Approval and Promulgation of Implementation Plans; Illinois

The United States Environmental Protection Agency (USEPA) approves, through direct final procedure, Illinois' November 14, 1995 request to incorporate an exemption for acetone from the definitions of Organic Material and Organic Materials, Petroleum Liquid, and Volatile Organic Matter (VOM) or Volatile Organic Compounds (VOC) contained in the Illinois State Implementation Plan (SIP), and thereby from regulation as an ozone precursor. The USEPA also approves Illinois' November 15, 1995 request to revise the definition of VOM or VOC contained in the Illinois SIP to incorporate an exemption for parachlorobenzotrifluoride and cyclic, branched or linear completely- methylated siloxanes from the definition of VOM or VOC and thereby, from regulation as ozone precursors. These requested SIP revisions were made in response to, and consistent with, USEPA's action to add these chemical compounds to the list of chemicals that are exempted from the definition of VOC. In the proposed rules section of this Federal Register, USEPA is proposing approval of and soliciting public comment on these requested SIP revisions. If adverse comments are received on this action, USEPA will withdraw this final rule and address the comments received in response to this action in a final rule on the related proposed rule which is being published in the proposed rules section of this Federal Register. A second public comment period will not be held. Parties interested in commenting on this action should do so at this time.