Approval and Promulgation of Air Quality Implementation Plans; Indiana; Exemption from VOC Requirements for Sources Subject to the National Emission Standards for Hazardous Air Pollutants for Boat Manufacturing or Reinforced Plastics Composites Manufacturing

The EPA is approving a revision to the Indiana Department of Environmental Management's (IDEM) volatile organic compound (VOC) rules for new facilities into the Indiana State Implementation Plan (SIP). This revised rule, submitted by IDEM on July 17, 2006, exempts facilities subject to the boat manufacturing and reinforced plastics composites production national emission standards for hazardous air pollutants (NESHAPS) from the requirement to do a case-by-case State Best Available Control Technology (BACT) analysis under the Indiana SIP, provided that they comply with the applicable NESHAPS. This rule revision is approvable because the only hazardous air pollutant covered by these NESHAPS rules is styrene, a toxic substance which is also classified as a VOC. Therefore, the VOC control requirements in these rules are always applicable. In addition, the provisions in these rules are enforceable and result in a clearly defined level of VOC reductions dependent upon the specific type of operation. These rules were proposed for approval on January 25, 2007, and comments were received supporting EPA's approval.