Approval and Promulgation of Air Quality Implementation Plans; State of Colorado; Denver 1-Hour Ozone Redesignation to Attainment, Designation of Areas for Air Quality Planning Purposes, and Approval of Related Revisions

On May 11, 2001, EPA published a notice of proposed rulemaking (NPR) that used EPA's parallel processing procedure to propose approval of the State of Colorado's request to redesignate the Denver-Boulder metropolitan (Denver) "transitional" ozone nonattainment area to attainment for the 1-hour ozone National Ambient Air Quality Standard (NAAQS). In that NPR, EPA proposed to approve the maintenance plan for the Denver area and the additional State Implementation Plan (SIP) elements involving revisions to Colorado's Regulation No. 3 "Air Contaminant Emissions Notices" and Colorado's Regulation No. 7 "Emissions of Volatile Organic Compounds" that were previously submitted by Governor Roy Romer, for our approval, on August 8, 1996. In this action, EPA is approving the Denver 1-hour ozone redesignation request, the maintenance plan, the revisions to Regulation No. 3 and Regulation No. 7, and the Volatile Organic Compounds (VOC) and Nitrogen Oxides (NO<INF>X</INF>) transportation conformity budgets.