UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION IX 75 Hawthorne Street San Francisco, CA 94105·3901

Ruben Barrios Chairperson Santa Rosa Rancheria Tachi Yokut Tribe P.O. Box 8 Lemoore, California 93245 Dear Chairperson Barrios: 

## AUG 1 9 2014 OFFICE OF THE REGIONAL ADMINISTRATOR

This letter is to notify you ofthe U
.S
.Enviromnental Protection Agency's (EPA) preliminary decision to designate the SantaRosa Rancheria Tachi Yokut Tribe's area oflndiancountry as nonattainrnent for the 2012 mmual fine particle National Ambient Air Quality Standard (2012 annual PM2.5 NAAQS) and to inform you ofour approach for completingthe designations. Although your involvement is not required, we would like to invite you to participate inthe designations process and to offer you consultation
. In a letter dated May 22, 2014, the EPA encouraged you to participate in the designations process, request consultation, and submitrecommendations ifyou chose to do so. We did not receive a recommendation letter or consultationrequest from you. However, because the EPA is required to designate all areas ofthe country, we intend to promulgate an appropriate designation for your area of Indian country. This is not the final step in the designation process, and you still have time to provide air quality information to the EPA and request consultation. More information regarding this designation is included below
. After considering relevant technical information, including 2011-2013 air quality data, the EPA intends to designate your area ofIndian country as nonattaimnent along with the surrounding state area. A Technical Support Document, which provides additional detail regarding the status ofdata for your area ofIndian country and the rationale to support the EPA's nonattainment designation, is enclosed and is available onthe EPA's website at http:/ /www
.epa.gov/airquality/particlepollution/ designations/2012standards/tribal.htm
. Ifyou have additional information that the EPA should consider, we ask that you submit it to us by October 29, 2014. Please notify us by September 29, 2014 ifyou are interested inconsulting with us regarding the designations process. When requested, consultation will be conducted in accordance with the EPA Policy on Consultation and Coordination with Indian Tribes (www.epa.gov/tribal/consultation/consultpolicy.htm). As background, on December 14,2012, the EPA promulgated a revised primary annual PM2.s NAAQS (78 FR 3086, January 15, 2013). In that action, the EPA revised the primary annual PM2.s standard, strengthening it from 15.0 micrograms per cubic meter (!lg/m3) to 12
.0 !lg/m3 ; retained the existing 24- hour PM2.s standard at 35 !lg/m3; retained the existing 24-hour PMto (coarse particle) standard at 150 !lg/m3; and retained the current suite ofsecondary PM standards
.The EPA revised the primary annual PM2.s standard based on an integrated assessment ofan extensive body ofnew scientific evidence, which

Printed on Recycled Papersubstantially strengthens ourbodyofknowledge regarding PM2.s-related health effects. The revised primary annual PM2.s standard will provide increasedprotection for children, older adults, persons with pre-existing heart and lung disease, and other at-risk populations against an anay ofPM2.s-related adverse health effects, including premature mortality, increased hospital admissions and emergency depmiment visits, and development and exacerbation ofchronic respiratory disease. As required bythe Clean AirAct, the EPApromulgates designations for all areas across the country. The EPA designates an area as "nonattainment" ifit is violating the NAAQS or ifit is contributing to a violation ofthe NAAQS in a nearby area. Consistent with designations for previous PM2.s standards, the EPA intends to use a designation category of"unclassifiable/attainment" for areas that are monitoring attainment ordo nothave monitors, and that the EPAhas reasonto believe are likely attainment and are not contributing to nearby violations. Additionally, the EPA intends to designate as "unclassifiable" those areas where the EPA either cannot determine based on available information whetherthe area is meeting the NAAQS, orhas not determined whether the area contributes to a nearby violation. At this time, the EPA is proceeding with intended initial area designations using quality-assured, certified air quality monitoring datafrom 2011 to 2013. The EPA will make its preliminary designation decisions and supporting documentation available to the general public for review and comment. We will be announcing a 30-daypublic comment period shortly in the FederalRegister. After considering additional information we receive, the EPAplans to promulgate final annual PM2.s designations in December of2014. The EPA is committed to working with the states and tribes to share the responsibility ofreducing PM2.s airpollution. Cunent and upcoming federal standards and safeguards

- including pollutionreduction rules for powerplants, vehicles, and fuels- will assure steady progress to reduce PM2.s-forming pollution and will protectpublic health in communities across the country. We look forward to working together with you and your staffto implementthe 2012 annual PM2.5 NAAQS. Ifyour Tribe is interested in consultation orparticipating in further discussions ormeetings with the EPA officials about the designations process, please contact me or have your staffcontact Keny Drake ofmy staffat 415- 947-4157, or drake.kerry@epa.gov. Sincerely,

Jared Blumenfeld
Enclosure

cc: Allan Berna, Environmental Director, Santa Rosa Rancheria Tachi Yokut Tribe