Designation:E1903−11StandardPracticeforEnvironmentalSiteAssessments:PhaseIIEnvironmentalSiteAssessmentProcess1ThisstandardisissuedunderthefixeddesignationE1903;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispractice2coversaprocessforconductingaPhaseIIenvironmentalsiteassessment(ESA)ofaparcelofpropertywithrespecttothepresenceorthelikelypresenceofsub-stancesincludingbutnotlimitedtothosewithinthescopeoftheComprehensiveEnvironmentalResponse,CompensationandLiabilityAct(CERCLA)(e.g.,hazardoussubstances),pollutants,contaminants,petroleumandpetroleumproducts,andcontrolledsubstancesandconstituentsthereof.Itspecifiesproceduresbasedonthescientificmethodtocharacterizepropertyconditionsinanobjective,representative,reproduc-ible,anddefensiblemanner.TopromoteclarityindefiningPhaseIIESAobjectivesandtransparencyincommunicatingandinterpretingPhaseIIESAresults,thispracticespecifiesadherencetorequirementsfordocumentingthescopeofassessmentandconstraintsontheconductoftheassessmentprocess.1.1.1Auser’sinterestinthepresenceorlikelypresenceofsubstancesinenvironmentalmediaatapropertymayariseinawidevarietyoflegal,regulatory,andcommercialcontexts,andmayinvolvediverseobjectivesincludingthoselistedin1.2.ThispracticecontemplatesthattheuserandthePhaseIIAssessorwillconsulttodefinethescopeandobjectivesofinvestigationinlightofrelevantfactors,includingwithoutlimitationthesubstancesreleasedorpossiblyreleasedattheproperty,thenatureoftheconcernspresentedbytheirpresenceorlikelypresence,theportionofthepropertytobeinvesti-gated,theinformationalreadyavailable,thedegreeofconfi-denceneededordesiredintheresults,thedegreeofinvesti-gatorysamplingandchemicaltestingneededtoachievesuchconfidence,andanyapplicabletimeandresourceconstraints.ThispracticerequiresthatPhaseIIactivitiesbeconductedsot...
