Designation:D6564/D6564M−17StandardGuideforFieldFiltrationofGroundwaterSamples1ThisstandardisissuedunderthefixeddesignationD6564/D6564M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisguidecoversmethodsforfieldfiltrationofground-watersamplescollectedfromgroundwatermonitoringwells,excludingsamplesthatcontainnon-aqueousphaseliquids(eitherDenseNon-AqueousPhaseLiquids(DNAPLs)orLightNon-AqueousPhaseLiquids(LNAPLs)).Methodsoffieldfiltrationdescribedhereincouldalsobeappliedtosamplescollectedfromwellsusedforotherpurposes.Laboratoryfiltrationmethodsarenotdescribedinthisguide.1.2Thisguideprovidesproceduresavailableforfieldfiltra-tionofgroundwatersamples.Theneedforsamplefiltrationforspecificanalytesshouldbedefinedpriortothesamplingeventanddocumentedinthesite-specificsamplingandanalysisplaninaccordancewithGuideD5903.Thedecisionshouldbemadeonaparameter-specificbasiswithconsiderationofthedataqualityobjectivesofthesamplingprogram,anyapplicableregulatoryagencyguidelines,andanalyticalmethodrequire-ments.1.3Thisguideoffersanorganizedcollectionofinformationoraseriesofoptionsanddoesnotrecommendaspecificcourseofaction.Thisguidecannotreplaceeducationorexperienceandshouldbeusedinconjunctionwithprofessionaljudgment.Notallaspectsofthisguidemaybeapplicableinallcircum-stances.Thisguideisnotintendedtorepresentorreplacethestandardofcarebywhichtheadequacyofagivenprofessionalservicetobejudged,norshouldthisguidebeappliedwithoutconsiderationofthemanyuniqueaspectsofaproject.Theword“Standard”inthetitleofthisguidemeansonlythattheguidehasbeenapprovedthroughtheASTMconsensuspro-cess.1.4Units—ThevaluesstatedineitherSIUnitsorinch-poundunitsgiveninbracketsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindepend...
