Designation:D5980−16StandardGuideforSelectionandDocumentationofExistingWellsforUseinEnvironmentalSiteCharacterizationandMonitoring1ThisstandardisissuedunderthefixeddesignationD5980;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisguidecoverstheuseofexistingwellsforenviron-mentalsitecharacterizationandmonitoring.Itcoversthefollowingmajortopics:criteriafordeterminingthesuitabilityofexistingwellsforhydrogeologiccharacterizationandgroundwaterqualitymonitoring,typesofdataneededtodocumentthesuitabilityofanexistingwell,andtherelativeadvantagesanddisadvantagesofexistinglarge-andsmall-capacitywells.1.2ThisguideshouldbeusedinconjunctionwithGuideD5730,thatprovidesageneralapproachforenvironmentalsiteinvestigations.1.3Thisguidedoesnotspecificallyaddressdesignandconstructionofnewmonitoringorsupplywells.RefertoPracticesD5092andD5787.1.4Thisguidedoesnotspecificallyaddressgroundwatersamplingprocedures.RefertoGuideD5903.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.7Thisguideoffersanorganizedcollectionofinformationoraseriesofoptionsanddoesnotrecommendaspecificcourseofaction.Thisguidecannotreplaceeducationorexperienceandshouldbeusedinconjunctionwithprofessionaljudgment.Notallaspectsofthisguidemaybeapplicableinallcircumstances.Thisguideisnotintendedtorepresentorreplacethestandardofcarebywhichtheadequacyofagivenprofessionalservicemustbejudged,norshouldthisguidebeappliedwithoutconsiderationofaproject’smanyuniqueaspects.Theword“Standard”inthetitleofthisdocumentmeanso...
