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d. a 5�11 StonnPiltcr (scc addi'ional critcria bclo���). <br />14. All stomiwatcr facilitics shall bc dcsigncd in accordancc ���ith City standarls. <br />1 �. An easement will bc required for conveyancc of stormwater r�noff Gom thc on-sitc stomi���atcr <br />management facilities to the stomi drainage system in Madison Sireet. <br />16. SMI StonnFilter: The City will allow the use of a Stomiwater Management, [nc. (SMI) StormPiltcr <br />to mect the City's storniwater treatmcnt standards, providcd thc design and construction of thc SM 1 <br />StormPilter meet the following criteria: <br />a. Thc StorniPilter must bc preccded by a pretrcatment �vetvault/tank containing at lc�st 30'�0 of <br />the G-month, 2d-hour storni runoff velume from thc contributing, de��claped drainage arca. <br />b. Thc StonnPiltcr nwst treat at Icast thc G-month, 24-hour stonn. <br />c. Thc StormFiltcr shall bc dcsigned using a maximum ilow ratc of 7.5 gpm per cariridgc. <br />Flows excecding the design (low shall bc bypassed around ihe systeni, but should gencr�lly <br />pass through the pretreatment wetvaulUtank. <br />d. The StomiFilter media shall larget dissolved pullutants and nutricnts as �vell as total <br />suspended solids. As morc cffective media become available in the future, the StorniFilter <br />shall be upgraJed, during routine cartridge replacement, to utilize these improved media. <br />c. Thc StormPiltcr shall bc designcd with a minimum of 2.3 fect of head differential betwcen thc <br />invcrts of Ihe inlet and outict of die filtcc Downstream hydraulic calculations ���ill be <br />perfonned to dcmonstrate that do�vnstream conditions will not reduce the hydrauhc potcntial <br />across thc filtcr duc to backwatcr cffects. <br />f. Routine maintcnance of the StonnFiltcr is requircd. A detailed operation and maintenancc <br />plan for the system must bc preparcd for approval by thc Ciry. A certi ficate of system <br />maintcnancc must bc submitted to thc City annually. <br />g. Maintenance anJ operation of the StorniFiltcr on this site shall bc adapted, in Aie futurc, to <br />re(lect thc current knowlcdgc regarding this emerging technology. <br />h. All othcr applicablc, and non-conllicting, critcria in thc currcnt cdi;ion of SMPs Product <br />Dcsign Manual shall bc followcd in thc dcsign, construction, and maintenancc of thc SM[ <br />Storni�illcr on this sitc. <br />i. i'or StonnFiltcrs locatcd downstrcam of detention systems, the SMI mass loading design <br />procedure shall be utili�ed, with the following assumptions: <br />i. TSS removal rcyuircd = SO"/o <br />ii. Vb = thc volumc of dead s�oragc plus the 7-day averagc live storagc volume from thc <br />routing of the G month, 24-hour stonn through the detention system (if a 7-day routing <br />is not a��ailablc, usc Vb = volumc of dcad storagc) <br />iii. Vr = thc 6 month, 24-hour stonn �olumc <br />iv. li = dcpth of Vb <br />��. Mcan annual rainfall = 37 inches <br />vi. Pcrcent runoff capture = 90% <br />��ii. Bvent mean concenlration (EMC) = 100 mf;/L <br />viii. Allo���ablc cartridgc flow ratc = 7.5 gpm <br />ix. Mass load rer cartridgc = 3G Ibs <br />� <br />