Designation:D6517−18StandardGuideforFieldPreservationofGroundWaterSamples1ThisstandardisissuedunderthefixeddesignationD6517;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisguidecoversmethodsforfieldpreservationofgroundwatersamplesfromthepointofsamplingthroughreceiptatthelaboratory.Laboratorypreservationmethodsarenotdescribedinthisguide.PurgingandsamplingtechniquesarenotaddressedinthisstandardbutareaddressedinGuidesD6564/D6564M,D6634/D6634M,D7929,andPracticeD6771.1.2Groundwatersamplesaresubjecttochemical,physical,andbiologicalchangerelativetoinsituconditionsatthegroundsurfacesduetoexposuretoambientconditionsduringsamplecollection.Physicalandchemicalpreservationofsamplesminimizefurtherchangesinsamplechemistrythatcanoccurfromthemomentthegroundwatersampleisretrieved,tothetimeitisremovedfromthesamplecontainerforextractionoranalysis.1.3Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisguideoffersanorganizedcollectionofinformationoraseriesofoptionsanddoesnotrecommendaspecificcourseofaction.Thisdocumentcannotreplaceeducationorexperienceandshouldbeusedinconjunctionwithprofessionaljudgment.Notallaspectsofthisguidemaybeapplicableinallcircumstances.ThisASTMstandardisnotintendedtorepre-sentorreplacethestandardofcarebywhichtheadequacyofagivenprofessionalservicemustbejudged,norshouldthisdocumentbeappliedwithoutconsiderationofaproject’smanyuniqueaspects.Theword“Standard”inthetitleofthisdocumentmeansonlythatthedocumenthasbeenapprovedthroughtheASTMconsensusprocess.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulato...
