National Emission Standards for Hazardous Air Pollutants for Source Categories; Organic Hazardous Air Pollutants From the Synthetic Organic Chemical Manufacturing Industry

This action promulgates final amendments to the National Emission Standards for Hazardous Air Pollutants for Source Categories; Organic Hazardous Air Pollutants from the Synthetic Organic Chemical Manufacturing Industry (SOCMI) by adding tetrahydrobenzaldehyde (THBA) and crotonaldehyde to, and removing acetaldol from, the list of chemical production processes. The amendment also establishes a separate compliance date of 3 years from final action for subparts F and G of part 63 and 1 year from final action for subpart H of part 63 for the THBA and crotonaldehyde production processes. The EPA is also making a change to clarify compliance demonstration requirements for flexible operation units. This action implements section 112(d) of the Clean Air Act as amended in 1990 (the Act), which requires the Administrator to regulate emissions of hazardous air pollutants (HAP) listed in section 112(b) of the Act. The intended effect of this rule is to protect the public by requiring new and existing major sources to control emissions of HAP to the level reflecting application of the maximum achievable control technology. This action also amends the initial list of source categories of HAP required by section 112(c) of the Act by removing THBA production from the list of categories of major sources.