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--- - --- - __ _ <br />_ -----___--.--- <br />, „ <br />COME RAIN, WE SHINE'" ' '1� � <br />' �,;� STORMWATER � ' <br />�� M4NAGEMENIINC.! <br />.I <br />Horizon Bank - Stormwater Treatment System <br />Size and Cost Estimate <br />Everett, Washington <br />In(ormation nrovided: <br />• Total contributinp, area = 1.08 acres <br />• Impervious area = 0.8uCi acres <br />• Presiding agency = Citp oi Gverett. 4Vashinglon <br />Assumotions: <br />• Media = Perlile cartridges <br />• Cartridge (low rate = 15 gallons per minute <br />• Drop requircd from inlet to outlet = 2.3' minimum <br />Size_�nd cost estimates: <br />The StormFilter is a^�xv-based system, and therefore. �s sizecl by calculating the peak ���ater <br />quality flow rate associated with the design storm. The water qualiry flow rate was calculated <br />and provided by+he engineer. <br />The StormFilter for this site was sized based on a treatment flow rate of 0.15 cfs. To <br />accommodate this flow rate. Stormwater Managen;�nt recommends using a 6' x 8' prec�sl <br />SrormFiltcr �.vith 5 cartridges. 1he estimated cost of this system is 516.900. r,omplelu and <br />delivered to thejob site. lhis estimate assumes Iha[ the vault is less than 10 feet d�ep. Tlie <br />(inal system cost will depend on the actual depth n( the unrts and whether extras like doors <br />rather than castings are specdicd. The contrector is responsible for setting lhe StormFilter <br />vault and all extemal plumbing. <br />The precast StormFilter has an internal byp2ss capacity of 1.$ cfs. I( the peak discharge off <br />the site is expected to excead th2? rate, we recommend placing a high-floa, bypass upstream <br />of the StormFilter system. Storm�vater Management could provide our high flow bypass. Ihe <br />SlormGate. �;hir,h provides a combination �veir�oriflc�� ,rontrGl Structure lo li�nit lhC flOw to the <br />StormFiller, for appro.�imatel� hd,000. �Ilie final cust tvoulU depenU en tho aclual depth and <br />size o( lhe unil. <br />5�11 E'�'GR: TE��1 :1,'1'1,�05 <br />