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Siz� and Cost Estimate <br /> Prepared by Kathryn Thomeson on June Y8,TOOB <br /> Magnum Commercial — Stormwater Treatment System <br /> Everett, WA <br /> Informatlon provided: <br /> • Siructure ID = CB e CB 14 <br /> • Total Area (acre) = 0.985 0.385 <br /> • Impervious Area (acres)= 0.42 0.44 <br /> • Water�uality Flow, WQF (cfs) = 0.10 0.70 <br /> • Peak Flow, �100(cfs) _ <1 <1 <br /> • Height of caAridge (inches) 18 18 <br /> • Cartridge flow rate (gpm) 7.5 7.5 <br /> • Drop required from Rim to outlet (feel) 2.3 2.3 <br /> Asaum ptions: <br /> • Madia = 2PG cartridges <br /> • Presiding agency =City of Everett <br /> Size and cost estimates: <br /> The StormFilter is a ilow•based system, and iherefore, is sized by calculatirg ihe peak water quality flow rate <br /> associated with the design storm. The water quality Ilow rate was calculated by using Figure 9.6a in Volume V o(ihe <br /> 2005 Stormwater Management Manual for Westem Washington using a ratio of 1.54. <br /> Water <br /> Structure Approximate No. of Estimated <br /> �p Quality Depth Cartridges Syatem Size Coat <br /> Flow <br /> CB 8 0.10 2.3' 4 Catchbasin $16,800 <br /> CB 14 0.10 2.3' 4 Cetchbasfn 318,800 <br /> The estimated costs are for complete systems delivered to ihe job si,�. The contracbr is responsible for setling the <br /> StormFilter systems and all extemal plumbing. <br /> �2006 CONTECH Sloimwaler Solutions 12021�8 NL Aupurl Way.Portland OR 87220 Page 1 of 1 <br /> contrchstormwaler com 1o16Lee B00 5�B 1667 Fa� 000 561.1471 TS�P0Y7 �� <br /> ���i�� <br />