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C=a►=NTECH <br /> • <br /> ENGINEERED SOLUTIONS Size and Cost Estimate <br /> Prepared by Chris Hass on July 23,2014 <br /> Silver Lake Center — Stormwater Treatment System <br /> Everett, WA <br /> Information provided: <br /> • Structure ID = CB-18 CB-17A CB-15 CB-14A <br /> • Total Area = 0.76 0.57 0.64 0.33 <br /> • Impervious Area = 0.56 0.36 0.47 0.22 <br /> • Water Quality Flow, VVQF = 0.09 0.05 0.08 0.03 <br /> • Peak Flow, Q25 = 0.34 0.24 0.26 0.14 <br /> • Presiding agency= City of Everett <br /> Assumptions: <br /> • Media = ZPG cartridges <br /> • Drop required from Rim to outlet= 2.3' for the 18" cartridge and 3.05' for the 27" cartridge <br /> Size and cost estimates: <br /> The StormFilter is a flow-based system, and is therefore sized by calculating the peak water quality flow rate <br /> associated with the design storm. The water quality flow rate was calculated by the consulting engineer using <br /> VWVHM and was provided to Contech Engineered Solutions LLC for the purposes of developing this estimate. <br /> Structure Water Cartridge No. of System Estimated <br /> ID Quality Height Cartridges Size Cost <br /> Flow <br /> CB-18 0.09 27" 4 SFCB $16,700 <br /> CB-17A 0.05 18" 3 SFCB $12,400 <br /> CB-15 0.08 27" 3 SFCB $14,400 <br /> CB-14A 0.03 18" 2 SFCB $9,880 <br /> The contractor is responsible for setting the CatchBasin StormFilter and all external plumbing. The steel <br /> Catch Basin Storm Filter has an internal bypass capacity of 1.0 cfs, which does not exceed the peak flows from <br /> this site. <br /> ©2012 Contech Engineered Solutions LLC 11835 NE Glenn Wading Dr, Portland OR 97220 Page 1 of 1 <br /> www.ContechES.com Toll-free: 800.548 4667 Fax 800.561.1271 TS-P037 <br />