Exhibit K - General Construction Permit

General Construction Permit

Icertifythistobeatrueandaccuratecopyofthe officialdocumentsasfiledintherecordsoftheOhio EnvironmentalProtectionAgency.

By:Date:04/11/2023

EffectiveDate: ExpirationDate:

OHIOENVIRONMENTALPROTECTIONAGENCY

GENERALPERMITAUTHORIZATIONFORSTORMWATERDISCHARGESASSOCIATED WITHCONSTRUCTIONACTIVITYUNDERTHENATIONALPOLLUTANT DISCHARGEELIMINATIONSYSTEM

IncompliancewiththeprovisionsofthefederalWaterPollutionControlAct,asamended(33 U.S.C.Section1251et.seq.hereafterreferredtoas"theAct")andtheOhioWaterPollution whereconstructionactivityisbeingconducted,asdefinedinPartI.Bofthispermit,are authorizedbytheOhioEnvironmentalProtectionAgency,hereafterreferredtoas"OhioEPA," todischargefromtheoutfallsatthesitesandtothereceivingsurfacewatersofthestate withtheconditionsspecifiedinPartsIthroughVIIofthispermit.

Ithasbeendeterminedthataloweringofwaterqualityofvariouswatersofthestateassociated withgrantingcoverageunderthispermitisnecessarytoaccommodateimportantsocialand economicdevelopmentinthestateofOhio.InaccordancewithOAC3745-1-05,thisdecision wasreachedonlyafterexaminingaseriesoftechnicalalternatives,reviewingsocialand economicissuesrelatedtothedegradation,andconsideringallpublicandintergovernmental commentsreceivedconcerningtheproposal.

Thispermitisconditioneduponpaymentofapplicablefees,submittalofacompleteNOI applicationform,development(andsubmittal,ifapplicable)ofacompleteStormwaterPollution PreventionPlan(SWP3)andwrittenapprovalofcoveragefromthedirectorofOhioEPAin -38-02.

AnneM.Vogel Director

C.RequiringanindividualNPDESpermitoranalternativeNPDESgeneralpermit..............................................5

PARTI.COVERAGEUNDERTHISPERMIT

A.PermitArea.

ThispermitcoverstheentireStateofOhio.AppendicesAandBofthispermitcontainadditional watershedspecificrequirementsforconstructionactivitieslocatedpartiallyorfullywithintheBig DarbyCreekWatershedandportionsoftheOlentangyRiverWatershed.

B.Eligibility.

1.Constructionactivitiescovered.ExceptforstormwaterdischargesidentifiedunderPart I.B.2,thispermitmaycoverallnewandexistingdischargescomposedentirelyof stormwaterdischargesassociatedwithconstructionactivitythatentersurfacewatersof thestateorastormdrainleadingtosurfacewatersofthestate.

Forthepurposesofthispermit,constructionactivitiesincludeanyclearing,grading, excavating,grubbingand/orfillingactivitiesthatdisturboneormoreacres.Discharges fromtrenchdewateringarealsocoveredbythispermitaslongasthedewateringactivity iscarriedoutinaccordancewiththepracticesoutlinedinPartIII.G.2.g.ivofthispermit.

Constructionactivitiesdisturbingoneormoreacresoftotallandorwilldisturblessthan oneacreoflandbutarepartofalargercommonplanofdevelopmentorsalethatwill ultimatelydisturboneormoreacresoflandareeligibleforcoverageunderthispermit. Thethresholdacreageincludestheentireareadisturbedinthelargercommonplanof developmentorsale.

Thispermitalsoauthorizesstormwaterdischargesfromsupportactivities(e.g.,concrete orasphaltbatchplants,equipmentstagingyards,materialstorageareas,excavated materialdisposalareas,borrowareas)provided:

a.Thesupportactivityisdirectlyrelatedtoaconstructionsitethatisrequiredto haveNPDESpermitcoveragefordischargesofstormwaterassociatedwith constructionactivity;

b.Thesupportactivityisnotacommercialoperationservingmultipleunrelated constructionprojectsanddoesnotoperatebeyondthecompletionofthe constructionactivityatthesiteitsupports;

c.Appropriatecontrolsandmeasuresareidentifiedinastormwaterpollution preventionplan(SWP3)coveringthedischargesfromthesupportactivity;and

d.ThesupportactivityisonorcontiguouswiththepropertydefinedintheNOI (offsiteborrowpitsandsoildisposalareas,whichserveonlyoneproject,donot havetobecontiguouswiththeconstructionsite).

2.Limitationsoncoverage.Thefollowingstormwaterdischargesassociatedwith constructionactivityarenotcoveredbythispermit:

a.Stormwaterdischargesthatoriginatefromthesiteafterconstructionactivitieshave ceased,includinganytemporarysupportactivity,andthesitehasachievedfinal

stabilization.Industrialpost-constructionstormwaterdischargesmayneedtobe coveredbyanNPDESpermit;

b.Stormwaterdischargesassociatedwithconstructionactivitythatthedirectorhas showntobeormayreasonablyexpecttobecontributingtoaviolationofawater qualitystandardandsuchdischargewouldbeaviolationofthispermit;and

c.StormwaterdischargesauthorizedbyanindividualNPDESpermitoranother NPDESgeneralpermit.

3.Waivers.AfterMarch10,2003,siteswhoselargercommonplanofdevelopmentorsale haveatleastone,butlessthanfiveacresoflanddisturbance,whichwouldotherwise requirepermitcoverageforstormwaterdischargesassociatedwithconstruction activities,mayrequestthatthedirectorwaivetheirpermitrequirement.Entitieswishing torequestsuchawaivermustcertifyinwritingthattheconstructionactivitymeetsoneof thetwowaiverconditions:

a.RainfallErosivityWaiver.Foraconstructionsitetoqualifyfortherainfallerosivity waiver,thecumulativerainfallerosivityovertheprojectdurationmustbefiveorless andthesitemustbestabilizedwithaleasta70percentvegetativecoverorother permanent,non-erosivecover.Therainfallerosivitymustbecalculatedaccordingto themethodinU.S.EPAFactSheet3.1ConstructionRainfallErosivityWaiverdated January2001andbefoundat:https://epa.ohio.gov/divisions-andoffices/surface-water/permitting/stormwater-program.Ifitisdeterminedthata constructionactivitywilltakeplaceduringatimeperiodwheretherainfallerosivity factorislessthanfive,awrittenwaivercertificationmustbesubmittedtoOhioEPA atleast21daysbeforeconstructionactivityisscheduledtobegin.Iftheconstruction activitywillextendbeyondthedatesspecifiedinthewaivercertification,theoperator musteither:(a)recalculatethewaiverusingtheoriginalstartdatewiththenew endingdate(iftheRfactorisstilllessthanfive,anewwaivercertificationmustbe submitted)or(b)submitanNOIapplicationformandfeeforcoverageunderthis generalpermitatleastsevendayspriortotheendofthewaiverperiod;or

b.TMDL(TotalMaximumDailyLoad)Waiver.Stormwatercontrolsarenotneeded basedonaTMDLapprovedorestablishedbyU.S.EPAthataddressesthe pollutant(s)ofconcernor,fornon-impairedwatersthatdonotrequireTMDLs,and equivalentanalysisthatdeterminesallocationsforsmallconstructionsitesforthe pollutant(s)ofconcernorthatdeterminesthatsuchallocationsarenotneededto protectwaterqualitybasedonconsiderationofexistingin-streamconcentrations, expectedgrowthinpollutantcontributionsfromallsources,andamarginofsafety. Thepollutant(s)ofconcernincludesedimentoraparameterthataddresses sediment(suchastotalsuspendedsolids,turbidityorsiltation)andanyother pollutantthathasbeenidentifiedasacauseofimpairmentofanywaterbodythatwill receiveadischargefromtheconstructionactivity.Theoperatormustcertifytothe directorofOhioEPAthattheconstructionactivitywilltakeplace,andstormwater dischargeswilloccur,withinthedrainageareaaddressedbytheTMDLorequivalent analysis.AwrittenwaivercertificationmustbesubmittedtoOhioEPAatleast21 daysbeforetheconstructionactivityisscheduledtobegin.

4.Prohibitiononnon-stormwaterdischarges.Alldischargescoveredbythispermitmust becomposedentirelyofstormwaterwiththeexceptionofthefollowing:dischargesfrom firefightingactivities;firehydrantflushings;potablewatersourcesincludingwaterline flushings;irrigationdrainage;lawnwatering;routineexternalbuildingwashdownwhich doesnotusedetergents;pavementwashwaterswherespillsorleaksoftoxicor hazardousmaterialshavenotoccurred(unlessallspilledmaterialhasbeenremoved) andwheredetergentsarenotused;airconditioningcondensate;springs; uncontaminatedgroundwaterfromtrenchorwellpointdewateringandfoundationor footingdrainswhereflowsarenotcontaminatedwithprocessmaterialssuchas solvents.DewateringactivitiesmustbedoneincompliancewithPartII.CandPart III.G.2.g.ivofthispermit.Dischargesofmaterialotherthanstormwaterortheauthorized non-stormwaterdischargeslistedabovemustcomplywithanindividualNPDESpermit oranalternativeNPDESgeneralpermitissuedforthedischarge.

Exceptforflowsfromfirefightingactivities,sourcesofnon-stormwaterlistedabovethat arecombinedwithstormwaterdischargesassociatedwithconstructionactivitymustbe identifiedintheSWP3.TheSWP3mustidentifyandensuretheimplementationof appropriatepollutionpreventionmeasuresforthenon-stormwatercomponent(s)ofthe discharge.

5.Spillsandunintendedreleases(ReleasesinexcessofReportableQuantities).This permitdoesnotrelievethepermitteeofthereportingrequirementsofTitle40ofthe theeventofa spillorotherunintendedrelease,thedischargeofhazardoussubstancesinthestorm waterdischarge(s)fromaconstructionsitemustbeminimizedinaccordancewiththe applicablestormwaterpollutionpreventionplanfortheconstructionactivityandinno case,duringany24-hourperiod,maythedischarge(s)containahazardoussubstance equaltoorinexcessofreportablequantities.

40CFRPart117setsforthadeterminationofthereportablequantityforeachsubstance designatedashazardousin40CFRPart116.Theregulationappliestoquantitiesof designatedsubstancesequaltoorgreaterthanthereportablequantities,when dischargedtosurfacewatersofthestate.40CFRPart302designatesundersection 102(a)oftheComprehensiveEnvironmentalResponse,CompensationandLiabilityAct of1980,thosesubstancesinthestatutesreferredtoinsection101(14),identifies reportablequantitiesforthesesubstancesandsetsforththenotificationrequirementsfor releasesofthesesubstances.Thisregulationalsosetsforthreportablequantitiesfor hazardoussubstancesdesignatedundersection311(b)(2)(A)oftheCleanWaterAct (CWA).

C.RequiringanindividualNPDESpermitoranalternativeNPDESgeneralpermit.

1.Thedirectormayrequireanalternativepermit.Thedirectormayrequireanyoperator eligibleforthispermittoapplyforandobtaineitheranindividualNPDESpermitor coverageunderanalternativeNPDESgeneralpermitinaccordancewithOACRule 3745-38-02.Anyinterestedpersonmaypetitionthedirectortotakeactionunderthis paragraph.

ThedirectorwillsendwrittennotificationthatanalternativeNPDESpermitisrequired. Thisnoticeshallincludeabriefstatementofthereasonsforthisdecision,anapplication

formandastatementsettingadeadlinefortheoperatortofiletheapplication.Ifan operatorfailstosubmitanapplicationinatimelymannerasrequiredbythedirector underthisparagraph,thencoverage,ifineffect,underthispermitisautomatically terminatedattheendofthedayspecifiedforapplicationsubmittal.

2.OperatorsmayrequestanindividualNPDESpermit.Anyowneroroperatoreligiblefor thispermitmayrequesttobeexcludedfromthecoverageofthispermitbyapplyingfor anindividualpermit.Theowneroroperatorshallsubmitanindividualapplicationwith reasonssupportingtherequesttothedirectorinaccordancewiththerequirementsof40 CFR122.26.Ifthereasonsadequatelysupporttherequest,thedirectorshallgrantitby issuinganindividualNPDESpermit.

3.WhenanindividualNPDESpermitisissuedtoanowneroroperatorotherwisesubjectto thispermitortheowneroroperatorisapprovedforcoverageunderanalternative NPDESgeneralpermit,theapplicabilityofthispermittotheindividualNPDESpermittee isautomaticallyterminatedontheeffectivedateoftheindividualpermitorthedateof approvalforcoverageunderthealternativegeneralpermit,whicheverthecasemaybe.

D.Permitrequirementswhenportionsofasitearesold

Ifanoperatorobtainsapermitforadevelopment,andthentheoperator(permittee)sellsofflots orparcelswithinthatdevelopment,permitcoveragemustbecontinuedonthoselotsuntila NoticeofTermination(NOT)inaccordancewithPartIV.Bissubmitted.Fordevelopments whichrequiretheuseofcentralizedsedimentanderosioncontrols(i.e.,controlsthataddress stormwaterrunofffromoneormorelots)forwhichthecurrentpermitteeintendstoterminate responsibilitiesunderthispermitforalotaftersaleofthelottoanewownerandsuch terminationwilleitherpreventorimpairtheimplementationofthecontrolsandtherefore jeopardizecompliancewiththetermsandconditionsofthispermit,thepermitteewillbe requiredtomaintainresponsibilityfortheimplementationofthosecontrols.Fordevelopments toindividuallotownersunlessanexceptionisapprovedinaccordancewithPartIII.G.4.In caseswherepermitresponsibilitiesforindividuallot(s)willbeterminatedaftersaleofthelot,the permitteeshallinformtheindividuallotowneroftheobligationsunderthispermitandensure thattheIndividualLotNOIapplicationissubmittedtoOhioEPA.

E.Authorization

1.Obtainingauthorizationtodischarge.Operatorsthatdischargestormwaterassociated withconstructionactivitymustsubmitanNOIapplicationformandStormwaterPollution PreventionPlan(SWP3)iflocatedwithintheBigDarbyCreekwatershedorportionsof theOlentangywatershedinaccordancewiththerequirementsofPartI.Fofthispermitto obtainauthorizationtodischargeunderthisgeneralpermit.AsrequiredunderOAC Rule3745-38-02(E),thedirector,inresponsetotheNOIsubmission,willnotifythe applicantinwritingthathe/shehasorhasnotbeengrantedgeneralpermitcoverageto dischargestormwaterassociatedwithconstructionactivityunderthetermsand conditionsofthispermitorthattheapplicantmustapplyforanindividualNPDESpermit orcoverageunderanalternategeneralNPDESpermitasdescribedinPartI.C.1.

2.Noreleasefromotherrequirements.Noconditionofthispermitshallreleasethe permitteefromanyresponsibilityorrequirementsunderotherenvironmentalstatutesor

regulations.Otherpermitrequirementscommonlyassociatedwithconstructionactivities include,butarenotlimitedto,section401waterqualitycertifications,isolatedwetland permits,permitstoinstallsanitarysewersorotherdevicesthatdischargeorconvey pollutedwater,permitstoinstalldrinkingwaterlines,singlelotsanitarysystempermits anddisturbanceoflandwhichwasusedtooperateasolidorhazardouswastefacility (i.e.,coverageunderthisNPDESgeneralpermitdoesnotsatisfytherequirementsof OACRule3745-27-13orORCSection3734.02(H)).Theissuanceofthispermitis subjecttoresolutionofanantidegradationreview.Thispermitdoesnotrelievethe permitteeofotherresponsibilitiesassociatedwithconstructionactivitiessuchas contactingtheOhioDepartmentofNaturalResources,DivisionofWater,toensure properwellinstallationandabandonmentofwells.

F.NoticeofIntentRequirements

1.Deadlinesfornotification.

a.Initialcoverage:Operatorswhointendtoobtaininitialcoverageforastormwater dischargeassociatedwithconstructionactivityunderthisgeneralpermitmustsubmit acompleteandaccurateNOIapplicationform,acompletedStormwaterPollution PreventionPlan(SWP3)forprojectswithintheBigDarbyCreekandportionsofthe Olentangyriverwatershedsandappropriatefeeatleast21days(or45daysinthe BigDarbyCreekwatershedandportionsoftheOlentangywatershed)priortothe commencementofconstructionactivity.Ifmorethanoneoperator,asdefinedin PartVIIofthisgeneralpermit,willbeengagedatasite,eachoperatorshallseek coverageunderthisgeneralpermitpriortoengaginginconstructionactivities. Coverageunderthispermitisnoteffectiveuntilanapprovallettergrantingcoverage fromthedirectorofOhioEPAisreceivedbytheapplicant.Whereoneoperatorhas alreadysubmittedanNOIpriortootheroperator(s)beingidentified,theadditional operatorshallrequestmodificationofcoveragetobecomeaco-permittee.Insuch instances,theco-permitteesshallbecoveredunderthesamefacilitypermitnumber. Noadditionalpermitfeeisrequired.

b.Individuallottransferofcoverage:Operatorsmusteachsubmitanindividuallot noticeofintent(IndividualLotNOI)applicationform(nofeerequired)toOhioEPAat leastsevendayspriortothedatethattheyintendtoacceptresponsibilityforpermit requirementsfortheirportionoftheoriginalpermitteddevelopmentfromtheprevious permittee.Transferofpermitcoverageisnotgranteduntilanapprovalletterfromthe directorofOhioEPAisreceivedbytheapplicant.

2.Failuretonotify.Operatorswhofailtonotifythedirectoroftheirintenttobecoveredand whodischargepollutantstosurfacewatersofthestatewithoutanNPDESpermitarein violationofORCChapter6111.Insuchinstances,OhioEPAmaybringanenforcement actionforanydischargesofstormwaterassociatedwithconstructionactivity.

3.HowtosubmitanNOI.Operatorsseekingcoverageunderthispermitmustsubmita applicationformwhichisavailablethroughtheOhioEPAeBusinessCenterat: https://ebiz.epa.ohio.gov/.SubmissionthroughtheOhioEPAeBusinessCenterwill requireestablishinganOhioEPAeBusinessCenteraccountandobtainingaunique PersonalIdentificationNumber(PIN)forfinalsubmissionoftheNOI.ExistingeBusiness

CenteraccountholderscanaccesstheNOIformthroughtheirexistingaccountand submitusingtheirexistingPIN.Pleaseseethefollowinglinkforguidance: https://epa.ohio.gov/divisions-and-offices/surface-water/permitting/electronicbusiness-services-sub/streams.Alternatively,ifyouareunabletoaccesstheNOI formthroughtheagencyeBusinessCenterduetoademonstratedhardship,theNOI maybesubmittedonapaperNOIformprovidedbyOhioEPA.NOIinformationshallbe typedontheform.PleasecontactOhioEPA,DivisionofSurfaceWaterat(614)6442001ifyouwishtoreceiveapaperNOIform.

4.Additionalnotification.NOIsandSWP3sareconsideredpublicdocumentsandshallbe madeavailabletothepublicinaccordancewithPartIII.C.2.Thepermitteeshallmake NOIsandSWP3savailableuponrequestofthedirectorofOhioEPA,localagencies approvingsedimentanderosioncontrolplans,gradingplansorstormwatermanagement plans,localgovernmentalofficials,oroperatorsofmunicipalseparatestormsewer systems(MS4s)receivingdrainagefromthepermittedsite.Eachoperatorthat dischargestoanNPDESpermittedMS4shallprovideacopyofitsOhioEPANOI submissiontotheMS4inaccordancewiththeMS4requirements,ifapplicable.

5.Re-notification.Existingpermitteeshavingcoverageunderthepreviousgenerationof thisgeneralpermitshallhavecontinuingcoverageunderOHC000006withthesubmittal ofatimelyrenewalapplication.Within180daysfromtheeffectivedateofthispermit, existingpermitteesshallsubmitthecompletedrenewalapplicationexpressingtheir intentforcontinuedcoverage.InaccordancewithOhioAdministrativeCode(OAC) 3745-38-02(E)(2)(a)(ii),arenewalapplicationfeewillnotapplytoexistingpermittees havinggeneralpermitcoverageissuedonorafterApril22,2022.Permitcoveragewill beterminatedifOhioEPAdoesnotreceivetherenewalapplicationwithinthis180-day period.

PartII.NON-NUMERICEFFLUENTLIMITATIONS

Youshallcomplywiththefollowingnon-numericeffluentlimitationsfordischargesfromyoursite and/orfromconstructionsupportactivities.PartIIIofthispermitcontainsthespecificdesign criteriatomeettheobjectivesofthefollowingnon-numericeffluentlimitations.Youshall developandimplementtheSWP3inaccordancewithPartIIIofthispermittosatisfythesenonnumericeffluentlimitations.

A.ErosionandSedimentControls.Youshalldesign,installandmaintaineffective erosioncontrolsandsedimentcontrolstominimizethedischargeofpollutants.Ata minimum,suchcontrolsshallbedesigned,installedandmaintainedto:

1.Controlstormwatervolumeandvelocitywithinthesitetominimizesoilandstream erosion;

2.Controlstormwaterdischarges,includingbothpeakflowratesandtotalstormwater volume,tominimizeerosionatoutletsandtominimizedownstreamchanneland streambankerosion;

3.Minimizetheamountofsoilexposedduringconstructionactivity;

4.Minimizethedisturbanceofsteepslopes;

5.Minimizesedimentdischargesfromthesite.Thedesign,installationandmaintenance oferosionandsedimentcontrolsshalladdressfactorssuchastheamount,frequency, intensityanddurationofprecipitation,thenatureofresultingstormwaterrunoff,andsoil characteristics,includingtherangeofsoilparticlesizesexpectedtobepresentonthe site;

6.Iffeasible,provideandmaintaina50-footundisturbednaturalbufferaroundsurface watersofthestate,directstormwatertovegetatedareastoincreasesedimentremoval andmaximizestormwaterinfiltration.Ifitisinfeasibletoprovideandmaintainan undisturbed50-footnaturalbuffer,youshallcomplywiththestabilizationrequirements foundinPartII.Bforareaswithin50feetofasurfacewater;and

7.Minimizesoilcompactionand,unlessinfeasible,preservetopsoil.

B.SoilStabilization.Stabilizationofdisturbedareasshall,ataminimum,beinitiatedin accordancewiththetimeframesspecifiedinthefollowingtables.

Table1:PermanentStabilization

ArearequiringpermanentstabilizationTimeframetoapplyerosioncontrols

Anyareasthatwillliedormantforoneyearor more

Anyareaswithin50feetofasurfacewaterof thestateandatfinalgrade

Otherareasatfinalgrade

Withinsevendaysofthemostrecent disturbance

Withintwodaysofreachingfinalgrade

Withinsevendaysofreachingfinalgrade withinthatarea

Table2:TemporaryStabilization

ArearequiringtemporarystabilizationTimeframetoapplyerosioncontrols

Anydisturbedareaswithin50feetofa surfacewaterofthestateandnotatfinal grade

Anydisturbedareasthatwillbedormantfor morethan14daysbutlessthanoneyear, andnotwithin50feetofasurfacewaterof thestate

Withintwodaysofthemostrecent disturbanceiftheareawillremainidlefor morethan14days

Withinsevendaysofthemostrecent disturbancewithinthearea

Forresidentialsubdivisions,disturbedareas mustbestabilizedatleastsevendayspriorto transferofpermitcoveragefortheindividual lot(s).

DisturbedareasthatwillbeidleoverwinterPriortotheonsetofwinterweather Wherevegetativestabilizationtechniquesmaycausestructuralinstabilityorare otherwiseunobtainable,alternativestabilizationtechniquesmustbeemployed. PermanentandtemporarystabilizationaredefinedinPartVII.

C.Dewatering.Dischargesfromdewateringactivities,includingdischargesfrom dewateringoftrenchesandexcavations,areprohibitedunlessmanagedbyappropriate controls.

D.PollutionPreventionMeasures.Design,install,implementandmaintaineffective pollutionpreventionmeasurestominimizethedischargeofpollutants.Ataminimum, suchmeasuresmustbedesigned,installed,implementedandmaintainedto:

1.Minimizethedischargeofpollutantsfromequipmentandvehiclewashing,wheel washwater,andotherwashwaters.Washwatersshallbetreatedinasedimentbasinor alternativecontrolthatprovidesequivalentorbettertreatmentpriortodischarge;

2.Minimizetheexposureofconstructionmaterials,products,andwastes;landscape materials,fertilizers,pesticides,andherbicides;detergents,sanitarywasteandother materialspresentonthesitetoprecipitationandtostormwater;and

3.Minimizethedischargeofpollutantsfromspillsandleaksandimplementchemicalspill andleakpreventionandresponseprocedures.

E.ProhibitedDischarges.Thefollowingdischargesareprohibited:

1.Wastewaterfromwashoutofconcrete,unlessmanagedbyanappropriatecontrol;

2.Wastewaterfromwashoutandcleanoutofstucco,paint,formreleaseoils,curing compoundsandotherconstructionmaterials;

3.Fuels,oils,orotherpollutantsusedinvehicleandequipmentoperationand maintenance;and

4.Soapsorsolventsusedinvehicleandequipmentwashingorallotherwastewater streamswhichcouldbesubjecttoanindividualNPDESpermit(PartIII.G.2.g).

F.SurfaceOutlets.Whendischargingfromsedimentbasinsutilizeoutletstructuresthat withdrawwaterfromthesurface,unlessinfeasible.(Note:OhioEPAbelievesthatthe circumstancesinwhichitisinfeasibletodesignoutletstructuresinthismannerarerare. Exceptionsmayincludetimeperiodswithextendedcoldweatherduringwintermonths. Ifyouhavedeterminedthatitisinfeasibletomeetthisrequirement,youshallprovide documentationinyourSWP3tosupportyourdetermination.)

G.Post-ConstructionStormwaterManagementControls. physical,chemicalandbiologicalcharacteristicsareprotected,andstreamfunctionsare maintained,post-constructionstormwaterpracticesshallprovidelong-termmanagement ofrunoffqualityandquantity.

PARTIII.STORMWATERPOLLUTIONPREVENTIONPLAN(SWP3)

A.StormwaterPollutionPreventionPlans.

ASWP3shallbedevelopedforeachsitecoveredbythispermit.Foramulti-phaseconstruction project,aseparateNOIshallbesubmittedwhenaseparateSWP3willbepreparedfor subsequentphases.SWP3sshallbepreparedinaccordancewithsoundengineeringand/or conservationpracticesbyaprofessionalexperiencedinthedesignandimplementationof standarderosionandsedimentcontrolsandstormwatermanagementpracticesaddressingall phasesofconstruction.TheSWP3shallclearlyidentifyallactivitieswhicharerequiredtobe

authorizedunderSection401andsubjecttoanantidegradationreview.TheSWP3shallidentify potentialsourcesofpollutionwhichmayreasonablybeexpectedtoaffectthequalityof stormwaterdischargesassociatedwithconstructionactivities.TheSWP3shallbea comprehensive,stand-alonedocument,whichisnotcompleteunlessitcontainstheinformation requiredbyPartIII.Gofthispermit.Inaddition,theSWP3shalldescribeandensurethe implementationofbestmanagementpractices(BMPs)thatreducethepollutantsandimpactof stormwaterdischargesduringconstructionandpollutantsassociatedwiththepost-construction landusetoensurecompliancewithORCSection6111.04,OACChapter3745-1andtheterms andconditionsofthispermit.

B.Timing.

AnacceptableSWP3shallbecompletedandsubmittedtotheapplicableregulatedMS4 entity(forprojectsconstructedentirelywithinaregulatedMS4area)priortothetimely submittalofanNOI.ProjectswithintheBigDarbyCreekandportionsoftheOlentangy watershedsmustsubmitaSWP3withtheNOI.TheSWP3shallbeupdatedinaccordance withPartIII.D.SubmissionofaSWP3doesnotconstitutereviewandapprovalonthepartof OhioEPA.Uponrequestandgoodcauseshown,thedirectormaywaivetherequirementto haveaSWP3completedatthetimeofNOIsubmission.Ifawaiverhasbeengranted,the SWP3mustbecompletedpriortotheinitiationofconstructionactivities.TheSWP3mustbe implementeduponinitiationofconstructionactivities.

Inordertocontinuecoveragefromthepreviousgenerationsofthispermit,thepermitteeshall reviewandupdatethe daysaftertheeffectivedateofthispermit.Ifitisinfeasibleforyoutocomplywithaspecific requirementinthispermitbecause(1)theprovisionwasnotpartofthepermityouwere previouslycoveredunder,and(2)becauseyouarepreventedfromcomplianceduetothe natureorlocationofearthdisturbancesthatcommencedpriortotheeffectivedateofthis permit,youshallincludedocumentationwithinyourSWP3ofthereasonswhyitisinfeasiblefor youtomeetthespecificrequirement.

ExamplesofOHC000006permitconditionsthatwouldbeinfeasibleforpermitteesrenewing coveragetocomplywithinclude:

OHC000006post-constructionrequirements,forprojectsthatobtainedNPDES constructionstormwatercoverageandstartedconstructionactivitiespriortotheeffective dateofthispermit;

OHC000006post-constructionrequirements,formulti-phasedevelopmentprojectswithan existingregionalpost-constructionBMPissuedunderpreviousNPDESpost-construction requirements

ConstructionStormwaterPermitsissuedafterApril20,2003;or

Case-by-casesituationsapprovedbytheDirector.

C.SWP3SignatureandReview.

1.PlanSignatureandRetentionOn-Site.TheSWP3shallincludethecertificationinPart V.H,besignedinaccordancewithPartV.G.,andberetainedonsiteduringworking hours.

2.PlanAvailability

a.On-site:Theplanshallbemadeavailableimmediatelyuponrequestofthedirector orhisauthorizedrepresentativeandMS4operatorsortheirauthorized representativeduringworkinghours.AcopyoftheNOIandlettergrantingpermit coverageunderthisgeneralpermitalsoshallbemadeavailableatthesite.TheNOI andlettergrantingpermitcoveragemaybemaintainedelectronicallyunderthe conditionthattheycanbeimmediatelyproducedon-siteuponrequest.TheSWP3 maybeprepared,signed,andkeptelectronically,ratherthaninpaperform,ifthe recordsare:(a)inaformatthatcanbereadinasimilarmannerasapaperrecord; (b)legallydependablewithnolessevidentiaryvaluethantheirpaperequivalent;and (c)immediatelyaccessibletotheinspectorduringaninspectiontothesameextent asapapercopystoredatthesitewouldbe,iftherecordswerestoredinpaperform. Foradditionalguidanceontheproperpracticestofollowfortheelectronicretention

https://epa.ohio.gov/divisions-and-offices/surface-water/permitting/storm-waterdischarges-from-small-and-large-construction-activities--general-permit

b.Bywrittenrequest:ThepermitteemustprovidethemostrecentcopyoftheSWP3 within7daysuponwrittenrequestbyanyofthefollowing:

i.

ii.Alocalagencyapprovingsedimentanderosionplans,gradingplansor stormwatermanagementplans;or

iii.Inthecaseofastormwaterdischargeassociatedwithconstructionactivitywhich dischargesthroughamunicipalseparatestormsewersystemwithanNPDES permit,totheoperatorofthesystem.

c.Tothepublic:AllNOIs,generalpermitapprovalforcoverageletters,andSWP3s areconsideredreportsthatshallbeavailabletothepublicinaccordancewiththe OhioPublicRecordslaw.Thepermitteeshallmakedocumentsavailabletothe publicuponrequestorprovideacopyatpublicexpense,atcost,inatimelymanner. However,thepermitteemayclaimtoOhioEPAanyportionofanSWP3as confidentialinaccordancewithOhiolaw.

3.PlanRevision.Thedirectororauthorizedrepresentativemaynotifythepermitteeatany timethattheSWP3doesnotmeetoneormoreoftheminimumrequirementsofthis part.Within10daysaftersuchnotificationfromthedirectororauthorizedrepresentative (orasotherwiseprovidedinthenotification),thepermitteeshallmaketherequired changestotheSWP3andshallsubmittoOhioEPAtherevisedSWP3orawritten certificationthattherequestedchangeshavebeenmade.

D.Amendments.

ThepermitteeshallamendtheSWP3wheneverthereisachangeindesign,construction, operationormaintenance,whichhasasignificanteffectonthepotentialforthedischargeof pollutantstosurfacewatersofthestateoriftheSWP3provestobeineffectiveinachievingthe generalobjectivesofcontrollingpollutantsinstormwaterdischargesassociatedwith

constructionactivity.AmendmentstotheSWP3maybereviewedbyOhioEPAinthesame mannerasPartIII.C.

E.Dutytoinformcontractorsandsubcontractors.

Thepermitteeshallinformallcontractorsandsubcontractorsnototherwisedefinedas SWP3ofthetermsandconditionsofthisgeneralpermit.Thepermitteeshallmaintainawritten documentcontainingthesignaturesofallcontractorsandsubcontractorsinvolvedinthe implementationoftheSWP3asproofacknowledgingthattheyreviewedandunderstandthe conditionsandresponsibilitiesoftheSWP3.Forcontactorsandsubcontractorswhichdonot meetthedefinitionofanoperator,thewrittendocumentshallbecreatedandsignaturesshallbe obtainedpriortocommencementofeachcontractors/subcontractorswork.

F.TotalMaximumDailyLoad(TMDL)allocations.

specificBMPsforconstructionsites,thedirectormayrequirethepermitteetorevisehis/her SWP3.SpecificconditionshavebeenprovidedinAppendixA(fortheBigDarbyCreek Watershed)andAppendixB(forportionsoftheOlentangyriverwatershed).

G.SWP3Requirements.

Operationsthatdischargestormwaterfromconstructionactivitiesaresubjecttothefollowing requirementsandtheSWP3shallincludethefollowingitems:

1.Sitedescription.EachSWP3shallprovide:

a.Adescriptionofthenatureandtypeoftheconstructionactivity(e.g.,lowdensity residential,shoppingmall,highway,etc.);

b.Totalareaofthesiteandtheareaofthesitethatisexpectedtobedisturbed (i.e.,grubbing,clearing,excavation,fillingorgrading,includingoff-siteborrow areas);

c.Ameasureoftheimperviousareaandpercentimperviousnesscreatedbythe constructionactivity(existing,newandtotalimperviousareaafterconstruction);

d.Stormwatercalculations,includingthevolumetricrunoffcoefficientsforboththe pre-constructionandpost-constructionsiteconditions,andresultingwater qualityvolume;designdetailsforpost-constructionstormwaterfacilitiesand pretreatmentpracticessuchascontributingdrainageareas,capacities, elevations,outletdetailsanddraintimesshallbeincludedintheSWP3;andif applicable,explanationoftheuseofexistingpost-constructionfacilities.Ohio DevelopmentmanualandOhioEPAresourcesforexamples);

e.Existingdatadescribingthesoiland,ifavailable,thequalityofanydischarge fromthesite;

f.Adescriptionofpriorlandusesatthesite;

g.Adescriptionoftheconditionofanyon-sitestreams(e.g.priorchannelization, bedinstabilityorheadcuts,channelsonpublicmaintenance,ornatural channels);

h.ABMPimplementationschedulewhichdescribesthesequenceofmajor constructionoperations(i.e.,designationofvegetativepreservationareas, grubbing,excavating,grading,utilities,infrastructureinstallationandothers)and theimplementationoferosion,sedimentandstormwatermanagementpractices orfacilitiestobeemployedduringeachoperationofthesequence;

i.Thenameand/orlocationoftheimmediatereceivingstreamorsurfacewater(s) andthefirstsubsequentnamedreceivingwater(s)andthearealextentand descriptionofwetlandsorotherspecialaquaticsitesatornearthesitewhichwill bedisturbed,orwhichwillreceivedischargesfromdisturbedareasoftheproject. FordischargestoanMS4,thepointofdischargetotheMS4andthelocation wheretheMS4ultimatelydischargestoastreamorsurfacewaterofthestate shallbeindicated;

j.Forsubdivideddevelopments,adetaildrawingofindividualparcelswiththeir erosion,sedimentorstormwatercontrolpracticesand/oratypicalindividuallot showingstandardindividualloterosionandsedimentcontrolpractices.

Atypicalindividuallotdrawingdoesnotremovetheresponsibilitytodesignate specificerosionandsedimentcontrolpracticesintheSWP3forcriticalareas suchassteepslopes,streambanks,drainagewaysandriparianzones;

k.Locationanddescriptionofanystormwaterdischargesassociatedwithdedicated asphaltanddedicatedconcreteplantscoveredbythispermitandthebest managementpracticestoaddresspollutantsinthesestormwaterdischarges;

l.Acoverpageortitleidentifyingthenameandlocationofthesite,thenameand contactinformationofallconstructionsiteoperators,thenameandcontact informationforthepersonresponsibleforauthorizingandamendingtheSWP3, preparationdate,andtheestimateddatesthatconstructionwillstartandbe complete;

m.Alogdocumentinggradingandstabilizationactivitiesaswellasamendmentsto theSWP3,whichoccurafterconstructionactivitiescommence;and

n.Sitemapshowing:

i.Limitsofearth-disturbingactivityofthesiteincludingassociatedoff-site borroworspoilareasthatarenotaddressedbyaseparateNOIand associatedSWP3;

ii.Soilstypesforallareasofthesite,includinglocationsofunstableor highlyerodibleand/orknowncontaminatedsoils;

iii.Existingandproposedcontours.Adelineationofdrainagewatersheds expectedduringandaftermajorgradingactivitiesaswellasthesizeof eachdrainagewatershed,inacres;

iv.Thelocationofanydelineatedboundaryforrequiredripariansetbacks;

v.Conservationeasementsorareasdesignatedasopenspace,preserved vegetationorotherwiseprotectedfromearthdisturbingactivities.A descriptionofanyassociatedtemporaryorpermanentfencingorsignage;

vi.Surfacewaterlocationsincludingsprings,wetlands,streams,lakes,water wells,etc.,onorwithin200feetofthesite,includingtheboundariesof wetlandsorstreamchannelsandfirstsubsequentnamedreceiving water(s)thepermitteeintendstofillorrelocateforwhichthepermitteeis seekingapprovalfromtheArmyCorpsofEngineersand/orOhioEPA;

vii.Existingandplannedlocationsofbuildings,roads,parkingfacilitiesand utilities;

viii.Thelocationofallerosionandsedimentcontrolpractices,includingthe locationofareaslikelytorequiretemporarystabilizationduringsite development;

ix.Sedimenttrapsandbasinsnotingtheirsedimentstorageanddewatering (detention)volumeandcontributingdrainagearea.OhioEPA recommendstheuseofdatasheets(seeRainwaterand LandDevelopmentmanualandwebsiteforexamples)toprovidedatafor allsedimenttrapsandbasinsnotingimportantinputstodesignand resultingparameterssuchastheircontributingdrainagearea,disturbed area,detentionvolume,sedimentstoragevolume,practicesurfacearea, dewateringtime,outlettypeanddimensions;

x.Thelocationofpermanentstormwatermanagementpractices(newand existing)includingpretreatmentpracticestobeusedtocontrolpollutants instormwaterafterconstructionoperationshavebeencompletedalong withthelocationofexistingandplanneddrainagefeaturesincludingcatch basins,culverts,ditches,swales,surfaceinletsandoutletstructures;

xi.Areasdesignatedforthestorageordisposalofsolid,sanitaryandtoxic wastes,includingdumpsterareas,areasdesignatedforcementtruck washout,andvehiclefueling;

xii.Thelocationofdesignatedconstructionentranceswherethevehicleswill accesstheconstructionsite;and

xiii.Thelocationofanyareasofproposedfloodplainfill,floodplain excavation,streamrestorationorknowntemporaryorpermanentstream crossings.

2.Controls.InaccordancewithPartII.A,theSWP3shallcontainadescriptionofthe controlsappropriateforeachconstructionoperationcoveredbythispermitandthe operator(s)shallimplementsuchcontrols.TheSWP3shallclearlydescribeforeach majorconstructionactivityidentifiedinPartIII.G.1.h:(a)appropriatecontrolmeasures andthegeneraltiming(orsequence)duringtheconstructionprocessthatthemeasures willbeimplemented;and(b)whichcontractorisresponsibleforimplementation(e.g., contractorAwillclearlandandinstallperimetercontrolsandcontractorBwillmaintain perimetercontrolsuntilfinalstabilization).TheSWP3shallidentifythesubcontractors engagedinactivitiesthatcouldimpactstormwaterrunoff.TheSWP3shallcontain signaturesfromalloftheidentifiedsubcontractorsindicatingthattheyhavebeen informedandunderstandtheirrolesandresponsibilitiesincomplyingwiththeSWP3. OhioEPArecommendsthattheprimarysiteoperatorreviewtheSWP3withtheprimary contractorpriortocommencementofconstructionactivitiesandkeepaSWP3training logtodemonstratethatthisreviewhasoccurred.

OhioEPArecommendsthattheerosion,sediment,andstormwatermanagement practicesusedtosatisfytheconditionsofthispermitshouldmeetthestandardsand RainwaterandLandDevelopment (seedefinitions)manualorotherstandardsacceptabletoOhioEPA.Thecontrolsshall includethefollowingminimumcomponents:

a.PreservationMethods.TheSWP3shallmakeuseofpracticeswhichpreserve theexistingnaturalconditionasmuchasfeasible.Suchpracticesmayinclude: preservingexistingvegetation,vegetativebufferstrips,andexistingsoilprofile andtopsoil;phasingofconstructionoperationstominimizetheamountof disturbedlandatanyonetime;anddesignationoftreepreservationareasor otherprotectiveclearingorgrubbingpractices.Forallconstructionactivities immediatelyadjacenttosurfacewatersofthestate,thepermitteeshallcomply withthebuffernon-numericeffluentlimitationinPartII.A.6,asmeasuredfromthe ordinaryhighwatermarkofthesurfacewater.OhioEPAstronglyrecommends that50-footbuffersbemaintainedaroundsurfacewaters,includingwetlands.

b.ErosionControlPractices.TheSWP3shallmakeuseoferosioncontrolsthat providecoveroverdisturbedsoilsunlessanexceptionisapprovedinaccordance withPartIII.G.4.Adescriptionofcontrolpracticesdesignedtore-establish vegetationorsuitablecoverondisturbedareasaftergradingshallbeincludedin theSWP3.TheSWP3shallprovidespecificationsforstabilizationofall disturbedareasofthesiteandprovideguidanceastowhichmethodof stabilizationwillbeemployedforanytimeoftheyear.Suchpracticesmay include:temporaryseeding,permanentseeding,mulching,matting,sod stabilization,vegetativebufferstrips,phasingofconstructionoperations,useof constructionentrancesandtheuseofalternativegroundcover.

i.Stabilization.Disturbedareasshallbestabilizedinaccordancewith Table1(PermanentStabilization)andTable2(TemporaryStabilization) inPartII.Bofthispermit.

ii.Permanentstabilizationofconveyancechannels.Operatorsshall undertakespecialmeasurestostabilizechannelsandoutfallsand preventerosiveflows.Measuresmayincludeseeding,dormantseeding

(asdefinedinthemostcurrenteditionoftheRainwaterandLand Developmentmanual),mulching,erosioncontrolmatting,sodding,riprap, naturalchanneldesignwithbioengineeringtechniquesorrockcheck dams.

c.RunoffControlPractices.TheSWP3shallincorporatemeasureswhichcontrol theflowofrunofffromdisturbedareassoastopreventerosionfromoccurring. Suchpracticesmayincluderockcheckdams,pipeslopedrains,diversionsto directflowawayfromexposedsoilsandprotectivegradingpractices.These practicesshalldivertrunoffawayfromdisturbedareasandsteepslopeswhere practicable.Velocitydissipationdevicesshallbeplacedatdischargelocations andalongthelengthofanyoutfallchanneltoprovidenon-erosiveflowvelocity fromthestructuretoawatercoursesothatthenaturalphysicalandbiological characteristicsandfunctionsaremaintainedandprotected.

d.SedimentControlPractices.Theplanshallincludeadescriptionofstructural practicesthatshallstorerunoffallowingsedimentstosettleand/ordivertflows awayfromexposedsoilsorotherwiselimitrunofffromexposedareas.Structural practicesshallbeusedtocontrolerosionandtrapsedimentfromasite remainingdisturbedformorethan14days.Suchpracticesmayinclude,among others:sedimentsettlingponds,sedimentbarriers,earthdiversiondikesor channelswhichdirectrunofftoasedimentsettlingpondandstormdraininlet protection.Allsedimentcontrolpracticesmustbecapableofpondingrunoffin ordertobeconsideredfunctional.Earthdiversiondikesorchannelsaloneare notconsideredasedimentcontrolpracticeunlessthoseareusedinconjunction withasedimentsettlingpond.

TheSWP3shallcontaindetaildrawingsforallstructuralpractices.

i.Timing.Sedimentcontrolstructuresshallbefunctionalthroughoutthe courseofearthdisturbingactivity.Sedimentbasinsandperimeter sedimentbarriersshallbeimplementedpriortogradingandwithinseven daysfromthestartofgrubbing.Theyshallcontinuetofunctionuntilthe upslopedevelopmentareaisstabilizedwithpermanentcover.As constructionprogressesandthetopographyisaltered,appropriate controlsshallbeconstructed,orexistingcontrolsalteredtoaddressthe changingdrainagepatterns.

ii.Sedimentsettlingponds.Asedimentsettlingpondisrequiredforany oneofthefollowingconditions:

Concentratedorcollectedstormwaterrunoff(e.g.,stormseweror ditch);

Runofffromdrainageareas,whichexceedthedesigncapacityofsilt fenceorothersedimentbarriers;or

Runofffromdrainageareasthatexceedthedesigncapacityofinlet protection.

ThepermitteemayrequestapprovalfromOhioEPAtousealternative controlsifthepermitteecandemonstratethealternativecontrolsare equivalentineffectivenesstoasedimentsettlingpond.

InaccordancewithPartII.F,iffeasible,sedimentsettlingpondsshallbe dewateredatthepondsurfaceusingaskimmerorequivalentdevice. Thesedimentsettlingpondvolumeconsistsofbothadewateringzone andasedimentstoragezone.Thevolumeofthedewateringzoneshall beaminimumof1800cubicfeet(ft3)peracreofdrainage(67yd3/acre) withaminimum48-hourdraintime.Thevolumeofthesedimentstorage zoneshallbecalculatedbyoneofthefollowingmethods:

Method1:Thevolumeofthesedimentstoragezoneshallbe1000ft3per disturbedacrewithinthewatershedofthebasin.OR

Method2:Thevolumeofthesedimentstoragezoneshallbethevolume necessarytostorethesedimentascalculatedwithRUSLEorasimilar generallyacceptederosionpredictionmodel.

Accumulatedsedimentshallberemovedfromthesedimentstoragezone onceitexceeds50percentoftheminimumrequiredsedimentstorage designcapacityandpriortotheconversiontothepost-construction practiceunlesssuitablestorageisdemonstratedbaseduponover-design. Whendeterminingthetotalcontributingdrainagearea,off-siteareasand areaswhichremainundisturbedbyconstructionactivityshallbeincluded unlessrunofffromtheseareasisdivertedawayfromthesedimentsettling pondandisnotco-mingledwithsediment-ladenrunoff.Thedepthofthe dewateringzoneshallbelessthanorequaltofivefeet.Theconfiguration betweeninletsandtheoutletofthebasinshallprovideatleasttwounits oflengthforeachoneunitofwidth(2:1length:widthratio);however,a lengthtowidthratioof4:1isrecommended.Whendesigningsediment settlingponds,thepermitteeshallconsiderpublicsafety,especiallyasit relatestochildren,asadesignfactorforthesedimentbasinand alternativesedimentcontrolsshallbeusedwheresitelimitationswould precludeasafedesign.Combiningmultiplesedimentanderosioncontrol measuresinordertomaximizepollutantremovalisencouraged.

iii.SedimentBarriersandDiversions.Sheetflowrunofffromdenuded areasshallbeinterceptedbysedimentbarriersordivertedtoasediment pondtoprotectadjacentpropertiesandwaterresourcesfromsediment transportedviasheetflow.Whereintendedtoprovidesedimentcontrol, sedimentbarriersshallbeplacedonalevelcontourdownslopeofthe disturbedarea.Formostapplications,standardsiltfenceora12-inch diametertubularfiltermaybeusedasasedimentbarrier.The relationshipbetweenthemaximumdrainageareatosedimentbarrierfor aparticularsloperangeisshowninthefollowingtable:

Placingsedimentbarriersinaparallelseriesdoesnotextendthesizeof thedrainagearea.Stormwaterdiversionpracticesshallbeusedtokeep runoffawayfromdisturbedareasandsteepslopeswherepracticable. Diversionpractices,whichincludeswales,dikesorberms,mayreceive stormwaterrunofffromareasupto10acres.

iv.InletProtection.Othererosionandsedimentcontrolpracticesshall minimizesedimentladenwaterenteringactivestormdrainsystems.All inletsreceivingrunofffromdrainageareasofoneormoreacreswill requireasedimentsettlingpond.

v.SurfaceWatersoftheStateProtection.Ifconstructionactivitiesdisturb areasadjacenttosurfacewatersofthestate,structuralpracticesshallbe designedandimplementedonsitetoprotectalladjacentsurfacewaters ofthestatefromtheimpactsofsedimentrunoff.Nostructuralsediment controls(e.g.,theinstallationofsiltfenceorasedimentsettlingpond) shallbeusedinasurfacewaterofthestate.Forallconstructionactivities immediatelyadjacenttosurfacewatersofthestate,thepermitteeshall complywiththebuffernon-numericeffluentlimitationinPartII.A.6,as measuredfromtheordinaryhighwatermarkofthesurfacewater.Where impactswithinthisbufferareaareunavoidable,duetothenatureofthe construction(e.g.,streamcrossingsforroadsorutilities),theprojectshall bedesignedsuchthatthenumberofstreamcrossingsandthewidthof thedisturbancewithinthebufferareaareminimized.

vi.ModifyingControls.Ifperiodicinspectionsorotherinformation indicatesacontrolhasbeenusedinappropriatelyorincorrectly,the permitteeshallreplaceormodifythecontrolforsiteconditions.

e.Post-ConstructionStormwaterManagementRequirements.Sothatreceiving chemicalandbiologicalcharacteristicsareprotected,and streamfunctionsaremaintained,post-constructionstormwaterpracticesshall providelong-termmanagementofrunoffqualityandquantity.Tomeetthepostconstructionrequirementsofthispermit,theSWP3shallcontainadescriptionof thepost-constructionBMPsthatwillbeinstalledduringconstructionforthesite andtherationalefortheirselection.Therationaleshalladdresstheanticipated impactsonthechannelandfloodplainmorphology,hydrology,andwaterquality. Post-constructionBMPscannotbeinstalledwithinasurfacewaterofthestate (e.g.,wetlandorstream)unlessitisauthorizedbyaCWA401waterquality certification,CWA404permit,orOhioEPAnon-jurisdictionalwetland/stream programapproval.Note:localjurisdictionsmayhavemorestringentpostconstructionrequirements.

i.OperationandMaintenancePlans.Detaildrawingsandmaintenance plansshallbeprovidedforallpost-constructionBMPsintheSWP3. Maintenanceplansshallbeprovidedbythepermitteetothepostconstructionoperatorofthesite(includinghomeownerassociations)upon completionofconstructionactivities(priortoterminationofpermit coverage).Maintenanceplansshallensurethatpollutantscollectedwithin structuralpost-constructionpracticesaredisposedofinaccordancewith

local,state,andfederalregulations.Toensurethatstormwater managementsystemsfunctionasdesignedandconstructed,thepostconstructionoperationandmaintenanceplanshallbeastand-alone documentwhichcontains:

1)adesignatedentityforstormwaterinspectionandmaintenance responsibilities;

2)theroutineandnon-routinemaintenancetaskstobeundertaken;

3)ascheduleforinspectionandmaintenance;

4)anynecessarylegallybindingmaintenanceeasementsand agreements;

5)constructiondrawingsorexcerptsshowingtheplanview,profile anddetailsoftheoutlet(s);

6)amapshowingallaccessandmaintenanceeasements;and

7)fortable4a/4bpractices,providerelevantelevationsand associatedvolumesthatdictatewhenremovalofaccumulated sedimentsmustoccur.

Permitteesareresponsibleforassuringallpost-constructionpractices meetplanspecificationsandintendedpost-constructionconditionshave beenmet(e.g.,sedimentremovedfrom,andsedimentstoragerestored to,permanentpools,sedimentcontroloutletsremovedandreplacedwith permanentpost-constructiondischargestructures,andallslopesand drainagewayspermanentlystabilized),butarenotresponsibleunderthis permitforoperationandmaintenanceofpost-constructionpracticesonce coverageunderthispermitisterminated.

ii.PointSourceDischargers.Post-constructionstormwaterBMPsthat dischargepollutantsfrompointsourcesonceconstructioniscompleted mayinthemselvesneedauthorizationunderaseparateNPDESpermit (oneexampleisstormwaterdischargesfromregulatedindustrialsites).

iii.NoImperviousSurface.Constructionactivitiesthatdonotincludethe installationofanyimpervioussurface(e.g.,parklands),abandonedmine landreclamationactivitiesregulatedbytheOhioDepartmentofNatural Resources,streamandwetlandrestorationactivities,andwetland mitigationactivitiesarenotrequiredtocomplywiththeconditionsofPart III.G.2.eofthispermit.Linearconstructionprojects(e.g.,pipelineorutility lineinstallation)whichdonotresultintheinstallationofadditional impervioussurfacearenotrequiredtocomplywiththeconditionsofPart III.G.2.eofthispermit.However,linearconstructionprojectsshallbe designedtominimizethenumberofstreamcrossingsandthewidthof disturbance,andtoachievefinalstabilizationofthedisturbedareaas definedinPartVII.M.1.

iv.Post-ConstructionBMPs.Forallconstructionactivitiesthatwilldisturb twoormoreacresoflandorwilldisturblessthantwoacresthatarepart ofalargercommonplanofdevelopmentorsalewhichwilldisturbtwoor moreacresofland,thepostconstructionBMP(s)chosenshallbeableto managestormwaterrunoffforprotectionofstreamchannels,stream stability,andwaterquality.TheBMP(s)chosenmustbecompatiblewith

siteandsoilconditions.Structuralpost-constructionstormwater treatmentpracticesshallbeincorporatedintothepermanentdrainage systemforthesite.TheBMP(s)chosenmustbesizedtotreatthewater qualityvolume(WQv StandardsinOACChapter3745-1.TheWQvshallbeequivalenttothe volumeofrunofffroma0.90-inchrainfallandshallbedeterminedusing thefollowingequations:

WQv=Rv*P*A/12 (Equation1)

where:

WQv=waterqualityvolumeinacre-feet

Rv=thevolumetricrunoffcoefficientcalculatedusingequation2

P=0.90inchprecipitationdepth

A=areadrainingintotheBMPinacres

Rv=0.05+0.9i (Equation2)

wherei=fractionofpost-constructionimpervioussurface

OhioEPArecommendsBMPsbedesignedaccordingtothemethodology describedinthemostcurrenteditionoftheRainwaterandLand Developmentmanualorinanotherdesignmanualacceptableforuseby OhioEPAandinaccordancewithORCChapter4733.

TheBMPslistedinTables4aand4bbelowareconsideredstandard BMPsapprovedforgeneraluse.However,communitieswitharegulated MS4maylimittheuseofsomeoftheseBMPs.BMPsshallbedesigned suchthatthedraintimeislongenoughtoprovidetreatmentbutshort enoughtoprovidestorageforsuccessiverainfalleventsandavoidthe creationofnuisanceconditions.TheoutletstructureforthepostconstructionBMPshallnotdischargemorethanthefirsthalfoftheWQv inlessthanone-thirdoftheminimumdraintimelistedinTable4a.The WQvisthevolumeofstormwaterrunoffthatmustbedetainedbyapostconstructionpracticeasspecifiedbythemostrecenteditionofthe RainwaterandLandDevelopmentmanual.

Post-constructionpracticesshallbesizedtotreat100%oftheWQv associatedwiththeircontributingdrainagearea.Ifthereisanexisting post-constructionBMPthattreatsrunofffromthedisturbedareaandthe BMPmeetsthepost-constructionrequirementsofthispermit,no additionalpost-constructionBMPwillberequired.Aregionalstormwater BMPmaybeusedtomeetthepost-constructionrequirementif:(1)the BMPmeetsthedesignrequirementsfortreatingtheWQv;and(2)alegal agreementisestablishedthroughwhichtheregionalBMPowneror operatoragreestoprovidethisserviceinthelongterm.Design informationforsuchfacilitiessuchascontributingdrainageareas, capacities,elevations,outletdetailsanddraintimesshallbeincludedin theSWP3.

Table4aExtendedDetentionPost-ConstructionPracticeswithMinimumDrainTimes ExtendedDetentionPractices MinimumDrainTimeofWQv

WetExtendedDetentionBasin1,2,3 24hours

ExtendedDetentionConstructedWetland1,3 24hours

DryExtendedDetentionBasinwithForebayand Micropool1,3,4 48hours

PermeablePavementExtendedDetention1 24hours

UndergroundStorageFacilityExtendedDetention1,5 24hours

SandFilter-ExtendedDetention1,6 24hours

Notes:

1.TheoutletstructureshallnotdischargemorethanthefirsthalfoftheWQvinlessthan one-thirdoftheminimumdraintime.

2.ProvideapermanentpoolwithaminimumvolumeequaltotheWQvandanextended detentionvolumeabovethepermanentpoolequaltotheWQv.

3.Anadditionalvolumeequalto20percentoftheWQvshallbeincorporatedintothe BMPforsedimentstorage.

4.Dryextendeddetentionbasinsmustincludeaforebayandamicropooleachsizedata minimumof0.1xWQvandaprotectedoutlet,orincludeacceptablepretreatmentanda protectedoutlet.

5.Undergroundstoragemusthavepretreatmentforremovalofsuspendedsediments includedinthedesignanddocumentedintheSWP3.Thispretreatmentshallconcentrate sedimentinalocationwhereitcanbereadilyremoved.Fornon-infiltrating,underground extendeddetentionsystems,pretreatmentshallbeatleast50%effectiveatcapturing totalsuspendedsolidsaccordingtothetestingprotocolestablishedintheAlternative Post-ConstructionBMPTestingProtocol.

6.TheWQvpondingareashallcompletelyemptybetween24and72hours.

Table4bInfiltrationPost-ConstructionPracticeswithMaximumDrainTimes InfiltrationPractices MaximumDrainTimeofWQv

Bioretention1,2,3 24hours

InfiltrationBasin2,3 24hours

InfiltrationTrench3,4 48hours

PermeablePavementInfiltration3 48hours

UndergroundStorageFacilityInfiltration3,4,5 48hours

Notes:

1.Bioretentionsoilmediashallhaveapermeabilityofapproximately15in/hr.Meeting thesoilmediaspecificationsintheRainwaterandLandDevelopmentmanualis consideredcompliantwiththisrequirement.Bioretentioncellsmusthaveunderdrains unlessin-situconditionsallowfortheWQv(surfaceponding)plusthebioretentionsoil(to adepthof24inches)todraincompletelywithin48hours.

2.InfiltratingpracticeswiththeWQvstoredaboveground(bioretention,infiltrationbasin) shallfullydraintheWQvwithin24hourstominimizenuisanceeffectsofstandingwater andtopromotevigorouscommunitiesofappropriatevegetation.

3.TheSWP3shalldemonstratethedesigninfiltrationratevaluesarederivedfromsitespecificmeasurementsobtainedthroughfieldtestsofthein-situsoilforpractices designedtoinfiltratetheWQv.

4.SubsurfacepracticesdesignedtofullyinfiltratetheWQv(infiltrationtrench,permeable pavementwithinfiltration,undergroundstoragewithinfiltration)shallemptywithin48 hourstorecoverstorageforsubsequentstormevents.

5.Undergroundstoragesystemswithinfiltrationmusthaveadequatepretreatmentof suspendedsedimentsincludedinthedesignanddocumentedintheSWP3inorderto minimizecloggingoftheinfiltratingsurface.Pretreatmentshallconcentratesedimentina locationwhereitcanbereadilyremoved.Examplesincludemediafilterssituated

upstreamofthestorageorothersuitablealternativeapprovedbyOhioEPA.For infiltratingundergroundsystems,pretreatmentshallbeatleast80%effectiveatcapturing totalsuspendedsolidsaccordingtothetestingprotocolestablishedintheAlternative Post-ConstructionBMPTestingProtocol.

v.SmallConstructionActivities.Forallconstructionactivitiesauthorized underthispermitwhichresultinadisturbancelessthan2acres,apostconstructionpracticeshallbeusedtotreatstormwaterrunofffor pollutantsandtoreduceadverseimpactsonreceivingwaters.The applicantmustprovideajustificationintheSWP3whytheuseoftable4a and4bpracticesorrunoffreductionpracticearenotfeasible.The justificationmustaddresslimitingfactorswhichwouldprohibittheproject goingforwardshouldtable4aand4bpracticesberequired.Pleasenote thatpracticesselectedwillrequireapprovalfromtheregulatedMS4.

vi.TransportationProjects.Theconstructionofnewroadsandroadway improvementprojectsbypublicentities(i.e.,thestate,counties, townships,cities,orvillages)andtheconstructionofpubliclyaccessible, non-vehicular(i.e.,pedestrianorshared-use)pathsbypublicentitiesor non-governmental,non-profitorganizationsmayimplementpostconstructionBMPsincompliancewiththecurrentversion(asofthe beenacceptedbyOhioEPAasanalternativetotheconditionsofthis permit.

vii.OffsiteMitigationofPost-Construction.OhioEPAmayauthorizethe offsitemitigationofthepost-constructionrequirementsofPartIII.G.2.eof thispermitonacasebycasebasisprovidedthepermitteeclearly demonstratestheBMPslistedinTables4aand4barenotfeasibleand thefollowingcriteriaaremet:(1)amaintenanceagreementorpolicyis establishedtoensureoperationsandtreatmentlong-term;(2)theoffsite locationdischargestothesameHUC-12watershedunit;and(3)the mitigationratiooftheWQvis1.5to1ortheWQvatthepointofretrofit, whicheverisgreater.Requestsforoffsitemitigationmustbereceived priortoreceiptoftheNOIapplication.

viii.PreviouslyDevelopedAreas.OhioEPAencouragestheredevelopmentof untreatedimperviousareasthroughareductionoftheWQvtreatment requirement.Foranuntreatedpreviouslydevelopedarea,oneora combinationofthefollowingtwoconditionsshallbemet:

throughimperviousareareductionwithsoilrestorationorreplacing imperviousroofareawithgreenroofarea(forthesepurposesgreen roofsshallbeconsideredpervioussurface)or TreatmentofaportionofthesiteusingapracticemeetingTable 4a/4bcriteriaforwhichtheWQv(seeEquation1)equalsorexceeds theWQvRdeterminedwiththefollowingequation:

WQvR=P*A*[(Rv1*0.2)+(Rv2-Rv1)]/12(Equation3)

where

WQvR=RedevelopmentWaterQualityVolumeinacre-feet

P=0.90inches

A=disturbedareainacres

Rv1=volumetricrunoffcoefficientforexisting(currentsite) conditionswithinthedisturbedarea

Rv2=volumetricrunoffcoefficientforproposed(post-construction site)conditionswithinthedisturbedarea

andislocatedtotreatimperviousareasmostlikelytogeneratethe highestpollutantload,suchasparkinglotsorroadways.

Thissectiondoesnotapplytopreviousdevelopmentthatwas obligatedtoobtainCGPcoverageandprovidemanagementofthe WQvunderpreviousgenerationsofthisgeneralpermit(i.e.,after April21,2003).

ix.RunoffReductionPractices.Thesizeofstructuralpost-construction practicesusedtocaptureandtreattheWQvcanbereducedby incorporatingrunoffreducingpracticesintothede drainagesystem.Theapproachtocalculateanddocumentrunoff reductionisdetailedintheRainwaterandLandDevelopmentManual. BMP-specificrunoffreductionvolumesaresetbyspecificationsinthe RainwaterandLandDevelopmentManualforthefollowingpractices:

Impervioussurfacedisconnection

Rainwaterharvesting

Bioretention

Infiltrationbasin

Infiltrationtrench

Permeablepavementwithinfiltration

Undergroundstoragewithinfiltration

Grassswale

Sheetflowtofilterstrip

Sheetflowtoconservationarea

Arunoffreductionapproachmaybeusedtomeetthegroundwater rechargerequirementsintheBigDarbyCreekWatershed.Therunoff reductionpracticesusedforgroundwaterrechargemaybeusedto reducetheWQvrequirement,seeappendixAfordetailson groundwaterrechargerequirements.

Inordertopromotetheimplementationofgreeninfrastructure,the Directormayconsidertheuseofrunoffreducingpracticestodemonstrate compliancewithPartIII.G.2.eofthispermitforareasofthesitenot drainingintoacommondrainagesystemofthesite,e.g.,sheetflowfrom

perimeterareassuchastherearyardsofresidentiallots,lowdensity developmentscenarios,orwherethepermitteecandemonstratethatthe intentofpollutantremovalandstreamprotection,asrequiredinPart III.G.2.eofthispermitisbeingaddressedthroughnon-structuralpostconstructionBMPsbaseduponreviewandapprovalbyOhioEPA.

x.UseofAlternativePost-ConstructionBMPs.Thispermitdoesnot precludetheuseofinnovativeorexperimentalpost-construction stormwatermanagementtechnologies.Permitteesshallrequest approvalfromOhioEPAtousealternativepost-constructionBMPsona case-by-casebasis.Thepermitteeshallsubmitanapplication(form maintainedontheOhioEPAWebsite)toOhioEPAforanyproposed alternativepost-constructionBMPandsecureanyapprovalfromOhio EPAbeforepermitteessubmitanNOIforpermitcoverage.Wherethe developmentprojectislocatedwithinaregulatedmunicipalseparate stormsewersystem(MS4)community,theuseofanalternative practicerequirespre-approvalbytheMS4beforesubmittalofthe applicationtoOhioEPA.OhioEPArequiresthatapprovalsfor alternativepost-constructionBMPsarefinalized.

Touseanalternativepost-constructionBMP,thepermitteemust demonstratethatuseofaBMPlistedinTables4aand4bisnotfeasible andtheproposedalternativepost-constructionBMPmeetsthefollowing threecriteria:

a.Alternativepost-constructionBMPsmustbecapableofproviding sustained,long-termtreatmentofstormwater.Itmustbedurableand maintainableinaccordancewithindustrystandards.

b.Alternativepost-constructionBMPsshallpreviouslyhavebeentested toconfirmstormwatertreatmentefficacyequivalenttothoseBMPs listedinTables4aand4busingtheprotocoldescribedinthispermit. BMPtestingmayincludelaboratorytesting,fieldtesting,orboth.Foran alternativeBMPtobeacceptable,thetestresultsmustdemonstrate thattheminimumtreatmentrateis80%TSSremovalatthedesignflow rateforlaboratorytestedBMP.Fieldtestresultsmustdemonstratethe minimumtreatmentrateis80%TSSremovalforinfluentconcentrations equaltoorgreaterthan100mg/LTSS.Iftheinfluentconcentrationto theproposedalternativeBMPislessthan100mg/LTSSinthefield, thentheBMPmustachieveanaverageeffluentconcentrationlessthan orequalto20mg/LTSS.

c.Thedischargeratefromtheproposedalternativepracticeshallbe reducedtopreventstreambederosionandprotectthephysicaland biologicalstreamintegrityunlesstherewillbenegligiblehydrological impacttothereceivingsurfacewaterofthestate.Dischargerateis consideredtohaveanegligibleimpactifthepermitteecan demonstratethattheentireWQvisrechargedtogroundwater,the largercommonplanofdevelopmentorsalewillcreatelessthanone acreofimpervioussurfaceorthestormwaterdrainagesystemofthe

developmentdischargesdirectlyintoalargeriverwithdrainagearea equalto100squaremilesorlargerupstreamofthedevelopmentsite ortoalakewherethedevelopmentareaislessthan5percentofthe watershedarea,unlessaTMDLhasidentifiedwaterqualityproblems intothereceivingsurfacewatersofthestate.Iftheconditionsabove thatminimizethepotentialforhydrologicalimpacttothereceiving surfacewaterofthestatedonotexist,thenthealternativepostconstructionBMPmustpreventstreamerosionbyreducingtheflow ratefromtheWQV.Insuchcases,dischargeoftheWQVmustbe controlled.AsecondstormwaterBMPthatprovidesextended detentionoftheWQvmaybeneededtomeetthepost-construction criteria.

AlternativeBMPsthatutilizetreatmentprocessessuchasfilteringor centrifugalseparation,ratherthanadetentionandsettlingvolume, mustbedesignedtoensuretreatmentof90percentoftheaverage annualrunoffvolume.ForthedesignoftheseBMPs,thewaterquality flowrate(WQF)shallbedeterminedutilizingtheRationalMethod (Equation4)withanintensity(i)appropriateforthewaterquality precipitationevent.Thisintensityshallbecalculatedusingthetable giveninAppendixC.

WQF=waterqualityflowrateincubicfeetpersecond(cfs) C=rationalmethodrunoffcoefficient i=intensity(in/hr)

A=areadrainingtotheBMP(acres)

xi.AlternativePost-ConstructionBMPTestingProtocol.Forlaboratory testing,thealternativeBMPshallbetestedusingsedimentwitha specificgravityof2.65,aparticlesizedistributioncloselymatchingthe distributionshowninTable5,andtotalsuspendedsediment(TSS) concentrationswithin10%of200mg/L(180mg/L220mg/LTSS).

Table5ParticleSizeDistributionforTestingAlternativePost-ConstructionBMPs

WQF=C*i*A (Equation4) Where

Forfieldtesting,thealternativeBMPshallbetestedusingstormwater runofffromthefield,notalteredbyaddingaggregateorsubjectingto unusuallyhighsedimentloadssuchasthosefromunstabilized constructiondisturbance.Thestormwaterrunoffusedforfieldtesting shallberepresentativeofrunofffromtheproposedinstallationsitefor thealternativeBMPafterallconstructionactivitieshaveceasedandthe groundhasbeenstabilized.TheinfluentandeffluentTSS concentrationsofstormwaterrunoffmustbecollectedinthefield.

Testingofalternativepost-constructionBMPsshallbeperformedor overseenbyaqualifiedindependent,third-partytesting organization;

Testingshalldemonstratethemaximumflowrateatwhichthe alternativepost-constructionBMPcanachievethenecessary treatmentefficacy,includingconsiderationforthepotentialof sedimentresuspension;

Testingshalldemonstratethemaximumvolumeofsedimentand floatablesthatcanbecollectedinthealternativepost-construction BMPbeforepollutantsmustberemovedtomaintain80%treatment efficacy;

Testingshallindicatetherecommendedmaintenancefrequency andmaintenanceprotocoltoensureongoingperformanceofthe alternativepost-constructionBMP.

Thealternativepost-constructionBMPtestingprotocoldescribedinthis sectionissimilartotestingrequirementsspecifiedbytheNewJersey DepartmentofEnvironmentalProtection(NJDEP)forstormwater ManufacturedTreatmentDevices(MTD)andthereforetestingresults certifiedbyNJDEPshallbeacceptedbyOhioEPA.ForalistofBMPs thathavebeencertifiedbyNJDEP,seethewebsite: www.njstormwater.org.

Anothernationallyrecognizedstormwaterproducttestingprocedureis theTechnologyAssessmentProtocolEcology(TAPE)administered bytheStateofWashington,DepartmentofEcology.Testingresultsfor aproposedalternativepost-constructionBMPcertifiedbyTAPEunder theirgeneralusedesignationandbasictreatmentcategoryshallbe acceptedbyOhioEPA.TheStateofWashington,Departmentof Ecologywebsiteishttps://ecology.wa.gov/

Alternativepost-constructionBMPsmayinclude,butarenotlimitedto: vegetatedswales,vegetatedfilterstrips,hydrodynamicseparators, high-flowmediafilters,cartridgefilters,membranefilters,subsurface flowwetlands,multi-chambertreatmenttrains,roadshouldermedia filterdrains,wetlandchannels,rainbarrels,greenroofs,andrain gardens.TheDirectormayalsoconsidernon-structuralpostconstructionapproaches.

f.SurfaceWaterProtection.Iftheprojectsitecontainsanystreams,rivers,lakes, wetlandsorothersurfacewaters,certainconstructionactivitiesatthesitemaybe regulatedundertheCWAand/orstateisolatedwetlandpermitrequirements. Sections404and401oftheActregulatethedischargeofdredgedorfillmaterial intosurfacewatersandtheimpactsofsuchactivitiesonwaterquality, respectively.Constructionactivitiesinsurfacewaterswhichmaybesubjectto CWAregulationand/orstateisolatedwetlandpermitrequirementsinclude,but arenotlimitedto:sewerlinecrossings,grading,backfillingorculvertingstreams, fillingwetlands,roadandutilitylineconstruction,bridgeinstallationand installationofflowcontrolstructures.Iftheprojectcontainsstreams,rivers,lakes orwetlandsorpossiblewetlands,thepermitteeshallcontacttheappropriateU.S. ArmyCorpsofEngineersDistrictOffice.(CAUTION:Anyareaofseasonallywet hydricsoilisapotentialwetland-pleaseconsulttheSoilSurveyandlistofhydric

District.IfyouhaveanyquestionsaboutSection401waterqualitycertification, pleasecontacttheOhioEnvironmentalProtectionAgency,Section401 Coordinator.)

U.S.ArmyCorpsofEngineers(Section404regulation): Huntington,WVDistrict(304)399-5210(MuskingumRiver,Hocking River,SciotoRiver,LittleMiamiRiver,andGreatMiamiRiverBasins) Buffalo,NYDistrict(716)879-4330(LakeErieBasin) Pittsburgh,PADistrict(412)395-7155(MahoningRiverBasin) Louisville,KYDistrict(502)315-6686(OhioRiver)

OhioEPA401/404andnon-jurisdictionalstream/wetlandcoordinatorcanbe contactedat(614)644-2001(allofOhio)

ConcentratedstormwaterrunofffromBMPstonaturalwetlandsshallbe convertedtodiffuseflowbeforetherunoffentersthewetlands.Theflowshould bereleasedsuchthatnoerosionoccursdownslope.Levelspreadersmayneed tobeplacedinseries,particularlyonsteepslopedsites,toensurenon-erosive velocities.OtherstructuralBMPsmaybeusedbetweenstormwaterfeaturesand naturalwetlands,inordertoprotectthenaturalhydrology,hydroperiod,and wetlandflora.Iftheapplicantproposestodischargetonaturalwetlands,a hydrologicanalysisshallbeperformed.Theapplicantshallattempttomatchthe pre-developmenthydroperiodsandhydrodynamicsthatsupportthewetland. Theapplicantshallassesswhethertheirconstructionactivitywilladversely impactthehydrologicfloraandfaunaofthewetland.Practicessuchas vegetativebuffers,infiltrationbasins,conservationofforestcover,andthe preservationofintermittentstreams,depressions,anddrainagecorridorsmaybe usedtomaintainwetlandhydrology.

g.Othercontrols.

i.Non-SedimentPollutantControls.InaccordancewithPartII.E,no solid(otherthansediment)orliquidwaste,includingbuildingmaterials, shallbedischargedinstormwaterrunoff.Thepermitteemustimplement allnecessaryBMPstopreventthedischargeofnon-sedimentpollutants tothedrainagesystemofthesiteorsurfacewatersofthestateoran

MS4.Undernocircumstanceshallwastewaterfromthewashoutof concretetrucks,stucco,paint,formreleaseoils,curingcompounds,and otherconstructionmaterialsbedischargeddirectlyintoadrainage channel,stormsewerorsurfacewatersofthestate.Also,nopollutants fromvehiclefuel,oils,orothervehiclefluidscanbedischargedtosurface watersofthestate.Noexposureofstormwatertowastematerialsis recommended.TheSWP3mustincludemethodstominimizethe exposureofbuildingmaterials,buildingproducts,constructionwastes, trash,landscapematerials,fertilizers,pesticides,herbicides,detergents, andsanitarywastetoprecipitation,stormwaterrunoff,andsnowmelt.In accordancewithPartII.D.3,theSWP3shallincludemeasurestoprevent andrespondtochemicalspillsandleaks.Youmayalsoreferencethe existenceofotherplans(i.e.,SpillPreventionControland Countermeasure(SPCC)plans,spillcontrolprograms,SafetyResponse Plans,etc.)providedthatsuchplanaddressesconditionsofthispermit conditionandacopyofsuchplanismaintainedonsite.

ii.Off-sitetraffic.Off-sitevehicletrackingofsedimentsanddust generationshallbeminimized.InaccordancewithPartII.D.1,theSWP3 shallincludemethodstominimizethedischargeofpollutantsfrom equipmentandvehiclewashing,wheelwashwater,andother washwaters.Nodetergentsmaybeusedtowashvehicles.Washwaters shallbetreatedinasedimentbasinoralternativecontrolthatprovides equivalenttreatmentpriortodischarge.

iii.Compliancewithotherrequirements.TheSWP3shallbeconsistent withapplicableStateand/orlocalwastedisposal,sanitarysewerorseptic systemregulations,includingprovisionsprohibitingwastedisposalby openburningandshallprovidefortheproperdisposalofcontaminated soilstotheextentthesearelocatedwithinthepermittedarea.

iv.Trenchandgroundwatercontrol.InaccordancewithPartII.C,there shallbenoturbiddischargestosurfacewatersofthestateresultingfrom dewateringactivities.Iftrenchorgroundwatercontainssediment,itshall passthroughasedimentsettlingpondorotherequallyeffectivesediment controldevice,priortobeingdischargedfromtheconstructionsite. Alternatively,sedimentmayberemovedbysettlinginplaceorby dewateringintoasumppit,filterbagorcomparablepractice.Ground waterwhichdoesnotcontainsedimentorotherpollutantsisnotrequired tobetreatedpriortodischarge.However,caremustbetakenwhen discharginggroundwatertoensurethatitdoesnotbecomepollutantladenbytraversingoverdisturbedsoilsorotherpollutantsources.

v.ContaminatedSediment.Whereconstructionactivitiesaretooccuron siteswithcontaminationfrompreviousactivities,operatorsshallbeaware thatconcentrationsofmaterialsthatmeetothercriteria(isnotconsidered aHazardousWaste,meetingVAPstandards,etc.)maystillresultin stormwaterdischargesinexcessofOhioWaterQualityStandards.Such dischargesarenotauthorizedbythispermit.AppropriateBMPsinclude, butarenotlimitedto:

Theuseofberms,trenches,andpitstocollectcontaminated runoffandpreventdischarges; Pumpingrunoffintoasanitarysewer(withpriorapprovalofthe sanitaryseweroperator)orintoacontainerfortransporttoan appropriatetreatment/disposalfacility;and Coveringareasofcontaminationwithtarpsorothermethodsthat preventstormwaterfromcomingintocontactwiththematerial.

OperatorsshouldconsultwithOhioEPADivisionofSurfaceWaterprior toseekingpermitcoverage.

h.Maintenance.Alltemporaryandpermanentcontrolpracticesshallbemaintained andrepairedasneededtoensurecontinuedperformanceoftheirintended function.Allsedimentcontrolpracticesmustbemaintainedinafunctional conditionuntilallup-slopeareastheycontrolarepermanentlystabilized.The SWP3shallbedesignedtominimizemaintenancerequirements.Theapplicant shallprovideadescriptionofmaintenanceproceduresneededtoensurethe continuedperformanceofcontrolpractices.

i.Inspections.

conductinspectionstoensurethatthecontrolpracticesarefunctionalandto evaluatewhethertheSWP3isadequateandproperlyimplementedin accordancewiththescheduleproposedinPartIII.G.1.hofthispermitorwhether additionalcontrolmeasuresarerequired.Ataminimum,proceduresinaSWP3 shallprovidethatallcontrolsonthesiteareinspected:

afteranystormeventgreaterthanone-halfinchofrainper24-hourperiod bytheendofthenextcalendarday,excludingweekendsandholidays unlessworkisscheduled;and onceeverysevencalendardays.

Theinspectionfrequencymaybereducedtoatleastonceeverymonthfor dormantsitesif:

theentiresiteistemporarilystabilizedor runoffisunlikelyduetoweatherconditionsforextendedperiodsoftime (e.g.,siteiscoveredwithsnow,ice,orthegroundisfrozen).

Thebeginningandendingdatesofanyreducedinspectionfrequencyshallbe documentedintheSWP3.Onceadefinableareahasachievedfinalstabilization, theareamaybemarkedontheSWP3andnofurtherinspectionrequirements shallapplytothatportionofthesite.

Followingeachinspection,achecklistmustbecompletedandsignedbythe qualifiedinspectionpersonnelrepresentative.Inspectionreportsmaybe prepared,signed,andkeptelectronically,ratherthaninpaperform,iftherecords are:(a)inaformatthatcanbereadinasimilarmannerasapaperrecord;(b) legallydependablewithnolessevidentiaryvaluethantheirpaperequivalent;and (c)immediatelyaccessibletotheinspectorduringaninspectiontothesame extentasapapercopystoredatthesitewouldbe,iftherecordswerestoredin

paperform.Foradditionalguidanceontheproperpracticestofollowforthe electronicretentionofinspectionreportrecords,refertothis FactSheetathttps://epa.ohio.gov/divisions-and-offices/surfacewater/permitting/storm-water-discharges-from-small-and-largeconstruction-activities--general-permit.Ataminimum,theinspectionreport shallinclude:

i.theinspectiondate;

ii.names,titles,andqualificationsofpersonnelmakingtheinspection;

iii.weatherinformationfortheperiodsincethelastinspection(orsince commencementofconstructionactivityifthefirstinspection)includingabest estimateofthebeginningofeachstormevent,durationofeachstormevent, approximateamountofrainfallforeachstormevent(ininches),andwhether anydischargesoccurred;

iv.weatherinformationandadescriptionofanydischargesoccurringatthetime oftheinspection;

v.location(s)ofdischargesofsedimentorotherpollutantsfromthesite;

vi.location(s)ofBMPsthatneedtobemaintained;

vii.location(s)ofBMPsthatfailedtooperateasdesignedorprovedinadequate foraparticularlocation;

viii.location(s)whereadditionalBMPsareneededthatdidnotexistatthetimeof inspection;and

ix.correctiveactionrequiredincludinganychangestotheSWP3necessaryand implementationdates.

Disturbedareasandareasusedforstorageofmaterialsthatareexposedto precipitationshallbeinspectedforevidenceoforthepotentialforpollutants enteringthedrainagesystem.Erosionandsedimentcontrolmeasuresidentified intheSWP3shallbeobservedtoensurethatthoseareoperatingcorrectly. Dischargelocationsshallbeinspectedtoascertainwhethererosionand sedimentcontrolmeasuresareeffectiveinpreventingsignificantimpactstothe receivingwaters.Locationswherevehiclesenterorexitthesiteshallbe inspectedforevidenceofoff-sitevehicletracking.

Thepermitteeshallmaintainforthreeyearsfollowingthesubmittalofanoticeof terminationform,arecordsummarizingtheresultsoftheinspection,names(s) andqualificationsofpersonnelmakingtheinspection,thedate(s)ofthe inspection,majorobservationsrelatingtotheimplementationoftheSWP3anda certificationastowhetherthefacilityisincompliancewiththeSWP3andthe permitandidentifyanyincidentsofnon-compliance.Therecordandcertification shallbesignedinaccordancewithPartV.G.ofthispermit.

i.Whenpracticesrequirerepairormaintenance.Iftheinspection revealsthatacontrolpracticeisinneedofrepairormaintenance,with theexceptionofasedimentsettlingpond,itshallberepairedor maintainedwithin3daysoftheinspection.Sedimentsettlingpondsshall berepairedormaintainedwithin10daysoftheinspection.

ii.Whenpracticesfailtoprovidetheirintendedfunction.Ifthe inspectionrevealsthatacontrolpracticefailstoperformitsintended

functionandthatanother,moreappropriatecontrolpracticeisrequired, theSWP3shallbeamendedandthenewcontrolpracticeshallbe installedwithin10daysoftheinspection.

iii.WhenpracticesdepictedontheSWP3arenotinstalled.Ifthe inspectionrevealsthatacontrolpracticehasnotbeenimplementedin accordancewiththeschedulecontainedinPartIII.G.1.hofthispermit,the controlpracticeshallbeimplementedwithin10daysfromthedateofthe inspection.Iftheinspectionrevealsthattheplannedcontrolpracticeis notneeded,therecordshallcontainastatementofexplanationastowhy thecontrolpracticeisnotneeded.

3.ApprovedStateorlocalplans.Alldischargersregulatedunderthisgeneralpermit mustcomply,exceptthoseexemptedunderstatelaw,withthelawfulrequirementsof municipalities,countiesandotherlocalagenciesregardingdischargesofstormwater fromconstructionactivities.Allerosionandsedimentcontrolplansandstormwater managementplansapprovedbylocalofficialsshallberetainedwiththeSWP3prepared inaccordancewiththispermit.Applicablerequirementsforerosionandsediment controlandstormwatermanagementapprovedbylocalofficialsare,uponsubmittalofa NOIform,incorporatedbyreferenceandenforceableunderthispermiteveniftheyare notspecificallyincludedinanSWP3requiredunderthispermit.Whentheprojectis locatedwithinthejurisdictionofaregulatedmunicipalseparatestormsewersystem (MS4),thepermitteeshallcertifythattheSWP3complieswiththerequirementsofthe stormwatermanagementprogramoftheMS4operator.

4.Exceptions.Ifspecificsiteconditionsprohibittheimplementationofanyoftheerosion andsedimentcontrolpracticescontainedinthispermitorsite-specificconditionsare suchthatimplementationofanyerosionandsedimentcontrolpracticescontainedinthis permitwillresultinnoenvironmentalbenefit,thenthepermitteeshallprovidejustification forrejectingeachpracticebasedonsiteconditions.Exceptionsfromimplementingthe erosionandsedimentcontrolstandardscontainedinthispermitwillbeapprovedor deniedonacase-by-casebasis.

ThepermitteemayrequestapprovalfromOhioEPAtousealternativemethodstosatisfy conditionsinthispermitifthepermitteecandemonstratethatthealternativemethods aresufficienttoprotecttheoverallintegrityofreceivingstreamsandthewatershed. Alternativemethodswillbeapprovedordeniedonacase-by-casebasis.

PARTIV.NOTICEOFTERMINATIONREQUIREMENTS

A.Failuretonotify.

ThetermsandconditionsofthispermitshallremainineffectuntilasignedNoticeof Termination(NOT)formissubmittedandpermitcoverageisterminatedbyOhioEPA.Failure tosubmitanNOTconstitutesaviolationofthispermitandmayaffecttheabilityofthepermittee toobtaingeneralpermitcoverageinthefuture.

1.PermitteeswishingtoterminatecoverageunderthispermitshallsubmitanNOTformin accordancewithPartV.G.ofthispermit.Compliancewiththispermitisrequireduntilan NOTformissubmittedandpermitcoverageisterminatedbyOhioEPA.Priorto submittingtheNOTform,thepermitteeshallconductasiteinspectioninaccordance withPartIII.G.2.iofthispermitandhaveamaintenanceplaninplacetoensureallpostconstructionBMPswillbemaintainedinperpetuity.

2.AllpermitteesshallsubmitanNOTformwithin45daysofcompletingallpermit requirements.EnforcementactionsmaybetakenifapermitteesubmitsanNOTform withoutmeetingoneormoreofthefollowingconditions:

a.Finalstabilization(seedefinitioninPartVII)hasbeenachievedonallportionsof thesiteforwhichthepermitteeisresponsible(including,ifapplicable,returning agriculturallandtoitspre-constructionagriculturaluse);

b.Anotheroperator(s)hasassumedcontroloverallareasofthesitethathavenot beenfinallystabilized;

c.AmaintenanceplanisinplacetoensureallpostconstructionBMPsare adequatelymaintainedinthelong-term;

d.Fornon-residentialdevelopments,allelementsofthestormwaterpollution preventionplanhavebeencompleted,thedisturbedsoilattheidentifiedfacility havebeenstabilizedandtemporaryerosionandsedimentcontrolmeasures havebeenremovedattheappropriatetime,orallstormwaterdischarges associatedwithconstructionactivityfromtheidentifiedfacilitythatareauthorized bytheabovereferencedNPDESgeneralpermithaveotherwisebeeneliminated. (i)Forresidentialdevelopmentsonly,temporarystabilizationhasbeencompleted andthelot,whichincludesahome,hasbeentransferredtothehomeowner;(ii) finalstabilizationhasbeencompletedandthelot,whichdoesnotincludea home,hasbeentransferredtothepropertyowner;(iii)nostabilizationhasbeen implementedonalot,whichincludesahome,andthelothasbeentransferredto thehomeowner;or

e.AnexceptionhasbeengrantedunderPartIII.G.4.

C.HowtosubmitanNOT.

Toterminatepermitcoverage,thepermiteeshallsubmitacompleteandaccurateNoticeof availablethrough theOhioEPAeBusinessCenterat:https://ebiz.epa.ohio.gov/.SubmissionthroughtheOhio EPAeBusinessCenterwillrequireestablishinganOhioEPAeBusinessCenteraccountand obtainingauniquePersonalIdentificationNumber(PIN)forfinalsubmissionofthe NOT.ExistingeBusinessCenteraccountholderscanaccesstheNOTformthroughtheir existingaccountandsubmitusingtheirexistingPIN.Pleaseseethefollowinglinkforguidance: https://epa.ohio.gov/divisions-and-offices/surface-water/permitting/electronic-businessservices-sub/streams.Alternatively,ifyouareunabletoaccesstheNOTformthroughthe agencyeBusinessCenterduetoademonstratedhardship,theNOTmaybesubmittedonpaper NOTformsprovidedbyOhioEPA.NOTinformationshallbetypedontheform.Pleasecontact

OhioEPA,DivisionofSurfaceWaterat(614)644-2001ifyouwishtoreceiveapaperNOT form.

PARTV.STANDARDPERMITCONDITIONS.

A.Dutytocomply.

Thepermitteeshallcomplywithallconditionsofthispermit.Anypermitnoncompliance constitutesaviolationofORCChapter6111andisgroundsforenforcementaction.

Ohiolawimposespenaltiesandfinesforpersonswhoknowinglymakefalsestatementsor knowinglyswearoraffirmthetruthofafalsestatementpreviouslymade.

B.Continuationofanexpiredgeneralpermit.

Anexpiredgeneralpermitcontinuesinforceandeffectuntilanewgeneralpermitisissued.

C.Needtohaltorreduceactivitynotadefense.

Itshallnotbeadefenseforapermitteeinanenforcementactionthatitwouldhavebeen necessarytohaltorreducethepermittedactivityinordertomaintaincompliancewiththe conditionsofthispermit.

D.Dutytomitigate.

Thepermitteeshalltakeallreasonablestepstominimizeorpreventanydischargeinviolation ofthispermitwhichhasareasonablelikelihoodofadverselyaffectinghumanhealthorthe environment.

E.Dutytoprovideinformation.

Thepermitteeshallfurnishtothedirector,within10daysofwrittenrequest,anyinformation whichthedirectormayrequesttodeterminewhethercauseexistsformodifying,revokingand reissuing,orterminatingthispermitortodeterminecompliancewiththispermit.Thepermittee shallalsofurnishtothedirectoruponrequestcopiesofrecordsrequiredtobekeptbythis permit.

F.Otherinformation.

Whenthepermitteebecomesawarethatheorshefailedtosubmitanyrelevantfactsor submittedincorrectinformationintheNOI,SWP3,NOTorinanyotherreporttothedirector,he orsheshallpromptlysubmitsuchfactsorinformation.

G.Signatoryrequirements.

AllNOIs,NOTs,SWP3s,reports,certificationsorinformationeithersubmittedtothedirectoror thatthispermitrequirestobemaintainedbythepermittee,shallbesigned.

1.Theseitemsshallbesignedasfollows:

a.Foracorporation:Byaresponsiblecorporateofficer.Forthepurposeofthis section,aresponsiblecorporateofficermeans:

i.Apresident,secretary,treasurerorvice-presidentofthecorporationin chargeofaprincipalbusinessfunctionoranyotherpersonwhoperforms similarpolicyordecision-makingfunctionsforthecorporation;or

ii.Themanagerofoneormoremanufacturing,productionoroperating facilities,provided,themanagerisauthorizedtomakemanagement decisionsthatgoverntheoperationoftheregulatedfacilityincluding havingtheexplicitorimplicitdutyofmakingmajorcapitalinvestment recommendationsandinitiatinganddirectingothercomprehensive measurestoassurelong-termenvironmentalcompliancewith environmentallawsandregulations;themanagercanensurethatthe necessarysystemsareestablishedoractionstakentogathercomplete andaccurateinformationforpermitapplicationrequirements;andwhere authoritytosigndocumentshasbeenassignedordelegatedtothe managerinaccordancewithcorporateprocedures;

b.Forapartnershiporsoleproprietorship:Byageneralpartnerortheproprietor, respectively;or

c.Foramunicipality,State,Federalorotherpublicagency:Byeitheraprincipal executiveofficerorrankingelectedofficial.Forpurposesofthissection,a principalexecutiveofficerofaFederalagencyincludes(1)thechiefexecutive officeroftheagencyor(2)aseniorexecutiveofficerhavingresponsibilityforthe overalloperationsofaprincipalgeographicunitoftheagency(e.g.,Regional AdministratorsofU.S.EPA).

2.Allreportsrequiredbythepermitsandotherinformationrequestedbythedirectorshall besignedbyapersondescribedinPartV.G.1ofthispermitorbyadulyauthorized representativeofthatperson.Apersonisadulyauthorizedrepresentativeonlyif:

a.TheauthorizationismadeinwritingbyapersondescribedinPartV.G.1ofthis permitandsubmittedtothedirector;

b.Theauthorizationspecifieseitheranindividualorapositionhavingresponsibility fortheoveralloperationoftheregulatedfacilityoractivity,suchasthepositionof manager,operatorofawellorwellfield,superintendent,positionofequivalent responsibilityoranindividualorpositionhavingoverallresponsibilityfor environmentalmattersforthecompany.(Adulyauthorizedrepresentativemay thusbeeitheranamedindividualoranyindividualoccupyinganamedposition); and

c.Thewrittenauthorizationissubmittedtothedirector.

3.Changestoauthorization.IfanauthorizationunderPartV.G.2ofthispermitisnolonger accuratebecauseadifferentindividualorpositionhasresponsibilityfortheoverall operationofthefacility,anewauthorizationsatisfyingtherequirementsofPartV.G.2of

thispermitmustbesubmittedtothedirectorpriortoortogetherwithanyreports, informationorapplicationstobesignedbyanauthorizedrepresentative.

H.Certification.

Anypersonsigningdocumentsunderthissectionshallmakethefollowingcertification:

"Icertifyunderpenaltyoflawthatthisdocumentandallattachmentswere preparedundermydirectionorsupervisioninaccordancewithasystem designedtoassurethatqualifiedpersonnelproperlygatheredandevaluatedthe informationsubmitted.Basedonmyinquiryofthepersonorpersonswho managethesystemorthosepersonsdirectlyresponsibleforgatheringthe information,theinformationsubmittedis,tothebestofmyknowledgeandbelief, true,accurateandcomplete.Iamawarethattherearesignificantpenaltiesfor submittingfalseinformation,includingthepossibilityoffineandimprisonmentfor knowingviolations."

I.Oilandhazardoussubstanceliability.

Nothinginthispermitshallbeconstruedtoprecludetheinstitutionofanylegalactionorrelieve thepermitteefromanyresponsibilities,liabilitiesorpenaltiestowhichthepermitteeisormaybe subjectundersection311oftheCWAor40CFRPart112.40CFRPart112establishes procedures,methodsandequipmentandotherrequirementsforequipmenttopreventthe dischargeofoilfromnon-transportation-relatedonshoreandoffshorefacilitiesintooruponthe navigablesurfacewatersofthestateoradjoiningshorelines.

J.Propertyrights.

Theissuanceofthispermitdoesnotconveyanypropertyrightsofanysort,noranyexclusive privileges,nordoesitauthorizeanyinjurytoprivatepropertynoranyinvasionofpersonalrights, noranyinfringementofFederal,Stateorlocallawsorregulations.

K.Severability.

Theprovisionsofthispermitareseverableandifanyprovisionofthispermitortheapplication ofanyprovisionofthispermittoanycircumstanceisheldinvalid,theapplicationofsuch provisiontoothercircumstancesandtheremainderofthispermitshallnotbeaffectedthereby.

L.Transfers.

OhioNPDESgeneralpermitcoverageistransferable.OhioEPAmustbenotifiedinwritingsixty dayspriortoanyproposedtransferofcoverageunderanOhioNPDESgeneralpermit.The transfereemustinformOhioEPAitwillassumetheresponsibilitiesoftheoriginalpermittee transferor.

M.Environmentallaws.

Noconditionofthispermitshallreleasethepermitteefromanyresponsibilityorrequirements underotherenvironmentalstatutesorregulations.

N.Properoperationandmaintenance.

Thepermitteeshallatalltimesproperlyoperateandmaintainallfacilitiesandsystemsof treatmentandcontrol(andrelatedappurtenances)whichareinstalledorusedbythepermittee toachievecompliancewiththeconditionsofthispermitandwiththerequirementsofSWP3s. Properoperationandmaintenancerequirestheoperationofbackuporauxiliaryfacilitiesor similarsystems,installedbyapermitteeonlywhennecessarytoachievecompliancewiththe conditionsofthepermit.

O.Inspectionandentry.

ThepermitteeshallallowthedirectororanauthorizedrepresentativeofOhioEPA,uponthe presentationofcredentialsandotherdocumentsasmayberequiredbylaw,to:

1.Enteruponthepermittee'spremiseswherearegulatedfacilityoractivityislocatedor conductedorwhererecordsmustbekeptundertheconditionsofthispermit;

2.Haveaccesstoandcopyatreasonabletimes,anyrecordsthatmustbekeptunderthe conditionsofthispermit;

3.Inspectatreasonabletimesanyfacilitiesorequipment(includingmonitoringandcontrol equipment);and

4.Sampleormonitoratreasonabletimes,forthepurposesofassuringpermitcompliance orasotherwiseauthorizedbytheCleanWaterAct,anysubstancesorparametersat anylocation.

P.DutytoReapply.

Ifthepermitteewishestocontinueanactivityregulatedbythispermitaftertheexpirationdateof thispermit,thepermitteemustapplyforandobtainanewpermit.

Q.PermitActions.

Thispermitmaybemodified,revokedandreissued,orterminatedforcause.Thefilingofa requestbythepermitteeforapermitmodification,revocationandreissuance,ortermination,or anotificationofplannedchangesoranticipatednoncompliancedoesnotstayanypermit condition.

R.Bypass. C. S.Upset.

Theprovisionsof40CFRSection122.41(n),relating GG.

T.MonitoringandRecords.

specificallyincorporatedhereinbyreferenceintheirentirety.

U.ReportingRequirements.

specificallyincorporatedhereinbyreferenceintheirentirety.

V.GeneralEffluentLimitation

Theeffluentshall,atalltimes,befreeofsubstances:

1.Inamountsthatwillsettletoformputrescent,orotherwiseobjectionable,sludge deposits;orthatwilladverselyaffectaquaticlifeorwaterfowl;

2.Ofanoily,greasy,orsurface-activenature,andofotherfloatingdebris,inamountsthat willformnoticeableaccumulationsofscum,foam,orsheen;

3.Inamountsthatwillalterthenaturalcolororodorofthereceivingwatertosuchdegree astocreateanuisance;

4.Inamountsthateithersinglyorincombinationwithothersubstancesaretoxictohuman, animal,oraquaticlife;

5.Inamountsthatareconducivetothegrowthofaquaticweedsoralgaetotheextentthat suchgrowthbecomeinimicaltomoredesirableformsofaquaticlife,orcreateconditions thatareunsightly,orconstituteanuisanceinanyotherfashion;

6.Inamountsthatwillimpairdesignatedinstreamordownstreamwateruses.

PARTVI.REOPENERCLAUSE

Ifthereisevidenceindicatingpotentialorrealizedimpactsonwaterqualityduetoany stormwaterdischargeassociatedwithconstructionactivitycoveredbythispermit,thepermittee ofsuchdischargemayberequiredtoobtaincoverageunderanindividualpermitoran alternativegeneralpermitinaccordancewithPartI.Cofthispermitorthepermitmaybe modifiedtoincludedifferentlimitationsand/orrequirements.

PermitmodificationorrevocationwillbeconductedaccordingtoORCChapter6111.

PARTVII.DEFINITIONS

A.meansCleanWaterAct(formerlyreferredtoastheFederalWaterPollution ControlActorFederalWaterPollutionControlActAmendmentsof1972)Pub.L.92500,asamendedPub.L.95-217,Pub.L.95-576,Pub.L.96-483,Pub.L.97-117and Pub.L.100-4,33U.S.C.1251et.seq.

B. meansachannelflowingatchannelcapacityandconveyingthe bankfulldischarge.Delineatedbythehighestwaterlevelthathasbeenmaintainedfora sufficientperiodoftimetoleaveevidenceonthelandscape,suchasthepointwherethe naturalvegetationchangesfrompredominantlyaquatictopredominantlyterrestrialor thepointatwhichtheclearlyscouredsubstrateofthestreamendsandterrestrial vegetationbegins.

C. meansthestreamflowthatfillsthemainchannelandjustbeginsto spillontothefloodplain;itisthedischargemosteffectiveatmovingsedimentand formingthechannel.

D. meansschedulesofactivities,prohibitionsof practices,maintenanceproceduresandothermanagementpractices(bothstructural andnon-structural)topreventorreducethepollutionofsurfacewatersofthestate. BMP'salsoincludetreatmentrequirements,operatingproceduresandpracticesto controlplantand/orconstructionsiterunoff,spillageorleaks,sludgeorwastedisposal ordrainagefromrawmaterialstorage.

E. meanstheintentionaldiversionofwastestreamsfromanyportionofa treatmentfacility.

F. meansthedefinitionsetforthinSection6111.01(M)oftheORC.

G. meanstheinitialdisturbanceofsoilsassociatedwith clearing,grubbing,grading,placementoffill,orexcavatingactivitiesorother constructionactivities.

H. meansanystormwaterrunoffwhichflowsthrougha drainagepipe,ditch,diversionorotherdiscreteconveyancechannel.

I. meansthedirectoroftheOhioEnvironmentalProtectionAgency.

J. meanstheadditionofanypollutanttothesurfacewatersofthestatefroma pointsource.

K. meansanyclearing,grading,excavating,filling,orotheralterationofland surfacewherenaturalorman-madecoverisdestroyedinamannerthatexposesthe underlyingsoils.

L. meansforpurposesofthispermitthetotalcontributingdrainage off-sitedrainage.

M. meansthateither:

1.Allsoildisturbingactivitiesatthesitearecompleteandauniformperennial vegetativecover(e.g.,evenlydistributed,withoutlargebareareas)withadensity ofatleast70percentcoverfortheareahasbeenestablishedonallunpaved areasandareasnotcoveredbypermanentstructuresorequivalentstabilization measures(suchastheuseofmulches,rip-rap,gabionsorgeotextiles)have beenemployed.Inaddition,alltemporaryerosionandsedimentcontrol practicesareremovedanddisposedofandalltrappedsedimentispermanently stabilizedtopreventfurthererosion;or

2.Forindividuallotsinresidentialconstructionbyeither:

a.Thehomebuildercompletingfinalstabilizationasspecifiedaboveor

b.Thehomebuilderestablishingtemporarystabilizationincludingperimeter controlsforanindividuallotpriortooccupationofthehomebythe homeownerandinformingthehomeowneroftheneedforandbenefitsof, finalstabilization.(Homeownerstypicallyhaveanincentivetoputinthe landscapingfunctionallyequivalenttofinalstabilizationasquickas possibletokeepmudoutoftheirhomesandoffsidewalksand driveways.);or

3.Forconstructionprojectsonlandusedforagriculturalpurposes(e.g.,pipelines acrosscroporrangeland),finalstabilizationmaybeaccomplishedbyreturning thedisturbedlandtoitspre-constructionagriculturaluse.Areasdisturbedthat werepreviouslyusedforagriculturalactivities,suchasbufferstripsimmediately adjacenttosurfacewatersofthestateandwhicharenotbeingreturnedtotheir pre-constructionagriculturaluse,mustmeetthefinalstabilizationcriteriain(1)or (2)above.

N. cforthepurposesofthispermit,theprimaryindividualorcompany solelyaccountabletoperformacontract.Thegeneralcontractortypicallysupervises activities,coordinatestheuseofsubcontractors,andisauthorizedtodirectworkersata sitetocarryoutactivitiesrequiredbythepermit.

O. lmeansaNoticeofIntentforanindividuallottobecoveredbythis permit(seePartIofthispermit).

P. -meansacontiguousareawheremultiple separateanddistinctconstructionactivitiesmaybetakingplaceatdifferenttimeson differentschedulesunderoneplan.

Q.meansmunicipalseparatestormsewersystemwhichmeansaconveyanceor systemofconveyances(includingroadswithdrainagesystems,municipalstreets,catch basins,curbs,gutters,ditches,man-madechannelsorstormdrains)thatare:

1.Ownedoroperatedbythefederalgovernment,state,municipality,township, county,district(s)orotherpublicbody(createdbyorpursuanttostateorfederal law)includingspecialdistrictunderstatelawsuchasasewerdistrict,flood controldistrictordrainagedistrictsorsimilarentityoradesignatedandapproved managementagencyundersection208oftheactthatdischargesintosurface watersofthestate;and

2.Designedorusedforcollectingorconveyingsolelystormwater,

3.Whichisnotacombinedsewerand

4.Whichisnotapartofapubliclyownedtreatmentworks.

R. meansthenationalprogram forissuing,modifying,revokingandreissuing,terminating,monitoringandenforcing permitsandenforcingpretreatmentrequirements,undersections307,402,318and405

S. channeldmeansanengineeringtechniquethatusesknowledgeofthe naturalprocessofastreamtocreateastablestreamthatwillmaintainitsformand functionovertime.

T.meansnoticeofintenttobecoveredbythispermit.

U.meansnoticeoftermination.

V. meansanypartyassociatedwithaconstructionprojectthatmeetseitherof thefollowingtwocriteria:

1.Thepartyhasday-to-dayoperationalcontrolofallactivitiesataprojectwhichare necessarytoensurecompliancewithaSWP3forthesiteandallpermit conditionsincludingtheabilitytoauthorizemodificationstotheSWP3, constructionplansandsitespecificationtoensurecompliancewiththeGeneral Permit,or

2.Propertyownermeetsthedefinitionofoperatorshouldthepartywhichhasdayto dayoperationalcontrolrequireadditionalauthorizationfromtheownerfor modificationstotheSWP3,constructionplans,and/orsitespecificationtoensure compliancewiththepermitorrefusestoacceptallresponsibilitiesaslistedabove (PartVII.V.1).

Subcontractorsgenerallyarenotconsideredoperatorsforthepurposesofthispermit. AssetforthinPartI.F.1,therecanbemorethanoneoperatoratasiteandunderthese circumstances,theoperatorsshallbeco-permittees.

W. meansthatlineontheshoreestablishedbythefluctuations ofwaterandindicatedbyphysicalcharacteristicssuchasclear,naturallineimpressed onthebank,shelving,changesinthecharacterofsoil,destructionofterrestrial vegetation,thepresenceoflitteranddebris,orotherappropriatemeansthatconsider thecharacteristicsofthesurroundingareas.

X. regulationundertheNPDESprogram.

Y. meanstheestablishmentofpermanentvegetation,decorative landscapemulching,matting,sod,riprapandlandscapingtechniquestoprovide permanenterosioncontrolonareaswhereconstructionoperationsarecompleteor wherenofurtherdisturbanceisexpectedforatleastoneyear.

Z. meanstheimperviousareacreateddividedbythetotalarea oftheprojectsite.

AA. meansanydiscernible,confinedanddiscreteconveyance,includingbut notlimitedto,anypipe,ditch,channel,tunnel,conduit,well,discretefissure,container, rollingstock,concentratedanimalfeedingoperation,landfillleachatecollectionsystem, vesselorthefloatingcraftfromwhichpollutantsareormaybedischarged.Thisterm doesnotincludereturnflowsfromirrigatedagricultureoragriculturalstormwaterrunoff.

BB. meansapersonknowledgeableintheprinciplesand practiceoferosionandsedimentcontrols,whopossessestheskillstoassessall conditionsattheconstructionsitethatcouldimpactstormwaterqualityandtoassess

theeffectivenessofanysedimentanderosioncontrolmeasuresselectedtocontrolthe qualityofstormwaterdischargesfromtheconstructionactivity.

CC. isamanualdescribingconstructionandpostconstructionbestmanagementpracticesandassociatedspecifications.Acopyofthe manualismaintainedontheOhioEPAwebsite.

DD. meansthetransitionareabetweenflowingwaterandterrestrial(land) ecosystemscomposedoftrees,shrubsandsurroundingvegetationwhichserveto stabilizeerodiblesoil,improvebothsurfaceandgroundwaterquality,increasestream shadingandenhancewildlifehabitat.

EE. meansthefractionoftotalrainfallthatwillappearattheconveyance asrunoff.

FF. meansasedimenttrap,sedimentbasinorpermanentbasin thathasbeentemporarilymodifiedforsedimentcontrol,asdescribedinthelatestedition oftheRainwaterandLandDevelopmentmanual.

GG. meanstherequirementssetforthin Sections6111.02through6111.029oftheORC.

HH. meansstormwaterrunoff,snowmeltandsurfacerunoffanddrainage.

II. meansslopesthatare15percentorgreateringrade.Wherealocal slope,this

JJ. meanstheordinaryhighwatermark.

KK. forthepurposesofthispermit,anindividualorcompanythattakesa portionofacontractfromthegeneralcontractororfromanothersubcontractor.

LL. meansallstreams,lakes,reservoirs, ponds,marshes,wetlandsorotherwaterwayswhicharesituatedwhollyorpartially withintheboundariesofthestate,exceptthoseprivatewaterswhichdonotcombineor effectajunctionwithnaturalsurfaceorundergroundwaters.Watersdefinedas seweragesystems,treatmentworksordisposalsystemsinSection6111.01oftheORC arenotincluded.

MM.meansstormwaterpollutionpreventionplan.

NN.meansanexceptionalincidentinwhichthereisunintentionalandtemporary noncompliancewithtechnologybasedpermiteffluentlimitationsbecauseoffactors beyondthereasonablecontrolofthepermittee.Anupsetdoesnotinclude noncompliancetotheextentcausedbyoperationalerror,improperlydesignedtreatment facilities,inadequatetreatmentfacilities,lackofpreventivemaintenance,orcarelessor improperoperation.

OO. meanstheestablishmentoftemporaryvegetation,mulching, geotextiles,sod,preservationofexistingvegetationandothertechniquescapableof quicklyestablishingcoveroverdisturbedareastoprovideerosioncontrolbetween constructionoperations.

PP. vmeansthevolumeofstormwaterrunoffwhichmustbe capturedandtreatedpriortodischargefromthedevelopedsiteafterconstructionis complete.

APPENDICES

AppendixA

A.BigDarbyCreekWatershed CONTENTSOFTHISAPPENDIX

A.1PermitArea

A.2TMDLConditions

A.3SedimentSettlingPondsandSampling

A.4Post-ConstructionStormwaterManagementSelection

A.5RiparianSetbackRequirements

A.6RiparianSetbackMitigation

A.7GroundwaterRechargeRequirements

A.8GroundwaterRechargemitigation

AttachmentA-A:BigDarbyCreekWatershedMap

AttachmentA-B:StreamAssessmentandRestoration

A.1PermitArea.

ThisappendixtoPermitOHC00006appliestotheentireBigDarbyCreekWatershed locatedwithintheStateofOhio.PleaseseeAttachmentAforpermitareaboundaries.

A.2TMDLConditions.

Thisgeneralpermitrequirescontrolmeasures/BMPsforconstructionsitesthatreflect recommendationssetforthintheU.S.EPAapprovedBigDarbyCreekTMDL.

A.3SedimentSettlingPondsandSampling

Sedimentsettlingpondsadditionalconditions.Thesedimentsettlingpondshallbesized toprovideaminimumdewateringvolumeof134cubicyardsperacreofdrainagearea andmaintainatargetdischargeperformancestandardof45mg/lTotalSuspendedSolids (TSS)or50NephelometricTurbidityUnits(NTUs)uptoa0.75-inchrainfalleventwithina 24-hourperiod.Unlessinfeasible,sedimentsettlingpondsmustbedewateredatthepond surfaceusingaskimmerorequivalentdevice.Thedepthofthesedimentsettlingpond mustbelessthanorequaltofivefeet.Sedimentmustberemovedfromthesediment settlingpondwhenthedesigncapacityhasbeenreducedby40percent(Thisistypically reachedwhensedimentoccupiesone-halfofthebasindepth).

SiltFenceandDiversions.Forsitesfiveormoreacresinsize,theuseofsedimentbarriers asaprimarysedimentcontrolisprohibited.Centralizedsedimentbasinsshallbeused forsites5ormoreacresinsize.Diversionsshalldirectallstormwaterrunofffromthe disturbedareastotheimpoundmentintendedforsedimentcontrol.Thesedimentbasins andassociateddiversionsshallbeimplementedpriortothemajorearthdisturbingactivity.

Thepermitteeshallsampleinaccordancewithsamplingproceduresoutlinedin40CFR 136.Samplingshalloccurasfollows:

i.Occurattheoutfallofeachsedimentsettlingpondassociatedwiththesite.Each associatedoutfallshallbeidentifiedbyathree-digitnumber(001,002,etc.);

ii.Theapplicablerainfalleventforsamplingtooccurshallbearainfalleventof0.25inchtoa0.75-inchrainfalleventtooccurwithina24-hourperiod.Grabsampling shallbeinitiatedatasitewithin14days,orthefirstapplicablerainfallevent thereafter,onceupslopedisturbanceofeachsamplinglocationisinitiatedand shallcontinueonaquarterlybasis.Quarterlyperiodsshallberepresentedas January-March,April-June,July-SeptemberandOctober-December. Samplingresultsshallberetainedonsiteandavailableforinspection.

Ifanysampleisgreaterthantheperformancestandardof45mg/lTSSor 50NTUs,thepermitteeshallmodifytheSWP3andinstall/implementnew controlpractice(s)within10daystoensuretheperformancestandardis maintained.Within3daysofimprovement(s),orthefirstapplicablerainfall eventthereafter,thepermitteeshallresampletoensureSWP3 modificationsmaintaintheperformancestandardtarget.

Foreachsampletaken,thepermitteeshallrecordthefollowinginformation: theoutfallanddateofsampling; theperson(s)whoperformedthesampling; thedatetheanalyseswereperformedonthosesamples; theperson(s)whoperformedtheanalyses; theanalyticaltechniquesormethodsused;and theresultsofallanalyses.

Bothquarterlyandsamplingresultsfollowingadischargetarget exceedanceshallberetainedonsiteandavailableforinspection.

A.4Post-ConstructionStormwaterManagementSelection.

Forallconstructionactivitiesauthorizedunderthispermitthatfallwithinthewatershedof theBigDarbyCreek,aTable4bpracticeshallbeusedtotreatstormwaterrunofffor pollutants,toreduceadverseimpactsonreceivingwaters,andtofurthersupport groundwaterrechargeiffeasible.TheapplicantmustprovideajustificationintheSWP3 whytheuseoftable4bpracticesarenotfeasible.Thejustificationmustaddresslimiting factorswhichwouldprohibittheprojectgoingforwardshouldTable4bpracticesbe required.Pleasenotethatpracticesselectedwillrequireapprovalfromtheregulated MS4.

A.5RiparianSetbackRequirements.

TheSWP3shallclearlydelineatetheboundaryofrequiredstreamsetbackdistances. Noconstructionactivityshalloccur,withoutappropriatemitigation,withinthedelineated setbackboundaryexceptactivitiesassociatedwithrestorationorrecoveryofnatural floodplainandchannelformcharacteristicsasdescribedinAttachmentB,stormwater conveyancesfrompermanenttreatmentpracticesandapprovableutilitycrossings. Suchconveyancesmustbedesignedtominimizethewidthofdisturbance.Ifintrusion withinthedelineatedsetbackboundaryisnecessarytoaccomplishthepurposesofa project,thenmitigationshallberequiredinaccordancewithAppendixA.6ofthispermit. Streamsrequiringprotectionunderthissectionaredefinedasperennial,intermittentor jurisdictionalephemeralstreamswithadefinedbed,bankorchannel.National ResourcesConservationService(NRCS)soilsurveymapsshouldbeusedasone

referenceandthepresenceofastreamrequiringprotectionshouldalsobeconfirmedin thefield.Anyrequiredsetbackdistancesshallbeclearlydisplayedinthefieldpriorto anyconstructionrelatedactivity.

Ripariansetbacksdistanceshallbedelineatedbasedupononeofthefollowingtwo methods:

i.Thesetbackdistanceshallbesizedasthegreaterofthefollowing:

1.Theregulatory100-yearfloodplainbasedonFEMAmapping;

2.Aminimumof100feetfromthetopofthestreambankoneach side;or

3.Adistancecalculatedusingthefollowingequation:

W=133DA0.43 (Equation1,AppendixA)

where:

DA=drainagearea(mi2)

W=totalwidthofripariansetback(ft)

Wshallbecenteredoverthemeanderpatternofthestreamsuchthata linerepresentingthesetbackwidthwouldevenlyintersectequalelevation linesoneithersideofthestream.

IftheDAremainsrelativelyconstantthroughoutthestretchofinterest, thentheDAofthedownstreamedgeofthestretchshouldbeused. WherethereisasignificantincreaseintheDAfromtheupstreamedgeto Thedownstreamedgeoftheareaofinterest,thesetbackwidthshall increaseaccordingly.

ii.StreamRestorationwith100feet(eachside)RiparianSetback.Each streamsegmentwithintheproposedsiteboundariescanbeassessedin accordancewithAttachmentB,Part1.Intheeventthestreamsegment

thepermitteehastheoptiontorestorethestreamsegmentinaccordance withAttachmentBandincludea100-footwaterqualitysetbackdistance fromthetopofthestreambankoneachside.Intheeventthestream segmentexceedstheminimumcriteriainAttachmentBtobeclassifiedas Appendix A,AttachmentBmaybeconsideredonacase-by-casebasis.

Nostructuralsedimentcontrols(e.g.,theinstallationofsedimentbarriersorasediment settlingpond)orstructuralpost-constructioncontrolsshallbeusedinasurfacewaterof theStateorthedelineatedsetbackcorridor.

Previouslydevelopedprojects(asdefinedinPartIII.G.2.e.)locatedwithinthedelineated setbackboundaryareexemptfromRiparianSetbackMitigation(A.6)providedthe proposedprojectdoesnotfurtherintrudeintothedelineatedsetbackboundary.

Lineartransportationprojectswhicharecausedsolelybycorrectingsafetyrelated issues,mandatesofmoderndesignrequirementsand/orresultingfromothermitigation activitiesareexemptfromRiparianSetbackMitigation(AppendixA,A.6)iflessthanone acreoftotalnewright-of-wayisassociatedwiththeproject.A.6RiparianSetback Mitigation.

Themitigationrequiredforintrusionintotheripariansetbackshallbedeterminedbythe horizontaldistancetheintrusionisfromthestream.Uptothreezoneswillbeusedin determiningtherequiredmitigation.Zone1extendsfrom0to25feetfromthestream edge.Zone2extendsfrom25to100feetfromthestreamedge,andZone3extends from100feettotheouteredgeofthesetbackcorridor.Intrusionintothesezoneswill requirethefollowingmitigationwithinthesameWatershedAssessmentUnit(12-digit HUCscale):

i.FourtimesthetotalareadisturbedinthestreamandwithinZone1ofthe sitebeingdevelopedshallbemitigatedwithinZone1ofthemitigation location.

ii.ThreetimestheareadisturbedwithinZone2ofthesitebeingdeveloped shallbemitigatedwithinZones1and/or2ofthemitigationlocation.

iii.TwotimestheareadisturbedwithinZone3ofthesitebeingdeveloped shallbemitigatedwithinanyzoneofthemitigationlocation.

Inlieuofmitigationratiosfoundwithininthissection,lineartransportationprojectswhich resultintotalnewright-of-waygreaterthanoneacreandlessthantwoacres,whichare causedsolelybycorrectingsafetyrelatedissues,mandatesofmoderndesign requirementsand/orresultingfromothermitigationactivities,shallprovideRiparian SetbackMitigationataratioof1.5to1.

Allmitigationshall,ataminimum,includeconservedorrestoredsetbackzoneand shouldbedesignedtomaximizetheecologicalfunctionofthemitigation.Including mitigationatthestreamedgealongwithassociatedsetbackareasisonewayto maximizeecologicalfunction.Mitigationshallbeprotectedinperpetuitybybinding conservationeasementsorenvironmentalcovenantswhichmustberecordedwithin6 monthsofreceivingpermitauthorization.Grantingofbindingconservationeasementsor environmentalcovenantsprotectedinperpetuityforlandoutsideofdisturbedareabut withinarequiredripariansetbackcountstowardsrequiredmitigation.

Mitigationmayalsobesatisfiedbyapprovedpooledmitigationareasandin-lieufee sponsoredmitigationareas.MitigationresultingfromStateorFederalenvironmental regulationsmaybeadjustedinrecognitionoftheserequirements.

TheSWP3shallensurethattheoverallsitepost-developmentgroundwaterrecharge equalsorexceedsthepre-developmentgroundwaterrecharge.TheSWP3shall describetheconservationdevelopmentstrategies,BMPsandotherpracticesdeemed necessarybythepermitteetomaintainorimprovepre-developmentratesof

groundwaterrecharge.Pre-developmentandpost-developmentgroundwaterrecharge shallbecalculatedusingthefollowingequation:

i.Vrex=Ax*Drex/12 (Equation2,AppendixA)

where:

X=representsalanduseandhydrologicsoilgrouppair

Vrex=volumeoftotalannualrechargefromlanduse-soilgroupX (inacre-ft)

Drex=depthoftotalannualrechargeassociatedwithlanduse-soil groupXfromTables1or2(ininches)

Ax=areaoflanduse-soilgroupX(inacres)

TableA-1valuesshouldbeusedforlandwheretheunderlyinggeologyindicatesa potentialfordownwardmigrationofgroundwater.TableA-1valuesrepresentthe combinedtotalgroundwaterrechargepotentialincludinggroundwatercontributionto streambaseflowandtotheunderlyingbedrockaquifer.Thepotentialfordownward migrationcanbedeterminedfromacomparisonofthepotentiometricmapsforthe glacialandbedrockaquifers.UseTableA-2whenthispotentialisunlikelytoexist.See attachmentBforamapofTableA-1andA-2areas.Detailedpotentiometricmapsfor theFranklincountyportionoftheDarbywatershed,andcoarsepotentiometricmapsfor theDarbywatershedoutsideofFranklinCountyandhydrologicsoilgroupdataare availableat: https://epa.ohio.gov/divisions-and-offices/surface-water/permitting/stormwaterprogram

1DU=DwellingUnits

2HydrologicsoilgroupdesignationsofA/D,B/D,andC/DshouldbeconsideredasDsoilsforthis application.

3Thesevaluesapplywhenrechargeoftheaquiferisexpected;rechargetothebedrockaquifercanbe expectedwhenthepotentiometricheadoftheglacialaquiferisgreaterthanthebedrockaquifer.

4).Thesevaluesmaybeusedwheretotalperviousandimperviousareaswithinthedevelopmentare tabulatedseparately..

5Thesevaluesmayonlybeusedforanareaasawhole(includesimperviousandperviousareas).

TableA-2(AppendixA)AnnualAverageExpectedBaseflowRecharge3

1DU=DwellingUnits

2HydrologicsoilgroupdesignationsofA/D,B/D,andC/DshouldbeconsideredasDsoilsforthis application.

3Thesevaluesapplywhennorechargeoftheaquiferisexpected.

4Thesevaluesmaybeusedwheretotalimperviousandperviousareasaretabulatedseparately.

5Thesevaluesmayonlybeusedforanareaasawhole(includesimperviousandperviousareas).

TableA-3(AppendixA)LandUseDefinitions

LandUseDefinition

Woods/ForestAreasdominatedbytrees.Woodsareprotectedfromgrazingandlitterand brushadequatelycoverthesoil.

Brush Brush,weeds,grassmixturewherebrushisthemajorelementandmorethan 75%ofthegroundiscovered.

Meadow Continuousgrass,protectedfromgrazing,generallymowedforhay.

ManagedWoodOrchards,treefarms,andotherareasplantedormaintainedfortheproduction offruits,nuts,berries,orornamentals.

Pasture Pasture,grassland,orrangewhereatleast50%ofthegroundiscoveredand theareaisnotheavilygrazed.

RowCropAreasusedtoproducecrops,suchascorn,soybeans,vegetables,tobacco, andcotton.

UrbanGrassesVegetation(primarilygrasses)plantedindevelopedsettingsforrecreation, erosioncontrol,oraestheticpurposes.Examplesincludeparks,lawns,golf courses,airportgrasses,andindustrialsitegrasses.

ResidentialAreaswithamixtureofconstructedmaterialsandvegetation;theaverage% imperviousnessandnumberofdwellingunitsperacretodeterminethe appropriatedensityisspecified.

CommercialIncludesinfrastructure(e.g.roads,railroads,etc.)andallhighlydeveloped areasnotclassifiedasHighIntensityResidential.

ii.Thepre-developmentgroundwaterrechargevolumeshallbecalculated bydeterminingtheareaofeachlanduse-soiltypepairingonthesiteof interest.Therechargeassociatedwitheachsuchpairingmultipliedby theareawillgivethepre-developmentvolumeoftotalgroundwater recharge.Thesameshallbedoneforthepost-developmentlanduse-soil typepairings.

Anyactivitythatisexpectedtoproducestormwaterrunoffwithelevated concentrationsofcarcinogens,hydrocarbons,metals,ortoxicsisprohibitedfrom infiltratinguntreatedstormwaterfromtheareaaffectedbytheactivity.The groundwaterrechargemitigationrequirementforareasaffectedbysuchactivities mustbemetbymethodswhichdonotpresentariskofgroundwater contamination.Thefollowinglandusesandactivitiesaretypicallydeemed stormwaterhotspots:

Vehiclesalvageyardsandrecyclingfacilities

vehicleserviceandmaintenancefacilities(i.e.truckstops,gasstations) fleetstorageareas(i.e.bus,truck) industrialsitessubjecttoindustrialstormwaterpermittingrequirements bulkterminals marinas facilitiesthatgenerateorstorehazardousmaterials otherlandusesandactivitiesasdesignatedbyindividualreview

Thefollowinglandusesandactivitiesarenotnormallyconsideredhotspots: residentialstreetsandruralhighways residentialdevelopment institutionaldevelopment commercialandofficedevelopments non-industrialrooftops perviousareas,exceptgolfcoursesandnurseries

TheapplicantmayusestructuralBMPswithindrinkingwatersourceprotection areasforcommunitypublicwatersystemsonlytotheextentthatthestructural BMP(s)doesnotcausecontaminantsintherechargewaterstoimpactthe groundwaterqualityatlevelsthatwouldcauseanexceedanceofthedrinking waterMaximumContaminantLevels(OACSection3745-81and3745-82).To obtainamapofdrinkingwatersourceprotectionareasforcommunitypublic (614)644-2752.

Lineartransportationprojectswhicharecausedsolelybycorrectingsafetyrelated issues,mandatesofmoderndesignrequirementsand/orresultingfromother mitigationactivitiesareexemptfromGroundwaterRechargeMitigation(Appendix B,A.8)iflessthanoneacreoftotalnewright-of-wayisassociatedwiththeproject.

Protectionofopenspace(infiltrationareas)shallbebybindingconservation easementsthatidentifyathird-partymanagementagency,suchasa

partylandtrust.

A.8GroundwaterRechargeMitigation.

Ifthepost-developmentrechargevolumeislessthanthepre-developmentrecharge volume,thenmitigationwillberequired.Twooptionsareavailableformostapplications:

i.Thepreferredmethodistoconvertadditionallandtolandusewithhigher rechargepotential.Thedifferenceingroundwaterrechargebetweenthe existingandconvertedlanduserechargeistheamountwhichcanbe usedasrechargecredit.Off-siteGroundwaterRechargeMitigationshall occurwithinthesameWatershedAssessmentUnit(12-digitHUCscale) asthepermittedsiteandpreferablyup-gradientandwithina2-mile radius.

Mitigationshallbeprotectedinperpetuitybybindingconservation easementsorenvironmentalcovenantswhichmustberecordedwithin6 monthsofreceivingpermitauthorization.Grantingofbinding conservationeasementsorenvironmentalcovenantsprotectedin perpetuityforlandoutsideofthedisturbedarea,butwithinarequired ripariansetbackcountstowardsrequiredmitigation.Mitigationmayalso besatisfiedbyapprovedpooledmitigationareasandin-lieufee sponsoredmitigationareas.

ii.On-sitestructuralandnon-structuralpracticesmayalsobeusedto achievegroundwatermitigationrequirementsbyretainingandinfiltrating on-siteaminimumvolumeofstormwaterrunoffbasedontheareaand hydrologicsoilgroupsofdisturbedsoils.Iftheseinfiltratingpracticesare incorporatedupstreamofthewaterqualityvolumetreatmentpractice,the volumeofgroundwaterbeinginfiltratedmaybesubtractedfromthewater qualityvolumeforthepurposeofmeetingpost-constructionrequirements. Theon-siteretentionrequirementisdeterminedbythefollowingformula:

Vretention=AHSG-A*0.90in+AHSG-B*0.75in+AHSG-C*0.50in+AHSG-D*0.25in (Equation3,AppendixA) Where, Vretention=volumeofrunoffretainedonsiteusinganapprovedinfiltrationpractice AHSG-x=areaofeachhydrologicsoilgroupwithinthedisturbedarea

TableA-4:HydrologicSoilGroupsandOn-siteRetentionDepthperAcre

Retentionvolume(Vretention)providedbyselectedpracticesshallbedetermined usingtherunoffreductionmethodcriteriaasoutlinedinPartIII.G.2.e RunoffReductionspreadsheetandsupportingdocumentationintheRainwater andLandDevelopmentmanual.Hydrologicsoilgroup(HSG)areasaretobe determinedbyusingthecurrentversionofSURRGOorWebSoilSurveysoils information.

Amoredetailedmapcanbeviewedat: https://epa.ohio.gov/divisions-and-offices/surface-water/permitting/stormwater-program

AppendixAAttachmentB:GroundwaterRechargeAreas

Amoredetailedmapcanbeviewedat: https://epa.ohio.gov/divisions-and-offices/surface-water/permitting/stormwater-program

Part1StreamAssessment

Thisassessmentwilldetermineifastreamisconsideredapreviouslychannelized,low-gradient headwaterstream(adrainageditchmaybeanaturalstreamthathasbeenchannelizedand canberestored)whichwouldbeapplicableforstreamrestorationinlieuofprotectingasetback asperAppendixA.A.5.iandii.

Intheeventtheassessmentofthestream,meetsallthecriterialistedbelow,restoration(provided 401/404permitsareauthorized)asdepictedinPart2ofthisattachment,maybeameansof reducingthesetbackdistancerequiredbyA.5.i.(AppendixA).

PreviouslyChannelizedLow-GradientHeadwaterStreams,shallforthepurposesofthispermit, bedefinedashavingallofthefollowingcharacteristics:

Lessthan10squaremilesofdrainagearea

Lowgradientandlowstreampowersuchthatdespitetheirstraightenedandentrenched conditionincision(down-cutting)isnotevident Entrenched,entrenchmentratio<2.2

Straight,sinuosityofthebankfullchannel<1.02

Part2Restoration

Restorationshallbeaccomplishedbyanynaturalchanneldesignapproachthatwillleadtoaselfmaintainingreachabletoprovidebothlocalhabitatandwatershedservices(e.g.self-purification andvalleyfloodwaterstorage).

a.Constructionofafloodplain,channelandhabitatvianaturalchanneldesign;

b.Floodplainexcavationnecessarytopromoteinteractionbetweenstreamandfloodplain;

c.Includeawaterqualitysetbackof100feetfromtopofthestreambankoneachside.

Theprimarytargetregardlessofdesignapproachshallbethefrequentlyfloodedwidth,which -formingwidth.Fivetimestheself-forming channelwidthmaystillbeacceptableparticularlyonportionsofthesiteifgreaterwidthsare achievedelsewhere.

AppendixB

B.OlentangyRiverWatershed CONTENTSOFTHISAPPENDIX

B.1PermitArea

B.2TMDLConditions

B.3RiparianSetbackRequirements

B.4RiparianSetbackMitigation

AttachmentB-A:AreaofApplicabilityfortheOlentangyWatershed(Map)

AttachmentB-B:StreamAssessmentandRestoration

B.1PermitArea.

ThisappendixtoPermitOHC00006appliestospecificportionsoftheOlentangyRiver WatershedlocatedwithintheStateofOhio.Thepermitareaincludesthefollowing12-digit HydrologicUnitCodes(HUC-12)withintheOlentangyRiverWatershed:

AttachmentA)

PleaseseeAttachmentA(AppendixB)forpermitareaboundaries.Anelectronicversionof AttachmentAcanbeviewedathttps://epa.ohio.gov/divisions-and-offices/surfacewater/permitting/stormwater-program

B.2TMDLConditions.

Thisgeneralpermitrequirescontrolmeasures/BMPsforconstructionsitesthatreflect recommendationssetforthintheU.S.EPAapprovedOlentangyTMDL.

B.3RiparianSetbackRequirements.

Thepermitteeshallcomplywiththeripariansetbackrequirementsofthispermitor alternativeripariansetbackrequirementsestablishedbyaregulatedMS4andapproved byOhioEPA.TheSWP3shallclearlydelineatetheboundaryofrequiredstream setbackdistances.Thestreamsetbackshallconsistofastreamsidebufferandanouter buffer.Noconstructionactivityshalloccur,withoutappropriatemitigation,withinthe streamsidebufferexceptactivitiesassociatedwithstormwaterconveyancesfrom permanenttreatmentpractices,approvableutilitycrossingsandrestorationorrecovery offloodplainandchannelformcharacteristicsasdescribedinAttachmentB. Stormwaterconveyancesmustbedesignedtominimizethewidthofdisturbance. Constructionactivitiesrequiringmitigationforintrusionswithintheouterbufferforthe OlentangyRivermainstemandperennialstreamsaredescribedinAppendixB.4.

Ifintrusionwithinthedelineatedsetbackboundaryisnecessarytoaccomplishthe purposesofaproject,thenmitigationshallberequiredinaccordancewithAppendixB.3. ofthispermit.Streamsrequiringprotectionunderthissectionhaveadefinedbedand bankorchannelandaredefinedasfollows:

TheOlentangyRivermainstem;

Perennialstreamshavecontinuousflowoneitherthesurfaceofthestream bedorunderthesurfaceofthestreambed; Intermittentstreamsflowforextendedperiodsoftimeseasonallyofatypical climateyear;and

JurisdictionalEphemeralstreamsarenormallydryandonlyflowduringand afterprecipitationrunoff(episodicflow).

NationalResourcesConservationService(NRCS)soilsurveymapsshouldbeusedas onereferenceandthepresenceofastreamrequiringprotectionshouldalsobe confirmedinthefield.Anyrequiredsetbackdistancesshallbeclearlydisplayedinthe fieldpriortoanyconstructionrelatedactivity.

Ripariansetbacksshallbedelineatedbasedupononeofthefollowingtwomethods:

i.Therequiredsetbackdistancesshallvarywithstreamtypeasfollows:

a.ThesetbackdistancesassociatedwiththemainstemoftheOlentangy Rivershallconsistof:

(1)Astreamsidebufferwidthof100feetasmeasuredhorizontallyfrom theordinaryhighwatermarkperside;and

(2)Anouterbufferwidthsizedtotheregulatory100-yearfloodplainbased onFEMAmapping.Noimpervioussurfacesshallbeconstructed withoutappropriatemitigationandmoderatetosubstantialfillactivities withnoimpervioussurfacemayrequireappropriatemitigation pendinganindividualapprovalbyOhioEPA.

b.Thesetbackdistanceassociatedwithperennialstreams,otherthanthe Olentangymainstem,shallconsistof:

(1)Astreamsidebufferwidthof80feetpersidemeasuredhorizontally fromtheordinaryhighwatermark;and

(2)Anouterbufferwidthsizedtotheregulatory100-yearfloodplain basedonFEMAmapping.Intheeventtheregulatory100-year floodplainisnotestablished,theouterbufferwidthshallbecalculated usingthefollowingequationandmeasuredhorizontallyfromthe ordinaryhighwatermark.Noimpervioussurfaces,structure,fill,or activitythatwouldimpairthefloodplainorstreamstabilizingabilityof theouterbuffershalloccurwithoutappropriatemitigation:

W=143DA0.41 (Equation1AppendixB)

where:

DA=drainagearea(mi2)

W=totalwidthofripariansetback(ft)

Wshallbecenteredoverthemeanderpatternofthestreamsuchthata linerepresentingthesetbackwidthwouldevenlyintersectequalelevation linesoneithersideofthestream.

IftheDAremainsrelativelyconstantthroughoutthestretchofinterest, thentheDAofthedownstreamedgeofthestretchshouldbeused. WherethereisasignificantincreaseintheDAfromtheupstreamedgeto thedownstreamedgeoftheareaofinterest,thesetbackwidthshall increaseaccordingly.

c.Thesetbackdistanceassociatedwithintermittentstreamsand jurisdictionalephemeralstreamsshallbeastreamsidebufferwidthof30 feetpersidemeasuredhorizontallyfromthecenterlineofthestream.No outerbufferisrequiredforintermittentandephemeralstreams.

ii.StreamRestorationwith100feet(eachside)RiparianSetback.Eachstream segmentwithintheproposedsiteboundariescanbeassessedinaccordance withAttachmentB.Intheeventthestreamsegmentisclassifiedasa optiontorestorethestreamsegmentinaccordancewithAttachmentBand includea100feetwaterqualitysetbackdistancefromthetopofthe streambankoneachside.Intheeventthestreamsegmentexceedsthe -by-case basis.

Nostructuralsedimentcontrols(e.g.,theinstallationofsedimentbarriersorasediment settlingpond)orstructuralpost-constructioncontrolsshallbeusedinastreamorthe streamsidebuffer.Activitiesandcontrolsthatwouldnotimpairthefloodplainorstream stabilizingabilityoftheouterbuffercanbeconsidered.

Redevelopmentprojects(i.e.,developmentsonpreviouslydevelopedproperty)located withinthedelineatedsetbackboundaryisexemptfromRiparianSetbackMitigation(B.3) providedtheproposedprojectdoesnotfurtherintrudethedelineatedsetbackboundary.

B.4RiparianSetbackMitigation.

ThemitigationrequiredforintrusionintotheripariansetbackoftheOlentangyRiver mainstemorperennialstreamsshallbedeterminedbythehorizontaldistancethe intrusionisfromthestream.Uptothreezoneswillbeusedindeterminingtherequired mitigation.Zone1extendsfrom0to30feetfromthestreamedge.Zone2extends from30feettotheouteredgeofthestreamsidebuffer.Zone3extendsfromtheouter edgeofthestreamsidebuffertotheouteredgeoftheouterbuffer.Intrusionintothese zoneswillrequirethefollowingmitigationwithinthesameWatershedAssessmentUnit

(12-digitHUCscale).Alternativemitigation,withinthepermitarea,maybeconsidered onacase-by-casebasis:

1.Four(4)timesthetotalareadisturbedinthestreamwithinZone1ofthesite beingdevelopedshallbemitigated;or,two(2)timesthetotalareadisturbed inthestreamwithinZone1shallbemitigatedwithinthewatershedofthe immediatereceivingstream,andtheentirerequiredsetbackofthesiteshall beprotectedbybindingconservationeasementsorenvironmentalcovenants.

2.Three(3)timestheareadisturbedwithinZone2ofthesitebeingdeveloped shallbemitigatedwithinZones1and/or2ofthemitigationlocation;or,one andone-half(1.5)timesthetotalareadisturbedwithinZone2shallbe mitigatedwithinthewatershedoftheimmediatereceivingstream,andthe entirerequiredsetbackofthesiteshallbeprotectedinperpetuitybybinding conservationeasementsorenvironmentalcovenants.

3.Two(2)timestheareatobemitigatedwithinZone3ofthesitebeing developedshallbemitigatedwithinanyZoneofthemitigationlocation;or, one(1)timesthetotalareatobemitigatedwithinanyzoneshallbemitigated withinthewatershedoftheimmediatereceivingstream,andtheentire requiredsetbackofthesiteshallbeprotectedinperpetuitybybinding conservationeasementsorenvironmentalcovenants.

Themitigationrequiredforintrusionintotheripariansetbackofanintermittentstream shallbefour(4)timesthetotalareadisturbedwithintheripariansetbackofthesite beingdevelopedshallbemitigated;ortwo(2)timesthetotalareadisturbedwithinthe ripariansetbackshallbemitigatedwithinthewatershedoftheimmediatereceiving stream,andtheentirerequiredsetbackofthesiteshallbeprotectedinperpetuityby bindingconservationeasementsorenvironmentalcovenants.

Themitigationrequiredforintrusionintothestreamsidebufferofajurisdictional ephemeralstreamshallbetwo(2)timesthetotalareadisturbedwithintheriparian setbackofthesitebeingdevelopedshallbemitigated;orone(1)timesthetotalarea disturbedwithintheripariansetbackshallbemitigatedwithinthewatershedofthe immediatereceivingstream,andtheentirerequiredsetbackofthesiteshallbe protectedinperpetuitybybindingconservationeasementsorenvironmentalcovenants.

Allmitigationshall,ataminimum,includeconservedorrestoredsetbackzone,and shouldbedesignedtomaximizetheecologicalfunctionofthemitigation.Including mitigationatthestreamedgealongwithassociatedsetbackareasisonewayto maximizeecologicalfunction.Mitigationshallbeprotectedinperpetuitybybinding conservationeasementsorenvironmentalcovenantswhichmustberecordedwithin6 monthsofpermitauthorization.Grantingofbindingconservationeasementsor environmentalcovenantsprotectedforlandoutsideofdisturbedarea,butwithina requiredripariansetbackcountstowardsrequiredmitigation.

Mitigationmayalsobesatisfiedbyapprovedpooledmitigationareasandin-lieufee sponsoredmitigationareas.MitigationresultingfromStateorFederalenvironmental regulationsmaybeadjustedinrecognitionoftheserequirements.

AppendixBAttachmentAApplicablePortionsoftheOlentangyWatershed

Amoredetailedmapcanbeviewedat: https://epa.ohio.gov/divisions-and-offices/surface-water/permitting/stormwater-program

AppendixBAttachmentB

Part1StreamAssessment

Thisassessmentwilldetermineifastreamisconsideredapreviouslychannelized,low-gradient headwaterstream(adrainageditchmaybeanaturalstreamthathasbeenchannelizedand canberestored)whichwouldbeapplicableforstreamrestorationinlieuofprotectinganouter B.2i.andii.

Intheeventtheassessmentofthestreammeetsallthecriterialistedbelow,restorationas depictedinPart2ofthisattachmentornaturalchanneldesigncouldbeperformed,provided 401/404permitsareauthorized,andmaybeameansofreducingthesetbackdistancerequired byB.2.i.(AppendixB).

PreviouslyModified,Low-GradientHeadwaterStreamsshall,forthepurposesofthispermit,be definedashavingallofthefollowingcharacteristics:

Lessthan10squaremilesofdrainagearea; Lowgradientandlowstreampowersuchthatincision(down-cutting)isnotevident; Entrenchedsuchthattheratioofthefrequentlyfloodedwidthtothebankfullwidthisless than2.2;and

Straightwithlittleornosinuositypresentsuchthattheratioofthebankfullchannel lengthtothestraight-linedistancebetweentwopointsislessthan1.02.

Part2Restoration

Restorationshallbeaccomplishedbyanynaturalchanneldesignapproachthatwillleadtoa self-maintainingreachabletoprovidebothlocalhabitatandwatershedservices(e.g.selfpurificationandvalleyfloodwaterstorage).

a.Constructionofafloodplain,channelandhabitatvianaturalchanneldesign;

b.Floodplainexcavationnecessarytopromoteinteractionbetweenstreamandfloodplain; c.Includeawaterqualitysetbackof100feetfromtopofthestreambankoneachside.

-forming

width.Fivetimestheself-formingchannelwidthmaybeacceptableifsufficientelementsof naturalchanneldesignareincludedintherestorationproject.

Note:Fortc<5minutes,usei=2.37in/hr;fortc>60minutes,usei=0.62in/hr.Forallothertc, usetheappropriatevaluefromthistable.