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LOME RAIN, WE SHINE. S�RMW/ITE� <br /> MANAOEMENT <br /> February 1G,2005 <br /> Santhosh Moolayil <br /> Jay Group Engineering <br /> 1927 5th Street <br /> Marysville,WA 98270 <br /> RE: Review of StormFille:T^+ Design for Nextel Tower project. <br /> This fs to document for the City of Evereri our revfew o(the plans and the proposed <br /> application of the StormFilter al this site as you have requested. <br /> Stormwaler Management, Inc. has reviewed the Stormfilter design for lhe Nextel Tower site. <br /> The storm drainage syslem for this proJect was designed by Jay Group Engineering of <br /> Marysville,WA. We believe the StormFilter'^^ is an appropriate water quality solution for this <br /> site. <br /> The designer reports an impervious drainage area of 0.37 AC.The water quality ftow rate was <br /> determined by Jay Group Engineei ing, using the Santa �arbara Urban Hydrograph method. <br /> The water quality design precipitation of.96"/24-hour was utilized in the basin model.The <br /> design water quality flow rale was delermined to be 0.0699 c(s.The calchbasin SLormFiller <br /> wilh 2 cartridges calted out on the plan will treat up to 0.067 cfs. For conveyance design <br /> purposes,the 100�year conveyance ilow ihrough the vault was determined to be 0,27 cfs <br /> using the basin model.Tliis flowrate is within the internal bypass/conveyance capability of <br /> the system.Thus,no extemal bypass structure is required.Uur syslems require periodic <br /> maintenance lo operale properly. Given typical rooftop/parking lot pollutant loading rates, <br /> Stormwater Management, Inc. recommends maintenance on an annual basis. <br /> The configuration of the StormFilter inlet and outlet pipes is acceptable. The system appears <br /> to be constructi�le and is located in order lo facilitate maintenance activities. In summary, <br /> this filter is eYpected to operate in accordance with Stormwater ManagemenCs design intent. <br /> However,Stormwater Management has not reviewed the hydraulics of the collection system <br /> upsLeam or downstream of the(ilter. <br /> Either you or the City's reviewer may conlact rne i!you liave any questions. <br /> Sincerel � '' <br /> � / ,% <br /> /i�/� �� r. <br /> r Joe Reidy � <br /> Project Designer <br /> 570pMWAlER MANAGEMENT, INC • 12021�B NE AIRPORT WAY. PORTLAND, OR 97220 <br /> PHONF: 800/548�4667 • FAX: 800/561�1271 • STORMWATEFINC.COM <br />