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Item 28 - GPA No. 2020-07, AA No. 2020-05 - Westview Housing
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Item 28 - GPA No. 2020-07, AA No. 2020-05 - Westview Housing
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City Clerk
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Agenda Packet
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Clerk of the Council
Item #
28
Date
1/19/2021
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Monle taAo U " <br />3 <br />x <br />V i <br />Westminster Are Westminster Ave <br />_, Westminster Aver ' Wespminater AvcWesimirister Ave ,.. <br />�"Y sa„ta <br />a� <br />h <br />x <br />Aru <br />a <br />O <br />Ninlmall <br />a <br />� <br />� <br />"arbor Pointe Bo <br />z <br />Keel 0.ve � Q <br />W t6:M1 <br />r <br />9LP <br />� <br />Q <br />cl <br />\/IrInIITY KAAP SITE <br />LEGEND: <br />DMA AREA - ROOF / AC <br />DMA AREA - LANDSCAPE <br />DIRECTION OF FLOW <br />PROPERTY LINE/DRAINAGE <br />AREA BOUNDARY <br />— CENTERLINE <br />AREA SUMMARY / COMPARISON <br />DESCRIPTION EXISTING PROPOSED <br />DIFFERENCE <br />HARDSCAPE/IMPERMEABLE 50,197 SF 71,467 SF <br />+20,855 <br />LANDSCAPE/PERMEABLE 39,070 SF 18,215 SF <br />TOTALS 89,682 SF 89,682 SF <br />AREA CLASSIFICATION <br />TOTAL <br />NEW IMPERVIOUS AREA <br />20,855 SF <br />TOTAL IMPERVIOUS AREA <br />71,467 SF <br />SOURCE CONTROL BMPS: STRUCTURAL SOURCE CONTROL BMPS: <br />SC-34 WASTE HANDLING & DISPOSAL (INTERNAL SD-11 ROOF RUNOFF CONTROLS (ROOF DRAIN <br />TO BUILDING) LOCATIONS TBD) <br />SC-41 BUILDING & GROUNDS MAINTENANCE SD-12 EFFICIENT IRRIGATION <br />SC-43 PARKING / STORAGE AREA MAINTENANCE SD-13 STORM DRAIN SIGNAGE <br />SC-60 HOUSEKEEPING PRACTICES SD-32 TRASH ENCLOSURE (INTERNAL TO BUILDING) <br />SC-71 PLAZA AND SIDEWALK CLEANING <br />SC-73 LANDSCAPE MAINTENANCE <br />SC-75 WASTE HANDLING AND DISPOSAL NON-STRUCTURAL SOURCE CONTROL BMPS: <br />(INTERNAL TO BUILDING) N3 (SC-73) COMMON AREA LANDSCAPE <br />MANAGEMENT <br />N4 BMP MAINTENANCE <br />N7 (SC-11)SPILL CONTINGENCY PLAN <br />N11 (SC-60) COMMON AREA LITTER CONTROL <br />N14 (SC-74) COMMON AREA CATCH BASIN <br />N15 (SC-43, SC-70) STREET SWEEPING PRIVATE <br />STREETS AND PARKING LOTS <br />PRETREATMENT/GROSS SOLIDS REMOVAL BMPS <br />PRE-2 CATCH BASIN INSERT <br />DMA DCV CALCULATIONS <br />DCV = C X D_FRACTION X A X 43560 SF/AC X 1/12 IN/FT <br />WHERE: <br />DCV = DESIGN STORM CAPTURE VOLUME, CU-FT <br />C = RUNOFF COEFFICIENT = (0.75 X IMP + 0.15) <br />IMP = IMPERVIOUS FRACTION OF DRAINAGE AREA (RANGES FROM 0 TO 1) <br />D = STORM DEPTH (INCHES) <br />DRAWDOWN BMPS, THE DCV FRACTION, X1, IS 0.96. <br />D FRACTION = D X 0.96 = 0.768 IN <br />A = TRIBUTARY AREA (ACRES) <br />DRAINAGE AREA 1 <br />C = 0.75 X 0.865 + 0.15 = 0.737 <br />D = 0.8 <br />A = 2.059 <br />DCV = 0.737 X 0.8 X 2.049 X 43560 SF/AC X 1/12 IN/FT = 4,470 CU-FT <br />VOLUME: <br />DESIGN CAPTURE VOLUME = 4,470 CU-FT <br />PER CAPTURE EFFICIENCY METHOD FOR VOLUME -BASED BMPS <br />PROPOSED ADS STORMTECH VOLUME = 4,587 CF <br />(WQMP SITE PLAN SHOWS A CHAMBER THAT IS OVERSIZED). <br />NOTES: <br />1. THE BMPS, AS SHOWN ON THE APPROVED SITE PLAN ARE ONLY PRELIMINARY <br />AND WILL BE REVISED OR MODIFIED AS NECESSARY UPON COMPLETION OF THE <br />WQMP. PRIOR TO THE ISSUANCE OF THE GRADING PERMIT, THE APPROVED <br />GRADING/UTILITY PLAN SHALL INCORPORATE ALL REQUIRED STRUCTURAL BMPS. <br />FOR ASSISTANCE AND AN INFORMATIONAL HANDOUT (INCLUDING A WQMP <br />TEMPLATE). <br />2. THIS SITE WILL BE DESIGNED AND CONSTRUCTED IN ACCORDANCE WITH THE <br />CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD SANTA ANA REGION <br />ORDER NO. R8-2009-0030 DISCHARGE REQUIREMENTS (MS4 PERMIT). <br />0 10 20 40 <br />. 1" = 20' <br />SCALE ' <br />Lu <br />Q <br />LJJ <br />uj <br />a <br />U <br />Lu <br />cC <br />G <br />O <br />U <br />O <br />LL <br />w z <br />V <br />V <br />Z <br />0 <br />Q <br />Lu <br />E <br />O <br />00 o0 U <br />� N -6 <br />rn ;' o <br />U <br />N U (p <br />-0o-) E <br />CB <br />C) .L Q <br />FOR AND ON BEHALF <br />OF WARE MALCOMB <br />U) <br />1..` <br />co <br />5 <br />z <br />m <br />LL <br />Q <br />Q <br />Q <br />z <br />Lr j <br />fQ/� <br />v J <br />L1 <br />O <br />Q <br />J <br />� <br />L1J <br />Lu <br />L1J <br />z <br />0 <br />U) <br />Lu <br />z <br />� <br />N <br />C� <br />O <br />Lo <br />JOB NO.: <br />IRV20-4009 <br />PA / PM: <br />LC <br />DRAWN BY: <br />AN <br />DATE: <br />11 /04/2020 <br />PLOT DATE: <br />SHEET <br />C500 <br />ISheet 6 of 8 I <br />
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