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I <br /> Determining Number of <br /> CO <br /> CONTECH Cartridges for Flow Based <br /> ENGINEERED SOLUTIONS <br /> Systems <br /> CONTECH Stormwater Solutions Inc. Engineer: <br /> Date 8/14/2014 <br /> Site Information <br /> Project Name McClean Ironworks-Smith Island Facility <br /> Project State Washington <br /> Project Location Everett <br /> Drainage Area,Ad 0.62 ac <br /> Impervious Area,Ai 0.55 ac <br /> Pervious Area,Ap 0.07 <br /> Impervious 89% <br /> Runoff Coefficient, Rc 0.85 <br /> Water quality flow 0.09 cfs <br /> Peak storm flow 0.39 cfs <br /> Filter System <br /> Filtration brand StormFilter <br /> Cartridge height 27 in <br /> Specific Flow Rate 1.00 gpm/ft` <br /> Flow rate per cartridge 11.3 gpm <br /> SUMMARY <br /> Number of Cartridges 41 <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> ©2006 CONTECH Stormwater Solutions <br /> contechstormwater.com 1 of 1 <br /> I <br />