OMB Approves EPA’s Final Rule for SOCMI NESHAP Update

Yesterday, the OMB’s Office of Information and Regulatory Affairs (OIRA) announced that it had approved a final rule from the Environmental Protection Agency for “NSPS for the Synthetic Organic Chemical Manufacturing Industry and NESHAP for the Synthetic Organic Chemical Manufacturing Industry and Group I & II Polymers and Resins Industry”. The final rule was sent to OMB on January 22^nd, 2024 and has a court ordered publication date of today (the EPA will miss this deadline). The notice of proposed rulemaking was published on April 25^th, 2023.

According to the Fall 2023 Unified Agenda entry for this rulemaking:

“This action will address the agency's technology review under Clean Air Act (CAA) section 112(d)(6) of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for four subparts in 40 CFR part 63 (subparts F, G, H, and I) which are commonly referred to together as the Hazardous Organic NESHAP (HON) and that apply to the Synthetic Organic Chemical Manufacturing Industry (SOCMI) and to equipment leaks from certain non-SOCMI processes. This action will also address the agency's technology review of the NESHAP for two subparts in 40 CFR part 63 (subparts U and W) that apply to the Group I and Group II Polymers and Resins industries. The HON standards were most recently updated when the agency conducted a residual risk and technology review (RTR) on December 21, 2006. Similarly, the Group I and II Polymers and Resins NESHAP were most recently updated when the agency conducted its RTR on December 16, 2008, and April 21, 2011. The HON and Group I and II Polymers and Resins NESHAP contain maximum achievable control technology (MACT) standards for controlling emissions of hazardous air pollutants (HAP) from process vents, storage vessels, transfer operations, heat exchange systems, wastewater streams, and equipment leaks. The HAP emitted from these emission sources include, but are not limited to, ethylene oxide, benzene, 1,3-butadiene, vinyl chloride, ethylene dichloride, methanol, hexane, toluene, xylenes, and chloroprene. The agency also plans to consider risks from the SOCMI source category and from the Neoprene Production source category in the Group I Polymers and Resins NESHAP during its technology review and to ensure the standards continue to provide an ample margin of safety to protect public health. Lastly, this action will also address the agency's review, under CAA section 111(b)(1)(B), of four New Source Performance Standards (NSPS) in 40 CFR part 60 (subparts III, NNN, RRR, and VVa) for emissions of Volatile Organic Compound (VOC) from SOCMI air oxidation unit processes, SOCMI distillation operations, SOCMI reactor processes, and equipment leaks located at SOCMI sources. These subparts were originally promulgated pursuant to section 111(b) of the CAA on June 29,1990 (subparts III and NNN), August 31, 1993 (subpart RRR), and November 16, 2007 (subpart VVa). On April 25, 2023, the EPA published a proposed rulemaking in the Federal Register (see 88 FR 25080) for this action. In addition, the EPA has conducted public outreach activities, including hosting an informational webinar on April 13, 2023, and holding a public hearing on the proposed rulemaking on May 16, 2023.”

This is potentially an important EPA regulatory update for the specialty chemical industry. I do not plan a detailed examination of the rule in this blog, but I do plan to publicize its publication in a Short Takes post.