Approval and Promulgation of State Implementation Plans; State of Montana

요약

In this action, EPA is approving revisions to the Montana State Implementation Plan (SIP) submitted on April 25, 1988, by the Governor of Montana. EPA proposed to approve these revisions in the October 20, 1989, Federal Register. EPA is taking final action to approve those portions of the SIP submittal which include: The adoption of the national ambient air quality standards (NAAQS) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM-10); deletion of the total suspended particulate (TSP) ambient air quality standard; amendments to the prevention of significant deterioration of air quality (PSD) program to include protection of the PM-10 NAAQS and assure consistency with EPA requirements; commitments to monitor and develop plans if PM-10 violations are found in Group II PM-10 areas; a revised emergency episode plan for PM-10; and a listing of the control measures in the SIP which will be relied on to maintain the PM-10 NAAQS, including the Montana Smoke Management Plan. The effect of approval is to make the plans federally enforceable. At this time, EPA is taking no action on the remainder of the submittal.