CCTechnicalSupportDocument(TSD)ForWashingtonCountyMaryland:PM2.5BaseYearInventory.SubmittedJune06,2008bytheMarylandDepartmentoftheEnvironmentTSDPreparedMay2010JanetC.KremerOfficeofAirMonitoringandAnalysis,3AP40U.S.EnvironmentalProtectionAgency,Region31650ArchStreetPhiladelphia,Pennsylvania19103“ReviewedbyWalterWilkie,AssociateDirectorOfficeofAirMonitoringandAnalysis(3AP40)H,3’ODateSignedCI.IntroductionThepurposeofthisdocumentistoprovideatechnicalsummaryoftheOfficeofAirMonitoringandAnalysis’(OAMA)reviewoftheemissionsinventoriessubmittedwiththeWashingtonCountyMarylandPM2.5StateImplementationPlan(SIP)bytheMarylandDepartmentoftheEnvironment(MDE).ThisreviewdeterminestheapprovabilityoftheSIPBaseYearInventoryandanevaluationofthemethodsusedforprojectionyearinventories.ASIPBaseYearInventoryisthestartingpointfromwhichotherSIPinventoriesarederivedaswellasservingasthebenchmarkforotherSIPplanningactivities,suchastheestablishmentofanemissionsreductioncreditprogram.Projectionyearinventoriesareessentiallyusedtotrackprogress;thepurposeofwhichistodemonstrateareductioninemissionsofregulatedsourcesfromtheBaseYeartoaprojectedyear.WashingtonCountyistheMarylandportionoftheMartinsburg,WVHagerstownMDPM2.5nonattainmentarea.MarylandDepartmentoftheEnvironmenthassubmittedtheWashingtonCountyMarylandPM2.5NonattainmentSIPwitha2002BaseYearInventoryandhasrequestedEPA’sapproval.AnyquestionspertainingtothistechnicalsummaryshouldbedirectedtoWalterK.Wilkie,AssociateDirector,OfficeofAirMonitoringandAnalysisat215-814-2150orviaemailatwilkie.walter(epa.gov.II2002SIPBaseYearInventoryTheSIPbaseyearinventoryistheprimaryinventoryfromwhichotherinventories(3-yearcycleinventories,reasonablefurtherprogressinventories,modelinginventories)arederived.TheCleanAirActcallsforState,local,andTribalagenciestoensurethatthebaseyearinventoryiscomprehensive,accurate,andcurrentforallactualemissions.1Thebaseyearinventoryincludesemissionsestimatesfromstationarypointandnonpointsources,onroadmobilesources,andnonroadmobilesources.ForthePM2.5NAAQS,thepollutantstobeinventoriedareVOC,NOx,NH3,S02,PM1OandPM2.5.ForthePM2.5NAAQSemissionsshouldbereportedasactualannualemissions.MDE’sbaseyearinventoryisfor2002.AsignificantamountofdocumentationisrequiredfortheseSIPbaseyearestimateswhichMDEhasprovided.IntheMDESIP,thebaseyearusedwas2002.MDE’sAirandRadiationManagementAdministration(ARMA)isprimarilyresponsibleforcompilingthePointSourcedatafor2002.ARMAusesseveralformsofsourceidentification.Thestate’sprimarydatasourceisfromitspermittingprogram,whichincludespermitapplicationsandequipmentregistrations.AREVIAalsoreliesonitscomplianceprogram,whichinvolvesusinginformationgatheredfrominspectionsandcitizencomplaints.ARIvIAprovidedits2002actualemissionsforVOC,NOx,NH3,S02,PM1OandPM2.5atthefacilitylevelandattheprocess-level.Forthe2002NonpointSourceemissions,alsoknownas“areasources,”ARMAprovidedaninventorythatcontainedestimationsofemissionsbymultiplyinganemission“EmissionsInventoryGuidanceforImplementationofOzoneandParticulateMatterNationalAmbientAirQualityStandards(NAAQS)andRegionalHazeRegulations”EPA-454/R-05-0O1,August20050,C,factorbysomeknownindicatororactivitylevelforeachcategoryatthecountylevel.Theseemissionsarecalculatedonanannualbasisbecausetheactivitydataaregenerallyonlyavailableonanannualbasis.Varioussourcesofemissionfactorsormethodologieswereused,includingEPA’sAP-42,EPA’sEmissionsInventoryImprovementProgram,andEPAmobilesourcemodel.NonpointsourceestimateswereprovidedbySCC.TheNonroadMobileSource2002inventorywaspreparedwithEPA’sNONROAD2005model,versionasof03/21/2006,andEPAemissionfactors.NONROADestimatesfuelconsumptionandemissionsoftotalhydrocarbons,carbonmonoxide,nitrogenoxides,sulfurdioxide,andparticulatematterforallnonroadmobilesourcecategoriesexceptforaircraft,locomotives,andcommercialmarinevessels.ARIVIAprovidedemissionestimatesforlocomotiveengines,aircraftemissionsseparately.Forlocomotiveengineandlinehaulemissions,ARMArequestedandreceivedfuelusageandtrackmileagedatafromall13railroadsoperatinginMaryland.Fuelusagewasproportionedtoeachcountybytheamountoftrackmileseachcompanyutilizedinacounty.PairedwithEPAemissionandconversionfactors,ARMAcalculatedlocomotiveemissionsforthebaseyear.Foraircraftemissions,ARMAusedseveralsourcesofinformation:FederalAviationAdministration’s(FAA)AirportActivityStatisticsofCertificatedRouteAirCarriers;landingandtakeoffcycleinformationbyairportinMaryland;AviationAdministrationandtheFederalAviationAdministration::‘AirportLicenseRenewalApplications;andFAA’sEmissions&DispersionModelingSystem(EDMS).AllNonroadmobilesourceemissionswereprovidedbySCC.TheOnroadMobileSource2002emissionsinventorywasdevelopedusingthemostcurrentversionofEPA’shighwaymobilesourceemissionsmodelMOBILE6.2andtrafficactivitydatafromtheMarylandStateHighwayAdministration.ARIVIAalsousedPPSUITE,anenhancedversionofthePostProcessorforAirQualitysoftwaresystems.ARIvIAprovidedMobile6.2inputandoutputfilesforreview.MobileemissionsvaluesweregiveninunitsoftonsperyearandwereprovidedbySCC.ARMAalsoappliedruleeffectivenessandrulepenetrationforits2002PM2.5SIPbaseyearinventories.Ruleeffectivenessreflectstheactualabilityofaregulatoryprogramtoachievetheemissionreductionsrequiredbyregulation(orperhapsvoluntarilyadopted).ARMAappliedruleeffectivenessandwhereapplicable,providedajustificationofahigherpercentagethanEPA’spreviouspolicy(whichassumedan80%ruleeffectivenessforapplicablesourcesunlessotherwisespecified).Rulepenetrationisanestimateofpercentageofemissionsinasourcecategorythatareemittedatfacilitiessubjecttotherequirementsofarule.ARMAappliedrulepenetrationforitsnonpointsourceswhereapplicable.OAMAstaffreviewedtheresults,procedures,andmethodologiesfortheSIPbaseyear,andfoundthemtobeapprovable.