Air Plan Approval; Indiana; Commissioner's Order for Carmeuse Lime, Inc.

The Environmental Protection Agency (EPA) is approving, as a revision to the Indiana State Implementation Plan (SIP), a submittal from the Indiana Department of Environmental Management (IDEM) to EPA, dated December 22, 2016. The submittal consists of an order issued by the Commissioner of IDEM that establishes permanent and enforceable sulfur dioxide (SO2) emission limits for Carmeuse Lime, Inc. (Carmeuse), applicable to its Gary, Indiana lime manufacturing plant. IDEM submitted this order so the area near Carmeuse can be designated ``attainment'' of the 2010 primary SO2 National Ambient Air Quality Standards (NAAQS), a matter that will be addressed in a separate future rulemaking. EPA's approval of this order would make these SO2 emission limits and applicable reporting, recordkeeping, and compliance demonstration requirements part of the federally enforceable Indiana SIP.