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

Oklahoma Department ofEnvironmental Quality

Post Office Box 1677

Oklahoma City, OK 73101-1677

Dear Mr. Thompson:

The U.S. Environmental Protection Agency (EPA) Region 6 has completed its

analysis ofthe Oklahoma Department ofEnvironmental Quality (ODEQ) 2010 Annual

Air Monitoring Network Plan to ensure it meets those requirements of 40 CFR Part 58

and its appendices that confer approval authority on the Regional Administrator. We

appreciate your cooperation and work to prepare and submit your 2010 annual network

plan for review. EPA approves your network plan, 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 network plan, along with your schedule for operation.

If you have any questions, please contact me at (214) 665-2100, or your staffmay

contact Ms. Maria Martinez ofmy staff at (214) 665-2230.

Enclosure

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Technical Comments on ODEQ 2010 Annual Air Monitoring Network Plan

Ozone:

Due to the future proposed reconsideration ofthe primary and secondary ozone

National Ambient Air Quality Standards, we recommend that the South Lawton State and

Local Air Monitoring 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 network is satisfactory. Region 6

approves ODEQ's proposal to move the South Lawton 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) and Part 58, App. D, 2(d).

PM:

ODEQ meets the minimum PM2.5 SLAMS sites requirements by maintaining the

Northwest 5th and Sharte1 site (AQS Site J.D. #40-109-0035-collocated) and the

Oklahoma Christian 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 North Peoria site (AQS Site

J.D. #40-143-1127) in Tulsa. However, ODEQ must collocate the highest PM2.5

SLAMS site in Tulsa to satisfy Quality Assurance IQuality Control requirements. See 40

CFR Part 58, App. A, 3.2.5, et seq.

After our review 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 collection needed 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 Christian University 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 Treatment Plant (AQS Site J.D.

#40-101-0167). Based on the current PMlO sites in operation, ODEQ meets the

minimum PM10 SLAMS sites requirements. See 40 CFR Part 58, App. D, 4.6, et seq.

and App. A, 3.3.1 et seq. 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. Any request for a system modification under 40 CFR § 58.14(c) should be

submitted in writing 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-hour CO NAAQS standard). We conclude that

the discontinuance does not compromise the data collection needed 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 10th and Stonewall site (AQS Site ill #40-109-0033. See

40 CFR Part 58, App. D, 2(d), 4.2(a).

802:

The current S02 network is currently adequate, in accordance with 40 CFR

Part 58, App. D, 4.4, et seq. In the future, one S02 monitor will 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 Savanna Pb 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 a Pb source oriented monitoring site spatial scale. See 40 CFR Part 58 App. D,

4.5(d).

Please review the final Pb reconsideration monitoring regulations signed by the

Administrator on December 14, 2010, for the new Pb monitoring requirements that

should be addressed in your July 1, 2011, annual network review plan.
Executive Sunnnary

Eacli year, ambient air monitoring agencies (all five Region 6 States and the City

ofAlbuquerque as a local monitoring organization) take public comment on their arumal

ambient air monitoring network plans, and after addressing any public comments, submit

their arumal network plan to the Region for review and the Regional Administrator for

approval. Their armual network plans must be submitted to.the Region by July 1st of each

year. The Louisiana Department ofEnvironmental Quality armual network plan has been

reviewed and is being recommended for Regional Administrator approval with the

technical comments addressed in the enclosure.