MARYLANDDEPARTMENTOFTHEENVIRONMENT1800WashingtonBoulevard•BaltimoreMD21230410-537-3000•1-800-633-6101MartinO’MalleyGovernorShariT.WilsonSecretaryAnthonyG.BrownLieutenantGovernorICEVi)RobertM.Summers,Ph.D.DeputySecretary 

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2OiMr.ShawnM.GarvinRegionalAdministrator(3RA00)U.S.EnvironmentalProtectionAgencyRegionIll1650ArchStreetPhiladelphiaPA19103-2023DearMr.Garvin:Sincerly,ShariT.WilsonSecretaryMarylandDepartmentofEnvironmentAttachmentMA12010EPA,EtiftJNIll‘thrn!—H-i;I.RECP,1Er)MAR1820103AP30www.mde.state.md.us 

# MDEPursuanttosection181(a)(5)oftheCleanAirActthisisarequestfora1-yearattainmentdateextensiontoJune15,2011fortheCecilCountynonattainmentareawhichisclassifiedasmoderateforthe19978-hourozonenationalambientairqualitystandard(NAAQSorstandard).Bythisletter,Iamcertifyingthat:1)TheStateofMarylandhascompliedwithallrequirementsandcommitmentspertainingtotheareaintheapplicableozoneimplementationplan;and2)TheCecilCountynonattainmentarea’s4thhighestdaily8-hourmonitoredvalueduringthe2009ozoneseasonis0.084ppmorless.AttachedisthelettercertifyingthatourozoneairqualitydataintheAirQualitySystemiscomplete,quality-assuredambientairqualitymonitoringdataforthe2009attainmentyearozoneseason.Marylandwouldappreciateyourtakingactiononthisrequestassoonaspossible.Ifyouwouldliketodiscussthisfurtherpleasecallmeat410-537-3084.RECEIVEDMAR182010ujiecior(3APOO)RecycledPaperTTYUsers1-800-735-2258ViaMarylandRelayService\MARYLANDDEPARTMENTOFTHEENVIRONMENT1800WashingtonBoulevard•BaltimoreMD21230fvIDE410-537-3000•1-800-633-6101MartinO’MalleyShariT.WilsonGovernorSecretaryAnthonyG.BrownRobertM.Summers,Ph.D.LieutenantGovernorDeputySecretaryJanuary27,2010Mr.ShawnM.Garvin,RegionalAdministratorU.S.EnvironmentalProtectionAgencyRegionIll-MiddleAtlanticRegion(3RAOO)1650ArchStreetPhiladelphia,PA19103-2029DearMr.Garvin:TheMarylandDepartmentoftheEnvironment’s2009Ozoneambientconcentrationdata,alongwiththequalityassurancedataiscompletelysubmittedtotheNationalAirQualitydatabase,AQS.ThedatawasreviewedandcertifiedascorrecttothebestoftheirknowledgetakingintoconsiderationthequalityassurancefindingsbytheAmbientAirMonitoringProgram,AirandRadiationManagementAdministration.TheAMP45Oreportisincludedwiththisletter.The2009OzonesitesarelistedintheAMP45O(reportID:710026).TheAMP255(reportID:710307)isalsoincludedwiththisletter.Thisreportcontainstheprecisionandaccuracysummariesforthe2009Ozonedata.AstheseniorairpollutionofficialfortheStateofMaryland,IagreewiththeAmbientAirMonitoringProgram’sassessmentofthe2009Ozonedata.IrequestthatthedatabeincludedasearlycertifiedofficialdataforMarylandintheNationalAirQualitydatabase.MDEissubmittingthisdataforearlycertificationsothatitcanbereviewedbyEPAfortheBaltimoreMetroandCecilCounty8-hourOzone1-yearattainmentdateextensionprocess.OnceRegion3’sreviewofthecertificationpackageiscompletepleaseforwardittoMr.DavidLutz,DataCertificationContact,USEPA(D243-02),U.S.EnvironmentalProtectionAgency,ResearchTrianglePark,NC27711forinsertionintotheAQSdatabaseascertified2009MarylandOzonedata.SincereJy,Geofe(Tad)Aburn,DirectorAirandRadiationManagementAdministrationTAD/EGcc:WalterWilkie,EPA,RegionIIIEdwinGluthRecycledPaperwww.mde.state.md.usTTYUsers1-800-735-2258ViaMarylandRelayService