Bryan W. Shaw, Ph.D., P.E., Chairman Toby Baker, Commissioner Zak Covar, Commissioner RichardA. Hyde, P.E., Executive Director 

## TEXAS COMMISSION ON ENVIRONMENTAL QUALITY Protecting Texas byReducing andPreventing Pollution 

### May22, 2015

Mr. Ron Curry Administrator Environmental Protection Agency, Region 6 Fountain Place 12th Floor, Suite 1200 1445 Ross Avenue Dallas, Texas 75202-2733 Subject: Addendum to Requestfor Determination ofAttainment ofthe 1997 EightHour Ozone Standardfor the Houston-Galveston-Brazoria (HGB) and Dallas-FortWorth (DFW) Areas and Request for a One-Year Extension of the HGB 2008 Eight-Hour Ozone StandardAttainment Date Dear Mr. Curry: Based on a conversation with the United States Environmental Protection Agency (EPA) Region 6 staffregarding the requirements for a one-year extension ofthe attainment deadline for the HGB 2008 eight-hour ozone nonattainment area, theTexas Commission on Environmental Quality (TCEQ) submitsthis addendumtotheFebruary 27, 2015 letterto theEPA which is enclosedfor your reference. Inthe February 27letter, theTCEQ requestedthatthe EPA issue a determination of attainment, also known as a clean data determination, ofthe 1997 eight-hour ozone National Ambient Air Quality Standard (NAAQS) for the HGB and DFW nonattainment areas. Under 40 Code ofFederal Regulations (CFR) §51.1118, an EPA determination that an area is attaining the 1997 eight-hour ozone NAAQS suspends certain state planning requirements related to attainment ofthe standard. TheTCEQ also requested a one-year attainmentdate extension toJuly 20, 2016, for the HGB 2008 eight-hour ozone NAAQS marginal nonattainment area in accordance with Federal CleanAir Act, §181(a)(5). The HGB area meets the monitoring data requirement with a 72 partsperbillion fourth highest daily eight-hour monitored average inthe I-!GB 2008 ozone nonattainment area as measured atthe Conroe Relocated monitor (C78/A321) in 2014. The Februm-y 27, 2015 letter indicated that TCEQ submitted a base year emissions inventory state implementation plan revision to EPA onJuly 16, 2014, to comply with P.O. Box 13087 • Austin, Texas 78711-3087 • 512-239-1000 • tceq.texas.gov How is our customer service? tceq.texas.govjcustomersurvey p1 inlecl on recyclecl pape1 usmg**vegel<~ble"b<Jsecl** ink

### Mr. Ron Curry Page 2 

### May 22, 2015 

### marginal area requirements for the 2008 eight-hour ozone NAAQS. In addition, the TCEQ certifies thatthe state is implementing all requirements and commitments pertainingto the areain the applicable ozone implementation plan. If

### youhave questions orneed additional information, please contact David Brymer, Director ofthe Air Quality Division, at (512) 239-1725. Sincerely,

RichardA. Hyde, P.E., Executive Director Texas Commission on Environmental Quality Enclosure RH/DB/lb

ce: Wren Stenger, Multimedia Planning & 

### Permitting Division, EPA Mark Hansen, Multimedia Planning & 

### Permitting Division, EPA Guy Donaldson, Multimedia Planning & 

### Permitting Division, EPABryan VV 3ht.n._..,.·, Ph.D_, P.E.. Chairman Tuby**!~n**ker.**Cnmmis:;fonj~t** Z.1k Covar,**Cnmmi.>~sioner** RichardA. Hyde. P.E., Execl.tliue Director ·-;



## TEXAS COMMISSJON ON ENVIRONMENTAL QUAU1Y

Mr. Ron Cun·y Administrator Protecting Texw; hy Reducing andPreventiny Pollution
February 27, 2015

Environmental ProtectionAgency, Region 6 Fountain Place 12thFloor, Suite 1200 1445 Ross Avenue Dallas, Texas 75202-2733 Re: Request for Determinauon ofAttainment ofthe 1997 Eight-Hour Ozone Standard For the Houston-Galveston-Brazoria (HGB) and Dallas-Fort Worth (DFW) Areas and Request for a One-Year Extension ofthe HGB 2008 Eight-Hour Ozone StandardAttainment Date Dear Mr. Curry: TheTexas Commission on Envil'Onmental Quality (TCEQ) requests that the United States Environmental Protection Agenc'Y (EPA) issue a determination ofattainment, also known as a clean data determination, ofthe 1997 eight-hour ozone National Ambient Air Quality Standard (NAAQS) for the HGB and DFW nonattainment areas. Under 40 Code ofFederal Regulations (CFR) §51.918 as well as pmpused CFR §51.1118, an EPA determination that an area is attaining the 1997 eight-hour owne :\;\AQ.S suspends certain state planning requirements related to attainment ofthe standard. This determination orattainment reqnestis based on complete, quality-assured, certitled ambient air monitoring data that show the HGB andthe DFW areas have monitored attainment ofthe 1997 eighthour ozone NMQSfor 2012 through 2014. The HGB urea monitored attainment ofthe standard with an So partsperbillion {ppb) design value, and the DFW area with an 81 ppbdesign value. The 2014 Annual Data Certification was submitted to the EPA Feb!'Llary 24, 2015. TheTCEQ also requests a one-year attainment elate extension to .July 20, 2016 for the HGB 2008 eight-hour ozone NAAQS marginal nonattainment area in accordance with Fedct·al Clean Air Act, §181(a)(5). The TCEQ certifies that the state has complied with all marginal requirements and commitments pertainingto the HGB area by submitting a base year emissions inventory state impletnentntion phm revision to the EPA on .July 16. 2014. The 11GB area also meets the monitoring data requirement with a 72 ppb fourth highesl daily eight-hour monitored average in the HGB 2008 owrw nonattainnwnl area as measured at the Conroe Relocated monitor (C78/A321) in 2014.Mr. Curry Page 2 Fehntary 27. 20l5
Ifyou have questions or need additionallliformalion please contaet David Brymer, Direetm· of the Air Quality Division, at (512) 239-1725. Sincerely, t") 

## ;_\

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## t ·''·'"'}"'' '•·- Richard A. Hyde, P.E.,'iixecutive Director Texas Commission on Envimnmental Quality RII/DilJih
t:c: Ms. Wren Stenger, Multimedia l'lanning & Pet·mitting Division, EPA Mr. Mark Hansen, Multimedia Planning & Permitting Division, EPA Mr. Guy Donaldson, Multimedia Planning & PermittingDivision, EPA