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18) A50footnaturalbuffermustbepreservedor,ifabufferisinfeasibleonthesite, <br />redundant(double)perimetersedimentcontrolsmustbeprovidedwhenasurface <br />waterislocatedwithin50feetoftheproject'searthdisturbancesandstormwater <br />flowstothesurfacewater; <br />a) Permitteesmustinstallperimetersedimentcontrolsatleast5feetapartunless <br />limitedbylackofavailablespace; <br />b) Naturalbuffersarenotrequiredadjacenttoroadditches,judicialditches, <br />countyditches,stormwaterconveyancechannels,stormdraininlets,and <br />sedimentbasins; <br />c) Ifpreservingthebufferisinfeasible,thereasonsmustbedocumentedinthe <br />siteplan; <br />d) Sheetpilingandotherimpermeablebarriersinstalledinamannerthatretainsall <br />Stormwaterareconsideredredundantperimetercontrol. <br />19) Anundisturbedbufferzoneofnotlessthan100linearfeetmustbeincludedona <br />projectthatiswithinonemile(aerialradiusmeasurement)of,andflowstoͻƚƷŷĻƩ <br />specialǞğƷĻƩƭͼͲͻƦƩƚŷźĬźƷĻķǞğƷĻƩƭͼͲand/orͻƩĻƭƷƩźĭƷĻķǞğƷĻƩƭͼasdefined; <br />a) Thebufferzonemustbemaintainedatalltimes,bothduringconstructionand <br />asapermanentfeaturepostconstruction,exceptwhereawatercrossingor <br />otherencroachmentisnecessarytocompletetheproject; <br />b) Ifbufferencroachmentisnecessary,thecircumstance,reasons,andrestoration <br />activitiesmustbefullydocumentedinthesiteplan; <br />c) Allpotentialwaterquality,scenicandotherenvironmentalimpactsofthe <br />encroachmentsmustbeminimizedbytheuseofadditionalorredundant <br />(double)BMPs.AdditionalorredundantBMPsmustbedocumentedinthesite <br />plan. <br />20) Polymers,flocculants,orothersedimentationtreatmentchemicalsmustbeusedin <br />accordancewithacceptedengineeringpractices,dosingspecificationsandsediment <br />removaldesignspecificationsprovidedbythemanufacturerorsupplier. <br />21) Conventionalerosionandsedimentcontrolsmustbeusedpriortochemical <br />additionandmustdirecttreatedstormwatertoasedimentcontrolsystemfor <br />filtrationorsettlementoftheflocpriortodischarge. <br />iii. DewateringandBasinDraining <br />1) Turbidorsedimentladenwatersrelatedtodewateringorbasindraining(e.g., <br />pumpeddischarges,trench/ditchcutsfordrainage)mustbedischargedtoa <br />sedimentcontrol(e.g.sedimenttraporbasin,filterbag)designedtoprevent <br />dischargeswithvisualturbidity.Totheextentfeasible,usewellvegetated <br />(e.g.grassyorwooded)uplandareaofthesitetoinfiltratedewateringwater <br />beforedischarge; <br />2) Receivingwaterscannotbeusedaspartofatreatmentarea; <br />3) Dischargesfromdewateringactivitiesmustbevisuallycheckedand <br />photographedatthebeginningandatleastonceevery24hoursofoperationto <br />ensuretreatmenthasbeenobtainedandnuisanceconditionswillnotresultfrom <br />thedischarge.Dewateringactivitiesthatonlylastforminutes,asopposedto <br />hoursanddonot <br />reachasurfacewater,donotrequirephotographsor <br />documentation; <br />March2024|wqstrm498 <br />Page 10 of 23 <br /> <br />