Designation:D6452−99(Reapproved2012)´1StandardGuideforPurgingMethodsforWellsUsedforGroundwaterQualityInvestigations1ThisstandardisissuedunderthefixeddesignationD6452;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditorialchangesweremadethroughoutinJuly2012.1.Scope1.1Thisguidecoversmethodsforpurgingwellsusedforgroundwaterqualityinvestigationsandmonitoringprograms.Thesemethodscouldbeusedforothertypesofprogramsbutarenotaddressedinthisguide.1.2Thisguideappliesonlytowellssampledatthewell-head.1.3Thisstandarddescribessevenmethods(A-G)fortheselectionofpurgingmethods.MethodA—FixedVolumePurging,MethodB—PurgingBasedonStabilizationofIndi-catorParameters,MethodC—PurgingBasedonStabilizationofTargetAnalytes,MethodD—PurgingBasedonFixedVolumeCombinedwithIndicatorParameterStabilization,MethodE—LowFlow/LowVolume(MinimalDrawdown)Purging,MethodF—WellEvacuationPurging,andMethodG—UseofPackersinPurging.1.4Thisguideoffersanorganizedcollectionofinformationoraseriesofoptionsanddoesnotrecommendaspecificcourseofaction.Thisdocumentcannotreplaceeducationorexperienceandshouldbeusedinconjunctionwithprofessionaljudgment.Notallaspectsofthisguidemaybeapplicableinallcircumstances.ThisASTMstandardisnotintendedtorepre-sentorreplacethestandardofcarebywhichtheadequacyofagivenprofessionalservicemustbejudged,norshouldthisdocumentebeappliedwithoutconsiderationofaproject’smanyuniqueaspects.Theword“Standard”inthetitleofthisguidemeansonlythatthedocumenthasbeenapprovedthroughtheASTMconsensusprocess.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D653Te...
