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 _ 02 02  8XXdd8  _ ModelPostConstructionStormwaterRunoffControlOrdinancec*XXXXThismodelordinanceisintendedtobeatoolforcommunitieswhoarecurrentlyormaysoonbe  responsibleformeetingthestormwatermanagementrequirementsoftheNationalPollutantDischargeEliminationSystem(NPDES)regulations.Thegoalofprovidingthismodelordinanceis#XXX*X#Ԁtoassistcommunitiesincreatingtheirownstormwatermanagementordinance.In   designingamodelstormwaterordinanceforanationalaudience,wepurposelyavoidedcreatingtoocomplexanordinance,andinsteadtriedtoincludesuggestionsforstandardlanguageandconceptsthatwebelieveagoodstormwatermanagementordinanceshouldcontain.Thisordinanceshouldnotbeconstruedasanexhaustivelistingofallthelanguageneededforalocalordinance,butrepresentsagoodbasethatcommunitiescanbuilduponandcustomizetobeconsistentwiththestaffresourcesavailableintheirlocality.Werecommendthatyouusethisdocumentinconjunctionwithothersources,suchasexistingordinancescreatedbyotherstormwatermanagementprogramsinyourgeographicregionthathaveobjectivessimilartoyourprograms.Feelfreetodownloadandalteranyandallportionsofthisdocumenttomeetyourneeds.Throughouttheordinance,therearesectionsinwhichyoumustinsertthenameoftheagencythatyouhavegivenregulatorypoweroverstormwatermanagementissuesinordertocustomizeit.Thesesectionsaredenotedby bold textplacedinbrackets.Byusingthisordinanceand  customizingthesesections,youcancreateaviablelocalordinancewithminimalediting.Italicizedtextwiththissymbol=XXXX= !X=X#=XX!= ##XXX=X#Ԁ*XXXXshouldbeinterpretedascomments,instructions,or  informationtoassisttheordinancewriter.Thistext#XXX*Xs#*XXXXԀshouldnotappear#XXX*X6 #Ԁinyourfinalordinance.     `     h         x6cfB2.p~0\ `E\\\d`x !(#!(#(#(# #U!(#!(# #   !XXModelOrdinancefortheControlof  PostConstructionStormwaterRunoff#XX!  #  \B   TableofContentsSection1.GeneralProvisionsSection2.DefinitionsSection3.PermitProceduresandRequirementsSection4.WaiversSection5.GeneralPerformanceCriteriaforStormwaterManagementSection6.SpecificPerformanceCriteriaforStormwaterTreatmentPracticesSection7.RequirementsforStormwaterManagementPlanApprovalSection8.ConstructionInspectionProvisionsSection9.MaintenanceandRepairRequirementsSection10.EnforcementandViolations  XXSection1#XX  # .0 `  XXGeneralProvisions#XX # ` (#` (#  02A 62021.1.0  FindingsofFact (#(# Itisherebydeterminedthat: $!62Landdevelopmentprojectsandassociatedincreasesinimperviouscoveralterthehydrologicresponseoflocalwatershedsandincreasestormwaterrunoffratesandvolumes,flooding,streamchannelerosion,andsedimenttransportanddeposition;Thisstormwaterrunoffcontributestoincreasedquantitiesofwaterbornepollutants,and;Stormwaterrunoff,soilerosionandnonpointsourcepollutioncanbecontrolledandminimizedthroughtheregulationofstormwaterrunofffromdevelopmentsites.Therefore,the (jurisdictionalstormwaterauthority) establishesthissetofwaterqualityand . quantitypoliciesapplicabletoallsurfacewaterstoprovidereasonableguidancefortheregulationofstormwaterrunoffforthepurposeofprotectinglocalwaterresourcesfromdegradation.Itisdeterminedthattheregulationofstormwaterrunoffdischargesfromlanddevelopmentprojectsandotherconstructionactivitiesinordertocontrolandminimizeincreasesinstormwaterrunoffratesandvolumes,soilerosion,streamchannelerosion,andnonpointsourcepollutionassociatedwithstormwaterrunoffisinthepublicinterestandwillprevent #  threatstopublichealthandsafety. 1.2.0  Purpose &"#(#(# Thepurposeofthisordinanceistoestablishminimumstormwatermanagementrequirementsandcontrolstoprotectandsafeguardthegeneralhealth,safety,andwelfareofthepublicresidinginwatershedswithinthisjurisdiction.Thisordinanceseekstomeetthatpurposethroughthefollowingobjectives: +'( (1).0  minimizeincreasesinstormwaterrunofffromanydevelopmentinordertoreduce  flooding,siltation,increasesinstreamtemperature,andstreambankerosionandmaintaintheintegrityofstreamchannels; (#(# (2).0  minimizeincreasesinnonpointsourcepollutioncausedbystormwaterrunofffrom   developmentwhichwouldotherwisedegradelocalwaterquality (#(# (3).0  minimizethetotalannualvolumeofsurfacewaterrunoffwhichflowsfromanyspecific   siteduringandfollowingdevelopmenttonotexceedthepredevelopmenthydrologicregimetothemaximumextentpracticable. (#(# (4).0  reducestormwaterrunoffratesandvolumes,soilerosionandnonpointsourcepollution,   whereverpossible,throughstormwatermanagementcontrolsandtoensurethatthesemanagementcontrolsareproperlymaintainedandposenothreattopublicsafety. (#(#  !XX#XX! #& %XXTheabovelistisageneralsetofobjectivestoreducetheimpactofstormwateronreceivingwaters.   Thelocalstormwaterauthoritymaywishtosetsomemorespecificobjectives,basedonprioritywaterqualityandhabitatproblems(e.g.,toreducephosphorusloadsbeingdeliveredtorecreationallakes,tosustainaclassXtroutfishery)#XX %&#    1.3.0  Applicability (#(# Thisordinanceshallbeapplicabletoallsubdivisionorsiteplanapplications,unlesseligibleforanexemptionorgrantedawaiverbythe (jurisdictionalstormwaterauthority) underthe  specificationsofSection4ofthisordinance.*XXXXTheordinancealsoappliestolanddevelopment  activitiesthataresmallerthantheminimumapplicabilitycriteriaifsuchactivitiesarepartofalargercommonplanofdevelopmentthatmeetsthefollowingapplicabilitycriteria,eventhoughmultipleseparateanddistinctlanddevelopmentactivitiesmaytakeplaceatdifferenttimesondifferentschedules.#XXX*X #Inaddition,allplansmustalsobereviewedbylocalenvironmental  protectionofficialstoensurethatestablishedwaterqualitystandardswillbemaintainedduringandafterdevelopmentofthesiteandthatpostconstructionrunofflevelsareconsistentwithanylocalandregionalwatershedplans.=XXXX= !X=X#=XX!= ) #=& %X=XThesizeofthesitedevelopmenttowhichpostconstructionstormwatermanagementrunoffcontrol  appliesvariesbutmanycommunitiesoptforasizelimitof5000squarefeetormore.Forsiteslessthan5000squarefeet,localofficialsmaywishtograntanexemptionaslongastheamountofimperviouscovercreateddoesnotexceed1000squarefeet.#=XX %=&s # "y Topreventtheadverseimpactsofstormwaterrunoff,the #XXX=X #(jurisdictionalstormwaterauthority) =XXXX $ ! #XXX=X"#=XXXXhasdevelopedasetofperformancestandardsthatmustbemetatnewdevelopmentsites.These %w!" standardsapplytoanyconstructionactivitydisturbing򀀀ormoresquarefeetofland.The &g"# followingactivitiesmaybeexemptfromthesestormwaterperformancecriteria:  1.0 ` #XXX=X'##=XXXXAnyloggingandagriculturalactivitywhichisconsistentwithanapprovedsoil (h$% conservationplanoratimbermanagementplanpreparedorapprovedbythe (appropriateagency) ,asapplicable.b*H&'` (#` (#   2.0 ` Additionsormodificationstoexistingsinglefamilystructuress+Y'(` (#` (#   3.0 ` Developmentsthatdonotdisturbmorethan򀀀squarefeetofland,provided  theyarenotpartofalargercommondevelopmentplan; ` (#` (# L 7Eh(#-L .3     .3'2Eh  4  .3  0 `   Repairstoanystormwatertreatmentpracticedeemednecessaryby#XXX=X$# (jurisdictional  stormwaterauthority) =XXXX..3''݌ ` (#` (# Ќ  #XXX=X(#=XXXXWhenasitedevelopmentplanissubmittedthatqualifiesasaredevelopmentprojectasdefinedin -  Section2ofthisordinance,decisionsonpermittingandonsitestormwaterrequirementsshallbegovernedbyspecialstormwatersizingcriteria#XXX=XT)#foundinthecurrentstormwaterdesignmanual=XXXX.   Thiscriteriaisdependentontheamountofimperviousareacreatedbytheredevelopmentanditsimpactonwaterquality.#XXX=X*#ԀFinalauthorizationofallredevelopmentprojectswillbedetermined    afterareviewby (jurisdictionalstormwaterauthority) .   =XXXX= !X=X# !!= Q,##XX! p,#& %XXThereareanumberofdecisionstobemadebylocalcommunitieswhenaddressingtheissueof   redevelopmentandstormwatertreatment.Thefirstisdefiningexactlywhatqualifiesasredevelopment.ThedefinitioninSection2isfromthecurrentMarylandStormwaterManagementregulations,andusesthesquarefootsizeoftheprojectanditslanduseclassificationtoestablishthedefinitionofaredevelopmentproject.Theseconddecisioninvolvestowhatlevelofstormwatermanagementstandardsredevelopmentprojectswillbeheld.Providingcosteffectivestormwatertreatmentatredevelopmentsitesisoftenadifficulttask,andtheseprojectsmaybegivenreducedcriteriatomeettoallowforsiteconstraints.TheStateofMarylandcurrentlyrequiresthatproposedredevelopmentprojectdesignsincludeeitheratleasta20percentreductioninexistingsiteimperviousarea,managementofatleast20%ofthewaterqualityvolume,orsomecombinationofboth.#XX %&,# !   1.4.0  CompatibilitywithOtherPermitandOrdinanceRequirements /(#(# Thisordinanceisnotintendedtointerferewith,abrogate,orannulanyotherordinance,ruleorregulation,stature,orotherprovisionoflaw.Therequirementsofthisordinanceshouldbeconsideredminimumrequirements,andwhereanyprovisionofthisordinanceimposesrestrictionsdifferentfromthoseimposedbyanyotherordinance,ruleorregulation,orotherprovisionoflaw,whicheverprovisionsaremorerestrictiveorimposehigher*XXXXprotective#XXX*XW3#standards*XXXX  forhumanhealthortheenvironment#XXX*Xュ3#Ԁshallbeconsideredtotakeprecedence.   1.5.0  Severability "(#(# Iftheprovisionsofanyarticle,section,subsection,paragraph,subdivisionorclauseofthisordinanceshallbejudgedinvalidbyacourtofcompetentjurisdiction,suchorderofjudgmentshallnotaffectorinvalidatetheremainderofanyarticle,section,subsection,paragraph,subdivisionorclauseofthisordinance. 1.6.0  DevelopmentofaStormwaterDesignManual (#%(#(# The (jurisdictionalstormwaterauthority) mayfurnishadditionalpolicy,criteriaand &) %& informationincludingspecificationsandstandards,fortheproperimplementationoftherequirementsofthisordinanceandmayprovidesuchinformationintheformofaStormwaterDesignManual. +') ЇThismanualwillincludealistofacceptablestormwatertreatmentpractices,includingthespecificdesigncriteriaandoperationandmaintenancerequirementsforeachstormwaterpractice.Themanualmaybeupdatedandexpandedfromtimetotime,atthediscretionofthelocalreviewauthority,basedonimprovementsinengineering,science,monitoringandlocalmaintenanceexperience.Stormwatertreatmentpracticesthataredesignedandconstructedinaccordancewiththesedesignandsizingcriteriawillbepresumedtomeettheminimumwaterqualityperformancestandards.=XXXX= !X=X# !!= 9##XX! 9#& %XXLocalcommunitieswillneedtoselecttheminimumwaterqualityperformancestandards(e.g.,80%   TSS,40%P)theywillrequireforstormwatertreatmentpracticesandplacetheseintheirdesignmanual.The80%removalgoalfortotalsuspendedsolids(TSS)isamanagementmeasuredevelopedbyEPAaspartoftheCoastalZoneActReauthorizationAmendmentsof1990.ItwasselectedbyEPAforthefollowingfactors:(1)removalof80%isassumedtocontrolheavymetals,phosphorus,andotherpollutants;(2)anumberofstatesincludingDE,FL,TX,MD,andMArequire/recommendTSSremovalof80%orgreaterfornewdevelopment;and(3)datashowthatcertainstructuralcontrols,whenproperlydesignedandmaintained,canmeetthisperformancelevel.Furtherdiscussionofwaterquality 5  standardsforstormwatermanagementmeasurescanbefoundintheCZARACoastalZone6217(g)   managementmeasuresdocumententitled GuidanceSpecifyingManagementMeasuresforSourcesofNonpointPollutioninCoastalWaters(USEPA,1993).#XX %&i:#  =XXXX= !X=X# !!= &?##XX! E?#Ԁ& %XXThereareanumberofgoodstormwaterdesignmanualsavailablearoundthecountrythat  communitiesmaywishtorefertoincreatingtheirownlocalmanual.TwoexamplesarethenewMarylandDepartmentoftheEnvironment2000MarylandStormwaterDesignManualVolumesI&IIavailableonlineat4|npH RO  5  http://www.mde.state.md.us/environment/wma/stormwatermanual/6ARO&AntP  7np|TAandthe  *& % %&StormwaterManagementManualforWesternWashington,Volumes15availableonlineatB.` hp x (#XB#& % %*&B#  4yaRO  5  http://www.ecy.wa.gov/programs/wq/stormwater/manual.html6CROCtMe  7emGC.#XX %&?# o =XXXX= !X=X# !!= D##XX! >D#& %XXLocalcommunitiesmayalsowishtoconsultanewresourceavailableontheInternetcalledthe }  StormwaterManagersResourceCenter(SMRC) .Thissiteisdedicatedtoprovidinginformationto  stormwatermanagementprogrammanagersinPhaseIIcommunitiestoassistinmeetingtherequirementsofthenewNationalPollutantDischargeEliminationSystemPhaseIIregulations.Amongtheresourcesavailableatthewebsitewillbeasectiondevotedtosupplyingguidanceonhowtobuildastormwatermanual,includingsizinganddesigncriteria.TheSMRCwebsiteandthemanualbuilderresourcesarelocatedat4W2. RO  5  www.stormwatercenter.net.6XGROlG   72.G#XX %&D# %"    XX Section2 #XX RH#.0 `  XX Definitions #XX H#3$ "` (#` (#  AcceleratedErosion meanserosioncausedbydevelopmentactivitiesthatexceedsthenatural }&c"$ processesbywhichthesurfaceofthelandiswornawaybytheactionofwater,wind,orchemicalaction. Applicant meansapropertyowneroragentofapropertyownerwhohasfiledanapplication n)T%'  forastormwatermanagementpermit. ^*D&(  Building meansanystructure,eithertemporaryorpermanent,havingwallsandaroof,   designedfortheshelterofanyperson,animal,orproperty,andoccupyingmorethan100squarefeetofarea. Channel meansanaturalorartificialwatercoursewithadefinitebedandbanksthatconducts   continuouslyorperiodicallyflowingwater. Dedication meansthedeliberateappropriationofpropertybyitsownerforgeneralpublicuse.     Detention "meansthetemporarystorageofstormrunoffinastormwatermanagementpractice   withthegoalsofcontrollingpeakdischargeratesandprovidinggravitysettlingofpollutants. DetentionFacility meansadetentionbasinoralternativestructuredesignedforthepurposeof   temporarystorageofstreamfloworsurfacerunoffandgradualreleaseofstoredwateratcontrolledrates. Developer meansapersonwhoundertakeslanddisturbanceactivities.    DrainageEasement meansalegalrightgrantedbyalandownertoagranteeallowingtheuse    ofprivatelandforstormwatermanagementpurposes. ErosionandSedimentControlPlan meansaplanthatisdesignedtominimizethe ! acceleratederosionandsedimentrunoffatasiteduringconstructionactivities.*XXXX FeeinLieu meansapaymentofmoneyinplaceofmeetingallorpartofthestormwater " performancestandardsrequiredbythisordinance.#XXX*XlP#    Hotspot meansanareawherelanduseoractivitiesgeneratehighlycontaminatedrunoff,with #  concentrationsofpollutantsinexcessofthosetypicallyfoundinstormwater.  HydrologicSoilGroup(HSG) meansaNaturalResourceConservationServiceclassification $  systeminwhichsoilsarecategorizedintofourrunoffpotentialgroups.ThegroupsrangefromAsoils,withhighpermeabilityandlittlerunoffproduction,toDsoils,whichhavelowpermeabilityratesandproducemuchmorerunoff.  ImperviousCover meansthosesurfacesthatcannoteffectivelyinfiltraterainfall(e.g.,  buildingrooftops,pavement,sidewalks,driveways,etc).  IndustrialStormwaterPermit meansanNationalPollutantDischargeEliminationSystem  permitissuedtoacommercialindustryorgroupofindustrieswhichregulatesthepollutantlevelsassociatedwithindustrialstormwaterdischargesorspecifiesonsitepollutioncontrolstrategies.  Infiltration meanstheprocessofpercolatingstormwaterintothesubsoil.   " InfiltrationFacility meansanystructureordevicedesignedtoinfiltrateretainedwatertothe " subsurface.Thesefacilitiesmaybeabovegradeorbelowgrade.  JurisdictionalWetland "meansanareathatisinundatedorsaturatedbysurfacewateror  $  groundwateratafrequencyanddurationsufficienttosupportaprevalenceofvegetationtypicallyadaptedforlifeinsaturatedsoilconditions,commonlyknownashydrophyticvegetation. LandDisturbanceActivity means*XXXXԀanyactivitywhichchangesthevolumeorpeakflow &"# dischargerateofrainfallrunofffromthelandsurface.Thismayinclude#XXX*X@X#thegrading,digging, '#$ cutting,scraping,orexcavatingofsoil,placementoffillmaterials,paving,construction,substantialremovalofvegetation,,oranyactivitywhichbaressoilorrockorinvolvesthe diversionorpipingofanynaturalormanmadewatercourse. *&'  Landowner meansthelegalorbeneficialownerofland,includingthoseholdingtherightto   purchaseorleasetheland,oranyotherpersonholdingproprietaryrightsintheland.*XXXX  MaintenanceAgreement "meansalegallyrecordeddocumentthatactsasapropertydeed  restriction,andwhichprovidesforlongtermmaintenanceofstormwatermanagementpractices.#XXX*X3[#     NonpointSourcePollution meanspollutionfromanysourceotherthanfromanydiscernible,  confined,anddiscreteconveyances,andshallinclude,butnotbelimitedto,pollutantsfromagricultural,silvicultural,mining,construction,subsurfacedisposalandurbanrunoffsources. OffsetFee meansamonetarycompensationpaidtoalocalgovernmentforfailuretomeet   pollutantloadreductiontargets.*XXXX OffSiteFacility meansastormwatermanagementmeasurelocatedoutsidethesubject    propertyboundarydescribedinthepermitapplicationforlanddevelopmentactivity. OnSiteFacility meansastormwatermanagementmeasurelocatedwithinthesubject   propertyboundarydescribedinthepermitapplicationforlanddevelopmentactivity.#XXX*X5^#    Recharge meansthereplenishmentofundergroundwaterreserves.     Redevelopment meansanyconstruction,alterationorimprovementexceeding򀀀squarefeet ! inareaswhereexistinglanduseishighdensitycommercial,industrial,institutionalormultifamilyresidential.*XXXX StopWorkOrder meansanorderissuedwhichrequiresthatallconstructionactivityonasite  bestopped.#XXX*X~a#  *XXXX StormWaterManagement meanstheuseofstructuralornonstructuralpracticesthatare  designedtoreducestormwaterrunoffpollutantloads,dischargevolumes,peakflowdischargeratesanddetrimentalchangesinstreamtemperaturethataffectwaterqualityandhabitat.#XXX*Xab#   *XXXX StormWaterRetrofit #XXX*Xc#Ԁmeansastormwatermanagementpracticedesignedforanexisting  developmentsitethatpreviouslyhadeithernostormwatermanagementpracticeinplaceorapracticeinadequatetomeetthestormwatermanagementrequirementsofthesite." StormwaterRunoff "meansflowonthesurfaceoftheground,resultingfromprecipitation.  :XXXX  StormwaterTreatmentPractices(STPs) #XXX:Xe#:XXXXmeansmeasures,eitherstructuralornonstructural,  thataredeterminedtobethemosteffective,practicalmeansofpreventingorreducingpointsourceornonpointsourcepollutioninputstostormwaterrunoffandwaterbodies.#XXX:X;f#    WaterQualityVolume(WQv) meansthestorageneededtocaptureandtreat90%ofthe   averageannualstormwaterrunoffvolume.Numerically (WQv) willvaryasafunctionoflong ! termrainfallstatisticaldata. Watercourse meansapermanentorintermittentstreamorotherbodyofwater,eithernatural #  ormanmade,whichgathersorcarriessurfacewater.  XXSection3#XX ^i# .0 `  XXPermitProceduresandRequirements#XX i# &"#` (#` (# 3.1.0  PermitRequired.3($$(#(# Nolandownerorlandoperatorshallreceiveanyofthebuilding,gradingorotherlanddevelopmentpermitsrequiredforlanddisturbanceactivitieswithoutfirstmeetingthe requirementsofthisordinancepriortocommencingtheproposedactivity. $+ ''  !XX#XX! k#& %XXTheintentistoensurethatnoactivitiesthatdisturbthelandareissuedpermitspriortoreviewand   approvalofthestormwatermanagementplan.Communitiesmayelecttoissueastormwatermanagementpermitseparateofanyotherlanddevelopmentpermitsrequired,or,asinthisordinance, 8 tietheissuingofconstructionpermitstotheapprovalofafinalstormwatermanagementplan.#XX %&k#  3.2.0  ApplicationRequirements" (#(#  $!Unlessspecificallyexcludedbythisordinance,anylandowneroroperatordesiringapermitforalanddisturbanceactivityshallsubmittothe (jurisdictionalstormwaterauthority) apermit #  applicationonaformprovided forthatpurpose.   Unlessotherwiseexceptedbythisordinance,apermitapplicationmustbeaccompaniedbythefollowinginorderthatthepermitapplicationbeconsidered:astormwatermanagementconceptplan;amaintenanceagreement;andanonrefundablepermitreviewfee.ThestormwatermanagementplanshallbepreparedtomeettherequirementsofSec.5ofthisordinance,themaintenanceagreementshallbepreparedtomeettherequirementsofSec.9ofthisordinance,andfeesshallbethoseestablishedbythe (jurisdictionalstormwaterauthority) .   $!Bn3.3.0  ApplicationReviewFees(#(# Thefeeforreviewofanylanddevelopmentapplicationshallbebasedontheamountoflandtobedisturbedatthesite,andthefeestructureshallbeestablishedbythe (jurisdictional  stormwaterauthority) .Allofthemonetarycontributionsshallbecreditedtoalocalbudgetary   categorytosupportlocalplanreview,inspectionandprogramadministration,andshallbemadepriortotheissuanceofanybuildingpermitforthedevelopment. !XX#XX! t#& %XXLocalcommunitiescanusethesereviewfeestoraisefundsforstaffandresourcestofurthertheir  stormwatermanagementprograms.#XX %&Ot# @& 3.4.0  ApplicationProcedureN4(#(# L S((7L0   .3   .3u2  1  .3  0` (#(#  Applicationsforlanddisturbanceactivitypermitsmustbefiledwiththe _E  (appropriatereviewagency) onanyregularbusinessday..3u)v݌O 5` (#` (# Ќ  0   .3   .3vw2  2  .3  0` (#(#  Acopyofthispermitapplicationshallbeforwardedto (jurisdictional `!F stormwaterauthority) forreview.3vww݌P"6 ` (#` (# Ќ  0   .3   .3x2  3  .3  0` (#(#  Permitapplicationsshallincludethefollowing:twocopiesofthestormwater a#G! managementconceptplan,twocopiesofthemaintenanceagreement,andanyrequiredreviewfees..3xx݌ ` (#` (# Ќ  0   .3   .3hz2  4  .3  0` (#(#  Within򀀀businessdaysofthereceiptofacompletepermitapplication,including R&8"$ alldocumentsasrequiredbythisordinance,the (jurisdictionalstormwater B'(#% authority) shallinformtheapplicantwhethertheapplication,planand 2($& maintenanceagreementareapprovedordisapproved..3hzz݌ ` (#` (# Ќ  & %XXLocalofficialswillneedtodecidetheappropriatetimeframeforreviewofanapplication.Thiswill 3*&( oftenbedeterminedbythestaffavailableforpermitreviewandforaninspectionofsitesundergoingconstruction.#XX %&|# +'* Ї0   .3   .3}2  5  .3  0` (#(#  Ifthepermitapplication,stormwatermanagementplanormaintenanceagreement  aredisapproved,theapplicantmayrevisethestormwatermanagementplanoragreement.Ifadditionalinformationissubmitted,the (jurisdictionalstormwater  authority) shallhave򀀀businessdaysfromthedatetheadditionalinformationis  receivedtoinformtheapplicantthattheplanandmaintenanceagreementareeitherapprovedordisapproved..3}~݌ ` (#` (# Ќ  0   .3   .32  6  .3  0` (#(#  Ifthepermitapplication,finalstormwatermanagementplanandmaintenance   agreementareapprovedbythe (jurisdictionalstormwaterauthority) ,all   appropriatelanddisturbanceactivitypermitsshallbeissued..3݌ ` (#` (# Ќ  3.5.0  PermitDuration (#(# Permitsissuedunderthissectionshallbevalidfromthedateofissuancethroughthedatethe (jurisdictionalstormwaterauthority) notifiesthepermitholderthatallstormwater   managementpracticeshavepassedthefinalinspectionrequiredunderpermitcondition.     XX Section4.0 ` WaiverstoStormwaterManagementRequirements #XX #` (#` (# 4.1.0  WaiversforProvidingStormwaterManagement: (#(# Everyapplicantshallprovideforstormwatermanagementasrequiredbythisordinance,unlessawrittenrequestisfiledtowaivethisrequirement.*XXXXԀRequeststowaivethestormwatermanagement ;! planrequirementsshallbesubmittedtothe#XXX*Xz#Ԁ (jurisdictionalstormwaterauthority) *XXXXԀforapproval.#XXX*Xt# +  *XXXXTheminimumrequirementsforstormwatermanagementmaybewaivedinwholeorinpartupon , writtenrequestoftheapplicant,providedthatatleastoneofthefollowingconditionsapplies: M;   M;և0  2  1  .3  0` (#(#  Itcanbedemonstratedthattheproposeddevelopmentisnotlikelytoimpair - attainmentoftheobjectivesofthisordinance.#XXX*X#*XXXXM;և݌` (#` (# Ќ  0  2.0` (#(#Alternativeminimumrequirementsforonsitemanagementofstormwater . dischargeshavebeenestablishedinastormwatermanagementplanthathasbeenapprovedbythe#XXX*X"# (jurisdictionalstormwaterauthority) *XXXXԀandtheimplementation   oftheplanisrequiredbylocalordinance. ` (#` (# L NUh((SL .3   0  .32Uh  3  .3  0` (#(#  Provisionsaremadetomanagestormwaterbyanoffsitefacility.Theoffsite " facilityisrequiredtobeinplace,tobedesignedandadequatelysizedtoprovidealevelofstormwatercontrolthatisequaltoorgreaterthanthatwhichwouldbeaffordedbyonsitepracticesandthereisalegallyobligatedentityresponsibleforlongtermoperationandmaintenanceofthestormwaterpractice..3݌ ` (#` (# Ќ  L Oe (NL .3   0  .3j2e  4  .3  0` (#(#  The#XXX*Xエ#*XXXXԀ #XXX*X(#(jurisdictionalstormwaterauthority) *XXXXԀfindsthatmeetingtheminimumon &"# sitemanagementrequirementsisnotfeasibledueto#XXX*Xv#thenaturalorexisting '#$ physicalcharacteristicsofasite.*XXXX.3j݌($%` (#` (# Ќ   .3   0  .32e  5  .3  0` (#(#  #XXX*Xs#Nonstructuralpracticeswillbeusedonthesitethatreduce:a)thegenerationof )%& stormwaterfromthesite,b)thesizeandcostofstormwaterstorageandc)thepollutantsgeneratedatthesite.Thesenonstructuralpracticesareexplainedin +'( detailinthecurrentdesignmanualandtheamountofcreditavailableforusingsuchpracticesshallbedeterminedbythe (jurisdictionalstormwaterauthority) *XXXX..3,݌ ` (#` (# Ќ  0   (#(# #XXX*Xu#Ininstanceswhereoneoftheconditionsaboveapplies,the (jurisdictionalstormwater , authority) maygrantawaiverfromstrictcompliancewiththesestormwatermanagement  provisions,aslongasacceptablemitigationmeasuresareprovided.However,tobeeligibleforavariance,theapplicantmustdemonstratetothesatisfactionofthe (jurisdictionalstormwater   authority) thatthevariancewillnotresultinthefollowingimpactstodownstreamwaterways:   0  Deteriorationofexistingculverts,bridges,dams,andotherstructures; (#(# 0  Degradationofbiologicalfunctionsorhabitat; (#(# 0  Acceleratedstreambankorstreambederosionorsiltation; (#(# 0  Increasedthreatofflooddamagetopublichealth,life,property. (#(# Furthermore,wherecompliancewith*XXXXminimumrequirementsforstormwatermanagement#XXX*X#Ԁis R8  waived,theapplicantwillsatisfytheminimumrequirementsbymeetingoneofthemitigationmeasuresselectedbythejurisdictionalstormwaterauthority.Mitigationmeasuresmayinclude, 2 butarenotlimitedto,thefollowing:L X.MYZ[\]^h OL .3   .3ƙ23  0    Thepurchaseanddonationofprivatelyownedlands,orthegrantofaneasementtobe D* dedicatedforpreservationand/orreforestation.Theselandsshouldbelocatedadjacenttothestreamcorridorinordertoprovidepermanentbufferareastoprotectwaterqualityandaquatichabitat,.3ƙ݌ (#(# Ќ   .3   .323  0    Thecreationofastormwatermanagementfacilityorotherdrainageimprovementson %  previouslydevelopedproperties,publicorprivate,thatcurrentlylackstormwatermanagementfacilitiesdesignedandconstructedinaccordancewiththepurposesandstandardsofthisordinance,.3ϛ݌ (#(# Ќ   .3   .3y23  0    Monetarycontributions(FeeinLieu)tofundstormwatermanagementactivitiessuchas  researchandstudies(e.g.,regionalwetlanddelineationstudies,streammonitoringstudiesforwaterqualityandmacroinvertebrates,streamflowmonitoring,threatenedandendangeredspeciesstudies,hydrologicstudies,andmonitoringofstormwatermanagementpractices..3y݌ (#(# Ќ  4.2.0  *XXXXFeeinLieuofStormwaterManagementPractices.# (#(# Wherethe#XXX*Xッ# (jurisdictionalstormwaterauthority) *XXXXԀwaivesallorpartoftheminimumstormwater $ ! managementrequirements,orwherethewaiverisbasedontheprovisionofadequatestormwaterfacilitiesprovideddownstreamoftheproposeddevelopment,theapplicantshallberequiredtopayafeeinanamountasdeterminedbythe#XXX*X{#*XXXXԀ #XXX*X#(jurisdictionalstormwaterauthority) *XXXX. '#$ #XXX*XU#Whenanapplicantobtainsawaiveroftherequiredstormwatermanagement,themonetary ($% contributionrequiredshallbeinaccordancewithafeeschedule(unlessthedeveloperandthestormwaterauthorityagreeonagreateralternatecontribution)establishedbythe (jurisdictional *&' stormwaterauthority) ,andbasedonthecubicfeetofstoragerequiredforstormwater +'( managementofthedevelopmentinquestion.Allofthemonetarycontributionsshallbecreditedtoanappropriatecapitalimprovementsprogramproject,andshallbemadebythedeveloperpriortotheissuanceofanybuildingpermitforthedevelopment. 4.3.0  Dedicationofland(#(# Inlieuofamonetarycontribution,anapplicantmayobtainawaiveroftherequiredstormwatermanagementbyenteringintoanagreementwiththe (jurisdictionalstormwaterauthority) for   thegrantingofaneasementorthededicationoflandbytheapplicant,tobeusedfortheconstructionofanoffsitestormwatermanagementfacility.Theagreementshallbeenteredintobytheapplicantandthe (jurisdictionalstormwaterauthority) priortotherecordingofplatsor,    ifnorecordplatisrequired,priortotheissuanceofthebuildingpermit.  XXSection5.0 ` GeneralPerformanceCriteriaforStormwaterManagement #XX  # ` (#` (# Unlessjudgedbythe (jurisdictionalstormwaterauthority) =XXXXԀtobeexemptorgrantedawaiver,   thefollowingperformancecriteriashallbeaddressedforstormwatermanagementatallsites:(A).0  Allsitedesignsshall#XXX=X#establishstormwatermanagementpracticestocontrolthepeakflow ) ratesofstormwaterdischargeassociatedwithspecifieddesignstormsandreducethegenerationofstormwater.Thesepracticesshouldseektoutilizeperviousareasforstormwatertreatmentandtoinfiltratestormwaterrunofffromdriveways,sidewalks,rooftops,parkinglots,andlandscapedareastothemaximumextentpracticaltoprovidetreatmentforbothwaterqualityandquantity. (#(# =XXXX= !X=X# !!= ##XX!  #& %XXThereareseveralsourcesofclimatologicalreferencesthatcanbeconsultedtofindtherainfall  depthsfortheappropriatedesignstormintervals(1,10,25,and100year).TheNOAANationalClimatologicalDataCenterhasa SummaryoftheDaydatabasethatcanproviderainfallnumbersformostmajorcitiesandairportsinthecountry.AnotherpossiblesourceistheUrbanHydrologyforSmall  Watersheds,TR55(TechnicalRelease55)publishedbytheEngineeringDivision,UnitedStatesNatural  ResourceConservationService(formerlyknownastheSoilConservationService)UnitedStatesDepartmentofAgriculture,June1986.#XX %&v# x^ (B).0  Allstormwaterrunoffgeneratedfromnewdevelopmentshallnotdischargeuntreated !l stormwaterdirectlyintoajurisdictionalwetlandorlocalwaterbodywithoutadequatetreatment.Wheresuchdischargesareproposed,theimpactoftheproposalonwetlandfunctionalvaluesshallbeassessedusingamethodacceptabletothe (jurisdictional V$< ! stormwaterauthority) .Innocaseshalltheimpactonfunctionalvaluesbeanylessthan F%,!" allowedbytheArmyCorpofEngineers(ACE)orthe (AppropriateStateAgency)  6&"# responsiblefornaturalresources.=XXXX&' #$(#(# (C).0  Annualgroundwaterrechargeratesshallbemaintained,bypromotinginfiltrationthrough 7($% theuseofstructuralandnonstructuralmethods.Ataminimum,annualrechargefromthepostdevelopmentsiteshallmimictheannualrechargefrompredevelopmentsite conditions.+&((#(# #XXX=X!# !XX#XX! #Ԁ& %XXRechargeisarelativelynewstormwatercriteria,andhasbeenimplementedsofarinthe   MassachusettscoastalzoneandinMaryland.Therechargecriteriarequiresconsiderableefforttouseexistingperviousareasforstormwatertreatmentandinfiltration,whichmeansthatitmustbeconsideredveryearlyinthesitedesignprocesswhenbasicdecisionsaboutlayoutandvegetativecoveraremade.  =& % %&Foradditionaldiscussionofrechargecriteria,consultthemanualbuilderontheStormwaterManagers  ResourceCenter(SMRC)at4z RO  5  www.stormwatercenter.net.6ǶRO۶llow  7e #=XX %=&,#  (D).0  Fornewdevelopment,structuralstormwatertreatmentpracticesshallbedesignedto   remove򀀀%oftheaverageannualpostdevelopmenttotalsuspendedsolidsload(TSS).It   ispresumedthataSTPcomplieswiththisperformancestandardifitis: (#(# L X.MYZ[\]^hhX.MYZ[\]^L .3     .3X23  0 `   sizedtocapturetheprescribedwaterqualityvolume(WQv).#XXX=X#=XXXX.3X݌ ` (#` (# Ќ  0  0` (#(#designedaccordingtothespecificperformancecriteriaoutlinedinthelocal   stormwaterdesignmanual, ` (#` (#    ` constructedproperly,and   0   ` maintainedregularly. (#(# #XXX=X9# !XX#XX! #Ԁ& %XXForpostconstructionstormwaterrunoff,theabilityofstormwatermanagementprogramstomeet  federalguidelinesundertheNPDESregulationswillbecomeincreasinglyimportant.Alocalgovernmentseekingtomanagerunofftoachievewaterqualitystandardshasanumberofoptionsforreachingtheirgoal.Theoptionsarelistedbelow,fromthemosttypicalstandardstormwaterqualitypracticetomoreadvancedprogramoptions.Eachoptionhasanassociatedlevelofeffortforthemanagementofstormwater,andthelikelihoodofrealizingwaterqualitytreatmentgoalsdependsontheoptionalocalgovernmentselects.LocalgovernmentsshouldassesstheoptiontheywishtoselectinlightofnewPhaseIIregulationsandthecurrentabilityoftheirstormwatermanagementstafftomeetmoreextensivelocal/statestaffreviewandinspectionrequirements. Option1.RequireStormwaterTreatmentPracticesforStormwaterQuality  P6 Manycurrentstormwaterprogramssimplyrequirethatthedeveloperinstallstormwatertreatmentpractices,butdonotspecifyatargetforspecificpollutantreductionperformance.Theseprogramssimplyrequirethatastandardvolumeofstormwaterbetreated(e.g.,ahalfinchofrunoff).Manyoftheseprogramsalsohavegenerouswaiverandexemptionprovisions,sothatasmuchas25%ofallnewdevelopmentcanavoidcriteriaforwaterquality.Unlessthetargetremovalgoalsareverylow,thesecommunitiescannotexpecttheircurrentprogramstoeliminatenetadditionalpollutantsassociatedwithfuturedevelopment.(SeeCityofKnoxville,TNStormwaterandStreetOrdinance,at4~erBRO  5  http://www.ci.knoxville.tn.us/6ROrman  7erB) r$X "  Option2.InstituteMoreRigorousDesignStandardsforStormwaterPractices.  l&R"$ Anumberofcommunitieshaveimprovedtheirstormwaterprogramsbystrengtheningtheirdesignstandardsforstormwaterpractices.Thishasinvolvednarrowingthelistofacceptablepracticestothosewithaprovenabilitytoremoveparticularpollutants,increasingthevolumeofrunoffthatistreatedbyeachpractice(e.g,treatfirst1"ofstormwaterrunoff),clampingdownonwaiversandexemptions(or requiringafeeinlieu),andrequiringdesignfeaturesthatreducemaintenanceproblems._  *&) Theadvantageofthisprogramoptionisthatcompliancecanbepresumedaslongasdesignersfollow thedesignrules.Itdoesrequireagoodstormwatermanualandmoreextensivelocal/statestaffreviewandtraining.Itcanachievesignificantreductionforsomepollutants,suchassedimentandnutrients.Thedisadvantageoftheprogramoptionisthatcurrentstormwatertechnologymaynotbeeffectiveenoughforsomepollutants(e.g.,bacteria),orcapableofreducingthenetadditionalloadforhighlevelsfromfuturedevelopment.(ForanexampleseeMarylandDepartmentoftheEnvironment2000MarylandStormwaterDesignManualavailableat4inp RO  5  http://www.mde.state.md.us/environment/wma/stormwatermanual/6ROntP  7npB.Thestatesof ? % NewYorkandVermontareintheprocessofadoptingsimilardesignstandardsfortheirmanuals). Option3.RequireOnSiteLoadCalculation     Ahandfulofcommunitieshaveadoptedanapproachwherebythedesignengineermustcalculatepreandpostdevelopmentloadsforaparticularpollutant,andthendesignasystemofpracticestomeetaloadreductiontarget,basedonSTPremovalrates.Phosphorushasbeenusedinmostcases,andtheloadreductiontargetvaries.Thisoptionresultsinmoredirecteddesigngearedmorespecificallytothepollutantofconcern.The_ onsite_ Ԁloadcalculationoptionhasseveraldisadvantages.First,designerscanselecttousemathmodelingtotheiradvantagetoreducecostsandcomeintocompliance.Second,technicaldatatosupporttheprogramoptionarelimitedtojustafewparameters,suchasphosphorus,nitrogenandsediment.Third,theremovalratesforthestormwaterpracticesseldomaccountforfactorswherepollutantloadremovaliscompromised,andtendtobeoptimistic.Lastly,thisprogramoptionisveryintensiveintermsoflocalreviewandcompliance,andrequiresmorestaffingtoimplement.(Foranexampleof_ onsite_ ԀloadcalculationseethepublicationPhosphorusControlinLakeWatersheds:ATechnicalGuidetoEvaluatingNewDevelopmentbytheMaineDepartmentofEnvironmentalProtection.:& % %&AnotherexamplewherethisoptionhasbeenappliedisforNewYorkCitywatersupply i areas).#& % %:&# _E  Option4.LoadCalculationw/StormwaterOffsetFeetoProvideRetrofitsonExistingDevelopment  \B Inthisprogramoption,acommunityrequiresthe_ onsite_ ԀloadcalculationdescribedinOption3,butisveryconservativeintheassumptionsitallowsonloadingandremovalefficiency.Consequently,designersatmostsitescannotfullycomplywiththeloadreductionfortherequirementattheirsite.Tofullycomply,theymustpayanoffsetfeetothelocalgovernmentwhichisusedtosupportdesignandconstructionofstormwaterretrofitsatexistingdevelopmentinthewatershed.Thefeeissetatthecostofprovidinganequivalentamountofpollutantremovalelsewhere(dollars/pound).Theadvantageofthisapproachisthatitprovidesameansoffinancingthestormwaterretrofitsneededtoreducepollutantloadsfromexistingdevelopment.Itdoesrequiregreaterlocalstaffingtofind,designandbuildtheretrofitswhichoffsettheloadsfromnewdevelopment.Ifadministeredproperly,thisprogramoptioncanpotentiallyeliminatethenetadditionalloadfromnewdevelopment.Severalcommunitiescurrentlyprovidethisoptionfordevelopers,butitisnotclearhowmuchrevenuehasbeencollectedsofar.(ThisoptionhasbeenappliedinMarylandCriticalAreasandVirginiaChesapeakeBayresourcemanagementareas.=& % %&ԀFormoreinformation,seethewebsiteregardingtheMarylandCriticalAreaActat &"' _ 4}ucRO  5  ""http://www.dnr.state.md.us/criticalarea/""6ROons  7ucP_ ԀandtheVirginiaChesapeakeBayPreservationAreaRegulation '#( at4{ucnRO  5  http://www.cblad.state.va.us/regs.htm#& % %=&#=& % %&6ROons  7ucX)#=XX %=&V# (e$) #XXX=Xk#=XXXX(E).0  Toprotectstreamchannelsfromdegradation,aspecificchannelprotectioncriteriashall *s&+ beprovidedasprescribedinthecurrentstormwatermanual.}+c',(#(# #XXX=XC#=XXXX= !X=X# !!= c##XX! #Ԁ& %XXChannelprotectionisarelativelynewcriteria,butisincreasinglyviewedasacriticaloneduetothe  mountingevidencethatstreamchannelsenlargeinresponsetowatersheddevelopment.Studieshavefoundhigherbankerosionratesandincreased_ instream_ Ԁsedimentloadsforurbanstreamswhencomparedtothe520%estimatefortheannualsedimentbudgetattributabletobankerosioninruralstreams(WallingandWoodward,1995;Collinsetal.,1997).Researchalsoindicatesthatchannelenlargementcanbeginatarelativelylowlevelofwatersheddevelopment,asindicatedbytheamountofimperviouscover.Onestudyestimatedthatchannelerosionrateswerethreetosixtimeshigherinamoderatelyurbanizedwatershed(14%imperviouscover)thaninacomparableruralone,withlessthan2%imperviouscover(_ Neller_ ,1988). ` F Thebasicmethodologytocalculatechannelenlargementreliesonobtaininghistoricalcrosssectional ] C  datafrompastsurveys(oftenobtainedfromtransportationagenciesorpublicworksdepartmentsthatconductedsurveysatthetimeofroadconstructionorimprovementprojects)andcomparingthesewithcurrentcrosssectionaldataobtainedfromfieldsurveysconductedatthetimeofthestudy.The   approachalsoutilizespredictive(i.e.,empirical)equationstoestimateanultimatechannelenlargementratiooncethechannelhasenlargedsufficientlytobeinbalancewithitshydrologicalforces.   :& % %&BasicOptionsforStreamChannelProtection  Manydifferentdesigncriteriahavebeensuggestedtoprotectdownstreamchannelsfromerosion.Itshouldbeclearlynotedthatnoneofthesecriteriahaveyetbeenmonitoredinthefieldtodemonstratetheireffectiveness,andmostarebasedonhydrologicorhydraulicmodelingofstreams.Thethreeoptionsthatappeartoholdsomepromiseare: 24hourdetentionoftheoneyearstormevent .Thiscriteriawouldresultinupto24hoursofdetention + forrunoffgeneratedbyarainfalldepthbasedonannualrainfallforaregion.Smallerstormseventswouldalsoexperiencesomedetention,butprobablymuchlessthan24hours.Thepremiseofthiscriteriaisthatrunoffwouldbestoredandreleasedinsuchagradualmannerthatcriticalerosivevelocitieswouldseldombeexceededindownstreamchannels.Therequiredvolumeneededfor1yearextendeddetentionissignificant;itisroughlyequivalenttoabout90to95%oftherequiredvolumeneededfortenyearpeakdischargecontrol.Consequently,theneedfortwoyearpeakdischargemanagementwouldbeeliminatedwhenthe1yearEDisprovided,aslongasthetenyearpeakdischargecontrolisachieved. #& % %:&n#(Foranexample,seeMarylandDepartmentoftheEnvironment2000MarylandStormwaterDesign ,  Manualavailableat4np RO  5  http://www.mde.state.md.us/environment/wma/stormwatermanual/63ROGntP  7npu.Thestatesof !  NewYorkandVirginiaalsousethisdesigncriteriaforstreamchannelprotectionintheirstormwaterdesignmanuals).:& % %&  "" Distributedrunoffcontrol(_ DRC_ ): Thiscriteriahasbeendevelopedby_ MaCrae_ Ԁ(1993)andinvolves $ $ complexfieldassessmentsandmodelingtodeterminethehydraulicstressanderosionpotentialofbankmaterials.Thecriteriastatesthatchannelerosionisminimizedifthealterationinthetransversedistributionoferosionpotentialaboutachannelparameterismaintainedconstantwith_ predevelopment_ values,overtherangeofavailableflows,suchthatthechannelisjustabletomovethedominantparticlesizeofthebedload.ThisCanadianmethodholdspromise,buthasnotbeentestedextensivelyintheUnitedStatesandrequiressignificantlygreaterdatacollectionandmodelingthenanyoftheother methods. *&+ #& % %:&#(Foradiscussionofthiscriteria,seetheVermontStormwaterManagementHandbookTechnical   SupportDocumentAppendixB,November2000). :& % %&   Bankfullcapacity/durationcriteria: Thiscriteriahasbeenadvancedby_ Tapley_ Ԁetal1996,andstates  thatthepostdevelopment,bankfullflowfrequency,durationanddepthmustbecontrolledto_ predevelopment_ Ԁvaluesatadesignatedcontrolpoint(s)inthechannel.TheRuleofthumbforselectingcontrolpoint(s)istousea10:1ratioofpeakdischargefromtheoneyearstormforthedevelopedsitetothedischargefromthestreamforthesamefrequencystorm(_ Tapley_ Ԁetal,1996).Intheory,thiscriteriashouldresultinahighlevelofdownstreamprotection.Thepracticalproblemisindefininghowthecriteriaistobeinterpreted;whethersubbankfullevents(thattypicallyerodethetoeofthestreambank)shouldalsobeconsidered;andpreciselywherethe"bankfull"shouldbemeasured.Forexample,thechannelofmanystreamshavebeenmodifiedinthepastbypriorlandusesandchannelization,andmaynotrepresentthe"true"channel.Inothercases,thestormwateroutfalldischargelaterallytoastream,anditisthereforedifficulttoassignwhichflowsthedeveloperisactuallyresponsibleforcontrolling.ProsandConsofChannelProtectionSizingCriteria.Eachofthethreeoptionshassomelimitations.Forexample,boththe_ DRC_ Ԁandbankfullcapacitysizingcriteriaoptionslackwidelyacceptedoruniversaldesignmethodologies.Ineachcase,localstreamcrosssectionand/orsoilmeasurementsareneeded,andconsiderablecontentionbetweenthedesignerandthereviewercanbeexpectedonhowandwheretheanalysisshouldbeperformed.Giventhemanyoperationalproblemscurrentlyassociatedwitheitheroption,andthelackofatesteddesignmethodologyatpresent,thetwooptionsprobablydeservefurtherstudy,butarenotreadyforwideapplication.Thisleavesonlyoneremainingoptiontheoneyear24hourdetentioncriteria.It,too,hassomelimitations:  resultsinunacceptablysmalldiameterorificesforsiteslessthantenacresinsize. tZ   requiresastoragevolumeroughlyequivalenttothatneededfortwoyearcontrol. qW L r.MYZ[\]^3hhX.MYZ[\]^L .3   .3233  0    hasnotbeen"tested"bycontinuoussimulationmodelingtodetermineifacceptabledetention nT timescanbeachievedforsmallerstormscanbeachieved(1.0to1.5inches)..3݌ (#(# Ќ    isonlyneededinstreamsthataresusceptibletobankerosion. G!-  Basedontheforegoing,itappearsthatthebestoptiontoprovidechannelprotection(Cpv)is12to24 A#'" hourextendeddetentionoftheoneyear24hourstormevent.ThisCpvrequirementonlyappliestosites $ # greaterthantenacresinsize.Localgovernmentsmaywishtoretaintheoptionofemployingthe_ DRC_ Ԁorbankfullcapacity/durationcriteriaasanalternative,shouldtheiranalyticalanddesignrequirementsbecomemoresimplifiedandrefinedinthefuture#& % %:&#Therearesomebasicexemptionstowherethechannelprotectioncriteriashouldbeapplied(small ($( drainageareas,directdischargetotidalwatersoralake,flatterrainetc),andcommunitiesmustdecidehowandwhenthiscriteriawillberequired.#XX %&# c*I&*  `+F'+ _ (F).0  Stormwaterdischargestocriticalareaswithsensitiveresources(i.e.,coldwaterfisheries,  shellfishbeds,swimmingbeaches,rechargeareas,watersupplyreservoirs)maybesubjecttoadditionalperformancecriteria,ormayneedtoutilizeorrestrictcertainstormwatermanagementpractices. (#(# (G).0  Certainindustrialsitesarerequiredtoprepareandimplementastormwaterpollution  preventionplan,andshallfileanoticeofintent(NOI)undertheprovisionsoftheNationalPollutantDischargeEliminationSystem(NPDES)generalpermit.Thestormwaterpollutionpreventionplanrequirementappliestobothexistingandnewindustrialsites. (#(# =XXXX= !X=X# !!= ]##XX! |#Ԁ& %XXApplicantsandlocalcommunitiesmaywishtoconsulttheEnvironmentalProtectionAgencywebsite    at4boanRO  5  http://www.epa.gov/owm/swm/phase26ROinc  7oaXԀformoreinformationonPhaseIIrequirements.#XX %&#   (H).0  Stormwaterdischargesfromlandusesoractivitieswithhigherpotentialpollutant   loadings,knownas hotspots,mayrequiretheuseofspecificstructuralSTPsandpollutionpreventionpractices. (#(# (I).0  Priortodesign,applicantsarerequiredtoconsultwiththe (jurisdictionalstormwater   authority) =XXXXԀtodetermineiftheyaresubjecttoadditionalstormwaterdesignrequirements.(#(# #XXX=XP#(J).0  ThecalculationsfordeterminingpeakflowsasfoundintheStormwaterDesignManual  shallbeusedforsizingallstormwatermanagementpractices.=XXXX(#(# #XXX=Xキ# XX Section6 .0 ` #XX #  XXBasicStormwaterManagementDesignCriteria #XX z# ` (#` (#  !XX#XX!  # XXԀ#XX O#& %XXRatherthanplacespecificstormwaterdesigncriteriaintoanordinance,itisoftenpreferabletofully Y? detailtheserequirementsinastormwaterdesignmanual.Thisallowsspecificdesigninformationtochangeovertimeasnewinformationortechniquesbecomeavailablewithoutrequiringtheformalprocessneededtochangeordinancelanguage.Theordinancecanthenrequirethosesubmittinganydevelopmentapplicationtoconsultthecurrentstormwaterdesignmanualfortheexactdesigncriteriaforthestormwatermanagementpracticesappropriatefortheirsite.   IntheMarylandStormwaterDesignManual,forexample,thereareasetofspecifiedperformance  criteriaforeachstormwatermanagementpractice,basedonsixfactors: M;   M;0  233  0` (#(#  SiteDesignFeasibilityM;݌ ` (#` (# Ќ   M;    M;0  233  0` (#(#  ConveyanceIssuesM;݌!` (#` (# Ќ   M;    M; 0  233  0` (#(#  PretreatmentRequirementsM;  ݌"` (#` (# Ќ   M;    M;x 0  233  0` (#(#  Treatment/GeometryConditionsM;x  ݌# ` (#` (# Ќ   M;    M;] 0  233  0` (#(#  Environmental/LandscapingStandardsM;]  ݌$ !` (#` (# Ќ   M;    M;H 0  233  0` (#(#  MaintenanceNeedsM;H s ݌%!"` (#` (# Ќ  Eachcommunitywillneedtodecidethespecificdesignandsizingcriteriaforthestormwater &"# managementpracticestheyallow,andselectastormeventfrequency(1,2,10,100year)thattheybelievewillmeettheirstormwaterqualityandquantitycontrolrequirements.#XX %&# (m$%  +'( 6.1.0  MinimumControlRequirements(#(# Allstormwatermanagementpracticeswillbedesignedsothatthespecificstormfrequencystoragevolumes(e.g.,recharge,waterquality,channelprotection,10year,100year)asidentifiedinthecurrentstormwaterdesignmanualaremet,unlessthe (jurisdictional   stormwaterauthority) grantstheapplicantawaiverortheapplicantisexemptfromsuch  requirements.Inaddition,ifhydrologicortopographicconditionswarrantgreatercontrolthanthatprovidedbytheminimumcontrolrequirements,the (jurisdictionalstormwaterauthority) reservestheright   toimposeanyandalladditionalrequirementsdeemednecessarytocontrolthevolume,timing,andrateofrunoff.6.20  SiteDesignFeasibility (#(# Stormwatermanagementpracticesforasiteshallbechosenbasedonthephysicalconditionsofthesite.Amongthefactorsthatshouldbeconsidered: L k%(hr.MYZ[\]^L .3   .3+2%  1  .3  0    Topography.3+V݌ (#(# Ќ   .3   .32%  2  .3  0    MaximumDrainageArea.3'݌(#(# Ќ   .3   .32%  3  .3  0    DepthtoWaterTable.3݌"(#(# Ќ   .3   .32%  4  .3  0    Soils.3݌3(#(# Ќ   .3   .32%  5  .3  0    Slopes.3݌D*(#(# Ќ   .3   .3L2%  6  .3  0    Terrain.3Lw݌U;(#(# Ќ   .3   .32%  7  .3  0    Head.3F݌fL(#(# Ќ   .3   .32%  8  .3  0    Locationinrelationtoenvironmentallysensitivefeaturesorultraurbanareas.3݌w](#(# Ќ  L j((kLApplicantsshallconsulttheStormwaterDesignManualforguidanceonthefactorsthatdeterminesitedesignfeasibilitywhenselectingastormwatermanagementpractice.L U((jL6.3.0  ConveyanceIssues(#(# Allstormwatermanagementpracticesshallbedesignedtoconveystormwatertoallowforthemaximumremovalofpollutantsandreductioninflowvelocities.Thisshallinclude,butnotbelimitedto:L l5((UL .3   .325  1  .3  0    Maximizingofflowpathsfrominflowpointstooutflowpoints.3݌!(#(# Ќ   .3   .325  2  .3  0    Protectionofinletandoutfallstructures.3!݌"(#(# Ќ   .3   .325  3  .3  0    Eliminationoferosiveflowvelocities.3݌#(#(# Ќ   .3   .325  4  .3  0    Providingofunderdrainsystems,whereapplicable.3݌$ (#(# Ќ  TheStormwaterDesignManualshallprovidedetailedguidanceontherequirementsforconveyanceforeachoftheapprovedstormwatermanagementpractices.6.4.0  PretreatmentRequirements($$(#(# Everystormwatertreatmentpracticeshallhaveanacceptableformofwaterqualitypretreatment, inaccordancewiththepretreatmentrequirementsfoundinthecurrentstormwaterdesignmanual. *&& Certainstormwatertreatmentpractices,asspecifiedintheStormwaterDesignManual,areprohibitedevenwithpretreatmentinthefollowingcircumstances: 0  A.Stormwaterisgeneratedfromhighlycontaminatedsourceareasknownas hotspots (#(# 0  B.Stormwateriscarriedinaconveyancesystemthatalsocarriescontaminated,nonstormwaterdischarges (#(# 0  C.Stormwaterisbeingmanagedinadesignatedgroundwaterrechargearea. (#(# 0  D.Certaingeologicconditionsexist(e.g.,karst)thatprohibittheproperpretreatmentofstormwater. (#(# L V (lL6.5.0  Treatment/GeometryConditionsP 6 (#(# AllstormwatermanagementpracticesshallbedesignedtocaptureandtreatstormwaterrunoffaccordingtothespecificationsoutlinedintheStormwaterDesignManual.Thesespecificationswilldesignatethewaterquantityandqualitytreatmentcriteriathatapplytoanapprovedstormwatermanagementpractice.6.6.0  LandscapingPlansRequiredS9(#(# Allstormwatermanagementpracticesmusthavealandscapingplandetailingboththevegetationtobeinthepracticeandhowandwhowillmanageandmaintainthisvegetation.Thisplanmustbepreparedbyaregisteredlandscapearchitectorsoilconservationdistrict.6.7.0  MaintenanceAgreementsfL(#(# Allstormwatertreatmentpracticesshallhaveanenforceableoperationandmaintenanceagreementtoensurethesystemfunctionsasdesigned.Thisagreementwillincludeanyandallmaintenanceeasementsrequiredtoaccessandinspectthestormwatertreatmentpractices,andtoperformroutinemaintenanceasnecessarytoensureproperfunctioningofthestormwatertreatmentpractice.Inaddition,alegallybindingcovenantspecifyingthepartiesresponsibleforthepropermaintenanceofallstormwatertreatmentpracticesshallbesecuredpriortoissuanceofanypermitsforlanddisturbanceactivities.6.8.0  NonStructuralStormwaterPractices9!(#(# Theuseofnonstructuralstormwatertreatmentpracticesisencouragedinordertominimizetherelianceonstructuralpractices.Creditintheformofreductionsintheamountofstormwaterthatmustbemanagedcanbeearnedthroughtheuseofnonstructuralpracticesthatreducethegenerationofstormwaterfromthesite.Thesenonstructuralpracticesareexplainedindetailinthecurrentdesignmanualandapplicantswishingtoobtaincreditforuseofnonstructuralpracticesmustensurethatthesepracticesaredocumentedandremainunalteredbysubsequentpropertyowners.  +''   XXSection7.0 ` RequirementsforStormwaterManagementPlanApproval#XX -# ` (#` (#  7.1.0  StormwaterManagementPlanRequiredforAllDevelopments.dJ(#(# Noapplicationfordevelopmentwillbeapprovedunlessitincludesastormwatermanagementplandetailinginconcepthowrunoffandassociatedwaterqualityimpactsresultingfromthedevelopmentwillbecontrolledormanaged.Thisplanmustbepreparedbyanindividualapprovedbythe (jurisdictionalstormwaterauthority) andmustindicatewhetherstormwater E + willbemanagedonsiteoroffsiteand,ifonsite,thegenerallocationandtypeofpractices.Thestormwatermanagementplan(s)shallbereferredforcommenttoallotherinterestedagencies,andanycommentsmustbeaddressedinafinalstormwatermanagementplan.Thisfinalplanmustbesignedbyalicensedprofessionalengineer(PE),whowillverifythatthedesignofallstormwatermanagementpracticesmeetthesubmittalrequirementsoutlinedintheSubmittalChecklistfoundinthestormwaterdesignmanual.Nobuilding,grading,orsedimentcontrolpermitshallbeissueduntilasatisfactoryfinalstormwatermanagementplan,orawaiverthereof,shallhaveundergoneareviewandbeenapprovedbythe (jurisdictionalstormwater   authority) afterdeterminingthattheplanorwaiverisconsistentwiththerequirementsofthis  ordinance. !XX#XX! 4#& %XXOne*& % %&Ԁwaytohandlethesubmittalrequirementsforboththeconceptplanandthefinaldesignplanis  toplaceSubmittalChecklistsinthestormwaterdesignmanualandrequirethattheyareusedforsubmissionofanyplan.Thebenefitofthisisthatchangesinsubmittalrequirementscanbemadeasneededwithoutneedingtorevisitandaltertheoriginalordinance.ThreemodelchecklistscanbefoundontheStormwaterManagersResourceCenter(SMRC)websiteat4ltRO  5  www.stormwatercenter.net66RO6heS  7lt6#*XX %*&a4#.  #XXX*Xg4#7.2.0  StormwaterManagementConceptPlanRequirements(#(# Astormwatermanagementconceptplanshallberequiredwithallpermitapplicationsandwill  includesufficientinformation(e.g.,maps,hydrologiccalculations,etc)toevaluatetheenvironmentalcharacteristicsoftheprojectsite,thepotentialimpactsofallproposeddevelopmentofthesite,bothpresentandfuture,onthewaterresources,andtheeffectivenessandacceptabilityofthemeasuresproposedformanagingstormwatergeneratedattheprojectsite.Theintentofthisconceptualplanningprocessistodeterminethetypeofstormwatermanagementmeasuresnecessaryfortheproposedproject,andensureadequateplanningformanagementofstormwaterrunofffromfuturedevelopment.Toaccomplishthisgoalthefollowinginformationshallbeincludedintheconceptplan:L U( VL .3   .3;2U  1  .3  0    Amap(ormaps)indicatingthelocationofexistingandproposedbuildings,roads, q$W ! parkingareas,utilities,structuralstormwatermanagementandsedimentcontrolfacilities.Themap(s)willalsoclearlyshow*XXXXproposedlandusewithtabulationofthepercentageof Q&7"# surfaceareatobeadaptedtovarioususes;drainagepatterns;locationsofutilities,roadsandeasements;thelimitsofclearingandgrading;#XXX*X=#Awrittendescriptionofthesiteplan 1($% andjustificationofproposedchangesinnaturalconditionsmayalsoberequired..3;;݌ (#(# Ќ   !XX#XX! >#& %XXThisprojectdescriptionandsiteplanrequirementincludesinformationnormallyfoundinanErosion 2*&' andSedimentControlplan.ForlocalgovernmentsthatdonotcurrentlyhaveESCplanrequirementsor t+Z'( arelookingtoupgradetheirESCordinancelanguage,thereisamodelErosionandSedimentControlordinancelocatedattheSMRCwebsite.#XX %&/?#   .3   .3 A2U  2  .3  0    Sufficientengineeringanalysistoshowthattheproposedstormwatermanagement  measuresarecapableofcontrollingrunofffromthesiteincompliancewiththisordinanceandthespecificationsoftheStormwaterDesignManual..3 A6A݌ (#(# Ќ   .3   .3B2U  3  .3  0    Awrittenorgraphicinventoryofthenaturalresourcesatthesiteandsurroundingareaas   itexistspriortothecommencementoftheprojectandadescriptionofthewatershedanditsrelationtotheprojectsite.*XXXXThisdescriptionshouldincludeadiscussionofsoil   conditions,forestcover,topography#XXX*X0D#,wetlands,andothernativevegetativeareasonthe    site.Particularattentionshouldbepaidtoenvironmentallysensitivefeaturesthatprovideparticularopportunitiesorconstraintsfordevelopment..3BB݌ (#(# Ќ   .3   .3E2U  4  .3  0    Awrittendescriptionoftherequiredmaintenanceburdenforanyproposedstormwater   managementfacility..3E$F݌ (#(# Ќ   .3   .35G2U  5  .3  0    The (jurisdictionalstormwaterauthority) mayalsorequireaconceptplantoconsider   themaximumdevelopmentpotentialofasiteunderexistingzoning,regardlessofwhethertheapplicantpresentlyintendstodevelopthesitetoitsmaximumpotential..35G`G݌ (#(# Ќ  Fordevelopmentorredevelopmentoccurringonapreviouslydevelopedsite,anapplicantshallberequiredtoincludewithinthestormwaterconceptplanmeasuresforcontrollingexistingstormwaterrunoffdischargesfromthesiteinaccordancewiththestandardsofthisOrdinancetothemaximumextentpracticable.*XXXX o #XXX*XFJ#7.3.0  FinalStormwaterManagementPlanRequirementsp(#(# Afterreviewofthestormwatermanagementconceptplan,andmodificationstothatplanasdeemednecessarybythe (jurisdictionalstormwaterauthority) ,afinalstormwater q managementplanmustbesubmittedforapproval.Thefinalstormwatermanagementplan,inadditiontotheinformationfromtheconceptplan,shallincludealloftheinformationrequiredintheFinalStormwaterManagementPlanchecklistfoundintheStormwaterDesignManual.Thisincludes:1.0  ContactInformation\!B(#(# 0  Thename,address,andtelephonenumberofallpersonshavingalegalinterestinthepropertyandthetaxreferencenumberandparcelnumberofthepropertyorpropertiesaffected. (#(# 2.0  TopographicBaseMap^%D!"(#(# 0  A1"=200'topographicbasemapofthesitewhichextendsaminimumof򀀀feet o&U"# beyondthelimitsoftheproposeddevelopmentandindicatesexistingsurfacewaterdrainageincludingstreams,ponds,culverts,ditches,andwetlands*XXXX;currentlanduse O(5$% includingallexistingstructures#XXX*XMO#;locationsofutilities,roads,andeasements;and ?)%%& significantnaturalandmanmadefeaturesnototherwiseshown. (#(#  @+&'( 3.0  Calculations(#(# 0  Hydrologicandhydraulicdesigncalculationsforthepredevelopmentandpostdevelopmentconditionsforthedesignstormsspecifiedinthisordinance.Suchcalculationsshallinclude(i)descriptionofthedesignstormfrequency,intensityandduration,(ii)timeofconcentration,(iii)SoilCurveNumbersorrunoffcoefficients,(iv)peakrunoffratesandtotalrunoffvolumesforeachwatershedarea,(v)infiltrationrates,whereapplicable,(vi)culvertcapacities,(vii)flowvelocities,(viii)dataontheincreaseinrateandvolumeofrunoffforthedesignstormsreferencedintheStormwaterDesignManual,and(ix)documentationofsourcesforallcomputationmethodsandfieldtestresults. (#(# 4.0  SoilsInformation (#(# 0  Ifastormwatermanagementcontrolmeasuredependsonthehydrologicpropertiesofsoils(e.g.,infiltrationbasins),thenasoilsreportshallbesubmitted.Thesoilsreportshallbebasedononsiteboringlogsorsoilpitprofiles.Thenumberandlocationofrequiredsoilboringsorsoilsitsshallbedeterminedbasedonwhatisneededtodeterminethesuitabilityanddistributionofsoiltypespresentatthelocationofthecontrolmeasure. (#(# 5.0  MaintenanceandRepairPlan(#(# 0  Thedesignandplanningofallstormwatermanagementfacilitiesshallincludedetailedmaintenanceandrepairprocedurestoensuretheircontinuedfunction.Theseplanswillidentifythepartsorcomponentsofastormwatermanagementfacilitythatneedtobemaintainedandtheequipmentandskillsortrainingnecessary.Provisionsfortheperiodicreviewandevaluationoftheeffectivenessofthemaintenanceprogramandtheneedforrevisionsoradditionalmaintenanceproceduresshallbeincludedintheplan. (#(# L h((L .3   .3X2  6  .3  0    Landscapingplan.3XX݌pV(#(# Ќ  0  Theapplicantmustpresentadetailedplanformanagementofvegetationatthesiteafterconstructionisfinished,includingwhowillberesponsibleforthemaintenanceofvegetationatthesiteandwhatpracticeswillbeemployedtoensurethatadequatevegetativecoverispreserved.Thisplanmustbepreparedbyaregisteredlandscapearchitectorbythesoilconservationdistrict. (#(#  .3   .3[2  7  .3  0    MaintenanceEasements.3[.[݌R 8(#(# Ќ  0  Theapplicantmustensureaccesstoallstormwatertreatmentpracticesatthesiteforthepurposeofinspectionandrepairbysecuringallthemaintenanceeasementsneededonapermanentbasis.Theseeasementswillberecordedwiththeplanandwillremainineffectevenwithtransferoftitletotheproperty. (#(#  .3   .3<]2  8  .3  0    MaintenanceAgreement.3<]g]݌D%*!"(#(# Ќ  0  Theapplicantmustexecuteaneasementandaninspectionandmaintenanceagreementbindingonallsubsequentownersoflandservedbynaonsitestormwatermanagementmeasureinaccordancewiththespecificationsofthisordinance. (#(#  .3   .3"_2  9  .3  0    ErosionandSedimentControlPlansforConstructionofStormwaterManagement F),%& Measures.3"_M_݌ (#(# Ќ  0  Theapplicantmustprepareanerosionandsedimentcontrolplanforallconstructionactivitiesrelatedtoimplementinganyonsitestormwatermanagementpractices.7,()(#(#  .3   .3a2  10  .3  0    OtherEnvironmentalPermits.3aEa݌(#(# Ќ  0  Theapplicantshallassurethatallotherapplicableenvironmentalpermitshavebeenacquiredforthesitepriortoapprovalofthefinalstormwaterdesignplan. (#(# 7.4.0  PerformanceBond/Security=#(#(# The (jurisdictionalstormwaterauthority) may,atitsdiscretion,requirethesubmittalofa N 4 performancesecurityorbondpriortoissuanceofapermitinordertoinsurethatthestormwaterpracticesareinstalledbythepermitholderasrequiredbytheapprovedstormwatermanagementplan.Theamountoftheinstallationperformancesecurityshallbethetotalestimatedconstructioncostofthestormwatermanagementpracticesapprovedunderthepermit,plus25%.Theperformancesecurityshallcontainforfeitureprovisionsforfailuretocompleteworkspecifiedinthestormwatermanagementplan.Theinstallationperformancesecurityshallbereleasedinfullonlyuponsubmissionof"asbuiltplans"andwrittencertificationbyaregisteredprofessionalengineerthatthestormwaterpracticehasbeeninstalledinaccordancewiththeapprovedplanandotherapplicableprovisionsofthisordinance.The (jurisdictionalstormwaterauthority) willmakeafinalinspectionofthe  stormwaterpracticetoensurethatitisincompliancewiththeapprovedplanandtheprovisionsofthisordinance.Provisionsforapartialproratareleaseoftheperformancesecuritybasedonthecompletionofvariousdevelopmentstagescanbedoneatthediscretionofthe (jurisdictional  stormwaterauthority) . u  !XX#XX! h#Ԁ"& %XX"Somecommunitieselecttoalsorequireamaintenanceperformancesecurity.Thisbondtypicallyis  setatthemaintenancecostsestimatedinthestormwaterplanfortheperiodduringwhichthepermitholderhasmaintenanceresponsibilityandisreleasedwhentheresponsibilityforpracticemaintenanceispassedontoanotherparty,viaanapprovedmaintenanceagreement."#XX %&h#""  " XX Section8 #XX j#.0 `  XXConstructionInspection#XX 7k# ` (#` (# 8.1.0  NoticeofConstructionCommencement(#(# Theapplicantmustnotifythe (jurisdictionalstormwaterauthority) inadvancebeforethe   commencementofconstruction.Regularinspectionsofthestormwatermanagementsystemconstructionshallbeconductedbythestaffofthe (jurisdictionalstormwaterauthority) or ! certifiedbyaprofessionalengineerortheirdesigneewhohasbeenapprovedbythejurisdictionalstormwaterauthority.Allinspectionsshallbedocumentedandwrittenreportspreparedthatcontainthefollowinginformation: L aգ((hL .3   .3n2գ  1  .3  0    Thedateandlocationoftheinspection;.3nn݌%!"(#(# Ќ   .3   .3o2գ  2  .3  0    Whetherconstructionisincompliancewiththeapprovedstormwatermanagementplan.3oo݌&"#(#(# Ќ   .3   .3p2գ  3  .3  0    Variationsfromtheapprovedconstructionspecifications.3pp݌'#$(#(# Ќ   .3   .3q2գ  4  .3  0    Anyviolationsthatexist.3qq݌ )$%(#(# Ќ  Ifanyviolationsarefound,thepropertyownershallbenotifiedinwritingofthenatureofthe violationandtherequiredcorrectiveactions.Noaddedworkshallproceeduntilanyviolations  +&' arecorrectedandallworkpreviouslycompletedhasreceivedapprovalbythe (jurisdictional  stormwaterauthority) .    8.2.0  AsBuiltPlans,(#(# Allapplicantsarerequiredtosubmitactual asbuiltplansforanystormwatermanagementpracticeslocatedonsiteafterfinalconstructioniscompleted.Theplanmustshowthefinaldesignspecificationsforallstormwatermanagementfacilitiesandmustbecertifiedbyaprofessionalengineer.Afinalinspectionbythe (jurisdictionalstormwaterauthority) is   requiredbeforethereleaseofanyperformancesecuritiescanoccur.8.3.0  LandscapingandStabilizationRequirements (#(# Anyareaoflandfromwhichthenaturalvegetativecoverhasbeeneitherpartiallyorwhollyclearedorremovedbydevelopmentactivitiesshallberevegetatedwithinten(10)daysfromthesubstantialcompletionofsuchclearingandconstruction.Thefollowingcriteriashallapplytorevegetationefforts:0  Reseedingmustbedonewithanannualorperennialcovercropaccompaniedbyplacementofstrawmulchoritsequivalentofsufficientcoveragetocontrolerosionuntilsuchtimeasthecovercropisestablishedoverninetypercent(90%)oftheseededarea. (#(# 0  Replantingwithnativewoodyandherbaceousvegetationmustbeaccompaniedbyplacementofstrawmulchoritsequivalentofsufficientcoveragetocontrolerosionuntiltheplantingsareestablishedandarecapableofcontrollingerosion. (#(# 0  Anyareaofrevegetationmustexhibitsurvivalofaminimumofseventyfivepercent(75%)ofthecovercropthroughouttheyearimmediatelyfollowingrevegetation.Revegetationmustberepeatedinsuccessiveyearsuntiltheminimumseventyfivepercent(75%)survivalforone(1)yearisachieved.*XXXXԀ#XXX*X{#(#(# Inadditiontotheaboverequirements,alandscapingplanmustbesubmittedwiththefinaldesigndescribingthevegetativestabilizationandmanagementtechniquestobeusedatasiteafterconstructioniscompleted.Thisplanwillexplainnotonlyhowthesitewillbestabilizedafterconstruction,butwhowillberesponsibleforthemaintenanceofvegetationatthesiteandwhatpracticeswillbeemployedtoensurethatadequatevegetativecoverispreserved.Thisplanmustbepreparedbyaregisteredlandscapearchitectorbythesoilconservationdistrict,andmustbeapprovedpriortoreceivingapermit. XX Section9.0 ` *  MaintenanceandRepairofStormwaterFacilities #*XX *}#%!"` (#` (# #XXX*X$~# !XX#XX! ~#Ԁ"& %XX"Amodeloperationandmaintenanceordinanceforstormwaterfacilitiesis"also"availableat"the &"# SMRC""this"website.Thisordinancegoesintogreaterdetailontheelementsneededtocreateaneffectivestormwatermaintenanceordinance.Requirementsforinspectionarealsoincludedinthemodel."#XX %&)#"*XXXX" ($% " 1,(( #XXX*XӀ#*XXXX9.1.0  MaintenanceEasement(#(# #XXX*XN#Priortotheissuanceofanypermitthathasanstormwatermanagementfacilityasoneofthe + requirementsofthepermit,theapplicantorownerofthesitemustexecuteamaintenanceeasementagreementthatshallbebindingonallsubsequentownersoflandservedbythestormwatermanagementfacility.Theagreementshallprovideforaccesstothefacilityatreasonabletimesforperiodicinspectionbythe (jurisdictionalstormwaterauthority) ,ortheir  contractororagent,andforregularorspecialassessmentsofpropertyownerstoensurethatthefacilityismaintainedinproperworkingconditiontomeetdesignstandardsandanyotherprovisionsestablishedbythisordinance.Theeasementagreementshallberecordedbythe (jurisdictionalstormwaterauthority) inthelandrecords.*XXXX    #XXX*X(#9.2.0  MaintenanceCovenants (#(# Maintenanceofallstormwatermanagementfacilitiesshallbeensuredthroughthecreationofaformalmaintenancecovenantthatmustbeapprovedbythe (jurisdictionalstormwater   authority) andrecordedintothelandrecordpriortofinalplanapproval.Aspartofthe   covenant,ascheduleshallbedevelopedforwhenandhowoftenmaintenancewilloccurtoensureproperfunctionofthestormwatermanagementfacility.Thecovenantshallalsoincludeplansforperiodicinspectionstoensureproperperformanceofthefacilitybetweenscheduledcleanouts.The (jurisdictionalstormwaterauthority) ,inlieuofanmaintenancecovenant,mayaccept u dedicationofanyexistingorfuturestormwatermanagementfacilityformaintenance,providedsuchfacilitymeetsalltherequirementsofthischapterandincludesadequateandperpetualaccessandsufficientarea,byeasementorotherwise,forinspectionandregularmaintenance.9.3.0  RequirementsforMaintenanceCovenantsg(#(# Allstormwatermanagementfacilitiesmustundergo,attheminimum,anannualinspectiontodocumentmaintenanceandrepairneedsandensurecompliancewiththerequirementsofthisordinanceandaccomplishmentofitspurposes.Theseneedsmayinclude;*XXXXremovalofsilt,litter rX andotherdebrisfromallcatchbasins,inletsanddrainagepipes,grasscuttingandvegetationremoval,andnecessaryreplacementoflandscapevegetation.#XXX*X#ԀAnymaintenanceneedsfound R 8 mustbeaddressedinatimelymanner,asdeterminedbythe (jurisdictionalstormwater B!( authority) ,andtheinspectionandmaintenancerequirementmaybeincreasedasdeemed 2" necessarytoensureproperfunctioningofthestormwatermanagementfacility.9.4.0  InspectionofStormwaterFacilitiesD%*!"(#(# Inspectionprogramsmaybeestablishedonanyreasonablebasis,includingbutnotlimitedto:routineinspections;randominspections;inspectionsbaseduponcomplaintsorothernoticeofpossibleviolations;inspectionofdrainagebasinsorareasidentifiedashigherthantypicalsourcesofsedimentorothercontaminantsorpollutants;inspectionsofbusinessesorindustriesofatypeassociatedwithhigherthanusualdischargesofcontaminantsorpollutantsorwithdischargesofatypewhicharemorelikelythanthetypicaldischargetocauseviolationsofstateorfederalwaterorsedimentqualitystandardsortheNPDESstormwaterpermit;andjoint +') inspectionswithotheragenciesinspectingunderenvironmentalorsafetylaws.Inspectionsmayinclude,butarenotlimitedto:reviewingmaintenanceandrepairrecords;samplingdischarges,surfacewater,groundwater,andmaterialorwaterindrainagecontrolfacilities;andevaluatingtheconditionofdrainagecontrolfacilitiesandotherstormwatertreatmentpractices.9.5.0  RightofEntryforInspection (#(# Whenanynewdrainagecontrolfacilityisinstalledonprivateproperty,orwhenanynewconnectionismadebetweenprivatepropertyandapublicdrainagecontrolsystem,sanitarysewerorcombinedsewer,thepropertyownershallgranttothe (jurisdictionalstormwater   authority) therighttoenterthepropertyatreasonabletimesandinareasonablemannerforthe    purposeofinspection.Thisincludestherighttoenterapropertywhenithasareasonablebasistobelievethataviolationofthisordinanceisoccurringorhasoccurred,andtoenterwhennecessaryforabatementofapublicnuisanceorcorrectionofaviolationofthisordinance.9.6.0  RecordsofInstallationandMaintenanceActivities. (#(# Partiesresponsiblefor*XXXXԀtheoperationandmaintenanceofastormwatermanagementfacility#XXX*Xt#Ԁshall  makerecordsoftheinstallationandofallmaintenanceandrepairs,andshallretaintherecordsforatleast򀀀years.Theserecordsshallbemadeavailabletothe(jurisdictionalstormwater  authority)duringinspectionofthefacilityandatotherreasonabletimesuponrequest.9.70  FailuretoMaintainPractices(#(# Ifaresponsiblepartyfailsorrefusestomeettherequirementsofthemaintenancecovenant,the (jurisdictionalstormwaterauthority) ,afterreasonablenotice,maycorrectaviolationofthe  designstandardsormaintenanceneedsbyperformingallnecessaryworktoplacethefacilityinproperworkingcondition.Intheeventthatthestormwatermanagementfacilitybecomesadangertopublicsafetyorpublichealth,the (jurisdictionalstormwaterauthority) shallnotify  thepartyresponsibleformaintenanceofthestormwatermanagementfacilityinwriting.Uponreceiptofthatnotice,theresponsiblepersonshallhave򀀀daystoeffectmaintenanceandrepair y ofthefacilityinanapprovedmanner.Afterpropernotice,the (jurisdictionalstormwater i authority) mayassesstheowner(s)ofthefacilityforthecostofrepairworkandanypenalties; s Y andthecostoftheworkshallbealienontheproperty,orproratedagainstthebeneficialusersoftheproperty,andmaybeplacedonthetaxbillandcollectedasordinarytaxesbythecounty.  XXSection10.0 ` EnforcementandPenalties. #XX B#u$[ !` (#` (# 10.1.0  Violations&"#(#(# AnydevelopmentactivitythatiscommencedorisconductedcontrarytothisOrdinance,mayberestrainedbyinjunctionorotherwiseabatedinamannerprovidedbylaw."" +'( 10.2.0  NoticeofViolation.(#(# Whenthe (jurisdictionalstormwaterauthority) determinesthatanactivityisnotbeingcarried + outinaccordancewiththerequirementsofthisOrdinance,itshallissueawrittennoticeofviolationtotheowneroftheproperty.Thenoticeofviolationshallcontain:(1)thenameandaddressoftheownerorapplicant;(2)theaddresswhenavailableoradescriptionofthebuilding,structureorlanduponwhichtheviolationisoccurring;(3)astatementspecifyingthenatureoftheviolation;(4)adescriptionoftheremedialmeasuresnecessarytobringthedevelopmentactivityintocompliancewiththisOrdinanceandatimescheduleforthecompletionofsuchremedialaction;(5)astatementofthepenaltyorpenaltiesthatshallormaybeassessedagainstthepersontowhomthenoticeofviolationisdirected;(6)astatementthatthedeterminationofviolationmaybeappealedtothemunicipalitybyfilingawrittennoticeofappealwithinfifteen(15)daysofserviceofnoticeofviolation. XX 1  #XX 3#10.3.0  StopWorkOrdersS9(#(# Personsreceivinganoticeofviolationwillberequiredtohaltallconstructionactivities.This stopworkorderwillbeineffectuntilthe (jurisdictionalstormwaterauthority) confirmsthat T: thedevelopmentactivityisincomplianceandtheviolationhasbeensatisfactorilyaddressed.Failuretoaddressanoticeofviolationinatimelymannercanresultincivil,criminal,ormonetarypenaltiesinaccordancewiththeenforcementmeasuresauthorizedinthisordinance.10.4.0  CivilandCriminalPenaltiesF,(#(# Inadditiontoorasanalternativetoanypenaltyprovidedhereinorbylaw,anypersonwhoviolatestheprovisionsofthisOrdinanceshallbepunishedbyafineofnotlessthan򀀀 G- Dollars($xx)orbyimprisonmentforaperiodnottoexceed򀀀(xx)days,orbothsuchfineand 7 imprisonment.Suchpersonshallbeguiltyofaseparateoffenseforeachdayduringwhichtheviolationoccursorcontinues.10.4.0  Restorationoflands9!(#(# Anyviolatormayberequiredtorestorelandtoitsundisturbedcondition.Intheeventthatrestorationisnotundertakenwithinareasonabletimeafternotice,the (jurisdictional :#  stormwaterauthority) maytakenecessarycorrectiveaction,thecostofwhichshallbecomea *$  lienuponthepropertyuntilpaid.10.5.0  HoldsonOccupationPermits<'"##(#(# Occupationpermitswillnotbegranteduntilacorrectionstoallstormwaterpracticeshavebeenmadeandacceptedbythe (jurisdictionalstormwaterauthority) . =)#%% Approvedby:_________________________________"Date___________________" _+E'' "Date___________________"""References   $!Collins,A.,D.Walling,andG.Leeks.1997.SourceTypeAscriptionforFluvialSuspendedSedimentBasedonaQuantitativeCompositeFingerprintingTechnique.Catena,29:127MacRae,C.1993.Analternatedesignapproachforthecontrolofinstreamerosionpotentialinurbanizingwatersheds.pp.10861091.InproceedingsoftheSixthInternationalConferenceonUrbanStormDrainage.NiagraFalls,Ontario.MarsalekandTorno(eds.)MaineDept.ofEnvironmentalProtection(MDEP).1992.PhosphorusControlinLakeWatersheds:ATechnicalGuidetoEvaluatingNewDevelopment.Augusta,Maine.MarylandDepartmentoftheEnvironment(MDE).2000.MarylandStormwaterDesignManual.Baltimore,MD.Neller,1988.AcomparisonofChannelErosioninSmallUrbanandRuralCatchments,Armidale,NewSouthWales.EarthSurfaceProcessesandLandforms,13(1):17Tapley,T,W.JenkinsandR.Gardner.1996.ManagingStormwaterRunoff:ANewDirection.pp.864866.ProceedingsofWatershed'96.WaterEnvironmentFederation.UnitedStatesEnvironmentalProtectionAgency.1993.GuidanceSpecifyingManagementMeasuresforSourcesifNonpointPollutioninCoastalWaters.EPA840B92002.USEPA,OfficeofWater,Washington,D.C.UnitedStatesDepartmentofAgriculture(USDA).NaturalResourcesConservationService(NRCS).1986.TechnicalRelease55:UrbanHydrologyforSmallWatersheds,2ndEdition.Washington,D.C.Walling,D.E.andJ.C.Woodward.1995.TracingSourcsofSuspendedSedimentinRiverBasins:ACaseStudyoftheRiverCulm,Devon,UK.MarineandFreshwaterResearch,46:324336.