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culculaled using thc latest ��crsion of thc Westcrn Washington Ilydrology Modcl <br /> or othcr Gcology-upprovcd continuous runoff modcl(c.g. MCS Flnod). Notc <br /> Ihnt i(singlc c�cnt mcthods arc uscd to estimatc runoff Oowratcs,Figures 9.6a <br /> und 9.6b in Volumc V of thc 2005 Stormwatcr Mnnugcmcnt Mnnual for Wcstcrn <br /> Wnshin�ton should bc uscd to aJjust thc penk singlc cvcnt Ilow rntc for <br /> culculatinn purposcs. 7'his is donc by Jh�iding thc pcuk 10 minulc Oow rutc <br /> prcdictcJ b}•thc singlc e�•ent mclhocl by Ihe rutio inJicuteJ in Figurc 9.6u for on- <br /> linc dcsigns,or Figurc 9.6b for off-Iinc designs. Thc 6-month,2�-hour rainfnll <br /> amount for ihc projcct sitc must bc know�n to idcntify thc appropriutc rntio. Thc <br /> adjusled Ilnw rute is thcn Ji�ided by thc approved cartriJge Oow rulc(Tahle I) <br /> ro computc thc numbcr of cnrtrid�cs neccssary. Notc: This mcthod is not <br /> upplicnblc for Tustcrn �Vashington. <br /> 2. Fnr SlurmFilter sy�stems to bc Incutcd downstrcnm of u stormwntcr dctenfion <br /> facility,Ihc SlormFiltcr sizc s6ull bc cnlculuteJ usin� both Ihc OoN•-bascJ und <br /> mass-bascd mcthods us dcscribed in thc CONTF.CH Producl Design Alununl <br /> Versinn 4J (April2ll06J,or most currcnl ��crsion,and the Jesi�ncr shull sclecl <br /> thc result y�iclding thc I��rgcr numbcr of cuHridgcs. <br /> 3. StormFillcr syslcros shall bc instulled in such n manncr Ihut Ilows c:cecJing ihc <br /> Nutcr quulily irenlmcnt rutc urc bypusscd or will not resuspcnJ cupturcJ <br /> scdimcnts. SlormFillcr systcros sh:dl bc Jcsigncd in nccorduncc with thc <br /> performnncc goals in F.colo�'s most reccnt titormwntcr 111unual unJ <br /> CON'17?CH's ProJuc!Dcsign Afu�iuu! Vrrsion 4J (Apri!i0!16J,or most currcnt <br /> �crsion, unlcss othcncisc spccificJ. Thc dcsign, prclreutmcnt, Ia�nJ usc <br /> npplication,nnd nu�inlcnancc critcriu in CONTIiCII's Dcsign Manual must bc <br /> clnscl�' folln�rctl. <br /> d. Prclrcahnenl of Ttiti �md uil und grense mu�� be necessary,unJ shull bc proviJcd <br /> in accorJ��ncc rrith ihc most current ccrsions of thc CONTECII's Prod��c! <br /> Ucsig�t Maiiui�!(.4pri!2006) ur thc applicablc F.colagy Slorm��atcr Alunual, and <br /> usin{;Ihc perfnrm:�ncc critcria anJ prctrcnimcnt prncliccs provided on <br /> I:culog�'s"li�ahuitiun of I:mcr�ing tilorm��ulcr 7'rcutmcnt 7'cchnnlogics" <br /> ��cbsilc. <br /> 5, tilarmFiltcr s�stcros nrc t}picully dcsi�ncd to bc nwintuincd on un annuul bnsis, <br /> ��hich shall scrvc ns thc JeGmlt ms�intcnancc (rcyucnc��. 111aintcnuncc includcs <br /> remncin� accumulated seJimenl frnm Ihc �nult, nnd replucing spcnt curtridgcs <br /> ��ilh rechur�cJ cartrid{;cs. <br /> In licu of annuol nuiintcnancc,inspcclions ain bc uscd to ddcrminc n sitc- <br /> spccific nu�intciu�ncc schcdulc�mJ/or requirements, 11'hen inspcctions arc <br /> perfunncd,thc follmrinR findin�s shull scn•c as mnintenuncc triggcrs: <br /> ��) Accumulatcd �'+�ult scdimcnl dcptlis cacccd un u�•crugc of 2 inchcs,nr <br /> b) Accumul��ted seJimcnt Jcpths on the tops of thc cartridges escccd nn <br /> n�crn�c of(I.S inchcx,ar <br /> c) titandin���:itcr rcmains in thc�ault bct��ecn rnin c�•cnts. <br /> _ . , <br />