UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION IX 

Rosemary Morillo 

Chairperson 

Soboba Band of Luiseno Indians 

P.O. Box 487 

San Jacinto, California 92583 

Dear Chairperson Morillo: 

75 Hawthorne Street 

San Francisco, CA 94105-3901 

AUG 1 9 2014 

OFFICE OF THE 

REGIONAL ADMINISTRATOR 

This letter is to notify you ofthe U.S. Environmental Protection Agency's (EPA) preliminary decision to 

designate the So bo ba Band of Luiseno Indians' area of Indian country as nonattaimnent for the 2012 

annual fine pmiicle National Ambient Air Quality Standard (2012 ammal PM2.5 NAAQS) and to inform 

you of our approach for completing the designations. Although your involvement is not required, we 

would like to invite you to pmiicipate in the designatiop.s 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 submit recommendations if you chose to do so. We did not receive a 

recommendation letter or consultation request from you. However, because the EPA is required to 

designate all m·eas of the 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 teclmical information, including 2011-2013 air quality data, the EPA intends 

to designate your area of Indian country as nonattainment along with the surrounding state area. A 

Technical Supp01i Document, which provides additional detail regarding the status of data for your area 

oflndian country and the rationale to support the EPA's nonattainment designation, is enclosed and is 

available on the EPA's website at 

http://www.epa.gov/airquality/particlepollution/designations/20 12standards/tribal.htm. If you 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 if you are interested in consulting 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/triballconsultation/consultpolicy.htm). 

As background, on December 14, 2012, the EPA promulgated a revised primary ammal 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 PM10 (coarse particle) standard at 150 

)lglm3

; and retained the cunent suite of secondary PM standards. The EPA revised the primary annual 

PM2.s standard based on an integrated assessment of an extensive body of new scientific evidence, which 

Printed on Recycled Paper 
substantially strengthens our body of knowledge regarding PMz.s-related health effects. The revised 

primary annual PMz.s standard will provide increased protection for children, older adults, persons with 

pre-existing heart and lung disease, and other at-risk populations against an array ofPMz.s-related 

adverse health effects, including premature mortality, increased hospital admissions and emergency 

department visits, and development and exacerbation of chronic respiratory disease. 

As required by the Clean Air Act, the EPA promulgates designations for all areas across the country. 

The EPA designates an area as "nonattainment" if it is violating the NAAQS or if it is contributing to a 

violation of the NAAQS in a nearby area. Consistent with designations for previous PMz.s standards, the 

EPA intends to use a designation category of "unclassifiable/attainment" for areas that are monitoring 

attainment or do not have monitors, and that the EPA has reason to 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 whether the area is 

meeting the NAAQS, or has 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 data from 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-day public comment period shortly 

in the Federal Register. After considering additional information we receive, the EPA plans to 

promulgate final annual PMz.s designations in December of2014. 

The EPA is committed to working with the states and tribes to share the responsibility of reducing PMz.s 

air pollution. Current and upcoming federal standards and safeguards- including pollution reduction 

rules for power plants, vehicles, and fuels- will assure steady progress to reduce PMz.s-forming 

pollution and will protect public health in communities across the country. We look forward to working 

together with you and your staff to implement the 2012 annual PM2.5 NAAQS. If your Tribe is 

interested in consultation or participating in further discussions or meetings with the EPA officials about 

the designations process, please contact me or have your staff contact Kerry Drake of my staff at 415-

947-4157, or drake.kerry@epa.gov. 

Sincerely, 

Enclosure 

cc: Steven Estrada, Environmental Manager, Soboba Band ofLuiseno Indians