Air Plan Approval; Illinois; Volatile Organic Compounds Definition

The Environmental Protection Agency (EPA) is approving a state submission as a revision to the Illinois state implementation plan (SIP). The revision, submitted on May 30, 2017, incorporates changes to the Illinois Administrative Code (IAC) definition of ``volatile organic material'' or ``volatile organic compounds'' (VOC). The revision removes recordkeeping and emission reporting requirements related to the use of tertiary butyl acetate (also known as t-butyl acetate) as a VOC. The revision is consistent with an EPA 2016 rulemaking related to tertiary butyl acetate. In addition, Illinois' submission includes the addition of chemical identification information to the list of compounds excluded from the definition of VOC and the deletion of an unnecessary phrase in the definition of VOC. EPA proposed this action on November 2, 2017, and received one public comment in response.