SALTRIVERPIMA-MARICOPAINDIANCOMMUNITY10005EastOsbornRoad/Scottsdale,Arizona85256-9722/Phone(480)362-7400/Fax(480)362-7593December4,2013JaredBlumenfeld,RegionalAdministratorU.S.EnvironmentalProtectionAgency,RegionIX75HawthorneStreetSanFrancisco,CA94105RE:AreaDesignationof2012RevisedPrimaryAnnualPM2.5NationalAmbientAirQualityStandardforSaltRiverPima-MaricopaIndianCommunityDearMr.Blumenfeld,TheSaltRiverPima-MaricopaIndianCommunity(SRPMIC)isafederallyrecognizedtribeinterestedtoprovidetheopportunitytoparticipateintherecommendationprocessfordesignatingareasfortheEnvironmentalProtectionAgency’s(EPA)NationalAmbientAirQualityStandard(NAAQS)on2012revisedprimaryannualPM2.5pollutant.TheproposedprocessesregardstoDecember14,2012,whenEPArevisedtheprimaryannualPM2.5NAAQSthatstrengthenthestandardfrom15.0microgramspercubicmeter(uglm3)to12.0ug/m3,butretainedtheexisting24-hourPM2.5standardat35ug/m3ThesedesignationprocessbasedonCleanAirAct(CAA)section107(d)requiresdesignatingallareasofthecountryinatimelymannerfollowingpromulgationofaneworrevisedNAAQS.WerecognizeEPA’smissionistoprotecthumanhealthandtheenvironmenttosetlimitsonlevelsofcertainairpollutantstoensurenecessaryhealthandenvironmentalprotectionsaswellasprovidingsupportandfundingforairqualityagencies.WeappreciatetheopportunitytosubmitourrecommendationoftherevisedprimaryannualPM2.5NAAQSareadesignation.TheSRPMIChascollectedsufficientairqualityinformationtodeterminetheareaismeetingtheNAAQS.ThethbalairqualitydataiscertifiedannuallyinEPA’sAirQualitySystem(AQS)andthedataissufficientqualitytobeusedfordesignationpurposes.TheairqualitystatusofPM25concentrationdesignvaluesfor2010to2012iswellbelowtheNAAQSstandardtherefore,theCommunityisrecommendingtheareatobedesignated“attainment”.TheSRPMICprovidesanattacheddocumentofairqualitydatainformationthatsupportsthearearecommendationto2012revisedprimaryannualPM2.5NAAQAdesignation.ShouldyouhaveanyquestionsorconcernswithcommentsaddressedwithChristopherHoran,EnvironmentalProtection&NaturalResourcesDivisionManagerat480-362-7639orchristopher.horan@srprnic-nsn.gov.Sincerely,MartinHarvier,VicePresidentSaltRiverPima-MaricopaIndianCommunityCc:ChristopherHoran,CDD-EnvironmentalProtection&NaturalResources,DivisionManager2AnalysisFactorofPM2.5DesignationAnalysisFactorinSupportof2012RevisedAnnualPM2.5AreaDesignationSaltRiverPima-MaricopaIndianCommunity(SRPMICorCommunity)islocatedinMaricopaCounty,AZ,issituatedwithinalargemetropolitanregionwithapopulationofover3millionpeoplethatincludesthecitiesofMesaandTempetothesouth,thecitiesofPhoenixandScottsdaletothewestandthecitiesofFountainHillsandScottsdaletothereservation’snorthernboundary.TheSRPMIC,establishedbyExecutiveOrderin1879,ishometoover10,000O’Odham(Pima)andPiipaash(Maricopa)membersresidingwithina54,000acrereservationland.TheSRPMIC’slocationwithinadenseurbanregionresultsinabroadrangeofeconomicdevelopmentandlanduseswhich,inturn,leadtovarietyofpollutionsources.TheSRPMICincludes12,000acresofagriculturalcultivation,largescaleaggregateminingoperationaswellaslandfilloperations.ThecontinuedurbanizationoftheregionhasalsoencroachedontheCommunityboundaries,withmajorhighwayssuchasthePimaLoop101(HwylOl-PimaFreeway),Loop202(RedMountainFreeway)andBeelineHighway(AzHwy87)coursingthroughtheCommunity.MapiPM2.5DesignateSiteMap0520’niOMM..$5S1rCWI.I,I0C10013November14,20131:37706903235t3r,[150000-500,000QDaily•PLASK_UATIV_11IIJ.IU•0-120500,0011000,000QrinualQ0AS1CAjESERM1TlCNS•121-190Q1,000001andaboveJBat),LOWER4S_TR)EES1AnalysisFactorofPM2.5DesignationInresponsetoAreaDesignationof2012RevisedPrimaryAnnualPM2.5NationalAmbientAirQualityStandard(NAAQS)lettertotheSRPMIC,theCommunityrecommendstheSRPMICtribalcommunitybein“attainment”statusbasedonthedataanalysisprovidedalongwithaccompanyingfactorsforthePM2.5designationprocess.ThedesignvaluePM2.5concentrationwithinSRPMICairqualitystatusislowerthantheNAAQSlevel.ThePM2.5ismonitoredattheSRPMIC’sSeniorCenterairmonitoringstationwhichisdesignatedasStateandLocalAirMonitoringStation(SLAMS)Tribalmonitoringstation,AQSsiteID040137020inMaricopaCounty,AZ.Thedatacollectedfromthismonitorisaregulatorymonitorincompliancewith40CFRPart58AppendixAandhaveadequatelyachievedthequalityassuranceanddatarequirementsforannualdatacertifications.ThePM2.5annualdesignvaluefor2010to2012inGraph1showtheSRPMICsitemonitorSeniorCenterat5.6ug/m3alongwithsitemonitorsWestPhoenixandSouthPhoenixfromMaricopaCountyandonesitemonitorSuperSitefromthe(State)ArizonaDepartmentofEnvironmentalQuality(ADEQ).AlsographedisthePM2.5annualdesignvaluefor2009—2010thatallgraphsshownarebelowtheNAAQSstandardandSeniorCenterannualdesignvalueisthelowestofthefourmonitors.16.014.012.0__.-4.0PM2.5AnnualDesignValue2010-2012——PM2.5AnnualDesignValue2009-20112.0—_—2012Standard—2011Standard0.0---__________________WestPhoenixSouthPhoenixSeniorCenterSuperSitePM25AnnualDesignValues2010-2012and2009-2011oftheState,MaricopaCountyandSRPMICSiteMonitorsGraphI2AnalysisFactorofPM2.5DesignationMap2ofPM2.5DesignValueAnnual2010—2012belowisthelocationsofsitemonitorswithidentifiedvaluesofconcentrationonthemapandSeniorCenteris5.6uglm3.ThesitesdirectlywestfromSeniorCenterlocationareADEQSuperSitewith8.2ug/m3concentrationatadistanceapproximately16milesandtheMaricopaCountysiteWestPhoenix10.3ug/m3atapproximately20miles.Towardssouthwestwithvalueof9.1ug/m3isMaricopaCountysiteSouthPhoenixatapproximately17milesandattheeastlocationwith7.0ug/m3isApacheJunctionsiteinPinalCountyatapproximately26miles.TheSRPMIC’sPMdataindicatesthelowestofthefivelocationsforthe2010-2012annualdesignvaluefortheareathatevidentlywouldcategorizeasattainmentarea.Allofthesitesannualdesignvaluesarebelowthe2012PM2NAAQSstandardat12ug/m3.PM2.5DesignValueAnnual2010-2012M9p2November102013r.:O1000001andaboveODaily0Qoth•A$K_NATIVEVU.ES0IDLOWE0jES1754137•0..120•121.190-,N.*1000lQCountyBoundariee000000000‘$03

# Analysis

Iactor

of PM 2 . 5 Designation The annual

average concentrations

of PM 2 . 5

at the SRPMIC

locations

have shown

a general decline

since

2005

and leveled

out

in 2011

and 2012.

A graph

of the three-year

moving

averages of

the annual

design

value

PMj

is provided

in Graph

2. Data collected

during

2007

was included

in the moving averages

although

data recovery

for that

year

was

less

than

75%. The graph indicates

the concentrations

of PM 2 . 5

have decreased

through

the years

for Annual Design

Value

and

the

last

two years

are wefl below

the level

of

the NAAQS

new

2012 annual standard

at

12 uglm 3 . 16 14 12 1(1

6 4 0 Graph

2 2005-2007

2(X)6-2008

2007-200’)

2008-2010

2009-2011

2010-2012 Three-year

Moving Averages

of Annual

Design

Value

PM 25 Concentrations SPRMIC

2005- 

# 2012 ‘——Senior

Center Standard

4AnalysisFactorofPM25DesignationConcentrationsofPM2.5arewellbelowthestandard.Agraphofthethree-yearmovingaveragesofthe98thpercentileofthe24-houraverageconcentrationsisprovidedinGraph3.Datacollectedduring2007wasincludedinthemovingaveragesalthoughdatarecoveryforthatyearwaslessthan75%.Graph3Three-yearMovingAveragesof24-HourPM,598thPercentilesSRPMIC2005-2012403530252015——SeniorCenterStandardI002005-20072006-2002007-2009200K-2()102009-201I2010-20I25