Designation:D5314−92(Reapproved2006)StandardGuideforSoilGasMonitoringintheVadoseZone1ThisstandardisissuedunderthefixeddesignationD5314;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversinformationpertainingtoabroadspectrumofpracticesandapplicationsofsoilatmospheresampling,includingsamplerecoveryandhandling,sampleanalysis,datainterpretation,anddatareporting.Thisguidecanincreasetheawarenessofsoilgasmonitoringpractitionersconcerningimportantaspectsofthebehaviorofthesoil-water-gas-contaminantsysteminwhichthismonitoringisperformed,aswellasinformthemofthevarietyofavailabletechniquesofeachaspectofthepractice.Appropriateapplicationsofsoilgasmonitoringareidentified,asarethepurposesofthevariousapplications.Emphasisisplacedonsoilgascontaminantdeterminationsincertainapplicationexamples.1.2Thisguidesuggestsavarietyofapproachesusefultosuccessfullymonitorvadosezonecontaminantswithinstruc-tionsthatofferdirectiontothosewhogenerateandusesoilgasdata.1.3Thisguidedoesnotrecommendastandardpracticetofollowinallcasesnordoesitrecommenddefinitecoursesofaction.Thesuccessofanyonesoilgasmonitoringmethodol-ogyisstronglydependentupontheenvironmentinwhichitisapplied.1.4Concernsofpractitionerliabilityorprotectionfromorreleasefromsuchliability,orboth,arenotaddressedbythisguide.1.5Thisguideisorganizedintothefollowingsectionsandsubsectionsthataddressspecificsegmentsofthepracticeofmonitoringsoilgas:Section4SummaryofPractice4.1Basicprinciples,includingpartitioningtheory,migrationandemplacementprocesses,andcontaminantdegradation4.7SummaryProcedure5SignificanceandUse6ApproachandProcedure6.1SamplingMethodology6.5SampleHandlingandTransport6.6AnalysisofSoilGasSamples6.7DataInterpretation7Reporting1.6Thisguidedoesnotpurporttosetstandardlevelsofacceptablerisk.Useofthisguideforpu...
