Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; State of Michigan

On July 21, 1994 the USEPA published a proposal to approve the 1990 base year emission inventory, basic vehicle inspection and maintenance (I/M) and the redesignation to attainment and associated section 175A maintenance plan for the ozone National Ambient Air Quality Standard (NAAQS) for the seven-county Detroit-Ann Arbor, Michigan area as a State Implementation Plan (SIP) revisions. The 30- day comment period concluded on August 22, 1994. A total of 72 comment letters were received in response to the July 21, 1994 proposal, 62 favorable, 9 adverse and 1 request to extend the comment period. On September 8, 1994, however, the USEPA published a correction document and 15-day extension of the comment period as a result of the inadvertent omission of a number of lines from the July 21, 1994 proposal. The reopened comment period concluded on September 23, 1994. An additional 25 comment letters were received in response to the September 8, 1994, extension of public comment period regarding the July 21, 1994 proposal approval, 2 favorable, 22 adverse and 1 informational. This final rule summarizes all comments and USEPA's responses, and finalizes the approval of the 1990 base year emission inventory, and basic I/M, and the redesignation to attainment for ozone and associated section 175A maintenance plan for the Detroit-Ann Arbor area.