Designation:D6538−12(Reapproved2019)StandardGuideforSamplingWastewaterWithAutomaticSamplers1ThisstandardisissuedunderthefixeddesignationD6538;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoverstheselectionanduseofautomaticwastewatersamplers,includingproceduresfortheiruseinobtainingrepresentativesamples.Automaticwastewatersam-plersareintendedfortheunattendedcollectionofsamplesthatarerepresentativeoftheparametersofinterestinthewaste-waterbody.Whilethisguideprimarilyaddressesthesamplingofwastewater,thesameautomaticsamplersmaybeusedtosampleprocessstreamsandnaturalwaterbodies.1.2Theguidedoesnotaddressgeneralguidelinesforplanningwastesamplingactivities(seeGuideD4687),devel-opmentofdataqualityobjectives(seePracticeD5792),thedesignofmonitoringsystemsanddeterminationofthenumberofsamplestocollect(seeGuideD6311),operationaldetailsofanyspecifictypeofsampler,in-situmeasurementofparam-etersofinterest,dataassessmentandstatisticalinterpretationofresultantdata(seeGuideD6233),orsamplingandfieldqualityassurance(seeGuideD5612).Italsodoesnotaddresssamplinggroundwater.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3.1Exception—Theinch-poundunitsgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTr...
