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06-84c (bld20060585) 20060815125612.pdfCity of Edmonds 121 5"H AVENUE NORTH • EDMONDS, WA 98020 • (425) 771-0220 FAX(425) 771-0221 Website: www.ci.edtnonds.wa.us DEVELOPMENT SERVICES DEPARTMENT Planning • Building • Engineering Pian Check #: 20060585 (old 06-084c) Date: 15 Aug 06 Project Name/Address: Westgate Chapel Parking Lot; 9303 228" St SW Contact Person/Address/Fax: : Walt Adamson fax/email: waltreidun@comcast.net Reviewer: Lyle Chrisman, Engineering Program Manager Division: Engineering The subject application has been reviewed and the only outstanding Engineering issues to be resolved are listed below. Please resubmit the 3 sets of drawings and the cost estimate to a Development Services Permit Coordinator. General 1. Comment from Jul 6, 06 still not addressed: Per my March 29`' comment, I still need yourContractor to break out his bid for on-site and off-site work. In order for me to determine the bond for oft site work, I will need to know what work (including quantities) is off-site. Landscape plan 2. It appears my original comment #73, and Meg Gruwell's review comment 1 b dated 3 Apr 06 with regard to my issue with planting on the north side of the site interfering with the pert drain pipe still has not been addressed by the Landscape Architect. The Landscape Architect and Civil Engineer need to discuss how this will be resolved. Storm Drainage report 3. See attached comments. DATE FAXED (Attach fax transmittal) PAGE OF S:\ENGR\PRIVATE DEVELOMENT PROJECTS\REVIEW\COMM-MULTI & LU\2006\06-084c -20060585 Westgate Chapel Parkg lot.doe A 1`7 40 Hydrology Report ce A q$ t kv6o3 crc� W STd TE CHAPEL. f7 C c al , Vo VI/fk 1) GROUP FOUR, Inc. RES U b 16030 Juanita -Woodinville Way NE Bothell, WA 98011 FAX (425) 362-3819 (425) 775-4581 d, (206) 362-4244 _jv_AA.%-'umznc. 16030 Juanita -Woodinville Way NE Bothell, WA 98011 OS 7/24/06 GROUP FOUR, Inc. page l -----------------____________ BASIN SUMMARY BASIN ID: le002 NAME: Existing 2 yr, 24 hr SCS METHODOLOGY 1.56 Acres BASEFLOWS: TOTAL AREA.......: RAINFALL TYPE....: 1.56 Acres BASEFLOWS: 0.00 cfs PRECIPITATION....: TYPElA 1.50 inches PERVIOUS AREA TIME INTERVAL....: 10.00 min AREA..: 1.56 Acres CN....: 85.00 TIME OF CONC.....: 59.18 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA..: 0.00 Acres PEAK RATE: 0.08 cfs VOL: 0.06 00 Ac -ft TIME: 98 540 AREA..: 0.00 Acres PEAK RATE: 0.39 cfs VOL: 0.20 min min BASIN ID: le010 SCS METHODOLOGY TOTAL AREA....... RAINFALL TYPE....: PRECIPITATION....: TIME INTERVAL....; TIME OF CONC.....: ABSTRACTION COEFF: PEAK RATE: NAME: Exist 10 yr, 24 hr 100 yr, 24 hr 1.56 Acres BASEFLOWS: 0.00 cfs TYPElA PERVIOUS AREA 2.00 inches AREA..: 1.56 Acres 10.00 min CN....: 85.00 59.18 min IMPERVIOUS AREA 0.20 AREA..: 0.00 Acres IMPERVIOUS AREA CN. 98 00 0.17 cfs VOL: 0.10 Ac -ft TIME: 540 min BASIN ID: le100 NAME: Exist 100 yr, 24 hr SCS METHODOLOGY TOTAL AREA.......: RAINFALL TYPE....: 1.56 Acres BASEFLOWS: 0.00 cfs PRECIPITATION....: TYPElA PERVIOUS AREA - TIME INTERVAL....: 3.00 inches AREA..: 1.56 Acres TIME OF CONC.....: 10.00 min `59.18 00 ABSTRACTION COEFF:- min 0.20 IMPERVIOUS AREA AREA..: 0.00 Acres PEAK RATE: 0.39 cfs VOL: 0.20 00 Ac -ft TIME: 98 530 min I k0S 6/12/0-6 GROUP FOUR, Inc. page 1 BASIN SUMMARY BASIN ID: 1d002 NAME: Developed 2 yr, 24 hr SCS METHODOLOGY TOTAL AREA.......: 1.24 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE.....: TYPEIA PERVIOUS AREA PRECIPITATION....: 1.50 inches AREA..: 0.38 Acres <; TIME INTERVAL....: 10.00 min CN....: 90.00 TIME OF CONC.....: 10.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA..: 0.86 Acres PEAK RATE: 0.31 cfs VOL: 0.11 CN....: Ac -ft TIME: 98.00 500 min BASIN ID: 1d010 NAME: Developed 10r 24 y hr SCS METHODOLOGY TOTAL AREA.......: 1.24 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE....: TYPEIA PERVIOUS AREA PRECIPITATION....: 2.00 inches AREA..: 0.38 Acres TIME INTERVAL....: 10.00 min CN....: 90.00 TIME OF CONC.....: 10.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA..: 0.86 Acres PEAK RATE: 0.46 cfs VOL: 0.15 CN....: Ac -ft TIME: 98.00 500 min BASIN ID: 1d100 NAME: Developed 100 yr, 24 hr SCS METHODOLOGY TOTAL AREA.......: 1.24 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE....: TYPEIA PERVIOUS AREA PRECIPITATION...-.: 3.00 inches AREA..: 0.38 Acres TIME INTERVAL....: 10.00 min CN....: 90.00 TIME OF CONC.....: 10.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA..: 0.86 Acres PEAK RATE: 0.76 cfs VOL: 0.25 CN....: Ac -ft TIME: 98.00 500 min i kos 6/12/06 GROUP FOUR, Inc. - page 1 ------- ------- BASIN -------------------------------- SUMMARY SCS METHODOLOGY BASIN ID: lb002 NAME: Bypass 2 yr, 24 hr TOTAL AREA.......: 0.32 Acres SCS METHODOLOGY cfs RAINFALL TYPE....: TYPElA PERVIOUS AREA TOTAL AREA.......: 0.32 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE....: TYPElA PERVIOUS AREA PRECIPITATION....: 1.50 inches AREA..: 0.24 Acres TIME INTERVAL..... 10.00 min CN..... 86.00 TIME OF CONC.....: 10.00 min IMPERVIOUS AREA Ac -ft TIME: 500 ABSTRACTION COEFF: 0.20 AREA..: 0.08 Acres CN..... 98.00 BASIN ID: 1b100 PEAK RATE: 0.04 cfs VOL: 0.02 Ac -ft TIME: 500 min IR BASIN ID: lb010 NAME: Bypass 10 yr, 24 hr SCS METHODOLOGY TOTAL AREA.......: 0.32 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE....: TYPElA PERVIOUS AREA PRECIPITATION....: 2.00 inches AREA..: 0.24 Acres TIME INTERVAL....: 10.00 min CN....: 86.00 TIME OF CONC.... • 10.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA..: 0.08 Acres CN..... 98.00 PEAK RATE: 0.07 cfs VOL: 0.03 Ac -ft TIME: 500 min BASIN ID: 1b100 NAME: Bypass 100 yr, 24 hr SCS METHODOLOGY TOTAL AREA.......: 0.32 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE....: TYPElA PERVIOUS AREA PRECIPITATION....: 3.00 inches AREA..: 0.24 Acres TIME INTERVAL....: 10.00 min CN....: 86.00 TIME OF CONC....--: 10.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA..: 0.08 Acres CN....: 98.00 PEAK RATE: 0.34 cfs VOL: 0.05 Ac -ft TIME: 500 min s, The level pool routing summary table is shown below: Detailed stage storage and stage discharge relationships, orifice calc system calculations and a water surface summ ulations, ove Fs. 6 ary are included on the following pag GROUP FOUR, In c. 16030 Juanita_ Woodinville Way NE Bothell, WA 980_11 MATCH <-------- DESCRIPTION INFLOW -STO- -DIS- <-PEAK-> STORAGE�1Z l�Ztog} 0'-(T'( --------- > (Cfs) (cfS) --id- --id- <-STAGE> id VOL (cf) C e 10 ••••.... 0.13 100 ...................... 0.46 tank frop 345.19 7 1519.08 cf O )3 p 32 0.76 tank frop 347.30 8 2326.47 cf Detailed stage storage and stage discharge relationships, orifice calc system calculations and a water surface summ ulations, ove Fs. 6 ary are included on the following pag GROUP FOUR, In c. 16030 Juanita_ Woodinville Way NE Bothell, WA 980_11 7/24/06 GROUP FOUR, Inc. page 2 HYDROGRAPH SUMMARY Dom NS i -a-'C7A M To; 0-F ow, ? u-1 �tj r7 loo I JI - du(--'�' 'v1 f. u-7 o'- PEAK TIME VOLUME HYD RUNOFF OF OF Contrib NUM RATE PEAK HYDRO Area cfs min. cf\AcFt Acres 1 0.165 540 4350 cf 1.56 &X-1 5T 2 -(lz- - 2 _4 b,- 2 0.385 530 8711 cf 1.56 3 0.464 Soo 6683 cf 1.24 -D-,v 10 (R- - 4 0.762 500 10940 cf 1.24 ajel loo Yk 2-k! 5 0.072 500 1169 cf 0.32 pypA�,; ID y1z.- 2 q 6 0.144 500 2164 cf 0.32 pyo A, -S ko 0 7 0.130 610 6590 cf 1.24 VAr_jjkjy uv-rr-k ,gyp 8 0.320 560 10847 cf 1-24 FA -Ty of F. 10 j?0. 172 510 7759 cf 1-57 -q 11 0.385 540 13011 cf 1-57 VjTFt,aw t IOU,/ jAj Dom NS i -a-'C7A M To; 0-F ow, ? u-1 �tj r7 loo I JI - du(--'�' 'v1 f. u-7 o'-