Mr. Richard A. Hyde 

Executive Director 

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION6 

1445 ROSS AVENUE, SUITE 1200 

DALLAS TX 75202-2733 

Texas Commission on Environmental Quality, MC 165 

Post Office Box 13087 

JUN 1 0 2015 

Austin, TX 78711-3087 

Dear Mr. Hyde: 

The U.S. Environmental Protection Agency (EPA) Region 6 has concluded its review of the 

Texas Commission on Environmental Quality's (TCEQ) early 2014 certification of the ozone (OJ) 

ambient air monitoring data for completeness to ensure it meets the requirements ofTitle 40 of the 

Code ofFederal Regulations (CFR) Part 58 and its appendices. Specifically, our review addressed the 

OJ data for the Houston-Sugarland-Baytown Metropolitan Statistical Area (MSA) including Brazoria, 

Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller Counties (County Codes 

039, 071, 157, 167,201,291, 339, and 473, respectively). 

A separate review addressed the OJ data for the Dallas-Fort Worth MSA and Navarro County. This 

review was detailed in my letter to you dated March 31, 2015. 

We are pleased to inform you that we have determined the 2014 OJ data for these specific counties met 

aH the data quality requirements. We are also very pleased that the Houston area 's air quality has 

improved so that it is currently meeting the 1997 8-hour ozone air quality standard (i.e. below 85 parts 

per billion). The TCEQ has entered the recommended data annotations or data evaluation flags of"Y" 

into the EPA's national air monitoring database (AQS) to demonstrate that the 2014 03 data for these 

counties have been through the TCEQ's validation process and have been loaded into the database. We 

have entered evaluation flags of "Y" for the 03 monitors for these counties in the AQS database for 

2014 to reflect that the TCEQ has completed the data certification process for these monitors and the 

EPA has no unresolved reservations about the data quality. This information is reflected in the enclosed 

Certification Evaluation and Concurrence Report (AMP600). 

We appreciate the TCEQ's efforts to prepare and submit the early certification package for the 2014 OJ 

data for counties within the Houston MSA. We look forward to working with the TCEQ on the 

evaluation of the remaining 2014 data certifications. If you have any questions, please contact me at 

(2 14) 665-7548 or your staff may contact Ms. Trisha Curran of my staff at (214) 665-8345. 

Mark Hansen 

Acting Associate Director for Air Programs 

Enclosure 

Internet Address (URL) • http://www.epa.gov/region6 

Recycled/Recyclable • Printed with Vegetable Oil Based Inks on 100% Postconsumer, Process Chlorine Free Recycled Paper 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

User ID : CTI CERTIFICATION EVALUATION AND CONCURRENCE 

Report Requ e st ID : 1337335 Rep ort Code: AMP600 

GEOGRAPHIC SELECTIONS 

'l'riba1 

Code S tate County Site Parameter POC City AQCR UAR 

48 0 39 

48 07 1 

48 157 

48 167 

48 201 

48 2 91 

48 339 

48 473 

PROTOCOL SELECTIONS 

~ I AGENCY SELECTIONS 

Parameter 

Classification Parameter 

Texas Commission On Environmental Quality Method 

CRITERI A 44201 

SELECTED OPTIONS 

Op t ion Type 

. ERGE PDF FILES 

AGENCY ROLE 

G ----·-·----

DATE CRITERIA 

rt Date End Date 

2014 2014 

Option Va lue 

YES 

CERTIFYING 

Selection Criteria Page 1 

CBSA 

May. 27 , 2015 

EPA 

CSA Regi on 
Data Evaluation and Concurrence Report Summary May . 27, 2 015 

Certification Year: 2014 

Certifying Agency (CA): Texas Commission On Environmental Quality (1.035) 

Pollutants in Report: Monitors Monitors Recommended for Monitors NOT Recommended 

Parameter Name Code Evaluated Concurrence by AQS for Concurrence by AQS 

Ozone 44201 20 20 0 

PQAOs in Report: 

PQAO Name PQAO Code TSA Date 

Texas Commission On Environmental Quality 1035 09/07/10 

Summary of 'N' flags for all pollutants: AQS Cert. Agency 

Parameter Recommended Recommended 

PQAO Code AQS Site-10 POC Flag Flag Reason for AQS Recommendation 

Signature of Monitoring Organization Representative: 

Page 1 of 1 
Data Evaluation and Concurrence Report for Gaseous Pollutants 

Certifying Year 

Certifying Agency Code 

Parameter 

QAO Name 

PP Approval Date 

NPAP Audit Summary: 

2014 

Texas Commission On Environmental Quality (1035) 

Ozone (44201) (ppm) 

Texas Commission On Environmenta I Quality (1 035) 

11 /07/2012 

Number of Valid Audits NPAP Bias Gtite ·ia Met 

11 1.48747 y 

Routine Data One P 'oint Quality Check 

as POC Monitor Mean Min Max Precl 

ite 10 Type 

SLAMS 0.040 0.010 0.135 

SLAMS 0.038 0.011 0.089 

8-167-1034 1 SLAMS 0.042 0.013 0.096 

8-20Hl024 2 SLAMS 0.042 0,01 1 0.093 

8-201-0026 3 SLAMS O.D39 0.011 0.089 

8-201-0029 2 SLAMS 0.039 0.014 0.084 

8-201-0046 1 SLAMS 0.039 0.009 0.080 

8-201-0047 2 SLAMS 0.040 0.010 0.083 

8-20 1-0051 2 SLAMS 0.040 0.010 0.093 

8-201-0055 1 SLAMS 0.040 0.011 0.095 

8-201-0062 1 SLAMS 0.038 0.007 0.107 

8-201-0066 1 SLAMS 0.040 0.013 0.090 

8-201-0416 1 SPM 0.039 0.008 0.097 

8-201-1015 1 SLAMS 0.037 0.010 0.080 

8-201-1017 1 SLAMS 0.043 0.013 0.090 

8-201-1034 2 SLAMS 0.040 0.010 0.090 

8-201-1035 3 SLAMS 0.036 0.009 0.081 

SLAMS 0.039 0.010 0.107 

SLAMS 0.040 0.007 0.083 

SLAMS 0.046 0.016 0.091 

- -

Exceed. Outlier Perc. 

Count Count Comp. 

1 0 99 

0 0 98 

0 0 98 

0 0 96 

0 0 99 

0 0 97 

0 0 98 

0 0 99 

0 0 98 

0 0 97 

0 0 98 

0 0 95 

0 0 96 

0 0 98 

0 0 98 

0 0 96 

0 0 98 

0 0 98 

0 0 98 

0 0 99 

1 

2 

2 

1 

1 

0 

0 

2 

0 

2 

0 

0 

slon Bias Complete 

.08 +/-0.81 100 

46 +/-1.24 100 

36 +3.30 100 

.95 +/-2.23 100 

71 +2.06 100 

03 -1.97 100 

45 +/-1.05 100 

26 +2.31 77 

79 +/-0.64 100 

96 -1 52 100 

99 +/-2.50 100 

61 -1 .31 100 

96 +/-1.58 100 

46 -4.36 92 

26 +/-1.44 100 

37 +/-1.40 100 

97 +/-1.53 100 

35 +/-1.36 100 

86 +/-0.48 100 

83 +/-0.57 96 - ···-

-

Annual PE NPAP ,-·- Concur. Flag 

Bias Complete Bias PQAO level QAPF Aqs Rec CA Rec Epa 

Criteria Appr. Flag Flag Concur 

- 2.15 100 y y y y y 

- 8.79 100 y y y y y 

4.62 100 y y y y y 

- 2.56 100 y y y y y 

0.78 100 y y y y y 

- 3.63 100 y y y y y 

- 1.37 100 1.51 y y y y y 

- 2.47 100 y y y y y 

- 6.30 100 y y y y y 

- 3.48 100 y y y y y 

- 8.55 100 y y y y y 

- 8.23 100 y y y y y 

- 6.60 100 y y y y y 

- 7.74 100 y y y y y 

- 4.13 100 y y y y y 

1.74 100 y y y y y 

- 0.74 100 y y y y y 

- 7.17 100 y y y y y 

- 1.09 100 y y y y y 

1.14 100 y y y y y 

- - . ··-·-- ... .....