On October 14, 1999, the U. S. Environmental Protection Agency (EPA) proposed national emission standards for hazardous air pollutants (NESHAP) for the acetal resins production, acrylic and modacrylic fiber production, hydrogen fluoride production, and polycarbonate production source categories (63 FR 55178) under authority of Section 112 of the Clean Air Act (Act). Twenty-one public comment letters were submitted to the generic MACT docket, inclusive of the items submitted to the separate dockets established for each of the source categories proposed to be regulated. Some of the comment letters received are duplicates. At proposal, the EPA requested that commenters submit source category-specific comments to dockets established for each of the generic MACT source categories for which requirements were proposed and general nonsource category specific comments to the generic MACT docket. This request meant that some comment letters were submitted to both the nonsource category-specific generic MACT docket and one or more of the generic MACT source category-specific dockets. The comments that were submitted and the responses to these comments are summarized in this document. This summary is the basis for the revisions made to the standards between proposal and promulgation.

EPA project officer: David Markwordt. "May 1999." "EPA-453/C-99-001."