Designation:D7758−11StandardPracticeforPassiveSoilGasSamplingintheVadoseZoneforSourceIdentification,SpatialVariabilityAssessment,Monitoring,andVaporIntrusionEvaluations1ThisstandardisissuedunderthefixeddesignationD7758;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Purpose—ThispracticecoversstandardizedtechniquesforpassivelycollectingsoilgassamplesfromthevadosezoneandistobeusedinconjunctionwithGuideD5314.1.2Objectives—Objectivesguidingthedevelopmentofthispracticeare:(1)tosynthesizeandputinwritinggoodcom-mercialandcustomarypracticeforconductingpassivesoilgassampling,(2)toensurethattheprocessforcollectingandanalyzingpassivesoilgassamplesispracticalandreasonable,and(3)toprovidestandardguidanceforpassivesoilgassamplingperformedinsupportofsourceidentification,spatialvariability/extentdeterminations,siteassessment,sitemonitoring,andvaporintrusioninvestigations.1.3Thispracticedoesnotaddressrequirementsofanyfederal,state,orlocalregulationsorguidanceorbothwithrespecttosoilgassampling.Usersarecautionedthatfederal,state,andlocalguidancemayimposespecificrequirementsthatdifferfromthoseofthispractice.1.4Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.6Thispracticeoffersasetofinstructionsforperformingoneormorespecificoperations.Thisdocumentcannotreplaceeducationorexperienceandshouldbeusedinconjunctionwithprofessionaljudgment.Notallaspectsofthispracticemaybeapplicableinallcircumstances.ThisASTMstandardisnotintendedtorepresentorreplacethestandardofcarebywhichthea...
