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O.D. - rcir,12 <br />DATE <br />MFS UNIT CALCULATIONS <br />EXHIBIT B: STORMWATER MAINTENANCE AGREEMENT <br />WATER QUALITY STORM EVENT FLOW ESTIMATE <br />SCALE <br />AS SHOWN <br />MEDIA FIL TRA 77ON SYSTEM (MFS) <br />DR. BY <br />JZ <br />Calculation stimation of Runoff Flow from the W SE <br />k KIER & WRIGHT <br />Rational Method: (Q wq = C x l wq x A) <br />Al5145-2 <br />C = Runoff Coefficient (Average), non—dimensional <br />SHEET NO, <br />f wq = Rainfall Intensity of Water—Qualify Storm Event, in/hr <br />3350 Scott Boulevard, Building 22 (408) 727 6665 <br />A = Catchment Area Size (Total), Acres <br />Santa Clara, California 95054 fax (408) 727 5641 <br />Qwq = Water—Quality Storm Event (WASE) Discharge Flow, cfs (per unit) <br />OF <br />TREATMENT UNIT CALCULATION (DMA03) <br />Site Specitic_Runoff Coefficient &Catchment Area Size <br />impervious Surface = 34,607 SF <br />Pervious Surface = 788 SF <br />Total Area = 35,395 SF <br />Variable Value Unit <br />C = 0.9 Non—dimensional <br />1,,,q = 0.2 in/hr <br />A = 0.81 acres <br />0 ,q = 0.15 cfs (per unit) <br />Cartridge Calculation <br />Nfio, = Qb-,,t..t (449 gpm/cfs / Q gpm/cart) <br />= (0.15 cfs) x (449 gpm/cfs / T gpm/cart) = 3.74 <br />= 4 Cartridges Required <br />Selection of Structural Storm Wafer Treatment Device <br />MFS Model = FLOGARD PERIL FILTER — <br />072- MANHOLE UNITS W/ <br />(4) 18- CARTRIDWS EACH <br />Treatment Capacity = 0.15 CFS <br />DATE <br />EXHIBIT B: STORMWATER MAINTENANCE AGREEMENT <br />DEC. 2019 <br />SCALE <br />AS SHOWN <br />FOR: ROEM DEVELOPMENT CORP. <br />DR. BY <br />JZ <br />REDWOOD CITY CALIFORNIA <br />k KIER & WRIGHT <br />JOB <br />Al5145-2 <br />CIVIL ENGINEERS & SURVEYORS, INC. <br />SHEET NO, <br />3350 Scott Boulevard, Building 22 (408) 727 6665 <br />Santa Clara, California 95054 fax (408) 727 5641 <br />1 <br />OF <br />