Designation:D4700−15StandardGuideforSoilSamplingfromtheVadoseZone1ThisstandardisissuedunderthefixeddesignationD4700;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThisstandardwasdevelopedin1991andhasnotundergoneatechnicalrevision.Sincethattime,manyotherguidesandpracticesweredevelopedintheresponsetotheneedforimprovedenvironmentalexplorationmethods.TherearenewguidesforSoilandRocksamplingandMechanicalDrilling.NewDirectPushandSonicmethodsweredeveloped.Therevisionofthisstandardwilladdallthenewrelatedstandardsbuttherewillnotbesignificantadditionsordeletionstotheoriginalcontent.Theuserwillbedirectedtotherelatedstandards.1.Scope1.1Thisguidecoversproceduresthatmaybeusedforobtainingsoilsamplesfromthevadosezone(unsaturatedzone).Samplescanbecollectedforavarietyofreasonsincludingthefollowing:1.1.1Stratigraphicdescription,1.1.2Hydraulicconductivitytesting,1.1.3Moisturecontentmeasurement,1.1.4Moisturereleasecurveconstruction,1.1.5Geotechnicaltesting,1.1.6Soilgasanalyses,1.1.7Microorganismextraction,1.1.8Poreliquidevaluation,or1.1.9Laboratorychemicalanalysisidentifyingcontaminanttypesandconcentrationswithinsoils.1.2GuidesD6169onSelectionofSoilandRockSamplingDevicesandD6282onDrillingmethodsforEnvironmentalSiteCharacterizationprovidesubsequentsupplementalinfor-mationtothecontentsofthisstandard.1.2.1DirectPushSoilSampling(GuideD6282)andSonicDrillingforSiteCharacterization(PracticeD6914)areusedextensivelyforenvironmentalsoilsamplingintheVadosezone.1.3SubsurfaceexplorationsaredocumentedinaccordancewithD5434onLoggingofSubsurfaceExplorations.1.4SoilcoremayrequireprocessingusingPracticeD6640onCollectionandHandlingofSoilCoresforEnvironmentalExplorations.1.5Thisguidefocusesonmethodsthatprovidesoilsamplesforchemicalanalysesofthesoilorcontainedliquidsorcontaminants.Howeve...
