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Pacific Southwest, Region 9
Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations
Air Actions, Navajo Nation
Recent Additions
» March 19, 2013: EPA is providing a 90-day extension of the public comment period for the proposed rulemaking on NGS.
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Navajo Generating Station
Proposed Federal Implementation Plan - Best Available Retrofit Technology for Navajo Generating Station, Navajo Nation
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.
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)
- More about NGS
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
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
- 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
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) 498-0118
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