Designation:D5850−95(Reapproved2012)StandardTestMethodfor(AnalyticalProcedure)DeterminingTransmissivity,StorageCoefficient,andAnisotropyRatiofromaNetworkofPartiallyPenetratingWells1ThisstandardisissuedunderthefixeddesignationD5850;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversananalyticalprocedurefordeterminingthetransmissivity,storagecoefficient,andratioofverticaltohorizontalhydraulicconductivityofaconfinedaquiferusingobservationwelldrawdownmeasurementsfromaconstant-ratepumpingtest.Thistestmethodusesdatafromaminimumoffourpartiallypenetrating,properlypositionedobservationwellsaroundapartiallypenetratingcontrolwell.1.2TheanalyticalprocedureisusedinconjunctionwiththefieldprocedureinTestMethodD4050.1.3Limitations—Thelimitationsofthetechniquefordeter-minationofthehorizontalandverticalhydraulicconductivityofaquifersareprimarilyrelatedtothecorrespondencebetweenthefieldsituationandthesimplifyingassumptionofthistestmethod.1.4Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.TheSIunitsgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D653TerminologyRelatingtoSoil,Rock,andContainedFluidsD4050TestMethodfor(FieldProcedure)forWithdrawalandInjectionWellTestingforDeterminingHydraulicPropertiesofAquiferSystemsD5473TestMethodfor(AnalyticalProcedurefor)Analyz-ingtheEffectsofPartialPenetrationofControlWellandDeterminingtheHorizontalandVerticalHydraulicCon-ductivityinaNonleakyConfinedAquifer3.Terminology3.1Definitions:3.1.1aquifer,confined—anaquiferboundedaboveandbe-...
