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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) that apply to the Synthetic Organic Chemical Manufacturing Industry (SOCMI) and to equipment leaks from certain non-SOCMI processes. These four NESHAP are more commonly referred to together as the Hazardous Organic NESHAP (HON). The HON standards were promulgated pursuant to section 112(d) of the CAA on April 22, 1994, and more recently, the agency conducted a residual risk and technology review (RTR) of the HON on December 21, 2006. The HON contains 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 conduct a risk assessment to consider risks from the SOCMI source category during its technology review and to ensure the HON 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).

Overall Description of Deadline: United States District Court for the District of Columbia, Texas Environmental Justice Advocacy Services, California Communities Against Toxics Environmental Integrity Project, Louisiana Environmental Action Network, Ohio Valley Environmental Council, Rise St. James, and Sierra Club Plaintiffs, v. United States Environmental Protection Agency, Defendant. Civil Action No. 1:20-cv-03733-RJL