Supplemental Proposed Rule of Source Specific Federal Implementation Plan for Implementing Best Available Retrofit Technology for Four Corners Power Plant: Navajo Nation

On October 19, 2010, the Environmental Protection Agency (EPA) published a proposal to promulgate a source specific Federal Implementation Plan (FIP) requiring the Four Corners Power Plant (FCPP), located on the Navajo Nation, to achieve emissions reductions required by the Clean Air Act's Best Available Retrofit Technology (BART) provision. On November 24, 2010, Arizona Public Service (APS) acting on behalf of FCPP's owners submitted a letter to EPA offering an alternative proposal to reduce visibility-impairing pollution. In this action, EPA is supplementing our October 19, 2010 BART proposal with our technical evaluation of APS' alternative proposal. We are proposing to find that a different alternative emissions control strategy would achieve more progress than EPA's BART proposal towards achieving visibility improvements in the surrounding Class I areas.

Agency Contact: Anita Lee, EPA Region IX, (415) 972- 3958, r9air_fcppbart@epa.gov.