Designation:D5299−99(Reapproved2012)´1StandardGuideforDecommissioningofGroundwaterWells,VadoseZoneMonitoringDevices,Boreholes,andOtherDevicesforEnvironmentalActivities1ThisstandardisissuedunderthefixeddesignationD5299;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditorialchangesweremadethroughoutinFebruary2012.1.Scope1.1Thisguidecoversproceduresthatarespecificallyre-latedtopermanentdecommissioning(closure)ofthefollowingasappliedtoenvironmentalactivities.Itisintendedforusewheresolidorhazardousmaterialsorwastesarefound,orwhereconditionsoccurrequiringtheneedfordecommission-ing.Thefollowingdevicesareconsideredinthisguide:1.1.1Aboreholeusedforgeoenvironmentalpurposes(seeNote1),1.1.2Monitoringwells,1.1.3Observationwells,1.1.4Injectionwells(seeNote2),1.1.5Piezometers,1.1.6Wellsusedfortheextractionofcontaminatedgroundwater,theremovaloffloatingorsubmergedmaterialsotherthanwatersuchasgasolineortetrachloroethylene,orotherdevicesusedfortheextractionofsoilgas,1.1.7Aboreholeusedtoconstructamonitoringwell,and1.1.8Anyothervadosezonemonitoringdevice.1.2Temporarydecommissioningoftheaboveisnotcov-eredinthisguide.NOTE1—Thisguidemaybeusedtodecommissionboreholeswherenocontaminationisobservedatasite(seePracticeD420fordetails);however,theprimaryuseoftheguideistodecommissionboreholesandwellswheresolidorhazardouswastehavebeenidentified.Methodsidentifiedinthisguidecanalsobeusedinothersituationssuchasthedecommissioningofwatersupplywellsandboreholeswherewatercontaminatedwithnonhazardouspollutants(suchasnitratesorsulfates)arepresent.Thisguideshouldbeconsultedintheeventthataroutinegeotechnicalinvestigationindicatesthepresenceofcontaminationatasite.NOTE2—Theterm“well”isusedinthisguidetodenotemonitoringwells,piezometers,orotherdevicesconstructedinamannersimilartoawell.Some...
