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EXHIBIT B: STORMWATER MAINTENANCE AGREEMENT <br />DATE <br />MFS UNIT CALCULATIONS <br />SCALE <br />AS SHOWN <br />WA TER QUA Ll TY STORM EVENT F OW ESAMA TE <br />REDWOOD CITY CALIFORNIA <br />DR. BY <br />MEDIA Fll TRA A0N SYSTEM (MFS <br />KI ER & WRIGHT <br />Calcula#ian%Estimation of R0ofT Flow from the WASE <br />A15145-2 <br />Rational Method- (Q wq = C x I wq x A) <br />SHEET NO. <br />C = Runoff Coefficient (Average), non—dimensional <br />3350 Scott Boulevard, Building 22 (408) 727 6665 <br />l wq = Rainfall Intensity of Woter—Quality Storm Event, in/hr <br />Santa Clara, California 95054 fax (408) 727 5641 <br />A = Catchment Area Size (Total), Acres <br />OF <br />Qwq = Water—quality Storm Event (WASE) Discharge Flow, cfs (per unit) <br />TREATMENT UNIT CALCULATION (DMA03) <br />Site SpeciRc 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 />l wq = 0.2 in/hr <br />A = 0.81 acres <br />Qwq = 0.15 cfs (per unit) <br />Cartridge Calculation <br />NNnw = Qfr�atmer,e (449 gpm/cfs/ Quarbgpm/cart) <br />ld <br />= (0.15 cfs) x (449 gpm/cfs % l�gpm/cart) = 3.74 <br />= 4 Cartridges Required <br />Selection of Structural Storm Water Treatment Device <br />MFS Model = fLOGARD PERK RTL TER — <br />072" MANHOLE UN17S W/ <br />(4) 18" CARTRIDGES EACH <br />Treatment Capacity = 0.16 CFS <br />EXHIBIT B: STORMWATER MAINTENANCE AGREEMENT <br />DATE <br />DEC. 2019 <br />SCALE <br />AS SHOWN <br />FOR: ROEM DEVELOPMENT CORP. <br />REDWOOD CITY CALIFORNIA <br />DR. BY <br />JZ <br />KI ER & WRIGHT <br />JOB <br />A15145-2 <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 />