Designation:E1739−95(Reapproved2015)StandardGuideforRisk-BasedCorrectiveActionAppliedatPetroleumReleaseSites1ThisstandardisissuedunderthefixeddesignationE1739;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisisaguidetorisk-basedcorrectiveaction(RBCA),whichisaconsistentdecision-makingprocessfortheassess-mentandresponsetoapetroleumrelease,basedontheprotectionofhumanhealthandtheenvironment.Siteswithpetroleumreleasevarygreatlyintermsofcomplexity,physicalandchemicalcharacteristics,andintheriskthattheymayposetohumanhealthandtheenvironment.TheRBCAprocessrecognizesthisdiversity,andusesatieredapproachwherecorrectiveactionactivitiesaretailoredtosite-specificcondi-tionsandrisks.WhiletheRBCAprocessisnotlimitedtoaparticularclassofcompounds,thisguideemphasizestheapplicationofRBCAtopetroleumproductreleasesthroughtheuseoftheexamples.Ecologicalriskassessment,asdiscussedinthisguide,isaqualitativeevaluationoftheactualorpotentialimpactstoenvironmental(nonhuman)receptors.Theremaybecircumstancesunderwhichamoredetailedecologicalriskassessmentisnecessary(seeRef(1).21.2Thedecisionprocessdescribedinthisguideintegratesriskandexposureassessmentpractices,assuggestedbytheUnitedStatesEnvironmentalProtectionAgency(USEPA),withsiteassessmentactivitiesandremedialmeasureselectiontoensurethatthechosenactionisprotectiveofhumanhealthandtheenvironment.ThefollowinggeneralsequenceofeventsisprescribedinRBCA,oncetheprocessistriggeredbythesuspicionorconfirmationofpetroleumrelease:1.2.1Performanceofasiteassessment;1.2.2Classificationofthesitebytheurgencyofinitialresponse;1.2.3Implementationofaninitialresponseactionappropri-atefortheselectedsiteclassification;1.2.4Comparisonofconcentrationsofchemical(s)ofcon-cernatthesitewithTier1RiskBasedScreeningLevels(RBSLs)giveninalook-uptable;1.2.5Deci...
