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This final action addresses the agency's residual risk and technology review (RTR) of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Hydrochloric Acid Production. The Hydrochloric Acid Production NESHAP, subpart NNNNN, was promulgated pursuant to section 112(d) of the Clean Air Act (CAA) on April 17, 2003. The NESHAP established emission limitations and/or work practice requirements based on maximum achievable control technology (MACT) for controlling emissions of hazardous air pollutants (HAP) from process vents, storage tanks, transfer operations, and equipment leaks. The HAP emitted from these sources include hydrochloric acid and chlorine. This action implements the residual risk review requirements of CAA section 112(f)(2) and the technology review requirements of CAA section 112(d)(6). CAA 112(f)(2) directs EPA to revise the NESHAP if such revisions are required to provide an ample margin of safety to protect public health or to prevent, taking relevant factors into account, an adverse environmental effect. CAA section 112(d)(6) requires the EPA to review and revise the MACT standards as necessary, taking into account developments in practices, processes and control technologies, no less often than every 8 years. Pursuant to a court order, the EPA is obligated to complete this action by March 13, 2020.

Overall Description of Deadline: Final Rule 3/13/2020--Court Order: United States District Court for the District of Columbia; California Communities Against Toxics, et al. v. Scott Pruitt; Case 1:15-cv-00512-TSC; 3/13/17.