Designation:D5920−14StandardTestMethod(AnalyticalProcedure)forTestsofAnisotropicUnconfinedAquifersbyNeumanMethod1ThisstandardisissuedunderthefixeddesignationD5920;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversananalyticalprocedurefordeterminingthetransmissivity,storagecoefficient,specificyield,andhorizontal-to-verticalhydraulicconductivityratioofanunconfinedaquifer.Itisusedtoanalyzethedrawdownofwaterlevelsinpiezometersandpartiallyorfullypenetratingobservationwellsduringpumpingfromacontrolwellataconstantrate.1.2TheanalyticalproceduregiveninthistestmethodisusedinconjunctionwithGuideD4043andTestMethodD4050.1.3ThevaliduseoftheNeumanmethodislimitedtodeterminationoftransmissivitiesforaquifersinhydrogeologicsettingswithreasonablecorrespondencetotheassumptionsofthetheory.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D653TerminologyRelatingtoSoil,Rock,andContainedFluidsD3740PracticeforMinimumRequirementsforAgenciesEngagedinTestingand/orInspectionofSoilandRockasUsedinEngineeringDesignandConstructionD4043GuideforSelectionofAquiferTestMethodinDeterminingHydraulicPropertiesbyWellTechniquesD4050TestMethodfor(FieldProcedure)forWithdrawalandInjectionWellTestsforDeterminingHydraulicProp-ertiesofAquiferSystemsD4105TestMethodfor(AnalyticalProcedure)forDeter-miningTransmissivityandStorageCoefficientofNon-leakyConfinedAquifersbytheModifiedTheisNonequi-libriumMethodD4106TestMethodfor(AnalyticalProcedure)forDeter-miningTransmissivityandStorageCoefficientofNon-leaky...
