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� . <br /> 'fhc followinti> arc the Citv's currcnt dcsi�i rcquiremcnts for use of SMI StormFilters for runoff <br /> trcatmcnr. <br /> I <br /> 1) 1'hc Stom�Filtcr must Uc prcccded by a pretreatmcnt wetvaulUtank containing at least <br /> 30%of thc 6-month, 24-hour slonn runoff volume from the conlributing, developed <br /> , drainagc area; or by another DOE approved protreatment device. <br /> I 2) The StorniPilter must treai, al a minimum, the dcvcloped pcak flow from the contributing <br /> area for thc G-month, 24-hour stonn. <br /> I 3) The Storn�Filter cartridges shall be dcsigned�vith a maximwn flow ratc of 15 gpm per <br /> i cartridgc, if SBUH or a comparable single-event hydrological modcl is used to generatc <br /> thc flows. If thc W WHM is used to gcnerate thc }lows,thc dcsi6m flow per cartridge <br /> ` shall be 7.5 g�mi. High flows shall bc b��asscd around the StorniFilter vault,but should <br /> � gencrally pass lhrough the pretrcatment dcvice. <br /> 4) Tlic StomiPilter media shall target dissolved pollutants and nutricnts, in addition to total <br /> I suspended solids. .4s more effectivc media become availablc in the future, the <br /> IStormPiltcr shall be upgraded,during routine cartridge replaccmcnt,to utilizc thcsc <br /> impiovcd media. <br /> 5) 'The Storn�Filtcr shall bc dcsibnied with the minimum hcad differential betwcen inlet arid <br /> �� outlel that is recommcnded by the manufacwrer for the spccific model used. <br /> Dowustream I�ydraulic calculations �i�ill be perfoimed to demonstrate thal downstremu <br /> � conditions will not rcduce the hydraulic potcntial across lhe filter, lo less than that <br /> I recommended Uy the mmmfacturcr, duc�o backwater cffects. <br /> G) Routinc maintenance of the S�orniFillcr is rcquired. A detailed operation and <br /> i maintenancc plan for thc systcm must bc preparcd for approval by the City. A ceriifcate <br /> � of system maintenancc must Ue submittcd to the City annually. <br /> 7) Maintenancc and operation of thc StomiFilter on d�is sitc shall be adapted, in thc future, <br /> lo rcilect thc cun'ent Y.nowlcdge rcgarding this cmcrging tccluiology, <br /> 8) All oihcr applicablc, and non-conllicling, criteria in thc current cdition of SMI's Product <br /> Dcsign Manual shall Uc followed in the design, consWetion, and maintenance of tl�e SMI <br /> StomiFillcr on this sitc. <br /> I 9) For StomiFilters locatcd do�timstrcam of dctention systems, thc SMI mass loading design <br /> proccdure,�vith thc following assumpiions, sUall be utilized: <br /> a. TSS rcmoval rcquircd = 80% <br /> I b, Vb =t}ic volume oCdcad storagc plus iltc 7-day averagc live storagc volume from <br /> thc routing of lhc 6 month, 24-hour stomi tliirough the dctention system(if a 7-day <br /> routing is uot availaUle, use VU=volume of dcad storage) <br /> '� c. �h=thc runoff volu�ue Gom the mcan anm�al stomi (use precipitation volutnc of <br /> 0.45 inchcs) <br /> d. Depth of water in basin, H=deE>th of Vb <br /> e. n4ean annual rainfall=37 inches <br /> L Yerccnt runoff caplure= 90% <br /> g. lsvcnt bican Concentration(Gn4C)= I UOm�'L <br /> h. Allowablc cartridge flow ratc= 7.5 gpm <br /> i. Mass load per cvtridgc= 3G ]bs <br /> I. Fur chccking that Q�a��c1n tnecl E���«� assmne a parti;,le size disiribulion altei <br /> � prclrcnunent = 5�o sand, S5°�a silt, 10°io clay <br /> S:'yzimmcrm��cord\titonn!'illcr dcsigu.doc <br /> Printcd IIi20/2006 <br />