Approval and Promulgation of State Implementation Plan, Oklahoma; Supplemental Notice of Proposed Rulemaking

In this supplemental notice of proposed rulemaking, the Environmental Protection Agency (EPA) is supplementing our proposed approval published on March 22, 2018, of revisions to the State Implementation Plan (SIP) for Oklahoma, as submitted by the State of Oklahoma designee with a letter dated February 14, 2017. First, we are reopening the comment period based on information submitted by Oklahoma in a letter dated July 31, 2018, and our analysis of it. Second, EPA is withdrawing its proposed action on the Commercial and Industrial Solid Waste Incineration Units rule because the State did not submit it for approval as a SIP revision.