Approval and Promulgation of Air Quality Implementation Plans; Michigan; Revised Format of 40 CFR Part 52 for Materials Being Incorporated by Reference

EPA is revising the format of materials submitted by the state of Michigan that are incorporated by reference (IBR) into its State Implementation Plan (SIP). The regulations affected by this format change have all been previously submitted by Michigan and approved by EPA. This format revision will primarily affect the "Identification of plan" section, as well as the format of the SIP materials that will be available for public inspection at the National Archives and Records Administration (NARA), the Air and Radiation Docket and Information Center located at EPA Headquarters in Washington, DC, and the EPA Region 5 Office. EPA is also adding a table in the "Identification of plan" section which summarizes the approval actions that EPA has taken on the non-regulatory and quasi-regulatory portions of the Michigan SIP. The sections pertaining to provisions promulgated by EPA or state- submitted materials not subject to IBR review remain unchanged.