1cl1
S 1.700.DO Each
' 42.00 CY
S 1,20000 Eiich
' 3!.i0.00 Each
$ 410.00 Each
$ 480.00 Each
$ 550.00 Each
smnorAL
W11b date· 04103'2015
P,Jv.ate
[mprovoments
Co:;.t
Unit prices updatod. 03/0212015
Version: 03/0212015
Report Date: 6/2112016
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Site Improvement Bond Quantity Worksheet Well :iate-. OJ11U3."21J15
E;1:l$.ting FuttJre Public PrivaU!
Right-of-way RlgJJtofWay Improvements
& Drainacto Facllltios
I Uni! Price Unit OIJ.Jnt. I Prico Quan: CC1st auant. I Co~I ---
PARKIN" LOT., '°FACING Not To Be Used For Roads Or Shcul<!er.s
!!2.
2" AC, 2" ton ecut!le rock & 4• borrow Pl• 1 $ 21.00 SY Nk NA
2" AC, 1.5" 10"' oourse & 2.5'' base CO\Jr Pl-2 • 28.00 SY NA NA
.ci•· s;a-lecr botrow Pl-3 $ 500 SY NA NA
1 5• lop c:ou(S(! rock & 2.5" base course PL-4 • 14.00 SY NA NA
UTILITY POLES & S ., Tl Uti~ no!e rel-oc.it!on casts must be ao.::omnanied bv Franchise U1Hity'9 Cost Estlmate
UIII"" Polc/s\ Relocation I UP-1 Lumn Sum I I I I
SlrlX!t Unhl Pole-,; w/lumlnaires I UP-2 I $ 7,5()0.00 I Each-T I I I I
W 0 'TE.IN-ITEMS
I '.Such as c!~t-onUonrwater "ualih• v1rnlb.' lliL
Stormwafer Vault Wl-1 -Each
Block Wall Wl-2 $ 16.00 SY
Yara Drain W1~3 $ 225.00 CY
WJ.4 LF
Wl-5 FT
Wl-6
Wl-7
Wl-8
Wl-9
w1.10
SUBTOTAL
SUSTOTAt. (SUM ALL PAGES):
30% CONTINGENCY & M0Bll.!ZAT10N:
P$geaof9
~KCC 27A authorizes only one bond red1.1ctiQ(I.
El£ind Quantities Worlc:sheet 2015 {4).xlliX
GRANDTOTAL:
COLUMN: B C 0
Unit prices ~pdatad: DJ.102.12015
verstor.: 0310212015
Report Date: 6!'2112016
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Site Improvement Bond Quantity Worksheet Web d~te: 04/03.'20':5
Origlna! bond computations prepared by:
Name:
PE Registration Numbor:
Firm Nam,e.;
Add~ss,
Dato: ___________ ~
Toi.#: ____________ _
Projeet No:
FINANCIAL GUARANTEE REQUIREMENTS
Stabil1zalion/Erosion Sediment Control (ESC)
Existing Right-of-Way Improvements
Future Public Right of Way & Drainage Facilities
Private lrnp1ov11:nnents
Calculated Quantity Completed
(First $7,500 of bond' shaft be cas:i}
(A)
(8)
(C)
(D)
s
s
s
s
PERfORMANCE BOND"
AMOUNT
Tot.al Right-of Way and/or Slte Restoration Bond'"r'" I (A+B) $
Performance Bond .. Amo1.Jnt (A-tB+C-tD} "' TOTAL (T) ...:,:S _______ ..;c._
Minimi;m is $2000,
Mainienance,10efeci Bond~ Total
MINIMUM BOND" AMOUNT
Rl::QUIREO FOR RECORDING OR
TEMPORARY OCCUPANCY AT
SIJBSTANT!Al. COMPLETlON ..,..
'f' X 0,30~$ ______ _
Minimum is S2COO.
PUBLIC ROAD & DRAINAGE
MAINTENANCE/DEFECT BOND•
(8,!,C} X
0.2s = _s,_ _____ _
Minirr11.1m is $2DOO.
NAME OF PERSON PREPARING BOND· REDUCTION: Date:
'NOTE: The ~,;~rd "b'll!ld" .as used 1n this documer,t means a fin;111cial guaranlfle acceptable lO King County .
... NOTE: KCC 27A eLrtbor«zos right of way and :.ite restoration borws :o bo combined when both a1e required
inc roslma.tion requirement shall include ~e tot.al cost for all TESC as a mir,imum, not a maximum. In addrt:ion, corre,;:;tiv,e work. both or.-and off-s;ta nee<!s to be included..
Quanl;lies sh&II reflect worse t:.:1se scenarios not just mmirn-u:m requ1remenls. For eitarnpte, if a s.almonid stream may be damaged, .:;ome estimatei;i t;Qst%l far r.a~lcr$!!i.'.ln
needs to be ;eflect-ed in this amount. The 30% contingency an.d mobiflzalion costs are computed in this quantity.
.... NOTE: Per KCC 27A, tP!al bond amounts remaining after 1etlucbon sllali not 0018$$ than 30% of the origin.al amount (T} or <1s revised by ma;orde::.ign ch;;inges.
REQUIRED BOND• AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY KING COUNTY
Po1ge 9 om
Checl< out the DDES Web site at www.klnqcoynty.gov/permits
Oonct Qua.nUtlos Worksheet 2015 (4).xlsx.
Unit prices updated: 03/02/2015
Version: 03/02/2015
Report Date 612112016
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