DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI1CBlVEDJUL222q11M1NISTRAIORMISSINGOZONEDATAANALYSIS2010ANDSUPPLEMENTAL2009FORBRANDYWINE(AQSSITEID10-003-1010)DELAWAREDEPARTMENTOFNATURALRESOURCESANDENVIRONMENTALCONTROLDIVISIONOFAIRQUALITYJuly5,2011DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI2TableofContentsBackgroundandSummary3Resultsfor2010missingdataanalysis4Resultsfor2009missingdataanalysis4Conclusion52010DataAnalysis6Methodology6Historicaldata6StatisticalProcedures7Results8ImpactonDesignValues10Conclusion112009SupplementalDataAnalysis13Methodology132009data13Results13Conclusion15APPENDIXA—Procedures162010ozonedataanalysis162009ozonedataanalysis16APPENDIXB—OzoneDataTablesandFigures182010Daily8-hourozonemaxima182009Daily8-hourozonemaximaforselecteddates252009Solarradiationgraphs27200924-hourPrecipitationmapsfromNCDCASOS2920098-hourozonemaximaAirNOWmaps31APPENDIXC-Data35DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI3BackgroundandSummaryInlateJulyandAugust2010,fallentreescausedcompletepowerlossandsignificantdown-timeattheBrandywineairmonitoringstation(AQSID10-003-1010).AnextendedpoweroutageresultedinnovaliddatabeingcollectedfromJuly21throughAugust20,2010.OthermiscellaneousissuesresultedinsmallerdatalossonindividualdaysinMayandJune2010.Theresultingtotalvaliddatacapturefor2010atBrandywinewas85%.Previousyear’sdatacapturewas95%for2008and79%for2009,forathreeyearaverage2008-2010of86%.Section2.3(b)ofAppendixIto40CFRPart50requiresthreeconsecutiveyearsofdatawithdataavailabilityofatleast90%onaverage,withaminimumdatacompletenessinanyoneyearofatleast75%.Furthermore,thissectionalsostates:“...Whencomputingwhethertheminimumdatacompletenessrequirementshavebeenmet,meteorologicalorambientdatamaybesufficienttodemonstratethatmeteorologicalconditionsonmissingdayswerenotconducivetoconcentrationsabovethelevelofthestandard.Missingdaysassumedlessthanthelevelofthestandardarecountedforthepurposeofmeetingthedatacompletenessrequirement,subjecttotheapprovaloftheappropriateRegionalAdministrator.”Becausethemissingdataoccurredlargelyduringmid-summerwithassociatedhighdailyaveragetemperatures,meteorologicaldataalonewerenotsufficienttoestimatemissingdatabelowtheNAAQS.DelawarethereforeperformedacorrelationanalysisbetweentheBrandywinesiteandotherlocalregionalozonemonitorstodemonstratethatasuitablelinearregressionequationwithahighcoefficientofdeterminationcouldbeusedtogenerateestimateddaily8-hourozonemaximaforthemissingdaysin2010.InJuly2010,Delawarehadperformedamissingdataanalysisfor2009datafromtheBrandywinesite(DataSubstitutionAnalysis,2009Ozone,BrandywineAQSSiteID10-003-1010,DEDNREC,DivisionofAirQuality,July15,2010).Furtherreviewofthe2009ozonemonitoringdatafortheBrandywinesiteandnearbyregionalsitesindicatedthattherewereasignificantnumberofadditionalmissingdayslikelytobebelowtheNAAQS.Tosupplementtheearlieranalysis,Delawareexpandedthemeteorologicalassessmentforadditionalmissingdaysin2009.Intheoriginalmissing2009ozonedataanalysis,DelawareDAQusedadailymaximumtemperatureassessmenttodeterminewhatmissingdaysshouldbecountedasvaliddaysinregardstodatacompleteness.Inthecurrentassessment,therewereanumberofadditionaldaysidentifiedashavinglowozoneconcentrationsmeasuredbyothernearbymonitoringsiteseventhoughthedailymaximumtemperaturewasslightlyhigherthantheoriginalcut-offlevelof75°F.Additionalfactorsconsideredinthecurrentassessmentincludeprecipitation,cloudcover,andwindspeeddataaswellasregionalozonedailymaximamapsfromtheAirNOWwebsite.DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI4Resultsfor2010missingdataanalysis:•Thecorrelationanalysisshowedahighcoefficientofdetermination(R2of0.9211)betweentheBrandywinedaily8-hourmaximaandthelocalregionaldailymaxima.TheresultingregressionequationwasdeemedsuitableforgeneratingestimateddailymaximaozonevaluesforthemissingdaysatBrandywine.•Usingtheregressionequation,therewere26dayswithestimatedmaximabelowthe1997NAAQS.Thehighestestimateddailymaximumwas0.078ppm,whichis0.007ppmlowerthantheNAAQSexceedancelevelof0.085ppm.Thiswasdeemedtobeanadequatemarginoferrortoreasonablyassumethe26missingdaystobebelowtheNAAQS.•NodifferencewasfoundinthedesignvaluesforBrandywinecalculatedwithorwithouttheestimateddailymaxima.Theconclusionisthatuseofthecorrelationmethodwouldhavenoeffectonthedesignvalue.•Withthe26additionaldaysassumedtobelessthanthestandard,datacompletenessforBrandywinein2010is97%.TheDelawareDNRECDivisionofAirQuality(DAQ)thereforedeterminedthattheuseofthenulldatacode,“BG”,forthefollowing26daysisappropriate:DatesDayCount5/2115/2715/30-3126/1417/25—7/2737/29—8/9128/12—8/1658/181TOTAL26Addingthe26daystotheBrandywinedataresultsinadatacapturepercentageof97%for2010.Resultsfor2009missingdataanalysis:Dateswithlowregionalozone8-hourmaxima(lessthan50ppb)andmeteorologyconsistentwithlowozoneconcentrationswereidentified.SpecificmeteorologyfortheWilmingtonareawasexaminedandsupportingevidenceforlowozoneconcentrationsattheBrandywinesitewasDEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI5identified,includingdayswithcloudcover,precipitationevents,highaveragewinds,andlowconcentrationsofozonefromlocalregionalmonitors.Analysisofmeteorologicalconditions,precipitationrecords,andregionalozonemapsshowedthat16dayswerelikelytorepresentlowozoneconcentrationsformissingdaysattheBrandywinemonitoringsite.Inreviewingalltheprimaryandsupplementalinformation,16daysarebeingproposedbyDelawareasappropriatefortheuseofthenulldatacode“BG”aslistedbelow.Datesproposedforuseof”BG”5/14/20096/23/20096/30/20097/3/20097/4/20097/23/20098/6/20098/7/20098/13/20098/28/20098/29/20098/31/20099/1/200910/7/200910/9/200910/21/2009Withthese16additionaldaysassumedtobelessthanthestandard,combinedwiththepreviouslyaccepted55days,datacompletenessforBrandywinein2009is86%.ConclusionCombiningthe16additionaldaysassumedtobelessthanthestandardin2009withthe26additionaldaysassumedtobelessthanthestandardfor2010,thefinalthreeyearaveragedatacapturefor2008—2010forBrandywinewouldbe93%.Thismeetstheminimumrequirementof90%asstatedin40CFRPart50AppendixISection2.3(b).DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePage62010DataAnalysisMethodologyDelawareDAQusedalargelystatisticalapproachtodeterminewhichmissingdaysshouldbecountedasvaliddaysbelowtheNAAQSinregardstodatacompleteness.Thelargestamountofmissingdataoccurredduringsummerdayswithrelativelyhightemperatures(lateJuly—lateAugust),soastrictlymeteorologicalanalysiswouldnotbesufficienttoevaluatemissingdataassumedtobebelowthestandard.However,becauseozonelevelsaregenerallyconsistentacrossalocalgeographicarea,ozonevaluesfromothernearbymonitorscouldbeconsideredrepresentativeofBrandywineconcentrationsifastrongcorrelationstatisticalrelationshipwasestablished.ThelocalregionalozonedailymaximumdatawerethereforeevaluatedforcorrelationstatisticsandconsistencywiththeBrandywinesite(BCSP)todeterminewhichdayscouldbeassumedtobebelowthe1997NAAQS8-hourexceedancelevelof0.085ppm.(Note:Althoughtheactual1997NAAQSis0.08ppm,monitoredvaluesof0.085ppmandaboveareconsideredtobeexceedancesoftheNAAQS,thereforeforthepurposesofthisevaluationalevelof0.085ppmisused.)Historicaldata:Ozonedatafrom2006—2010werecompiledfortheBrandywinesitealongwithdatafrommonitorswithinarangeofapproximately20milesasshownassolidtrianglesinFigure1andlistedinTableAlofAppendixA.Daily8-hourozonemaximaforeachsitewerecalculatedinaccordancewith40CFRPart50AppendixISection2.1,andthehighestregional8-hourvalueforeachdaywasdetermined.ThedailymaximumdataareincludedinAppendixC.Figure1BrdgtonCotosva32’_________________/FairhillDoLawaruNNuwJ43ry1byC’vnI—8.y-L.‘DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePage7Theyears2006—2010werechosentorepresentrecentambientmonitoringdataandtocapturetypicalyear-to-yearfluctuationsinmeteorologyandgenerallyconsistentemissionsthatwouldreasonablyreflectconditionsin2010.Olderdatacouldhaveincludedhigheremissionsandresultantambientconcentrationsthatwouldnotbeasrepresentativeofrecentconditions.Themissing2010Brandywinedata,alongwithregionaldaily8-hourozonemaxima,areshowninFigure2.ThisgraphdemonstratesthatmostofthemissingdataoccurredinlateJulythroughlateAugust,withafewdaysalsomissinginlateMayandearlyJune.ThedataarealsoincludedinTableBlofAppendixB.Figure20.0400.0200.0002010daily8-hour03maxMax03MissingBCSPBCSPStatisticalProcedures:Linearcorrelationanalysiswasperformedonthedaily8-hourozonemaximafromtheselectedlocalregionalmonitoringsites.Themethodissimilartoanalysesfrequentlyutilizedbyotherstateandlocalairagenciesincomparingambientmeasurementsfordifferentmonitoringmethods,suchascomparisonsofparticulatemattermethodsaswellasMarylandDepartmentoftheEnvironment’srecentozonesubstitutionanalysis(ImpactofMissingDataatRockvilleOzoneMonitorontheWashington,DC-MD-VANon-AttainmentArea,AmbientAirMonitoringProgram,AirandRadiationAdministrationManagement,MarylandDepartmentoftheEnvironment,January11,2011).0.1200.1000.0800.0604/1/20105/1/20106/1/20107/1/20108/1/20109/1/201010/1/2010DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI8Thedaily8-hourregionalozonevalueswerereviewedandadailymaximumwasdeterminedforeachdateasshowninTable2ofAppendixB.Regressionanalysiswasthenperformedontheregionaldaily8-hourmaximaandtheBrandywinedailymaximaasshowninFigure3.Figure3Theregressionanalysisshowsacoefficientofdetermination(R2)of0.9211,whichdemonstratesaverystrongrelationshipfordailyozonemaximabetweentheBrandywinesiteandothermonitorswithina20mileradius.Thereisalsoapositiveintercept(residual)intheregressionequation,whichassuresthattheestimatedreplacementvaluesgeneratedbyusingtheregressionequationwillbehigherthantheactualregionaldailymaximabyatleast0.003ppm.Thestrengthofthecorrelationequationandthepositiveresidualvalueweredeterminedtorepresentasufficientlyrobustandconservativeestimationmethodwithasufficientlevelofconfidence,andtheregressionwasthereforedeemedsuitableforgeneratingestimateddailymaximaozonevaluesforthemissingdaysatBrandywine.ResultsApplyingtheregressionequationtotheregionaldailymaximaresultedinestimatedreplacementvaluesforallmissingBrandywinedataasshowninFigure4.ReplacementdataareshowninshadedboxesinTableB2ofAppendixB.0.140DailyMax8-hr03inppm2006-20100.1200.100E0.0.C0.080EE0.060C0GJV0.0400.020I0.00000.020.040.060.080.10.12Brandywinedailymaxinppm0.14DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI9Figure40.0400.0200.0004/1/20102010daily8-hour03max-allmissingdayssubstitutedMax03BCSPSubstituteddataUsingtheregressionequationtoreplaceallmissingdaysatBrandywineresultedin33estimateddaily8-hourozonemaxima.Sevenofthesedailymaxima,however,hadestimatedconcentrationsabove0.080ppmwhichwouldbeclosetoorabovetheactualNAAQSexceedancelevelof0.085ppm.Toestimatethedaily8-hourozonemaximabelowtheNAAQS,therefore,alldayswithcalculatedvaluesabove0.080ppmwereeliminated,leavingatotalof26estimateddailymaxima.TheeliminateddatapointsareshowninredinTableB2ofAppendixB.Theremaininghighestestimateddailymaximumwas0.078ppm,whichis0.007ppmbelowthe1997NAAQSexceedancelevelof0.085ppm.AllestimateddailymaximaforBrandywinewerehigherthantheactualmeasuredlocalregionalmaximabyatleast0.004ppm,andthiswasdeemedtobeanadequatemarginoferrortoassurethattheestimatedvalueswerereasonablyrepresentativeofdailymaximabelowtheNAAQS.Agraphicalrepresentationoftheresultswiththeestimatedvaluesforthe26replacementdaysisshowninFigure5.0.1200.1000.0800.0605/1/20106/1/20107/1/20108/1/20109/1/201010/1/2010DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePage10Figure50.1200.1000.0800.0600.0400.0202010daily8-hour03max-substituteddatabelowNAAQSMax03BCSPSubstituteddata0.0004/1/20105/1/20106/1/20107/1/20108/1/20109/1/201010/1/2010ThedailymaximavaluesinFigure5arealsoshowninTableB2ofAppendixB.ImpactonDesignValuesInordertoevaluatethepotentialimpactoftheestimatedvaluesshowninFigure5onthe8-hourozonedesignvaluefortheBrandywinesite,thedesignvalueswerecalculatedwithandwithoutthesubstitutedestimateddailymaxima.TheresultsareshowninTable1.DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI11Table1Year1stmax2ndmax3rdmax4thmax20060.0930.0900.0810.08120070.1170.0880.0870.08620080.1070.0890.0880.08220090.0770.0750.0700.06820100.0860.0840.0800.079Subst.20100.0860.0840.0800.0793-yearDesignValues2006-20080.0832007-20090.0792008-20100.0762008—subst.20100.076Itcanbeseenthatthe2008—2010designvalueof0.076ppmfortheBrandywinesite(threeyearaverageof4thdailymax)isnotimpactedbytheestimatedsubstituteddailymaxvaluesbelowtheNAAQS.Tofurtherexaminepotentialimpacts,thedailymaximaforthetenhighestvaluesfor2010,bothactualmeasurementsandsubstitutedestimations,werecomparedasshowninTable2.Table21St2nd3rd4th5th6th7th8th9th10th2010DatamaxmaxmaxmaxmaxmaxmaxmaxmaxmaxMeasured0.0860.0840.0800.0790.0790.0790.0780.0780.0770.075MeasuredplusSubstituted0.0860.0840.0800.0790.0790.0790.0780.0780.0780.077Itcanbeseenthatthereisnoimpactdowntotheeighthhighestdailymaxima(0.078ppm).Itisthereforereasonabletoconcludethatusingthelinearregressiontoestimatemissingdailymaximum8-hourBrandywineozonedatabelowthe1997NAAQSdoesnotaffectthedesignvalueforthatsiteandthereforedoesnotimpactthedesignvalueforthelocalregionalmonitoringarea.ConclusionThecorrelationanalysisshowedahighcoefficientofdetermination(R2of0.9211)betweentheBrandywinedaily8-hourmaximaandthelocalregionaldailymaxima,andasmallpositiveintercept/residualof0.003ppm.TheresultingregressionequationwasdeemedsuitableforgeneratingestimateddailymaximaozonevaluesforthemissingdaysatBrandywine.DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI12Usingtheregressionequation,daily8-houirozonemaximaweregeneratedfor26daysthatwereassumedtobebelowthe1997NAAQS.Thehighestestimateddailymaximumwas0.078ppm,whichis0.007ppmlowerthantheNAAQSexceedancelevelof0.085ppm.Thiswasdeemedtobeanadequatemarginoferrortoreasonablyassumethe26missingdaystobebelowtheNAAQS.UseoftheestimateddailymaximawasevaluatedincalculatingthedesignvaluesfortheBrandywinesite.NodifferencewasfoundinthedesignvaluesforBrandywinecalculatedwithorwithouttheestimateddailymaxima.TheconclusionisthatuseofthecorrelationmethodwouldhavenoimpactontheBrandywinedesignvalue.Withthe26additionaldaysassumedtobelessthanthestandard,datacompletenessforBrandywinein2010is97%.TheDelawareDNRECDivisionofAirQuality(DAQ)thereforedeterminedthattheuseofthenulldatacode,“BG”,forthefollowing26daysasshowninTable3isappropriate:Table3DatesDayCount5/2115/2715/30-3126/1417/25—7/2737/29—8/9128/12—8/1658/181TOTAL26Addingthe26daystotheBrandywinedataresultsinadatacapturepercentageof97%for2010,whichresultsinathreeyearaveragedatacaptureof90%andmeetstherequirementsof40CFRPart50AppendixISection2.3(b).DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI132009SupplementalDataAnalysisFurtherreviewofthe2009ozonemonitoringdatafortheBrandywinesiteandnearbyregionalsitesindicatedthattherewereasignificantnumberofadditionalmissingdayslikelytobebelowtheNAAQS.Tosupplementtheearlieranalysis,Delawareexpandedthemeteorologicalassessmentforadditionalmissingdaysin2009.MethodologyIntheoriginal2009missingozonedataanalysis,DelawareDAQusedadailymaximumtemperatureassessmenttodeterminewhatmissingdaysshouldbecountedasvaliddaysinregardstodatacompleteness.MeteorologicaldatafromtheWilmingtonareawasusedincombinationwithozonedata(bothhistoricaldatafromtheBrandywinesiteand2009datafromothernearbyozonesites)toevaluatethemissingdaysofdatatodeterminewhichdayscouldbeassumedtobebelowtheNAAQS8-hourstandardof0.075ppm.Thisresultedin55missingdaysin2009acceptedbyEPAasbeingbelowtheNAAQSwiththeuseofthenulldatacodeInthecurrentassessment,therewereanumberofdaysidentifiedashavinglowozoneconcentrationsmeasuredbyothernearbymonitoringsiteseventhoughthedailymaximumtemperaturewasslightlyhigherthantheoriginalcut-offlevelof75°F.Otherfactorsconsideredinthecurrentassessmentincludeprecipitation,cloudcover,andwindspeeddataaswellasregionalozonedailymaximamapsfromtheAirNOWwebsite.2009data:OzonedatafrommonitorsinNewCastleCountyandneighboringcountiesinPennsylvania,Maryland,andNewJerseyprovidedevidencethatlevelsonthemissingdayswerewellbelowthe8-hrozoneNAAQSatBrandywine.Thesamemonitorsforthe2010analysiswereusedasshowninTable1inAppendixA.DailymeteorologicaldatawasretrievedfromtheNationalWeatherServicesiteatNewCastleCountyAirportsouthofWilmingtonandtheUniversityofDelawareEnvironmentalEarthObservationalSystem(DEOS)(http://www.deos.udel.edu/).InformationandmapsforprecipitationwereretrievedfromtheNationalWeatherServiceAdvancedHydrologicPredictionServicewebsite(http://water.weather.gov/precip/).MapsofdailymaximumregionalozoneconcentrationswereretrievedfromtheEPAAirNOWmaparchive(http://www.epa.gov/airnow/2009/).Five-minuteobservationswereretrievedfromtheNationalClimateDataCenterAutomatedSurfaceObservationSystems(NCDCASOS)astextfiles.CopiesofdatausedinthisanalysisareincludedinAppendixC—dataCD.ResultsDateswithlowregionalozone8-hourmaxima(lessthan50ppb)andmeteorologyconsistentwithlowozoneconcentrationswereidentified.SpecificmeteorologyfortheWilmingtonareawasexaminedandsupportingevidenceforlowozoneconcentrationsattheBrandywinesitewasidentifiedaslistedinTable4.DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI14Table4Primaryevidence-meteorologyAdditionalevidence—regionalconcentrationsDatePrecipitationCloudCoverWindAirNOWMap-Regional03Max.Data5/14/2009xx6/23/2009x6/30/2009xx7/3/2009xx7/4/2009xx7/23/2009xxx8/6/2009xx8/7/2009x8/13/2009xx8/28/2009xx8/29/2009xx8/31/2009x9/1/2009x10/7/2009x10/9/2009x10/21/2009xDatesidentifiedashavingsignificantcloudcoverareidentifiedintheASOSdatafiles(appropriatereadingsshowninred).Inaddition,hourlysolarradiationlevelsfromtheNWSandDEOSwebsitesweregraphedasshowninAppendixB.DatesidentifiedashavingprecipitationeventsareshowninAppendixBasASOSprecipitationmaps(mapsareshownbyZtimesodateshownappearstobethedayaftertheEDTdate).Somedateswithoutprecipitationorcloudcoverdidhaverelativelyhighwindspeeds;thesedatesareincludedintheASOSandDEOSdatafilesinAppendixCandshowninTable4above.Whenprecipitation,cloudcover,andwindspeeddidnotprovidesufficientevidenceforconditionsunfavorableforozoneformation,AirNOWregionalozonemapsweregeneratedassupplementalevidencethattheBrandywinesitewouldnothaverecordedhighambientconcentrationsofozone.ThemapsforthesedatesareshowninAppendixB.Asdemonstratedinthe2010missingBrandywineozonedataanalysis,concentrationsatBrandywinearehighlycorrelatedwithconcentrationsatnearbyregionalsitesandthereforeverylowconcentrationsatnearbysiteshaveahighprobabilityofbeingrepresentativeofconcentrationsatBrandywine.DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI15ConclusionAnalysisofmeteorologicalconditions,precipitationrecords,andregionalozonemapsshowedthat16daysidentifiedinTable4werelikelytorepresentlowozoneconcentrationsformissingdaysattheBrandywinemonitoringsite.AsshowninTable4,sevendaysrecordedprecipitationevents,eightdayshadcloudcover/lowsolarradiationrecords,fourdayshadhighaveragewindspeeds,andsevendayshadlowregional8-hourmaximumozonelevels.Inreviewingalltheprimaryandsupplementalinformation,the16daysarebeingproposedbyDelawareasappropriatefortheuseofthenulldatacode“BG”arelistedbelow.Datesproposedforuseof”BG”5/14/20096/23/20096/30/20097/3/20097/4/20097/23/20098/6/20098/7/20098/13/20098/28/20098/29/20098/31/20099/1/200910/7/200910/9/200910/21/2009Withthe16additionaldaysassumedtobelessthanthestandard,combinedwiththepreviouslyaccepted55days,datacompletenessforBrandywinein2009is86%.Incombinationwiththe26additionaldaysfor2010,thefinalthreeyearaveragedatacapturefor2008—2010forBrandywinewouldbe93%andmeetstheminimumrequirementof90%asstatedin40CFRPart50AppendixISection2.3(b).DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePage16APPENDIXA-Procedures2010ozonedataanalysis(1)DownloadambientmonitoringdatafromAQS(maximumdaily8-hrozonevalues,AMP435Report).a.Thedailymaximum8-hrvaluesareidentifiedincolumn“DailyMaxSampleValue”whenthe“Duration”columnequals“8-HRRUNAVGBEGINHOUR”.b.Datafromthefollowingsitesweredownloaded:TableAl.AQSSITEIDCOUNTY,STATESITENAME10-003-1010NewCastleCounty,DEBrandywine10-003-1013NewCastleCounty,DEBellefonte210-003-1007NewCastleCounty,DELumsPond42-029-0100ChesterCounty,PANewGardenAirport42-045-0002DelawareCounty,PAChester34-007-1001Camden,NJCamden34-015-0002GloucesterCounty,NJClarksboro24-015-0003CecilCounty,MDFairHill(2)Analyze2006-2010Ozonedataa.Createatableofdaily8-hourmaxima.b.Calculateadailyregionalmaximumusingthehighestvalueamongallsitesforeachday.c.PerformlinearregressionanalysisbetweenBrandywineandtheregionaldailymaximad.Evaluatelinearregressionresultsandusetocalculatemissingdailymaxima.(3)AlldownloadeddataareincludedintheattachedCDasAppendixC.2009ozonedataanalysis(1)DownloadambientmonitoringdatafromAQS(maximumdaily8-hrozonevalues,AMP435Report).a.Thedailymaximum8-hrvaluesareidentifiedincolumn“DailyMaxSampleValue”whenthe“Duration”columnequals“8-HRRUNAVGBEGINHOUR”.b.Datafromthesamesitesusedinthe2010dataanalysisandlistedinTableAlweredownloaded.c.Identifydateswithregionallowozonedaily8-hourmaxima(lessthan70ppb)notalreadyacceptedfornulldatacode“BG”.(2)DownloaddailymeteorologicaldatafortheNationalWeatherServicesiteatNewCastleCountyAirportsouthofWilmingtonusingtheUniversityofDelawareEnvironmentalEarthObservationalSystem(DEOS)(http://www.deos.udel.edu!).InformationandmapsforprecipitationwereretrievedfromtheNationalWeatherServiceAdvancedHydrologicPredictionServicewebsite(http://water.weather.gov/precipl).MapsofdailymaximumDEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI17regionalozoneconcentrationswereretrievedfromtheEPAAirNOWmaparchive(http://www.epa.gov/airnow/2009/).(3)Assessmeteorologicalconditionstoidentifydaysnotconducivetoozoneformation(precipitation,cloudcover,highwinds,etc.)(4)AlldownloadeddataareincludedintheattachedCDasAppendixC.DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePage18APPENDIXB-OzoneDataTablesandFigures2010Daily8-hourozonemaximaEstimatedsubstituteddataassumedbelowNAAQSbasedonregressioncalculationondatafromothersites;countedtowardsdatacompletenessEstimatedsubstituteddataassumedaboveNAAQSbasedonregressioncalculationondatafromothersites;notcountedtowardsdatacompletenessMeasuredregional8-hourmaxondaysofBrandywinemissingdataTableBI—2010daily8-hourozonemaxima2>.I0‘-I0‘-Ien000‘-IQ.—-U,2(D-rn-i-gZe.lE—rn—(.40JOa)00—aI0r1rn9-CcJ=1)(.4000Lfl024-IInrJwoIoo9—U,0Orn.0c)rn-o=0=0UDate4-IU,C’3I-)a)2C00U,E-I00‘-Ien000a)4-IIna)4I0O.LflCaJ.01(0a)2I0.Cobx(0ECO(0C04/1/201000430.0380.040.0460.0490.0490.0494/2/20100.0480.050.0410.0520.0480.0490.0520.0524/3/20100.0370.0390.0360.0450.0370.040.0390.0454/4/20100.0570.060.0540.0570.0510.0570.0550.0604/5/20100.0580.0630.0560.060.0630.0620.0630.0634/6/20100.0640.0550.0640.0490.0640.0620.0590.0620.0644/7/20100.0680.0580.0680.0520.0660.0640.0660.0640.0684/8/20100.0580.0460.0560.0530.0560.0560.0580.0560.0584/9/20100.040.0380.040.0370.040.0370.0420.0380.0424/10/20100.0490.0460.0480.0470.0470.0470.0520.0470.0524/11/20100.0730.0640.070.0620.0680.0680.070.070.0734/12/20100.0560.0520.0530.0520.0520.0520.0570.0530.0574/13/20100.0350.0390.0320.030.0350.0380.0310.0394/14/20100.0550.0540.0490.0520.0520.0560.0520.056DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI194/15/20100.0630.0590.0590.0580.0580.060.0550.0590.0634/16/20100.0470.0420.0560.0480.0540.0550.0530.0564/17/20100.0410.0390.0430.0410.0360.0420.0380.0434/18/20100.0310.0320.0310.0320.0280.0330.030.0334/19/20100.0470.0450.0450.0440.0430.0470.0440.0474/20/20100.0490.0450.0510.0480.0450.0490.0460.0514/21/20100.0390.0390.0480.0450.0360.0410.0370.0484/22/20100.0610.0610.0560.0580.0550.0580.0614/23/20100.0550.0530.0520.0510.0520.0490.0540.0510.0554/24/20100.0510.0490.0540.0490.0540.0490.0530.050.0544/25/20100.0440.040.0450.0450.0420.0420.0470.0420.0474/26/20100.0310.0290.0390.030.0290.0320.030.0394/27/20100.0490.0470.0490.0480.0480.0470.0520.0480.0524/28/20100.0420.0390.040.0380.040.0390.0430.0390.0434/29/20100.0530.050.0520.0490.0510.050.0530.050.0534/30/20100.0710.0640.0690.0570.0670.0690.0670.0690.0715/1/20100.0750.0680.0730.0620.0730.0780.0720.0770.0785/2/20100.0450.0490.0410.0390.0460.0490.0460.0440.0495/3/20100.0450.0420.040.0420.0420.0380.0420.0455/4/20100.0620.0580.0640.0540.0620.0580.0630.0590.0645/5/20100.0640.060.0690.0620.0680.0640.0660.0660.0695/6/20100.0640.0610.070.060.0650.0590.0650.060.0705/7/20100.0460.0420.050.0460.0480.0460.0480.0460.0505/8/20100.050.0480.0570.0490.0520.0480.0540.0470.0575/9/20100.0430.0410.0430.0420.0420.040.0460.0410.0465/10/20100.050.0480.0510.0480.0490.0460.0510.0480.0515/11/20100.0420.0410.0480.0460.0470.050.0505/12/20100.0380.0340.0410.0410.0390.0460.0390.0465/13/20100.050.0470.0530.0490.0540.0490.0540.0490.0545/14/20100.0540.0490.0520.0480.0560.0540.0510.0565/15/20100.0520.050.0530.050.050.0540.050.0545/16/20100.0470.0450.0510.0480.0490.0490.0450.0515/17/20100.0410.0390.0470.0410.0430.0490.0430.0495/18/20100.0420.0380.0470.0340.0440.0420.0480.0410.048DEDAQMissingOzoneDataAnalysis2010andSupplemental2009forBrandywinePageI205/19/20100.0350.0340.0370.0330.0330.0330.0370.0340.0375/20/2010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