Revisions to the Source-Specific Federal Implementation Plan for Navajo Generating Station, Navajo Nation

The Environmental Protection Agency (EPA) is proposing limited revisions to the source-specific federal implementation plan (FIP) that regulates emissions from the Navajo Generating Station (NGS), a coal- fired power plant located on the reservation lands of the Navajo Nation near Page, Arizona. We are proposing to lower the emission limitation for particulate matter (PM) to conform to the most stringent emission limitation currently applicable to NGS under another EPA regulation, and to replace the opacity limitation and annual PM source testing requirement with a requirement to demonstrate compliance with the lower PM emission limitation using a continuous emission monitoring system for particulate matter.