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iii. Temporarybasinsmayberemovedwhenpermanentcoverhasreducedtheacreageof <br />disturbedsoilstolessthan10(or5whenapplicable)acresdrainingtoacommonlocation. <br />iv. Mustprovidelivestorageforacalculatedvolumeofrunofffromatwo(2)year,24hour <br />stormfromeachacredrainedtothebasin,exceptthatinnocaseshallthebasinprovide <br />lessthan1,800cubicfeetoflivestorageperacredrainedtothebasin. <br />v. Wherethetwo(2)year,24hourstormrunoffamountisnotcalculated,thetemporary <br />sedimentbasinmustprovide3,600cubicfeetoflivestorageperacreoftheĬğƭźƓƭ͸ <br />drainagearea. <br />vi. Outletsmustbedesignedtopreventshortcircuitingandthedischargeoffloatingdebris. <br />vii. Theoutletstructuremustbedesignedtowithdrawwaterfromthesurfacetominimize <br />thedischargeofpollutants.Theuseofasurfacewithdrawalmechanismmaybe <br />temporarilysuspendedduringfrozenconditions.Thebasinmustincludeastabilized <br />emergencyoverflowtopreventfailureofpondintegrity. <br />viii. Energydissipationmustbeprovidedforthebasinoutletwithin24hoursafterconnection <br />toasurfacewater. <br />ix. Temporarysedimentbasinsmustbesituatedoutsideofsurfacewatersandincludea <br />bufferzonenotlessthan100linearfeetfromspecialwaters. <br />x. Thetemporarybasinsmustbeconstructedandmadeoperationalpriortodisturbing10or <br />moreacresofsoildrainingtoacommonlocation. <br />xi. Whereatemporarysedimentbasinmeetingtheaboverequirementsisinfeasible, <br />effectivesedimentcontrolssuchassmallersedimentbasins,and/orsedimenttraps,silt <br />fences,vegetativebufferstrips,oranyappropriatecombinationofmeasuresmustbe <br />installedasdictatedbyindividualsiteconditions,includingalldownslopeboundariesand <br />sideslopeboundaries.Indeterminingwhetherinstallingasedimentbasinisinfeasible, <br />theowner/operator(s)mustconsiderpublicsafetyandmayconsiderfactorssuchassite, <br />soils,slope,andavailableareaonsite.Thedeterminationofinfeasibilitymustbe <br />documentedinthesiteplan. <br />3. PostConstructionStormwaterManagement <br />a. SubmittalofSitePlansconsistingofPostConstructionPlans ΝLƷĻƒƭЋЉ͵ЍͲЋЉ͵ЊАͲ <br />ğƓķЋЉ͵ЋЉΞ <br />i. Siteplansmustbesubmittedforreviewandconfirmationthatordinancerequirements <br />havebeenmet,priortostartofconstructionactivity.ΝLƷĻƒЋЉ͵ЍΞ <br />ii. Siteplansmustconsistof,ataminimum,thefollowingitems:ΝLƷĻƒЋЉ͵ЋЉΞ <br />1) Allcalculationsforthepermanentstormwatertreatmentsystem; <br />2) Thewaterqualityvolumethatwillbetreatedthroughvolumereductionpractices; <br />3) Rationaleanddocumentationsupportingthelocationofanyoffsitepermanent <br />stormwatertreatmentprojects; <br />4) Ifapplicable,theamountpaidtothe CityofCenterville forinlieuofoffsite <br />treatmentunderPart3.b.viiI.4.;and <br />5) AlllegalmechanismsrelatedtoPart3.c.(LongtermMaintenance). <br />March2024|wqstrm498 <br />Page 15 of 23 <br /> <br />