Designation:D6286/D6286M−20StandardGuideforSelectionofDrillingandDirectPushMethodsforGeotechnicalandEnvironmentalSubsurfaceSiteCharacterization1ThisstandardisissuedunderthefixeddesignationD6286/D6286M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisguideprovidesdescriptionsofvariousmethodsforsitecharacterizationalongwithadvantagesanddisadvantagesassociatedwitheachmethoddiscussed.Thisguideisintendedtoaidintheselectionofdrillingmethod(s)forgeotechnicalandenvironmentalsoilandrockboringsforsampling,testing,andinstallationofwells,orotherinstrumentation.Itdoesnotaddressdrillingforfoundationimprovement,drinkingwaterwells,orspecialhorizontaldrillingtechniquesforutilities.1.2Thisguidecannotaddressallpossiblesubsurfacecon-ditionsthatmayoccursuchas,geologic,topographic,climatic,oranthropogenic.Siteevaluationforengineering,design,andconstructionpurposesisaddressedinGuideD420.SoilandrocksamplingindrillholesisaddressedinGuideD6169/D6169M.Pertinentguidesandpracticesaddressingspecificdrillingmethods,equipment,andproceduresarelistedinSection2.GuideD5730providesinformationonmostallaspectsofenvironmentalsitecharacterization.1.3ThevaluesstatedineitherSIunitsorinch-poundunits(giveninbrackets)aretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnoncon-formancewiththestandard.1.4Thisguidedoesnotpurporttocomprehensivelyaddressallmethodsandtheissuesassociatedwithdrillingforgeotech-nicalandenvironmentalpurposes.Usersshouldseekqualifiedprofessionalsfordecisionsastotheproperequipmentandmethodsthatwouldbemostsuccessfulfortheirsiteinvesti-gation.Othermethodsmaybeavailableforthesemethodsandqualifiedprofessionalsshouldhaveflexibilitytoexercise...
