sr UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION IX

.‘ c’ Pno 75 Hawthorne Street San Francisco, CA 95105-3901 

## MAY 22 2014 REGIONAL ADMINISTRATOR

Diane Enos President Salt RiverPima Maricopa Indian Community 10005 E. Osbourne Road Scottsdale, Arizona 85256 Dear President Enos: The purpose ofthis letter is to provide you with information concerning the U.S. Environmental Protection Agency’s (EPA) designations process forthe 2012 primary annual PM 2

. 5 national ambient air ciuality standard (NAAQS). YourTribe may find it importantto engage with us in the process of assigning designations for Indian country. Although your involvement is notrequired, 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 forthe revised PM 2

. 5 NAAQS. On December 13, 2012, EPArevised the PM 25 NAAQS to increase protection ofpublic health from tine particle pollution. The annual PM 25 standard was strengthened from 15 ug/m 3 to 12 ug/rn. 

### Establishing initial area designations is a key step in the process ofproviding the health andlorwelfare protection intendedby the Clean AirAct (CAA). Within two 

### years ofpromulgation ofanew orrevised NAAQS. EPA must list and designate all areas in the country as either: Attainment

- areas thatmeet the standard; Nonattainment

- areas that either do not meetthe standard, or are contributingto a nearby area that does notmeetthe standard; or 

### Unclassifiable

- areas where there is insufficient informationto make a determination as to attainment. These designations are based on current air quality information, recommendations from state governors and tribal leaders. and otherrelevant information as discussed in the April 2013 designations guidance. 

### InitialAreaDesignationsJöi’ the 2012 RevisedPriman’ AnnualFine ParticleNationalAmbientAir Qualm’ Standard. The guidance is available on the EPA’s PM Designations website at p°’p n’ u1 Und iid’/doLs’ ipii1201 w idm

. pd

### I Additional intormation about developing tribal air quality designations is available in the September2013 document, 

### L)evelopingDesignation RecommendationsörAreas 

### qfIndian Country, which is available here: NUL/v\\_v We are sending you this letterbecause yourTribehas Treatment in the Same Manner as a State (TAS) status for designation provisions ofthe CAA andwe received arecommendation ofattainment foryour 

### area. We will keep you informed as we 

### finalize designations foryourTribe’s area and invite 

### and encourage you to participate. Pleasenotifyus byJune 13, 2014 ifyou are interested in consulting with Printed on Rrvc1(’d Paperus regarding a recommended designation. When requested, consultation will he conducted in accordance with the EPA Policy on Consultation and Coordination with Indian Tribes (www.epa.eov/tribal/eonsultation/consult—poliçyhtm). We plan to formally 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) of the CAA, we are required to issue final designations for the PM2 5 IAAQS 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 forward to working with you to develop area designations under the PM 2 . 5 NAAQS 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 or drake.kerrvaepa.ov. Sincerely, Enclosure cc: Christopher Horan, EPNR Manager

### 2012 PM 2 • 5 

### NAAQS Tribal Designations Schedule
Action Date Recommendations forthe PM 25 NAAQS due December 13, 2013 to EPA (original deadline). Advance consultation opportunity offeredto LateMay 2014 (uponreceipt ofletter) tribal leaders. Deadlinetorequest advancetribal consultation. June 13, 2014 Optional tribal recommendations forthe PM 2

. 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 offeredto tribal leaders. Additional consultationtakes place. September

- 

### October, 2014 EPA issues final PM 75 designations. December 12, 2014