UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 6 1445 ROSS AVENUE, SUITE 1200 DALLAS, TX 75202·2733



### JAN 

### 1 2 20n

Mr. Steve A. Thompson Executive Director OklahomaDepartment ofEnvironmental Quality Post Office Box 1677 OklahomaCity, OK 73101-1677
DearMr. Thompson:
The U.S. Environmental Protection Agency (EPA) Region 6 has completed its analysis ofthe OklahomaDepartment ofEnvironmental Quality (ODEQ) 2010 Annual AirMonitoring NetworkPlan to ensure itmeets those requirements of40 CFRPart 58 and its appendices that confer approval authority on the Regional Administrator. We appreciate your cooperation and workto prepare and submit your 2010 annual network plan forreview. EPA approves your networkplan, in accordance with 40 CFR 

### § 58.10 and 

### § 58.14. Technical comments are addressed in the enclosure.
We look forward to working with ODEQ on the implementation ofthe future, revised ozone National Ambient Air Quality Standards (NAAQS) monitoring regulations as well as finalized nitrogen dioxide, sulfur dioxide and lead NAAQS monitoring regulations. New requirements in monitoring may need to be addressed in your 2011 annual networkplan, along with your schedule for operation.
Ifyou have any questions, please contactme at (214) 665-2100, or your staffmay contactMs. MariaMartinez ofmy staffat (214) 665-2230.

Enclosure

RecycledIRecyclabie. Printed wnh Vegetable 011 Based Inks on 100% Recycled Paper (40% Postconsumer)Technical Comments on ODEQ 2010 Annual AirMonitoring NetworkPlan
Ozone:
Due to the future proposedreconsideration ofthe primary and secondary ozone National Ambient Air Quality Standards, we recommend that the South Lawton State and Local AirMonitoring Station (SLAMS) ozone site (AQS Site J.D. #40-031-0649) continue ozone monitoring through 2010.
We approve two minor changes associated with the current 2010 ODEQ air monitoring network. The current ODEQ ozone networkis satisfactory. Region 6 approves ODEQ's proposal to move the SouthLawton ozone monitor (AQS Site J.D. #40-031-0649) to the Walters site (AQS Site J.D. #40-033-0680) after the end ofthe 2010 ozone season. See 40 CFR 

### § 58.14(c) andPart 58, App. D, 2(d).
PM: ODEQ meets the minimum PM2.5 SLAMS sites requirements bymaintaining the Northwest 5th and Sharte1 site (AQS Site J.D. #40-109-0035-collocated) andthe OklahomaChristian University site (AQS Site J.D. #40-109-1037) in Oklahoma City and the 15th Street site (AQS Site I.D. #40-143-0110) and the NorthPeoria site (AQS Site J.D. #40-143-1127) in Tulsa. However, ODEQ must collocate the highest PM2.5 SLAMS site in Tulsato satisfy QualityAssurance IQuality Control requirements. See 40 CFRPart 58, App. A, 3.2.5, etseq. After ourreview ofPM2.5 historical data for the Southeast 1st Street site (AQS Site J.D. #40-097-0186) (with data at 67% ofthe PM2.5 NAAQS) and the Emporia site (AQS Site J.D. #40-101-0169) (at 74% ofthe PM2.5 NAAQS), Region 6 approves your proposal to terminate these two sites. We conclude discontinuance does not compromise data collectionneeded for implementation ofthe PM2.5 NAAQS and Part 58, App. D will continue to be met. See 40 CFR 

### § 58.14(c) and Part 58, App. D, 4.7.1(a).
The ODEQ PMlO SLAMS sites are the Northwest 5th and Shartel site (AQS Site I.D. #40-109-0035-collocated) and the Oklahoma ChristianUniversity site (AQS Site J.D. #40-109-1037) in Oklahoma City and the 15th Street site (AQS Site J.D. #40-143-0110) and the South Cincinnati site (AQS Site J.D. #40-143-0191) in Tulsa. You also operate a PM10 site at the Muskogee Water TreatmentPlant (AQS Site J.D. #40-101-0167). Based on the currentPMlO sites in operation, ODEQ meets the minimum PM10 SLAMS sites requirements. See 40 CFRPart 58, App. D, 4.6, etseq. and App. A, 3.3.1 etseq. Due to the low ambient concentrations ofPMlO at the South Cincinnati site (AQS Site J.D. #40-143-0191) in Tulsa, ODEQ may want to re-evaluate this site. Anyrequest for a systemmodification under 40 CFR 

### § 58.14(c) shouldbe submitted inwriting to EPA Region 6.

### co: Region 6 approves the CO network change to discontinue monitoring at the South Cincinnati site (AQS Site I.D. #40-143-0191) in Tulsa, since the current CO levels are very low (only 13%-14% ofthe current 8-hourCO NAAQS standard). We conclude that the discontinuance does not compromise the data collectionneeded for implementation of the CO NAAQS and Part 58, App. D will continue to be met. See 40 CFR 

### § 58.l4(c) and Part 58, App. D, 4.2(a). EPA Region 6 also approves the move ofthe CO Special Purpose Monitor currently at the Northeast 10th and Stonewall site (AQS Site lD. #40"109-0033) to the Oklahoma Christian University site (AQS Site LD. #40-109-1037). This is due to the current low CO levels, which are only 13%-14% ofthe current 8-hour CO standard, at the Northeast 10 th and Stonewall site (AQS Site ill #40-109-0033. See 40 CFRPart 58, App. D, 2(d), 4.2(a). 

### 802:
The current S02 networkis currently adequate, in accordance with 40 CFR Part 58, App. D, 4.4, et seq. In the future, one S02 monitorwill be required in Tulsa to meet the minimum S02 monitoring requirement for the new I-hour S02 NAAQS which will not need to be operational until January 1, 2013.
Pb:
The SavannaPb source oriented monitoring site (AQS Site ill #: 40-121-0416) is improperly listed as being urban spatial scale; we request that you properly address this site as aPb source orientedmonitoring site spatial scale. See 40 CFR Part 58 App. D, 4.5(d).
Please review the final Pb reconsideration monitoring regulations signedbythe Administrator on December 14, 2010, for the new Pb monitoring requirements that shouldbe addressed in your July 1, 2011, annual networkreview plan.Executive Sunnnary

Eacliyear, ambient airmonitoring agencies (all five Region 6 States and the City ofAlbuquerque as a local monitoring organization) take public comment on their arumal ambient airmonitoring networkplans, and after addressing anypublic comments, submit their arumal networkplan to the Region for review and the Regional Administratorfor approval. Their armual networkplans mustbe submitted to.the RegionbyJuly 1st ofeach year. The LouisianaDepartment ofEnvironmental Quality armual networkplanhas been reviewed and is being recommended for Regional Administrator approval withthe technical comments addressed inthe enclosure.