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CØNTECH <br /> ENGINEERED SOLUTIONS <br /> Size and Cost Estimate <br /> Prepared by Chris Hass on July 18,2014 <br /> Silver Lake Center — Stormwater Treatment System <br /> Everett, WA <br /> Information provided: <br /> • Structure ID= Basin A <br /> • Total Area(acre) = 1.83 <br /> • Impervious (acre) = 0.90 <br /> • Water Quality Flow, WQF (cfs) = 0.03 <br /> • Peak Flow, Q100 (cfs) = 0.77 <br /> Assumptions: <br /> • Media = ZPG cartridges <br /> • Per Cartridge flow rate = 5 gpm for the lowdrop and 7.5gpm for the 18" <br /> • Drop required from inlet to outlet = 1.8' for the lowdrop and 2.3' for the 18" <br /> • Presiding agency= City of Everett <br /> Size and cost estimates: <br /> The StormFilter is a flow-based system, and therefore, is sized by calculating the peak water quality flow rate <br /> associated with the design storm. However, when the Storm Filter is placed downstream of detention the flow rate <br /> generated at the water quality storm is not always representative of the total volume of water that will go through the <br /> system or type of pollutant-loading the system may experience in one year. <br /> Water <br /> Structure Quality Approximate C rtNoidges System Size Estimatedo <br /> st <br /> Flow <br /> Basin A 0.03 12.5' 4 60" Manhole $19,935 <br /> The estimated costs are for complete systems delivered to the job site. The final system cost will depend on the <br /> actual depth of the units and whether extras like doors rather than castings are specified. The contractor is <br /> responsible for setting the StormFilter systems and all external plumbing. <br /> 02012'Contech Engineered Solutions LLC 11835 NE Glenn'Aiding Dive, Portland,OR 97220 Page 1 of 1 <br /> www.ContechES.com Toll-free: 800.548.4667 Fax:800.561.1271 TS-P027 <br />