Oklahoma---Risk-Based-Cleanup-Levels-for-Total-Pet

AnalyticalMethodsToensureproficiencyinmethodperformanceandconsistentdataquality,theDEQprefersdatafromlaboratoriescertifiedbyeithertheStateofOklahomaorNationalEnvironmentalLaboratoryAccreditationConference(NELAC),orequivalent.AsshowninTable1,DEQrecommendsTexasmethod1005orequivalentforuseinpreliminaryTPHcharacterizationforsoil.Subsequentanalysis,includingdelineationandconfirmation,shouldbespecifictotheTPHrangeorrangespresentinthesoilmatrix.Forexample,ifpreliminaryTPHcharacterizationusingmethodTX1005detectedGROinsoil,subsequentsamplingshouldbeperformedwithanalyticalmethodOKGRO(8020/8015M).ThegroundwatermatrixshouldbeanalyzedwithOKGRO(8020/8015M)andOKDRO(8000/8100M).EquivalentanalyticalmethodsmustbeapprovedbyDEQ.Table1PreferredAnalyticalGRO(C6-C12)DRO(C12-C28)LubeOil(C28-C35)MethodsSoilGroundwaterSoilGroundwaterSoilGroundwaterTX1005X*XXNAOKGRO(8020/XXNA8015M)OKDRO(8000/XXNA8100M)NA–Notapplicable*UseofTX1005GROrangeisappropriateforpreliminaryTPHsoilcharacterizationonly.PurposeThisdocumentestablishesrisk-basedcleanupnumbersforsitesthathavepetroleumcontaminatedsoilandgroundwater.CleanupnumbersforTPHcanbeappliedafterproperscreeningdescribedbelow.Thesenumbersdonotapplytowaste,wastesourcesorsaturatedmedia.IntroductionTotalpetroleumhydrocarbons(TPH)isdefinedbytheOklahomaDepartmentofEnvironmentalQuality(DEQ)ascarbonrangeC6throughC35representingawidevarietyofcomplexmixturesofcompounds.DEQdefinesthreerangesofTPHasfollows:Gasolinerange(GRO)C6-C10Dieselrange(DRO)C11-C28LubeoilrangeC28-C35Theamountandtypesofcompoundsinapetroleumhydrocarbonreleasedifferwidelydependingontheproductspilledandhowitweathered.ThisvariabilitymakesitdifficulttodeterminethetoxicityandmobilityofweatheredpetroleumproductssolelyfromTPHresults;however,ananalysisofsoiland/orgroundwatercanbeusedtoapproximateriskdependingonthehydrocarbonrange,thereleasescenario,howwellthesitehasbeencharacterized,andtheintendeduseoftheland.Someconstituentswithintheserangeshavetoxicity-basedsoilcleanuplevels.Constituentsoflessertoxicitywillrequireacleanuplevelbasedonaestheticvaluesormobility.Risk-basedScreeningandRemediationManysiteshavenumerouscontaminantsofconcerninadditiontoTPHcontamination.DEQusesarisk-basedRisk-BasedCleanupLevelsforTotalPetroleumHydrocarbons(TPH)ContinuedonnextpageFactSheet|May2010approachonallsites.Ifasitehasanunknownrelease,thesitemustfirstbescreenedforthepresenceofvolatileorganiccompounds(VOCs),semi-volatileorganiccompounds(SVOCs),andmetals.Iftheseconstituentsarefoundbelowscreeninglevels,thenTPHconcentrationscanbequantifiedandDEQcleanuplevelsforthethreerespectiveTPHrangescanbeapplied.TheTPHcleanuplevelsarebasedonthemobilityoftheconstituentsandrelativetoxicityoftherespectivehydrocarbonrange.Cleanuplevelsvaryaccordingtoresidentialorindustrialscenarios.Thesubmittermustdefinethecurrentandplannedfutureuseofthesiteinordertoapplytheappropriatecleanupvalues. Table32a)SimpleSiteSpecificSimpleSiteSpecificTPHGROUNDWATERTop2feet2feetSOILCleanupLevels*(mg/L)SOIL(mg/kg)RESIDENTIALGRO(C6-C10)1.050.0500.0DRO(C11-C28)LubeOil(C28)INDUSTRIALGRO(C6-C10)500.0DRO(C11-C28)1.02500.0LubeOil(C28)5000.0*Individualrangespresentinthematrixmaynotexceedthecleanupvaluesperrange.TPHCleanupLevels-AThreeTieredApproach:Tier2:SiteSpecificIfTPHlevelsexceedTier1genericcleanuplevels,thesubmittermaycleanuptothegenericstandardorchoosetopursueTier2a,Tier2b,orTier3,however,DEQapprovalisTier1:GenericTable2Tier1GenericTPHCleanupLevelsGROUNDWATERSOILRESIDENTIAL1.0mg/L50.0mg/kgINDUSTRIAL1.0mg/L500.0mg/kg·TPHisdefinedasthetotalanalysisusedinTX1005.2b)-SiteSpecificTPHCleanupLevelsSite-specificparametersmaybeusedtoderivealternativecleanupvaluesuponapprovalbyDEQ.Thesubmittermayproposesite-specificparameterssuchas:soilporosity,soilbulkdensity,particledensity,soil-waterpartitioncoefficient,volumetricwatercontentofvadosezonesoils,fractionoforganiccarboninsoil,volumeofaircontentinvadosezonesoils,mixingzonedepth,aquiferhydraulicconductivity,hydraulicgradient,aquiferthickness,infiltrationrateandsourcelengthtoassessTPHimpact.DEQshallreviewandapprovetheseparametersandassumptionstoconfirmtheyareapplicabletothesite.ThispublicationisissuedbytheOklahomaDepartmentofEnvironmentalQualityauthorizedbySteveA.Thompson,ExecutiveDirector.Copieshavebeenpreparedatacostof$0.1035each.CopieshavebeendepositedwiththePublicationsClearinghouseoftheOklahomaDepartmentofLibraries.dh\factsheets\lpd\riskbasedcleanupforTPH5-09\TPH.indd5/27/2010DEQhasathree(3)tieredapproachtoTPHcleanup:generic(Table2),sitespecific(Table3),andquantitativeriskassessment.ThesetiersprovideflexibilityandeconomytosubmittersbyprovidingarangeofoptionsfromconservativegenericnumbersbasedontotalTPHanalysestomoreResources-HumanHealthMedium-SpecificScreeningLevels,USEPARegion6,://:/