Approval and Promulgation of Air Quality Implementation Plans; States of Montana and Wyoming; Revisions to the Administrative Rules of Montana; New Source Performance Standards for Wyoming and Montana

EPA is taking direct final action approving State Implementation Plan (SIP) revisions submitted by the Governor of Montana on October 28, 2002. The October 28, 2002 submittal revises the Administrative Rules of Montana (ARM) by updating the Incorporation by Reference rules, deleting the definition for volatile organic compounds (VOCs), and making other minor corrections to the rules. The October 28, 2002 submittal also makes revisions to the Yellowstone County Air Pollution Control Program (YCAPCP). EPA is only approving the revisions to the section of the YCAPCP that have been approved into the SIP. The intended effect of this action is to make these revisions federally enforceable. We are also announcing that on June 24, 2003, we updated the delegation of authority for the implementation and enforcement of the New Source Performance Standards (NSPS) to the State of Montana. On August 9, 2000, August 2, 2001 and June 30, 2003, the State of Wyoming submitted revisions to the NSPS in the Wyoming Air Quality Standards and Regulations and requested delegation of the NSPS. We are announcing that on August 13, 2003, we delegated the authority for the implementation and enforcement of the NSPS to the State of Wyoming. In addition, we are updating the "Delegation Status of New Source Performance Standards [(NSPS) for Region VIII]" table to add entries for newly delegated NSPS subparts for the State of Montana and the State of Wyoming. These actions are being taken under sections 110 and 111 of the Clean Air Act (CAA).