Designation:D4448−01(Reapproved2019)StandardGuideforSamplingGround-WaterMonitoringWells1ThisstandardisissuedunderthefixeddesignationD4448;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoverssamplingequipmentandproceduresand“inthefield”preservation,anditdoesnotincludewelllocation,depth,welldevelopment,designandconstruction,screening,oranalyticalproceduresthatalsohaveasignificantbearingonsamplingresults.Thisguideisintendedtoassistaknowledgeableprofessionalintheselectionofequipmentforobtainingrepresentativesamplesfromground-watermonitor-ingwellsthatarecompatiblewiththeformationsbeingsampled,thesitehydrogeology,andtheenduseofthedata.1.2Thisguideisonlyintendedtoprovideareviewofmanyofthemostcommonlyusedmethodsforcollectingground-waterqualitysamplesfrommonitoringwellsandisnotintendedtoserveasaground-watermonitoringplanforanyspecificapplication.Becauseofthelargeandeverincreasingnumberofoptionsavailable,nosingleguidecanbeviewedascomprehensive.Thepractitionermustmakeeveryefforttoensurethatthemethodsused,whetherornottheyaread-dressedinthisguide,areadequatetosatisfythemonitoringobjectivesateachsite.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareprovidedforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.Refere...
