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�; -- (� <br />I�� tow[ e+�M. wc sw�xtr �{�STORMW�IFRt' . <br />L`--_ _— _-- __ 1_ �� _— — . �.o <br />Determining Number af Cartridges for Systems Downstream of Detention <br />project: Mounlnin View Plaza Dete: lune 27. 2005 <br />LocaUon: Everelt, WA SMI Enqc: Lora Leligdon <br />Step 1 <br />5tep 2 <br />Step 3 <br />Slep 4 <br />Step 5 <br />Step 6 <br />Step 7 <br />Step 8 <br />De(ermine maRlmum releese rate from detenUon <br />Q�CM:dSlRN �Lf$� Q.QZ <br />Determine Veatment teleasa �ste fmm detentlan <br />Qrt�eeseueai:��s) 0.03 <br />Inputthe percentege of polWtnnt removal repulred <br />�e��, � 80% <br />Calculate DreVeatment removel efliclency using FHWA meVioU <br />Volume o( setUing basin, W �(t'1 ��—��'1 <br />Runoff Volumc, Vr (ft�) �J <br />qatio ol Vb/Vr 1'� <br />Depth ol waler in basin. H(fq �� <br />Pretrealment Efficiency. E,,, �'� <br />(not to excced 5U°5, see attoched granh) <br />ColCulale the ennunl mass bad <br />Mean Annual RaiMall, P(In) 37 <br />Site Aren. A (acresl � 2'S <br />ImperviousArea(acresl I "� <br />Percent Impervious (%) 7z <br />Composite Runolf Coellicienl, C � 070 <br />Pcrcent Runolf Caplure �J <br />Mean Mnual RunoO,V� (It�l 210,934 <br />Even� hlean Concentralion of Pollutant. EMC (mgip 100 <br />Annual M11as5 Lwd. �1��.i O�) 1.316A2 <br />Cnlculnta the number of cnnriAges on o massdoadiny basis <br />Mass mmoved 6y pretrealment system, At,,,� Ilbs) GS&.01 <br />M�ss load lo filMrs a(ter preVealment. M�essi Ilbsl G58.01 <br />Estimate the re�uireA filter elliciency, E�,�r 60?e <br />hlass to be caplurea by lilters, M„nr Obs) 394.81 <br />AllowaUle Cartritlge Flrnv rnte, Qr„�(gPm) �•5 <br />Check that Q�„� can meet E�,�„ OK <br />Ma551oatl per carlridge. Mun pin) 36 <br />Number ol Canritlges requiretl, N,,,,,, 11 <br />Treatment Capaciry (cls) �'� <br />Determine Altical SlzingValue <br />Number ol CartriOges using Q,r�.,�u�,n N�. �� <br />Chose Met�od \Ylth Mosl Number oi Certrldges <br />Melhotl to Use: MASSlOA�ING <br />SUMMARY <br />Treatment Flow Rate O.1F <br />Cartndge Flow Rate �'S <br />Number of CartritlRes 11 <br />Ll,ov��c-F �rr,��{-f�z^ks <br />3o49cF per FHwPt nnc+b+.�t�/�S <br />(mua��;ec„cl�af{, - c,��;�). <br />Page 1 <br />2/ <br />