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EPA/OAR RIN: 2060-AU65 Publication ID: Fall 2021 
Title: National Emission Standards for Hazardous Air Pollutants: Primary Magnesium Refining Residual Risk and Technology Review 

This action will address the agency’s residual risk and technology review (RTR) of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Primary Magnesium Refining. The Primary Magnesium Refining NESHAP, subpart TTTTT, was promulgated pursuant to section 112(d) of the Clean Air Act (CAA) on October 10, 2003. The NESHAP established emission limitations, work practice standards, and operation and maintenance requirements based on maximum achievable control technology (MACT) for controlling emissions of hazardous air pollutants (HAP) from spray dryers, magnesium chloride storage bins, melt/reactor systems, and launder off-gas systems. The HAP emitted from these sources include, but are not limited to, hydrochloric acid, chlorine, dioxins and metal HAP. This action will implement the residual risk review requirements of CAA section 112(f)(2) and the technology review requirements of CAA section 112(d)(6). The statute directs the EPA to promulgate emission standards under CAA 112(f)(2) if such standards 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. Any such standards are to be promulgated within 8 years after promulgation of MACT standards under CAA section 112(d). 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 (Community In-Power and Development Association v. Pruitt, No. 16-cv-1074KBJ (D.D.C. 2018)), the EPA is obligated to complete this final action by August 1, 2022.

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 63 subpart LLL   
Legal Authority: 42 U.S.C. 7412 Clean Air Act    42 U.S.C. 7607(d)(7)(B)   
Legal Deadline:
Action Source Description Date
Final  Judicial  16-cv-01074-KBJ; 3/31/18.  08/01/2022 
Action Date FR Cite
NPRM  01/08/2021  86 FR 1390   
NPRM Comment Period End  02/22/2021 
Final Rule  08/00/2022 
Additional Information: EPA-HQ-OAR-2020-0535.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
Sectors Affected: 331410 Nonferrous Metal (except Aluminum) Smelting and Refining 
RIN Data Printed in the FR: No 
Agency Contact:
Nathan Topham
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code D243-02,
Research Triangle Park, NC 27711
Phone:919 541-0483
Fax:919 541-4991

Chuck French
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code D243-02,
Research Triangle Park, NC 27711
Phone:919 541-7912
Fax:919 541-4991