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g) Areaswithin1,000feetupgradientor100feetdowngradientofactivekarst <br />features;and <br />h) Areasthatreceiverunofffromthefollowingindustrialfacilitiesnotauthorizedto <br />infiltratestormwaterundertheNPDESstormwaterpermitforindustrialactivities: <br />i. Automobilesalvageyards; <br />ii. Scraprecyclingandwasterecyclingfacilities; <br />iii. Hazardouswastetreatment,storage,ordisposalfacilities; <br />iv. Woodpreservingfacilities;or <br />v. Airtransportationfacilitiesthatconductdeicingactivities. <br />ii. FiltrationSystem <br />1) Filtrationoptionsinclude,butarenotlimitedto:sandfilterswithunderdrains,biofiltration <br />areas,swalesusingunderdrainswithimpermeablecheckdamsandundergroundsand <br />filters; <br />2) Mustnotinstallfiltermediauntilthecontributingdrainageareaisconstructedandfully <br />stabilizedunlesstheyproviderigorouserosionpreventionandsedimentcontrols(e.g., <br />diversionberms)tokeepsedimentandrunoffcompletelyawayfromthefiltrationarea; <br />3) Designedtoremoveatleast80percentofTSS; <br />4) Mustuseapretreatmentdevicesuchasavegetatedfilterstrip,smallsedimentation <br />basin,waterqualityinlet,forebayorhydrodynamicseparatortoremovesettleablesolids, <br />floatingmaterials,andoilsandgreasefromtherunofftothemaximumextentpracticable, <br />beforerunoffentersthefiltrationsystem; <br />5) DesignedtoprovideawaterqualityvolumeasdescribedinSection3.b.iii,3.b.iv,and3.b.v; <br />6) Designedtodischargeallstormwater(includingstormwaterinexcessofthewaterquality <br />volume)routedtothesystemthroughtheuppermostsoilsurfaceorengineeredmedia <br />surfacewithin48hours.Additionalflowsthatthesystemcannotfilterwithin48hours <br />mustbypassthesystemordischargethroughanemergencyoverflow; <br />7) Designedtoprovideameanstovisuallyverifythesystemisdischargingthroughthesoil <br />surfaceorfiltermediawithin48hours; <br />8) Employappropriateonsitetestingtoensureaminimumofthree(3)feetofseparation <br />betweentheseasonallysaturatedsoils(orfrombedrock)andthebottomoftheproposed <br />filtrationsystem; <br />9) Constructwithanimpermeablelinerwhenthesystemhaslessthanthree(3)feetof <br />separationbetweenseasonallysaturatedsoilsorbedrock; <br />10) Designedwithamaintenanceaccess,typicallyeight(8)feetwide. <br />iii. WetSedimentationBasin <br />1) Permanentvolumeof1,800cubicfeetofstoragebelowtheoutletpipeforeachacrethat <br />drainstothebasin; <br />2) Permanentvolumemustreachaminimumdepthofatleastthree(3)feetandmusthave <br />nodepthgreaterthan10feet; <br />3) Mustbeconfiguredtominimizescourorresuspensionofsolids; <br />4) Inadditiontothepermanentvolume,thebasinmustprovidethewaterqualityvolumeas <br />livestorage.WaterqualityvolumeisdescribedinSection3.b.iii,3.b.iv,and3.b.v; <br />March2024|wqstrm498 <br />Page 20 of 23 <br /> <br />