Designation:D7648/D7648M−18StandardPracticeforActiveSoilGasSamplingforDirectPushorManual-DrivenHand-SamplingEquipment1ThisstandardisissuedunderthefixeddesignationD7648/D7648M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticedetailsthecollectionofactivesoilgassamplesusingavarietyofsamplecollectiontechniqueswithtoolingassociatedwithdirectpushdrilling(DP)ormanual-drivenhand-samplingequipment,fortheexpresspurposeofconductingsoilgassurveys.1.2Thispracticeproceedsonthepremisethatsoilgassurveysareprimarilyusedfortwo(2)purposes:1)asapreliminarysiteinvestigativetooland2)forthemonitoringofongoingremediationactivities(D7663).1.3Thepracticalityoffieldusedemandsthatsoilgassurveysarerelativelyaccurate,aswellasbeingsimple,quick,andinexpensive.Thisguidesuggeststhattheobjectiveofsoilgassurveysislinkedtothreefactors:1.3.1VOCdetectionandquantitation,includingdetermina-tionofdepthofVOCcontamination.1.3.2Sampleretrievaleaseandtime.1.3.3Cost.1.4Thispracticemayincreasetheawarenessofafunda-mentaldifferencebetweensoilgassamplingforthepurposeofsoilgassurveysversussub-slaborvaporintrusioninvestiga-tionsorboth.Specifically,thepurposeofasoilgassurveyistoprovidequickandinexpensivedatatotheinvestigatorthatwillallowtheinvestigatorto1)developasiteinvestigationplanthatisstrategicinitsefforts,2)determinesuccessorprogressofon-goingremedialactivities,or3)selectthemostsuitablesubsequentinvestigationequipment,orcombinationsthereof.Ontheotherhand,theobjectiveofsoilgassamplingforsub-slabandvaporintrusioninvestigationsisnotpreliminary,butrathertheendresultofthesiteinvestigationorlong-termprecisemonitoring.Assuch,stringentsamplingmethodsandprotocolarenecessaryforprecisesamplesanddatacollection.1.5Detailsincludedinthispracticeincludeabroadspec-trumofpracticesandapplicationsofsoi...
