{lnArchive}ElwriteupforDCAreaPMSIPJanetKremerto:MarilynPowers10/30/200905:29PMHistory:Thismessagehasbeenforwarded.Archive:Thismessageisbeingviewedinanarchive.1attachmentWashington_DQPM25_TSD.docHiMarilyn,SorryIhadn’tsentthisearlier-timejustslippedby.HereisthewriteupfortheDCArea2002baseyearinventory.Letmeknowifyouhaveanyquestions.Talktoyousoon.Janet****************************JanetC.KremerEnvironmentalEngineerU.S.EPA-Region3215-814-21472002SIPBaseYearInventoryTheSIPbaseyearinventoryistheprimaryinventoryfromwhichotherinventories(3-yearcycleinventories,reasonablefurtherprogressinventories,modelinginventories)arederived.TheCleanAirActcallsforState,local,andTribalagenciestoensurethatthebaseyearinventoryiscomprehensive,accurate,andcurrentforallactualemissions.1Thebaseyearinventoryincludesemissionsestimatesfromstationarypointandnonpointsources,onroadmobilesources,andnonroadmobilesources.ForthePM2.5NAAQS,thepollutantstobeinventoriedareprimaryemissions(includingcondensable)ofPMlOandPM2.5,andemissionsofS02,NH3,VOC,andNOx.ForthePM2.5NAAQSemissionsshouldbereportedasactualannualweekdayemissions.TheStateAirAgenciesdefinedtheirbaseyearinventorywasfor2002.FortheWashingtonDC-MD-VA(theWashingtonArea)SIP,thegeographiccoverageincludessourcesintheDistrictofColumbia(VA);Arlington,Fairfax,Loudoun,andPrinceWilliamCountiesandthecitiesofAlexandria,FallsChurch,Fairfax,Manassas,andManassasParkinVirginia(VA);aswellasCharles,Frederick,Montgomery,andPrinceGeorgecountiesandthecitiesofBowie,CollegePark,Gaithersburg,Greenbelt,Frederick,Rockville,andTakomaParkinMaryland(MD).AsignificantamountofdocumentationisrequiredfortheseSIPbaseyearestimateswhichhavebeenprovidedbytheStateAirAgencies.TheStateAirAgencies,alongwiththeMetropolitanWashingtonCouncilofGovernments(MWCOG),workedtogethertodevelopa2002baseyearinventoryfortheWashingtonArea.TheStateAirAgencies,incollaborationwithMWCOG,developedthepointsourcedatafor2002baseyearinventory.TheStateAirAgenciesprovidedits2002actualannualemissionsforNOx,COandVOCatthefacilitylevelandattheprocess-level.ItshouldbenotedthattheStateofMarylandalsoincludedAndrewsAirForceBaseasapointsource-calledaquasi-pointsource(acompilationofemissionsfromseveraldifferentsourcetypes,totaledunderasinglepointsource).Forthe2002NonpointSourceemissions,alsoknownas“areasources,”theStateAirAgenciesprovidedaninventorythatcontainedestimationsofemissionsbymultiplyinganemissionfactorbysomeknownindicatorofcollectiveactivityforeachsourcecategoryatthecounty(orcounty-equivalent).Theseemissionsarecalculatedonanannualbasis.VOCandNOxemissionsforVirginiaandtheDistrictofColumbiawerepreparedbytheirrespectivestateairagencies,PM2.5,PM1O,SO2,andNH3emissionswerepreparedbytheVisibilityImprovementStateandTribalAssociationoftheSoutheast(VISTAS)andtheMid-Atlantic/NortheastVisibilityUnion(MANE-VU).Varioussourcesofemissionfactorsormethodologieswereused,includingEPA’sAP42,EPA’sEmissionsInventoryImprovementProgram,andEPAmobilesourcemodel.NonpointsourceestimateswereprovidedbySCC.TheNonroadMobileSource2002inventorywaspreparedbyMCOGwithEPA’sNONROAD2005amodel,versionasof02/08/2006,andEPAemissionfactors.“EmissionsInventoryGuidanceforImplementationofOzoneandParticulateMatterNationalAmbientAirQualityStandards(NAAQS)andRegionalHazeRegulations”EPA-454/R-05-OO1,August2005-.;,.,.......NONROADestimatesfuelconsumptionandemissionsoftotalhydrocarbons,carbonmonoxide,nitrogenoxides,sulfurdioxide,andparticulatematterforallnonroadmobilesourcecategoriesexceptforaircraft,locomotives,andcommercialmarinevessels.TheNOMOAD2005modelwasruntheWashingtonAreaforannualemissions.Modelinputswerepreparedthefourseasonsforeachjurisdiction.Emissionestimatesforlocomotiveenginesandaircraftemissionswereprovidedseparately.Forlocomotiveengineandlinehaulemissions,DCandMDrequestedandreceivedfuelusageandactivitydata,fromtheoperationswithintheirrespectivecounties,todetermineemissions.VAusedemissionfactorsfroma1997EPATechnicalMemorandum.TheWashingtonAreacontainsseveralairportsthathaveseveraldifferenttypesofaircraftwithdifferentactivityassociatedwiththem.Therearetwocommercialairports(bothlocatedinVA),12public-usegeneralaviationairports(locatedinMDandVA),andthreeairportsthatservemilitaryairporttraffic(locatedinMDandVA).TheStateAirAgenciesusedseveralsourcesofinformationtoobtainemissionratesandactivitydata:FederalAviationAdministration’s(FAA)AirTraffic1990.andtheAirportActivityStatisticsofCertifiedRouteAirCarriers;landingandtakeoffcycleinformationfromtheAviationAdministrationandtheFederalAviationAdministrationAirportLicenseRenewalApplications;andFAA’sEmissions&DispersionModelingSystem(EDMS).AllNonroadmobilesourceemissionswereprovidedbySCC.TheOnroadMobileSource2002emissionsinventorywasdevelopedusingthemostcurrentversionofEPA’shighwaymobilesourceemissionsmodelMOBILE6.2andtrafficactivitydatafromtheNationalCapitolRegionTransportationPlanningBoard.MCOGprovidedMobile6.2inputandoutputfilesforreview.Mobileemissionsvaluesweregiveninunitsoftons/yearwereprovidedbySCC.TheStateAgenciesalsoappliedruleeffectivenessandrulepenetrationforits2002PM2.5SIPbaseyearinventories.Ruleeffectivenessreflectstheactualabilityofaregulatoryprogramtoachievetheemissionreductionsrequiredbyregulation(orperhapsvoluntarilyadopted).TheStateAgenciesappliedruleeffectivenessandwhereapplicable,providedajustificationofahigherpercentagethanEPA’spreviouspolicy(whichassumed80%ruleeffectivenessforapplicablesourcesunlessotherwisespecified).Rulepenetrationisanestimateofpercentageofemissionsinasourcecategorythatareemittedatfacilitiessubjecttotherequirementsofarule.TheStateAgenciesappliedrulepenetrationforitsnonpointsourceswhereapplicable.AQABstaffreviewedtheresults,procedures,andmethodologiesfortheSIPbaseyear,andfoundthemtobeapprovable.