Designation:D4050−20StandardTestMethodfor(FieldProcedure)forWithdrawalandInjectionWellTestingforDeterminingHydraulicPropertiesofAquiferSystems1ThisstandardisissuedunderthefixeddesignationD4050;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthefieldprocedureforselectingwelllocations,controllingchange(dischargeorinjection)rates,andmeasuringwaterlevelsusedtoanalyzethehydraulicpropertiesofanaquiferoraquifersandadjacentconfiningbeds.1.2Thistestmethodisusedinconjunctionwithananalyti-calproceduresuchasTestMethodsD4105/D4105MorD4106toevaluatethedataanddetermineaquiferproperties.1.3TheappropriatefieldandanalyticalproceduresareselectedasdescribedinGuideD4043.1.4Limitations—ThelimitationsofthistestmethodareprimarilyrelatedtothecorrespondencebetweenthefieldsituationdeterminedbythistestmethodandthesimplifyingassumptionsoftheanalyticalTestMethodsD4105/D4105MorD4106andD4043.1.5Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.ReportingoftestresultsinunitsotherthanSIshallnotberegardedasnonconformancewiththisstandard.1.6AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.6.1Theproceduresusedtospecifyhowdataarecollected/recordedorcalculated,inthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatgenerallyshouldberetained.Theproce-duresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsider-ationsfortheuser’sobjectives;anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatobecommensuratewiththeseconsiderations.Itisbeyondthescopeofthisstandardtoconsidersignificantdigitsusedinanalyticalmethodsforengineeringdesign.1.7Thistestmethodoffersasetofinstructionsforperform-ing...
