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## Pacific Southwest, Region 9 Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations You are here: EPA Home Pacific Southwest Air Actions Navajo Nation

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Contact By Electronic Mail to: lee.anita@epa.gov By Postal Mail to the following address:

Anita Lee (AIR-2) US Environmental Protection Agency 75 Hawthorne Street San Francisco, CA 94105

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# Air Actions, Navajo Nation

Actions on this page: Navajo Generating Station Four Corners Power Plant 

### Navajo Generating Station Final Action for Best Available Retrofit Technology for Navajo Generating Station, Navajo Nation July 28, 2014: EPA is taking final action to promulgate regulatory requirements consistent with an alternative to BART developed by the Technical Work Group on NGS (TWG). This action requires NGS, located on the Navajo Nation, to achieve emission reductions of oxides of nitrogen (NOx) in 2019 and 2030. This pollutant contributes to visibility impairment in 11 national parks and wilderness areas surrounding NGS. Federal Register Notice Fact Sheet (PDF) (3 pp, 325K) Press Release Electronic Docket for the Rulemaking 

### Supplemental Proposal for Best Available Retrofit Technology for Navajo Generating Station, Navajo Nation September 25, 2013: EPA is supplementing our February 5, 2013 proposed rulemaking with today’s proposal of an additional Alternative to BART submitted by a group of stakeholders known as the Technical Work Group (TWG). The TWG Alternative to BART requires that Navajo Generating Station (NGS), located on the Navajo Nation, reduce emissions of oxides of nitrogen (NOx) over time. These pollutants contribute to visibility impairment in numerous national parks and wilderness areas surrounding NGS. EPA is accepting comment on our February 5, 2013 proposed rulemaking and today’s Supplemental Proposal concurrently until January 6, 2014. Federal Register Notice Fact Sheet (PDF) (3 pp, 300K) 

### Proposed Federal Implementation Plan - Best Available Retrofit Technology for Navajo Generating Station, Navajo Nation September 16, 2013: EPA is extending the public comment period for three additional months for the proposed rulemaking on NGS. Because EPA has not yet announced the schedule for the five public hearings we intend to hold in Arizona, and because EPA is still evaluating an Alternative to BART we received from stakeholders on July 26, 2013, EPA is extending the comment period to close on January 6, 2014. EPA intends to hold public hearings prior to the close of this extended comment period and to announce the schedule shortly. Federal Register Notice - extended comment period June 26, 2013: EPA is providing a second extension of the public comment period for the proposed rulemaking on NGS based on a request from Salt River Project, the operator of NGS, on behalf of the Navajo Nation, the Gila River Indian Community, the Central Arizona Water Conservation District, the Environmental Defense Fund, and the U.S. Department of the Interior, EPA is extending the comment period an additional 60-days. The public comment period will now close on October 4, 2013. Federal Register Notice June 10, 2013: EPA is announcing our intent to hold five public hearings to accept written and oral comments on EPA’s proposed rulemaking on NGS. We intend to hold a hearing at one location each on the Navajo Reservation and the Hopi Reservation, and in Page, Phoenix, and Tucson, Arizona. We will announce the exact dates, times, and locations for the hearings at a later time. Pacific Southwest Air Home Air Quality Analysis

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http://www.epa.gov/region9/air/navajo/ [8/18/2015 12:12:36 PM] Top of Page

You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Adobe Reader. Federal Register Notice March 19, 2013: EPA is providing a 90-day extension of the public comment period for the proposed rulemaking on NGS, based on requests from the Navajo Nation and other stakeholders. The public comment period will now close on August 5, 2013. Federal Register Notice - extended comment period January 17, 2013 : EPA is proposing that Navajo Generating Station (NGS), located on the Navajo Nation, reduce emissions of oxides of nitrogen (NOx).These pollutants contribute to visibility impairment in numerous national parks and wilderness areas surrounding NGS. Federal Register Notice Fact Sheet (PDF) (3 pp, 198K) Press Release EPA, DOE, DOI - 3 Agency Statement (PDF) (3 pp, 198K) Contact Information Anita Lee (lee.anita@epa.gov) Air Division (415) 972-3958



### Final action on Source-Specific Federal Implementation Plan for Navajo Generating Station February 25, 2010: EPA finalized a Federal Implementation Plan (FIP) under the Clean Air Act (CAA) to regulate emissions from the Navajo Generating Station (NGS), located on the Navajo Indian Reservation in Arizona. The purpose of the FIP is to ensure protection of tribal air resources. The plan previously followed emissions limits established in the Arizona State Implementation Plan. However, EPA's promulgation of the Tribal Authority Rule clarified that State air quality regulations generally could not be extended to facilities located on the reservation. This FIP establishes federally enforceable emissions limitations for sulfur dioxide, total particulate matter, and opacity, and sets a control measures requirement for dust. Navajo Generating Station: Final Rule Navajo Generating Station: Proposed Rule Fact Sheet Response to comments (PDF) (21 pp, 683K) Contact Information Colleen McKaughan (mckaughan.colleen@epa.gov) Air Division (520) 498-0118



### Four Corners Power Plant Four Corners Power Plant Will Implement Alternative to BART December 30, 2013: Arizona Public Service Company notified EPA that it has selected to implement the Alternative to BART for the Four Corners Power Plant. Under this compliance strategy, APS will retire Units 1, 2, and 3 by January 1, 2014 and will comply with the BART emission limit for NOx on Units 4 and 5 by July 31, 2018. December 30, 2013 Letter from APS to EPA (PDF) (2 pp, 187K) 

### Revision to Four Corners Power Plant Federal Implementation Plan – Final Action to Extend Notification Deadline September 24, 2013: EPA has extended the date by which the operator of the Four Corners Power Plant must notify EPA of its selected strategy for compliance with the Best Available Retrofit Technology (BART) Federal Implementation Plan (FIP) that was finalized in August 2012. EPA’s 2012 BART FIP for Four Corners Power Plant required the operator to choose between compliance with EPA’s final BART determination, or with an alternative emission control strategy. EPA is extending the notification date from July 1, 2013 to December 31, 2013. Federal Register Notice Fact Sheet (PDF) (1 pg, 100k)Navajo Nation Air Actions | Pacific Southwest | US EPA

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### Proposed Revision to Four Corners Power Plant Federal Implementation Plan – Proposal to Extend Notification Deadline June 25, 2013: EPA is proposing to extend the date by which the operator of the Four Corners Power Plant must notify EPA of its selected strategy for compliance with the Best Available Retrofit Technology (BART) Federal Implementation Plan (FIP) that was finalized in August 2012. EPA’s 2012 BART FIP for Four Corners Power Plant required the operator to choose between compliance with EPA’s final BART determination, or with an alternative emission control strategy. EPA is proposing to extend the notification date from July 1, 2013 to December 31, 2013. Federal Register Notice Contact Information Anita Lee (lee.anita@epa.gov) Air Division (415) 972-3958



### Federal Implementation Plan - Best Available Retrofit Technology for Four Corners Power Plant, Navajo Nation August 6, 2012: EPA is requiring Four Corners Power Plant (FCPP), located in the Navajo Nation, to reduce emissions of oxides of nitrogen (NOx) and setting emission limits for particulate matter (PM) based on emission rates already achieved at FCPP. These pollutants contribute to visibility impairment in numerous national parks and wilderness areas surrounding FCPP. Federal Register Notice Response to Comments Document (PDF) (171 pp, 851K) Fact Sheet (PDF) (3 pp, 340K) Related Items:

Information on the October 2010 Proposed Rule, the February 2011 Supplemental Proposal, all public comments received, and transcripts from the public hearings are available in the following docket: EPA-R09-OAR-2010-0683 Information from the August 2009 Advanced Notice of Proposed Rulemaking for Four Corners Power Plant and Navajo Generating Station are available in the following docket: EPA-R09-OAR-2009-0598 Contact Information Anita Lee (lee.anita@epa.gov) Air Division (415) 972-3958



### Final action on Source-Specific Federal Implementation Plan for Four Corners Power Plant April 30, 2007: EPA finalized a Federal Implementation Plan (FIP) under the Clean Air Act (CAA) to regulate emissions from the Four Corners Power Plant (FCPP), located on the Navajo Indian Reservation in New Mexico. The purpose of this FIP is to ensure protection of tribal air resources. The plant previously followed emissions limits in the New Mexico State Implementation Plan. However, EPA’s promulgation of the Tribal Authority Rule clarified that State air quality regulations generally could not be extended to facilities located on the reservation. This FIP establishes federally enforceable emissions limitations for sulfur dioxide, nitrogen oxides, total particulate matter, and opacity, and a requirement for control measures for dust. The plan includes significant sulfur dioxide reductions from the facility's historic highs at the 5-unit 2,040 megawatt Four Corners plant, which began operations in 1962. The reductions are the result of a partnership between the Navajo Nation, the Arizona Public Service, the National Park Service, Environmental Defense, Western Resource Advocates, and New Mexico Citizens for Clean Air and Water. Four Corners Power Plant: Final Rule Four Corners Power Plant: Proposed rule Press Release (5/1/07) Fact Sheet Response to comments (PDF) (31 pp, 85K) Contact Information Colleen McKaughan (mckaughan.colleen@epa.gov) Air Division (520) 498-0118Navajo Nation Air Actions | Pacific Southwest | US EPA

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