03-100859 TIR ONLYT E RRA F O RMA
DESIGN GROUP
DEEPEECOMMUNITYYVLONT DARTMENT
TECHNICAL INFORMATION REPORT
WALGREEN'S #06901
LOCATION:
2407 South 288th Street
Federal Way, WA
ISSUE DATE:
February 21, 2003
PREPARED FOR:
VILLAGE / SEATTLE PARTNERS, L.P.
PREPARED BY:
Terraforma Design Group, LLC
5009 36th Avenue SW
Seattle, WA 98126
TDG No. 02032
DEcG
C[!OQ— ry OF wASIe',
355kS
�FGISTER�ID
ASS/oNAL
EXPIRES 06/11/_!
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CIVIL ENGINEEf ING
& LANDSCAPE ARCHITECTURE
1
5009 36th Avenue SW Seattle WA 98126 phone 206.923.0590 fax 206.923.3.507 a?mai( tforma nwlink.com
S. 288TH ST.
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VICINITY MAP
SCALE: N.T.S.
WALGREENS
PROJECT OVERVIEW
The proposed development consists of a new Walgreen's store located at 2407 South
2881h Street, in Federal Way, Washington. The store will be located on a 0.71 acre lot.
The project also involves regarding and paving of the existing shopping center property
with a total site reconstruction area of 2.06 acres. The proposed commercial project
requires compliance with the 1998 King County Surface Water Design Manual
(KCSWDM), as amended by the City of Federal Way.
The property is currently developed, consisting of two, 1-story buildings and an
extensively paved lot. There are minimal trees or shrubs on the lot. The site slopes to
the southeast, with an average grade of 5%. The existing soil type consists of silty
sands with some gravel.
The net increase in impervious area will be less than 5000 sf. According to previous
review by the City, the development will require Category 3 Targeted Drainage Review
or Category 2 if the existing conveyance system is being altered. Category 2 analysis
will be provided since we are altering our on -site storm conveyance system. Site
drainage will continue to drain to the existing 12" storm main within Military Road.
Stormwater treatment will be provided for the redeveloped area.
CONDITIONS AND REQUIREMENTS SUMMARY
The proposed storm drainage system must comply with the 1998 King County Surface
Water Design Manual (KCSWDM), as modified by the City of Federal Way drainage
code.
The storm drainage report will provide a preliminary review of the core and special
requirements of the KCSWDM as specified by the City of Federal Way.
Core Requirement #1- Discharge at the Natural Location
The reconstructed on -site storm system will continue to drain to the same existing catch
basin within Military Road.
Core Re uirement #2- Off --site Analysis
According to County records, the site is part of the Lower Green River Drainage Basin.
The existing on -site runoff discharges to the 12" storm within Military Road. The 12"
storm drain extends southward approximately 500 feet and discharges to an existing
ditch along Military Road. The existing grass ditch extends southward approximately
650 feet with a few minor culverts for driveways. The ditch is well vegetated with little
evidence our scouring. The ditch ends with a large open grate and submerged vault
which collects the runoff and conveys it further southward via an 18-inch storm drain.
This drainage eventually crosses to the east side of Military Road into a existing wetland
before continuing eastward towards Interstate 5.
Core Re uirement #3- Flow Control
The net increase in impervious area is approximately 4925 sf, therefore, since the
increase is less than 5000 sf, flow control is not required by City code. See attached
existing and developed drainage basin maps.
2
Core Requirement #4- Conveyance System
The proposed convey system will sized to accommodate the 25-year, 24-hour storm
event per City standards.
Core Requirement #5- Erosion and Sediment Control
Erosion and Sedimentation Control measures will be provided during construction. A
detailed ESC plan will be provided with the building permit submittal.
Core Requirement #6- Maintenance and Operations
The proposed private storm drains will be maintained and operated by the owner. A
Maintenance and Operations Manual will be provided with the permit submittal.
Core Requirement #7- Financial Guarantees and Liability
Will be addressed by the owner prior to final approval
Core Requirement #8- Water Quali
Water quality measures will be required since greater than 5000 sf of pavement area will
be disturbed. The water quality facility will consist of a Stormfilter vault by Stormwater
Management, designed to treat the entire area (2.06 acres) of redevelopment. See
attached calculations.
Although the portion of the existing shopping center property to be disturbed is greater
than 5000 sf, only the disturbed area shall receive stormwater treatment.
Special Requirement #1- Other Adopted Area Specific Requirements
Not applicable.
Special Requirement #2- Flood Plain/Floodway Delineation
Site is not within a floodplain or floodway.
Special Re uirement #3- Flood Protection Facilities
Site is not within a floodplain or floodway.
Special Requirement #4- Source Control
Source control BMP manual will be provided to the project owner and the City during the
building permit submittal.
Special Requirement #5- nil Control
Storm treatment will be provided. The project is not classified as a "high use" site..
3
STORM FILTER PRELIMINARY CALCULATIONS AND INFORMATION
The StormFilter technology uses composted leaf material to mechanically filter solids,
chemically process soluble metals, and adsorb oils and greases. The number of
cartridges required to adequately treat the storm water were determined by using the
following equation:
N=Q*449/15, where
N= number of cartridges
Q= peak flow (cfs) as determined using King County Run-off Time Series
449 gpm per 1 cfs
1 cartridge per 15 gpm
Using the KCRTS 15 minute time, the water quality design flow is 60% of the developed
2-year flowrate (if preceding detention or no detention). Per the following data, the water
quality design flow, Qwq = 0.60 * 0.79 = 0.47 cfs.
Flow Frequency Analysis
Time Series File:02032wq.tsf
Project Location:Sea-Tac
---Annual
Peak
Flow Rates---
-----Flow
Frequency Analysis-------
FlowRate
Rank
Time of
Peak
- - Peaks
- - Rank
Return
Prob
(CFS)
(CFS)
Period
0.786
6
8/27/01
18:00
2.15
1
100.00
0.990
0.548
8
9/17/02
17:45
1.57
2
25.00
0.960
1.57
2
12/08/02
17:15
1.08
3
10.00
0.900
0.633
7
8/23/04
14:30
0.906
4
5.00
0.800
0.857
5
10/28/04
16:00
0.857
5
3.00
0.667
0.906
4
10/27/05
10:45
0.786
6
2.00
0.500
1.08
3
10/25/06
22:45
0.633
7
1.30
0.231
2.15
1
1/09/08
6:30
0.548
8
1.10
0.091
Computed Peaks
1.96
50.00
0.980
Conclusion
Number of cartridges required = (0.47 * 449) / 15 = 15 cartridges.
Use a 8' X 16' Stormfilter Vault, manufactured by Stormwater Management.
Iq
GENERAL NOTES:
I.) SIOREELM BY SRIRMWAIER YANAOEMOJI, PORRAND. ORMM (503-240-3M).
2.) ALL STOfWFlLSiitS RMUM MOUTAR MANRENNICE REFER M OPERATION AND LMNIENANCE MANUAL FOR
DETAts.
3.) PRECAST CONCRETE VAULT CONSTRUCTED N ACCORDANCE MM ASM CoW.
4.) E1f1ERNAL PPNO AND COLPUMM PROMOED BY OTHERS.
&) FUME COUPLli05 TO BE SET TB' OUTSTOE FACE OF WALL FEMM OR ENGINEER APPROVED.
4.) SEE PRECAST STOR FLM DATA SHEET FOR VAULT ON ADMAON5. a&ATWO ANO NUMBER OF CARn%OM.
7.) APM-FLOATADW RI IAST TO BE SET A1OW,- DME LE)C>7 OF BOTH SIOM Of FILTER AS SHOWN.
SEE PRECISt MTER WA %JXX FOR &UTA.ST Wt01N ANT MaF >ff DAWpJSsaM-
8' x 16'
SCALE: N.
PRECAST STORMFILTERTM- PLAN VIEW
n. �Tvm►m ruel®mrr
STc�llker
as rAmQ r. smrr.
xw 5A M.M AIM
AM I+>.Iar ramps PZ N
8'x16' PRECAST STORMFILTERTM- SECTION VIEW fA-A'�
SCALE: N.T.S.
T o"m or. � WNW= w_ mmR 0 u 8'X16' PRECAST STORMFILTER
w: }�a_ �o k iw+E ao¢
�n PLAN AND SECTION VIEW
i STANDARD DETAIL
f SCALE: 7RglECT rp, O�rwG RE N.wE-
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5
CITY #OF1
335W I ST WAY SOUTH
DATE: September 21, 2000
TO: Jim Harms
MEMORANDUM
Public Works Department
FROM: Ann Dower
SUBJECT: 288TH & MILITARY RETAIL PROJECT - (00-104487-00-PC)
28855 MILITARY RD S ; Public Works Comments
After reviewing the information submitted on August 24, 2000 and visiting the site, Public Works Department
offers the foilowing comments:
Lend Use Issues:
1. Projects in Federal Way must meet the requirements of the 1998 KCin County Surface Water Design
Man I and the City of Federal Way Addendum to the KCSWDM.
2. Completion of the binding site plan will not require storm water improvements.
3. Because this is a redevelopment project, Federal Way City Code Section Zz-337 applies. Storm water
treatment facilities must meet current standards if the project exceeds one of the eight thresholds.
The proposed Walgreen building will exceed threshold number 2, which Is construction or
replacement of a building footprint have a surface area of 5,000 square feet or more. Therefore,
along with the land use sutxnittal for the Walgreen building, the applicant roust submit Category 3
Targeted Rrainage Review. Category 2 Targeted Drainage Review maybe required if the existing
conveyance system is being altered. If the existing parcels are reconfigured through a boundary line
adjustment and are under separate ownership prior to building permit issuance, current surface
water treatment standards will only apply to the new Walgreen parcel. If the parcels are not under
separate ownership, current standards wig apply to the entire $hopping center parcel.
4, Thresholds that may apply to the proposed 3,000 square foot retail building are as follows:
(3) redevelopment which involves repair or replacement of 5,000 square feet or mare of impervious
surface (le: the parking lot is resurfaced as a result of the project)
(6) redevelopment which involves a change In use, and the changed use has a potential to release
new pollutants to surface water systems
(7) redevelopment in any one consecutive I.2-month period which exceeds 50 percent of the
assessed or appraised value of the existing structures.
5. If any of these thresholds are met, the requirements described above will apply to the parcel on
which the retail building is located.
6. The Basic Water Quality !Menu provided in the KCSWDM must he used In selecting a treatmentoption
for this site,
7. Placement of treatment facilities offsite for the proposed Walgreen site is not recommended and will
only be approved if no other options are available,
8. If frontage Improvements are required and frontage Is $00 feet or more, overhead utilities must be
placed underground.
0
APPENDIX A - BASIN MAPS
AREA (pervious) = 17994 sf (0.53 ac) 0 so
AREA (impervious) = 66770 sf (1.53 ac) "W!!�
AREA (total) = 89689 sf (2.06 ac) 1 inch = 50 ft.
WALGREENS #06901 DRAINAGE BASIN MAP
2407 SOUTH 288TH ST. - EXISTING CONDITION
by. Pedro DeGuzman, PE DATE: 2/21/03 2
Terraforma Design Group, LLC —
SOUTH 288TH STREET
(flee Y STREET)
AREA (pervious) = 17994 sf (0.41 ac)
AREA (impervious) = 71695 sf (1.65 ac)
AREA (total)
WALGREENS #06901
2407 SOUTH 288TH ST.
= 89689 sf (2.06 ac)
1 inch = 50 ft.
DRAINAGE BASIN MAP
- DEVELOPED CONDITION
I
9
11
by. Pedro DeGuzman, PE
Terraforma Design Group, LLC
DATE: 2/21/03
A -3
APPENDIX B - OFF -SITE DRAINAGE MAP
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APPENDIX C - STORM PLAN
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PROJECT CONTACTS
Rr J * ~ r F�w[L a
1011 mu=+0a os DEVELOU
1 I J r Sri �P a!2 y E= a5s.0o NLLALE/SEA7RE PARTNERS, LP.
10655 NC 47H STREET 9300
R[PLnU ❑IStIxG _
J*i Ijj VI fs �� �� - - F °❑w LpE ■1�°B: s PL.wnRt W10 BELLLWE. WA 98004
ly O� 5� �p���`y, C '■ p _ R p4• EST
aaEW J PHONE (4245 CONTACT. RUNE -0500AU
% asB Ne. 27 pE511ECI
�� ,,, PARTNERS ARC14TECURAL OESIGN GROUP
ACO tPENRI SIRdPl4►
ACOI H,15 cAvr.l 2EA LE. W 1071H STREET J320
P�- 1 ff J I B 1rY � Y isa 33
_p _II+ f xl =d6S c a [.� _ COONTACT: ERIC990CH
B + rt= sBlo yam` �^ PHONE (z06) 361-1358
I � + ( FUTURE RETAIL PAD
y lick; a CIVIL
e[ IT
ay y� ' 6� I .�,A 10 TCRRAFORMA D15M CROUP
TIP 1. m 15 EB tl 5 SCATTLE. WA 98126m
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wr. ruo r jt/�y. w a Ir:•i 0. I ' [• '4]TD � TnI iYp : � �] CONTACT: PEORO OEGVZMAN, PE
1 Rm wzo
PHONE (206) 923-0590
AGENCIES
IF,
OFEDERAL WAY
335 EST WAYSOUTH
FEDERAL
WAY. WA 98063
IYABB.SE
1 LNfENA4EN UTILITY DISTRICT
+ ] W j 7[ C• _^- - ---_• FEDERAL
AVENUE SOUTH
8063
` y y ".� a i h FEDERAL WAY, WA 90003
S `A- F� y.- Z ' • PH TACT: BRIAN ASBURY
PHONE (253) 946-5407
PUCE'
SOUND ENERGY (POIELCO. INC)
BOOT SOUTH 2127N STREET
1 1 1 pt I/JIfL_ L� - h KENI, CONTACT: WA LEANNEANNE
KLYES
+ 4 a
f /I PHONE (2531 395-7030
K
i ifiii II II fl r-�, . • �.y. �_., ),. PROJECT NOTES
_
.,15 !' LEGEND PARCEL NUMBERS
042104WM OLD Rz7A HUT, NEW WALGREENS LOT
Ti.S 1 0421049037_ EX SHOPPING CENTER
j Yjp a� n]!'
� • I I 6 6 • +Ta3 4� Gtt�G----4—L-�L—G�G•—y--6rt-O��L-6�4 _- EXIS7NC PROPOSED
I � yytt I{I ie' ��O•--- ItfrttlfL•RC90!1
I l 'LJJ f I 1 m.1 _ ,rr y ^- I C ccnrnnC REFER TO BOUNDARY UNC AD.USIMENT PLAN BY
[7( W II If CLNYp■.[1 + RIX%[RY /CONC.RWr WALL NEBRANK. STEADMAN C AS%IOATES, INC
I k �w g 1 n2 I WfLf pwa _
uwirnr EXISTING SHOPPING - n°rmr "f
jII 't/D r I� Ij �- VERTICAL DATUM
1 1 1 -- —l0 - wanlxc cartau+
I I ° CENTER BUILDING RAILROAD SPIKE IN FAST FACE OF UTILITY POLE.
j 1 N 1 1 lei
e ¢Q ! ) ) :• srrl . T. ffFc , �5o ao 9�00 SPIN, Et[vAnox
w V WESTSEOUL SIDE OF MILITARY ROAD. NORTH 90E OF
TEN MIUTPRYLROAD1VEWAY SDUO.TUELP425118NFEETO(N6VO529)
1 7Ir 2 w I ? b I C d/ pBp w pap —s— 4xcR urnf PER AI B M NO 2200-40
— 0— SrRRY aPAN
tr ORE xroRAN EAP7HNORK CUT = 2185 BCY
' rn i' b W I ��• LSN v EARTHWORK FILL = 833 BCY
1� WATER Yfl[R
tl. RVILUA. 7(
I�,Ir% � I •� 1 - � 15 BE � i I ' Ftl1 PERMITTING 115E ONLY
I i 1 I I r, E '�^� l CIImNc oMVF wNWM IIh[s STO uNM0.0
� SIIC�A -- BY�,SP9 SF
II (TI R[Ynx ❑ ■ LrORY ® EXISiIN IMPERVIOUS AREA — 66 5 SF
I IU'wowR ■ S,EI. _RE PROP DSEO IMPERVIOUS AREA = 7Efi95 SF
E M � I n I Nf a# 1 '\d I _�_ [CECIRICIE W2 NET INCREASEINPCflW APEA = 4925 SF
5-1 �\ i ({ I 1 1 . ❑ ° fN1 • i e y �I —T— TEITFlNPE UK Smal MEET NCRESE IN IMPERVIOUS AREA IS LC55
cA51Ert THAN 5000 ST, DETENTION FACILITY IS NOT
`+I �Y— V Y'-•'1� ypy � e `. � ClEnnnE 1PAxsow[P REOUIPCD
j f REal rfYN [ - / i ® •, CAL Y[ICR STORM TREATMENT 10 BE PROVIDED VIA
l SIORMFILTER SYSTEM BY SIORMWATER MANAGEMENT.
W v f i qp, 1 1 A �f umnr atlE[ WALGRETREATMENT. PAVEMENT OUG DRAINAGE TO OF IVESHOPPING
PPIN
aS / I T / CENTER
PROPERTY
10 DI TENTED! OF SHOPPING
I yn.Y..�..t♦ STKCI MaN
S� � «� � CENTER PROPULTY TO BE OISNPBEO IS GREATER
II'p r, GI / I I T / -xx-x- rEna IN 5000 SF, ONLY THE DISTURBED AREA SHALL
o I ��I�Oy� sY TREES RECO14 STORMWAIER TREATMENT (TREATMENT OF
1 _T RIM= 41MA .n a6 � y 11 LL.. V-4----V V��—�5A�1.. _y„y �Y �v=v�Y�Y.---•4 'V� ALL SHOPPING CENTER DRAINAGE NOT RCOUIPED),
I I I
r I �••-F___�p-- �_ Eft X�-
THE WALGREEN5 LOT OEVELOPMCM TPIGGERS
EOUIR
[ y �� • 1 4 Y _ _ - _ - l - ROADWAYENPROVCMCN7 TRIGGER
ON ONLY
SWIM 28BIH STREET, 1HC SHOPPING CENTER LOT
- - ^ ' TRE OEET DOES NOT AD IMPROVEMENTS
SOUTH
f I -- •• - _ �� _ �_ _ ITS �T ANDPROPOSED
IARY CONSIRUCE
C➢O WILSIN
CONSTITUTE LESS
THAN VALUE
OF ITS TOTAL ASSESSED PROPERTY
GRAPHIC SCALE E
I _ SINCE THE WALORECNS FRONTAGE IS ONLY III FEET
Or IN[ TOTAL 270 FEET OF MINE SIRE
FRONTAGE. DMCPER IS REOUESING A DEFERMENT
��. ( IN
FEET) OF THE ROADWAY IMPROVEMENTS ROW
I I— = 20 rL DEDICATION WILL BE PROVIDED
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SHEET TITLE
PRELJMINARY
GRADING AND
DRAINAGE PLAN
5` EET NO
C1