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【英文标准名称】:StandardGuideforInstallationofDirectPushGroundWaterMonitoringWells
【原文标准名称】:直接推动式地下水监测井安装的标准指南
【标准号】:ASTMD6724-2004(2010)
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D18.21
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:directpush;groundwater;monitoringwell;siteinvestigatio;Directpushsampling;Drivenwellpoint;Environmentalsiteassessment(ESA);Ground-watermonitoring/sampling;Installation--groundwater/subsurfacedevices/applications;Jelledwellpoint;Pr
【摘要】:Thedirectpushgroundmethodisarapidandeconomicalprocedureforinstallinggroundwatermonitoringwellstoobtainrepresentativegroundwatersamplesandlocation-specifichydrogeologicmeasurements.Directpushinstallationsmayofferanadvantageoverconventionalrotarydrilledmonitoringwells(PracticeD5092)forgroundwaterinvestigationsinunconsolidatedformationsbecausetheyreducedisturbancetotheformation,andeliminateorminimizedrillcuttings.Atfacilitieswherecontaminatedsoilsarepresent,thiscanreducehazardexposureforoperators,localpersonnel,andtheenvironment,andcanreduceinvestigativederivedwastes.Additionally,smallerequipmentcanbeusedforinstallation,providingbetteraccesstoconstrictedlocations.Directpushmonitoringwellsgenerallydonotextendtodepthsattainablebydrilling.Theyarealsotypicallysmallerindiameterthandrilledwells,therebyreducingpurgewatervolumes,samplingtime,andinvestigativederivedwastes.PracticeD5092monitoringwellsareusedwhenlargerdiametersand/orsamplevolumesarerequired,oratdepthstowhichitisdifficulttoinstalldirectpushwells.Directpushmonitoringwellsshouldbeviableformonitoringformanyyears.Priortoconstructionandinstallationofadirectpushwelloranyothertypeofgroundwaterwellthereadershouldconsultappropriatelocalandstateagenciesregardingregulatoryrequirementsforwellconstructioninthestate.Aregulatoryvariancemayberequiredforinstallationofdirectpushmonitoringwellsinsomestates.Todate,publishedcomparisonstudiesbetweendrilledmonitoringwellsanddirectpushmonitoringwellshaveshowncomparability(1,2,3,4,5).However,selectionofdirectpushmonitoringwellsoverconventionalrotarydrilledwellsshouldbebasedonseveralcriteria,suchassiteaccessibilityandpenetrability,stratigraphicstructure,depthtogroundwater,andaquifertransmissivity.Typicalpenetrationdepthsforinstallationofgroundwatermonitoringwellswithdirectpushequipmentdependonmanyvariables.Someofthevariablesarethesizeandtypeofthedrivingsystem,diameterofthedriverodsandmonitoringwell,andtheresistanceoftheearthmaterialsbeingpenetrated.Somedirectpushsystemsarecapableofinstallinggroundwatermonitoringwellstodepthsinexcessof100feet,andlargerdirectpushequipment,suchasthevibratorysonictypedrill(GuideD6286)arecapableofreachingmuchgreaterdepths,sometimesinexcessof400ft.However,installationdepthsof10to50feetaremostcommon.Directpushmethodscannotbeusedtoinstallmonitoringwellsinconsolidatedbedrock(forexample,granite,limestone,gneiss),butareintendedforinstallationinunconsolidatedmaterialssuchasclays,silts,sands,andsomegravels.Additionally,depositscontainingsignificantcobblesandboulders(forexample,someglacialdeposits),orstronglycementedmaterials(forexample,caliche)arelikelytohinderorpreventpenetrationtothedesiredmonitoringdepth.Fordirectpushmethodstoprovideaccurategroundwatermonitoringresults,precautionsmustbetakentoensurethatcross-contaminationbyx201C;smearingx201D;orx201C;drag-downx201D;(thatis,drivingshallowcontaminationtodeeperlevels)doesnotoccur,andthathydraulicconnectionsbetweenotherwiseisolatedwaterbearingstrataarenotcreated.Similarprecautionsasthoseappliedduringconventional..........
【中国标准分类号】:P13
【国际标准分类号】:13_060_10
【页数】:9P.;A4
【正文语种】:英语