UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://wvvw.epa.gov/region08 

". 

Ref: 8P-AR 

The Honorable A. T. "Rusty" Stafne, Chairman 

Assiniboine & Sioux Tribes 

POBox 1027 

Poplar,MT 59255-1027 

Dear Chairman Stafne: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribes may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

.standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribes 

are interested in consultation or participating in further discussions or meetings with EPA 

officials about the designations process, please do not hesitate to contact me or your staff may 

contact Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Marti 

Regional Admin 

Enclosure 

Cc: Deb Madison, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Willie A. Sharp, Chairman 

Blackfeet Tribe 

POBox 850 

Browning, MT 59417-2029 

Dear Chairman Sharp: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (SOl) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised SOl standard. 

On June 3, 2010, EPA added a new primary NAAQS for SOl in order to provide 

increased protection of public health from SOl pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(1)(A) ofthe CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3,2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant infonnation that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional Administrator 

Enclosure 

Cc: Gerald Wagner, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Kevin C. Keckler, Chairman 

Cheyenne River Sioux Tribe 

POBox 590 

Eagle Butte, SD 57625-0590 

Dear Chairman Keckler: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (SOz) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised SOz standard. 

On June 3, 20 I0, EPA added a new primary NAAQS for SOz in order to provide 

increased protection of public health from SOz pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb SOz standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your statT informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

J~~ Regional Administrator 

Enclosure 

Cc: David D. Nelson, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Raymond Parker, Chairman 

Chippewa-Cree Tribe 

POBox 544 Rocky Boy Route 

Box Elder, MT 59521-0544 

Dear Chairman Parker: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of 1-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, 1-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation ofa new or 

revised NAAQS, section 107(d)(1)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. . 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin· ...nv,"--­

Regional Adminis rator 

Enclosure 

Cc: Jonathan Jay Eagleman, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

t/ F 1""\ f"... 

hilt•., L, ';,: ! . 

Ref: 8P-AR 

The Honorable E.T. "Bud" Moran, Chairman 

Confederated Salish & Kootenai Tribes 

POBox 278 

Polson, MT 59860-0278 

Dear Chairman Moran: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (SOz) National Ambient Air Quality Standard (NAAQS). Your Tribes may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised SOz standard. 

On June 3, 2010, EPA added a new primary NAAQS for SOz in order to provide 

increased protection of public health from SOz pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb SOz standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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
 

Unclassitiable-areas where there is insufficient information to make a determination.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribes 

are interested in consultation or participating in further discussions or meetings with EPA 

officials about the designations process, please do not hesitate to contact me or your staff may 

contact Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional Administrator 

Enclosure 

Cc: Mike Durglo, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Duane Big Eagle, Chairman 

Crow Creek Sioux Tribe 

P a Box 50 

Fort Thompson, SO 57339-0380 

Dear Chairman Big Eagle: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3. 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb). is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(1 )(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian country, as either: 

Attainment-areas that meet the standard;
 

Nonattalnment-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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3,2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Marti 

Regional 

~~Adminis rator 

Enclosure 

Cc: Marie Charger, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

l;' ,. 1"", n 

LLi ':.~ \. ",..; .;;. i , 

Ref: 8P-AR 

The Honorable Cedric Black Eagle, Chainnan 

Crow Tribe 

POBox 400 

Crow Agency, MT 59022-0400 

Dear Chairman Black Eagle: 

The purpose of this letter is to provide you with infonnation and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section I07(d)(l)(A) ofthe CAA requires EPA to list and designate all areas in 

the country, including Indian 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 infonnation to make a detennination.
 

These designations are based on current air quality infonnation, recommendations from 

State Governors and Tribal Leaders. and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

J~~ Regional Administrator 

Enclosure 

Cc: Myron 1. Shield Jr., Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

f;,:" -", t;.. ,!),~

L..., .. ':.. ;..... ;= (_ ..~,,; < 

Ref: 8P-AR 

The Honorable Mike Lajeunesse, Chairman 

Eastern Shoshone Tribe 

POBox 538 

Fort Washakie. WY 82514-0217 

Dear Chairman Lajeunesse: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (SOz) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised SOz standard. 

On June 3. 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l )(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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
 

Unclassitiable-areas where there is insufficient information to make a determination.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James .LJ1~ B. Martin· 

Regional Administ tor 

Enclosure 

Cc: Don Aragon, Environmental Director 
i '; 

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Anthony Reider, President 

Flandreau Santee Sioux Tribe 

POBox 283 

Flandreau, SO 57028-0283 

Dear President Reider: 

The purpose of this letter is to provide you with infonnation and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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 infonnation to make a detennination.
 

These designations are based on current air quality infonnation, recommendations from 

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James 

~~~ B. Martin 

Regional Admini 

Enclosure 

Cc: Mark Allen, GAP Coordinator 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

r'\ " .. J . ~.' .t~~ ."\'" i..w.l ,t' , , I{<; '.. 

Ref: 8P-AR 

The Honorable Tracy King, President 

Gros Ventre and Assiniboine Tribes 

RR I Box 66 

Harlem, MT 59526-9455 

Dear President King: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribes may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section I07(d)(1)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribes 

are interested in consultation or participating in further discussions or meetings with EPA 

officials about the designations process, please do not hesitate to contact me or your staff may 

contact Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James ~~B. Martin 

Regional Adminis ator 

Enclosure 

Cc: Ina Nez Perce, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://'NWW.epa.gov/region08 

Ref: 8P-AR 

The Honorable Michael B. Jandreau, Chairman 

Lower Brule Sioux Tribe 

187 Oyate Circle 

Lower Brule, SO 57548 

Dear Chairman Jandreau: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may tind it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l )(A) ofthe CAA requires EPA to list and designate all areas in 

the country, including Indian 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
 

Unclassitiable-areas where there is insufficient information to make a determination.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional Adminis 

Enclosure 

Cc: George Honeywell, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www,epa,gov/region08 

1 UI~' r-~ lVtHt\ ,; ''': ,_ .." i 

Ref: 8P-AR 

The Honorable Kim Harjo, Chairperson 

Northern Arapaho Tribe 

POBox 396 

Fort Washakie, WY 82514-0217 

Dear Chairperson Harjo: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised SOz standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section I07(d)(1)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin ~­ Regional AdminisVrat~r

Enclosure 

Cc: Don Aragon, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

!,...e Jl. 0­

~'J~t-~. \ t;;;l '''; t._. .. i 

Ref: 8P-AR 

The Honorable Leroy Spang, President 

Northern Cheyenne Tribe 

PO Box 128 

Lame Deer, MT 59043-0128 

Dear President Spang: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James 

M~B. Martin + 

Regional Administrator 

Enclosure 

Cc: Charlene Alden, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Jl : 1""..... 0' ." 

t.... J'-,~~:lo ~,,;1 '~ r.....,. •..., ~,

Ref: 8P-AR 

The Honorable Gwen T. Davis, Chairwoman 

Northwestern Band of the Shoshoni Nation 

353 E. Lander St. 

Pocatello, ID 83205 

Dear Chairwoman Davis: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (SOz) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised SOz standard. 

On June 3, 20 I0, EPA added a new primary NAAQS for SOz in order to provide 

increased protection of public health from SOl pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb SOz standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation ofa new or 

revised NAAQS, section I07(d)(I)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional Admini 

Enclosure 

Cc: Jason Walker, GAP Coordinator 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

r " f;, 0;-. (,... ~, 'I 

r , t ... t ~. ':. " •.1 .,: "~-'

Ref: 8P-AR 

The Honorable John Yellowbird Steele, President 

Oglala Sioux Tribe 

POBox 2070 

Pine Ridge, SO 57770-2070 

Dear President Yellowbird Steele: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(1)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional Adminis 

Enclosure 

Cc: Robert Pille, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

~!.l":'. r· . ~\;~ii ... '" .. a ... ~'-"" • .Ii 

Ref: 8P-AR 

The Honorable Jeanine Borchardt, Chairwoman 

Paiute Indian Tribe of Utah 

440 North Paiute Dr 

Cedar City, UT 84720-6181 

Dear Chairwoman Borchardt: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(1 )(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3,2011. 

We are required to issue tinal designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the tinal designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303)312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Marti 

Regional Adminis 

Enclosure 

Cc: Gaylord Robb, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://'NWW.epa.gov/region08 

Ref: 8P-AR 

The Honorable Rodney Bordeaux, President 

Rosebud Sioux Tribe 

POBox 430 

Rosebud, SO 57570-0658 

Dear President Bordeaux: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to otfer you consultation: 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(1 )(A) ofthe CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin_ 

Regional AdminGft'ator 

Enclosure 

Cc: Kevin Kvame, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

'\~ A!"'>, ,... (' . " 

lVi;:"u < t:"·~ ~;.; j 

Ref: 8P-AR 

The Honorable Robert Shepherd, Chainnan 

Sisseton-Wahpeton Oyate 

POBox 509 

Agency Village, SD 57262-0509 

Dear Chainnan Shepherd: 

The purpose ofthis letter is to provide you with infonnation and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(I)(A) ofthe CAA requires EPA to list and designate all areas in 

the country, including Indian 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 infonnation to make a determination.
 

These designations are based on current air quality infonnation, recommendations from 

State Governors and Tribal Leaders, and other relevant infonnation discussed in the enclosed 

guidance document We request and encourage your recommendation for designation of your 

area for consideration in this process, 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Ma~~~ Regional Administrator 

Enclosure 

Cc: Myrna Thompson, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

" . ~,"".... ~.-# .. i 

Ref: 8P-AR 

The Honorable Lori Bear, Chairwoman 

Skull Valley Band of Goshute Indians 

P.O Box 448 

Grantsville, UT 84029 

Dear Chairwoman Bear: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for SOl in order to provide 

increased protection of public health from SOl pollution. The new standard 01'75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of l-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, l-hour 75 ppb SOl standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(1 )(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue tinal designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin -"""'~'-_

Regional Admini 

Enclosure 

Cc: Nicole Howell, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Jim Newton, Acting Chairman 

Southern Ute Indian Tribe 

POBox 737 

Ignacio, CO 81137-0737 

Dear Acting Chairman Newton: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may tind it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of 1-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, 1-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(1)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3,2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. FoJlowing the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new SOz NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new SOz standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin c--r,-'_ 

Regional Administ 

Enclosure 

Cc: Thomas (Tom) Johnson, Division Head 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Myra Pearson, Chairwoman 

Spirit Lake Nation 

POBox 359 

Fort Totten, ND 58335-0359 

Dear Chairwoman Pearson: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised SOz standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James 

~~.r B. Martin 

Regional Administ or 

Enclosure 

Cc: Silas Ironheart, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

("\ / 

Ref: 8P-AR 

The Honorable Charles W. Murphy, Chairman 

Standing Rock Sioux Tribe 

P a Box 0 

Fort Yates, ND 58538-5516 

Dear Chairman Murphy: 

The purpose of this letter is to provide you with infonnation and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of 1-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb SOz standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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
 

Unclassitiable-areas where there is insufficient infonnation to make a detennination.
 

These designations are based on current air quality infonnation, recommendations from 

State Governors and Tribal Leaders, and other relevant infonnation discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials. 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional Administ ator 

Enclosure 

Cc: .Troy Davis, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Tex Hall, Chainnan 

Three Affiliated Tribes 

404 Frontage Road 

New Town, ND58763-9404 

Dear Chainnan Hall: 

The purpose of this letter is to provide you with infonnation and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (SOz) National Ambient Air Quality Standard (NAAQS). Your Tribes may find it 

important to engage in the process ofassigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised SOz standard. 

On June 3, 2010, EPA added a new primary NAAQS for SOz in order to provide 

increased protection of public health from SOz pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb SOz standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section I07(d)(l )(A) ofthe CAA requires EPA to list and designate all areas in 

the country, including Indian 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 infonnation to make a detennination.
 

These designations are based on current air quality infonnation, recommendations from 

State Governors and Tribal Leaders, and other relevant infonnation discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribes 

are interested in consultation or participating in further discussions or meetings with EPA 

officials about the designations process, please do not hesitate to contact me or your staff may 

contact Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional Administr 

Enclosure 

Cc: Joe Gillies Jr., Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www_epa_govIregion08 

r f- ,< ~-., 0,.' . '; 

tt~ . .d \, L>' L·..J r 

Ref: 8P-AR 

The Honorable Merle St. Claire, Chairman 

Turtle Mountain Band of Chippewa 

POBox 900 

Belcourt, ND 58316-0730 

Dear Chairman St. Claire: 

The purpose ofthis letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from SOz pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb SOz standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(1)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions' or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional 

~~Administ tor 

Enclosure 

Cc: Rhonda Azure, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

p,~~ ,." /. . ',i~ (~~.i'~ (.,.; ._ i..... <'#" ;. j 

Ref: 8P-AR 

The Honorable Richard Jenks, Chainnan 

Ute Indian Tribe 

POBox 190 

Fort Duchesne, UT 84026-0460 

Dear Chainnan Jenks: 

The purpose of this letter is to provide you with infonnation and guidance on the 

u.s. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile on-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(I)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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 infonnation to make a detennination.
 

These designations are based on current air quality infonnation, recommendations from 

State Governors and Tribal Leaders, and other relevant infonnation discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional Adminis rator 

Enclosure 

Cc:	 Mike Natchees, Environmental Coordinator 

Manuel Myore, Energy, Minerals, & Air Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Frances Poowegup, Vice-Chairwoman 

Ute Indian Tribe 

POBox 190 

Fort Duchesne. UT 84026-0460 

Dear Vice-Chairwoman Poowegup: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010. EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new. I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(I)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin' 

Regional Administr tor 

Enclosure 

Cc:	 Mike Natchees, Environmental Coordinator 

Manuel Myore, Energy, Minerals, & Air Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

r- t ;•.."', (' 

~. •• i. I '_l .... ..,_ ••" 

Ref: 8P-AR 

The Honorable Phillip Chimburas, Councilman 

Ute Indian Tribe 

POBox 190 

Fort Duchesne, UT 84026-0460 

Dear Councilman Chimburas: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of 1-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, 1-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(1)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional Admims ator 

Enclosure 

Cc:	 Mike Natchees, Environmenta1 Coordinator 

Manuel Myore, Energy, Minerals, & Air Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Stewart Pike, Councilman 

Ute Indian Tribe 

POBox 190 

Fort Duchesne, UT 84026-0460 

Dear Councilman Pike: 

The purpose ofthis letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin 

Regional Administ ator 

Enclosure 

Cc:	 Mike Natchees, Environmental Coordinator 

Manuel Myore, Energy, Minerals, & Air Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

Ref: 8P-AR 

The Honorable Irene Cuch, Councilwoman 

Ute Indian Tribe 

POBox 190 

Fort Duchesne, UT 84026-0460 

Dear Councilwoman Cuch: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(I)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the tinal designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. MartinRegional Adminis 

Enclosure 

Cc:	 Mike Natchees, Environmental Coordinator 

Manuel Myore, Energy, Minerals, & Air Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

~I " iii ~J e) ,« ('0' -.. " fr. 

r'L '.;". ~;.:1 .:..~ L",;.; i 

Ref: 8P-AR 

The Honorable Ronald Wopsock, Councilman 

Ute Indian Tribe 

POBox 190 

Fort Duchesne, UT 84026-0460 

Dear Councilman Wopsock: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 20 I0, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average ofthe 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(l)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin'--r\'~'--'-­

Regional Admini 

Enclosure 

Cc:	 Mike Natchees, Environmental Coordinator 

Manuel Myore, Energy, Minerals, & Air Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

" , -~. ..... """".- i • 

Ref: 8P-AR 

The Honorable Gary Hayes, Chainnan 

Ute Mountain Ute Tribe 

P a Box 11 

Towaoc, CO 81334-0448 

Dear Chainnan Hayes: 

The purpose of this letter is to provide you with infonnation and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (S02) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised S02 standard. 

On June 3, 2010, EPA added a new primary NAAQS for S02 in order to provide 

increased protection of public health from S02 pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb S02 standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation of a new or 

revised NAAQS, section 107(d)(I)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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
 

Unclassitiable-areas where there is insufficient infonnation to make a determination.
 

These designations are based on current air quality infonnation, recommendations from 

State Governors and Tribal Leaders, and other relevant infonnation discussed in the enclosed 

guidance document. We request and encourage your recommendation for designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notifY us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin iiL.­

Regional Admi~iJ(rat~r

Enclosure 

Cc: Scott Clow, Environmental Director 
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION 8 

1595 Wynkoop Street 

DENVER, CO 80202-1129 

Phone 800-227-8917 

http://www.epa.gov/region08 

~!''';~, r': 

t',,~"d'~ ,,~ ~i L..'~"

Ref: 8P-AR 

The Honorable Robert Cournoyer, Chairman 

Yankton Sioux Tribe 

POBox 248 

Marty, SO 57361-0248 

Dear Chairman Cournoyer: 

The purpose of this letter is to provide you with information and guidance on the 

U.S. Environmental Protection Agency's (EPA) designations process for the revised sulfur 

dioxide (SOz) National Ambient Air Quality Standard (NAAQS). Your Tribe may find it 

important to engage in the process of assigning designations for Indian country. Therefore, we 

would like to invite you to participate in the designations process and to offer you consultation. 

We want to ensure early, transparent and effective communication in proposing area 

designations for the revised SOz standard. 

On June 3, 20 I0, EPA added a new primary NAAQS for SOz in order to provide 

increased protection of public health from SOz pollution. The new standard of 75 parts per 

billion (ppb), is attained when the 3-year average of the 99th percentile of I-hour daily maximum 

concentrations does not exceed 75 ppb. No changes were made to the existing 3-hour secondary 

standard. In this action EPA is only designating for the new, I-hour 75 ppb SOz standard. 

Establishing area designations is a key step in the process of providing the health 

protection intended by the Clean Air Act (CAA). Within two years of promulgation ofa new or 

revised NAAQS, section 107(d)(I)(A) of the CAA requires EPA to list and designate all areas in 

the country, including Indian 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~areaswhere there is insufficient information to make a determination.
 

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

State Governors and Tribal Leaders, and other relevant information discussed in the enclosed 

guidance document. We request and encourage your recommendation fOf designation of your 

area for consideration in this process. 
While tribes are not obligated to participate in the designations process, we invite and 

encourage you to do so. Please notify us if you are interested participating in the designations 

process and/or receiving consultation regarding the process. If you choose to participate, we ask 

that you provide your designations recommendation to EPA by June 3, 2011. 

We are required to issue final designations by no later than June 3, 2012. We plan to 

announce our intended designations as early as possible after receipt of recommendations, but no 

later than 120 days prior to promulgating the final designations. Following the announcement of 

intended designations, tribes will have an additional opportunity to consult on any modifications 

EPA may propose to a tribe's original recommendation. 

The enclosed memorandum provides guidance on the process for designating areas under 

the new S02 NAAQS. Our designations will be based on the most recent three calendar years of 

certified, quality-assured monitoring data available, and any other relevant information that is 

provided, including refined air quality dispersion modeling. 

As the process moves forward, we will keep you and your staff informed of any 

additional guidance or other support activities. We look forward to working with you and your 

staff to develop area designations under the new S02 standard in a timely manner. If your Tribe 

is interested in consultation or participating in further discussions or meetings with EPA officials 

about the designations process, please do not hesitate to contact me or your staff may contact 

Alfreda Mitre, at (303) 312-6343 or Monica Morales, at (303) 312-6936. 

Sincerely, 

James B. Martin , 

Regional AdministrltorEnclosure 

Cc: Richard Leasure, GAP Coordinator