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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

REGION IX pRO 1c

75 Hawthorne Street

San Francisco, GA 951 05-3901

OFFICE OF THE

REGIONAL ADMINISTRATOR

Gregory Mendoza

Governor

Gila River Indian Community

Post Office Box 97

Sacaton, Arizona 85147

Dear Governor Mendoza:

The purpose of this letter is to provide you with information concerning the U.S. Environmental

Protection Agency’s (EPA) designations process for the 2012 primary annual PM2.5national ambient air

quality standard (NAAQS). Your Tribe may find it important to engage with us in the process of

assigning designations for Indian country. Although your involvement is not required, we would like to

invite you to participate in the designations process and to offer you consultation. We want to ensure

transparent and effective communication in developing area designations for the revised PM2.5NAAQS.

On December 13, 20l2. EPA revised the PM2.5NAAQS to increase protection of public health from tine

particle pollution. The annual PM2.standard was strengthened from 15 ug/m 3to 12 ug/m’. Establishing

initial area designations is a key step in the process of providing the health and/or welfare protection

intended by the Clean Air Act (CAz). Within two years of promulgation of a new or revised NAAQS.

EPA must list and designate all areas in the country as either:

Attainment - areas that meet the standard;

Nonattainment - areas that either do not meet the standard. or are contributing to a nearby area

that does not meet the standard; or

Unclassifiable - areas where there is insufficient information to make a determination as to

attainnient.

These designations are based on current air quality information, recommendations from state governors

and tribal leaders, and other relevant infi)rmation as discussed in the April 2013 designations guidance.

initial Area Designations/or the 2012 Revised Primary Animal Fine Particle National Ambient Air

Qua/ui’ Standard. The guidance is available on the EPA’s PM Designations website at

w\v.4a.uov iesnations,2g _stwkardsthjpriI2Ul 3uidmec.pdL Additional information

ahotit developing tribal air quality designations is available in the September 2013 document,

Developing Designalion Recommendations Jr Areas ofIndian Country, which is available here:

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We are sending you this letter because your Tribe has Treatment in the Same Manner as a State (TAS)

status for designation provisions of the CAA and we received a recommendation of attainment for your

area. We will keep you informed as we finalize designations for your Tribe’s area and invite and

encourage you to participate. Please notify us by June 13, 2014 if you are interested in consulting with

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us regarding a recommended designation. When requested, consultation will be conducted in accordance

with the EPA Policy on Consultation and Coordination wit/i indian Tribes

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We plan to fonTlally announce our intended designations for all areas by August 14, 2014. At that time

we will send another letter to you with our intended designation and offer an additional opportunity to

consult with us on any modifications EPA proposes make to your Tribe’s recommendation.

In accordance with section 107(d)(1)(B) ofthe CAA, we are required to issue final designations for the

PM2.5NAAQS no later than December 12, 2014. Our designations will be based on the most recent

three calendar years of certified, quality-assured monitoring data available, and any other relevant

information.

As the designation process moves forward, we will keep you informed of any additional guidance or

other support activities. We look forxvard to working with you to develop area designations under the

PM2.5NAAQS in a timely manner. If your Tribe is interested in consultation or has questions about the

designations process, please do not hesitate to contact me or Kerry Drake, Associate Director, Air

Division, of my staff, at 415-947-4157

Sincerel ,

lurifeld

Enclosure

cc: Ondrea Barber, Executive Director DEQ
2012 PM2•5NAAQS Tribal Designations Schedule

Action Date

Recommendations for the PM25 NAAQS due December 13, 2013

to EPA (original deadline).

Advance consultation opportunity offered to Late May 2014 (upon receipt of letter)

tribal leaders.

Deadline to request advance tribal consultation. June 13, 2014

Optional tribal recommendations for the PM2.5 June 13, 2014

NAAQS due to EPA (extended deadline).

Advance tribal consultation takes place. June -July, 2014

EPA announces intended designations, August 14, 2014

additional consultation opportunity offered to

tribal leaders.

Additional consultation takes place. September -October, 2014

EPA issues final PM75 designations. December 12, 2014