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;i. an infillralion basin, I�SUllahlc soils rxist on thc sitc, <br />h. .i wctpond, <br />c. a conslructcd wctland, <br />d. a SMI Storm�iltcr (scc addilional critcria bclow). <br />1-3. All slormwatcr facilitics shall bc dcsigned in accordancc with City standards. <br />15. An casement will bc rcquircd for com�cyancc of stormwalcr runoff fram thc on-sitc stormwatcr <br />management facilitics to thc sto�m drainagc system in MaJison Strcet. <br />IG. Slvll Stormfiltcr: 7'hc Ciiy will allow thc usc of a Storm���.itcr Managcmcnt, Inc. (SMI) StormPiltcr <br />to mect thc Ciry's stonnwatcr trcatmcnt standards, provided thc dcsign and conswction of the SMI <br />Storm�iltcr mcet lhc follo���ing critcria: <br />;i. The Storinriltcr must bc prccedcd by a pretrcatment ���ctvaulUtank comaining at Ieast 30"Ir, of <br />thc 6-month, 24-hour storm runoff volumc from thc contributing, dcvclopcd drainagc .�rca. <br />h. Thc Stnrm�ihcr must trcat a� Icast thc 6-month, 24-hour slorm. <br />c. 'I�hc SlormPiltcr shall bc dcsigncd using a r.iaaimum (lo��� rale of 7.5 gpm per cartriJgc. <br />�lo���s excecding Ihe dcsign Flow shall be bypassed .�round the system, but should gcncrally <br />pass lhrough thc prctrcatmcnt wctvaulUtank. <br />d. 'I'hc StormFiltcr mcdia shull targct dissoh�cd po!lutants anJ nutricnls us �vell as total <br />suspcndcd solids. As morc effecti��c media bccomc availablc in thc fulure, the StormFiltcr <br />shall hc upgradcd, during routine cariridgc replacemenl, to Wilir.e thcsc improved mcdia. <br />c. Thc SrormPiltcr sh;dl bc dcsigncJ with a minimum of 2.3 fcct of hcad differential bctwccn thr <br />im�crts of thc inlet :md oullct of thc filtcr. Downstrcam hvdraulic calculations will bc <br />performcd to dcmonslratc that downstrcam conditions will not rcducc thc hydraulic putcnii:�l <br />across thc filtcr duc to hackw:�ter effcets. <br />I'. Routine maintcnancc of ihe Storm�iltcr is required. A dctailed operation and maintenancc <br />plan fur the system must be prepureJ for approval hy the City. �� ce�iificate of system <br />m.iintcnancc nu�sl bc suhmittcd io thc City annually. <br />g. Maintenance and upera�ion of Ihe StormFilter on this site shall be adapicd, in the future, to <br />reilect �he curcent kno�vlcdgc regarding this emerging technology. <br />h. All uthcr upplicablc, ;mJ non-con(licting, critcria in thc cwrent cdition of SMI's Product <br />Design Manu:il shall be follo��ed in the design, construction, ;md maintenance of lhe SMI <br />StormPiltcr on this sitc. <br />i. Par StormPihers locaicd do���nstrcam of detention sys�ems, thc SMI mass luading design <br />�iroccdure shall hc ulilir.ed, with thc follu���ing assumptions: <br />i. TSS rcmoval rcyuircd = SO°Ir� <br />ii. Vb = Ihc vulumc of dcad storagc plus thc 7-day aecragc li�c storagc ��olumc Irom thc <br />routing of Ihc G month,'_-1-hour slorm through thc dctcniion systcm (if a 7-day routing <br />is nut :i��:iilablc, usc Vb =��oluntc of dcad sioragcl <br />iii. Vr = thc 6 month. 2�1-hour storni volumc <br />iv. 1I = dcp�h of Vb <br />v. Mcan annual rainl.dl = 37 inchcs <br />vi. Pcrccnl runoff c.ipwrc = 90"r <br />�l� <br />