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EPA/AR RIN: 2060-AQ92 Publication ID: Spring 2015 
Title: National Emission Standards for Hazardous Air Pollutants: Primary Aluminum Reduction Plants 

The Clean Air Act (CAA) requires EPA to review maximum achievable control technology (MACT) standards and to revise them "as necessary (taking into account developments in practices, processes and control technologies)" no less frequently than every eight years. Under the "residual risk" provision of the CAA, EPA must evaluate the MACT standards within eight years after promulgation and promulgate standards, if required, to provide an ample margin of safety to protect public health or prevent an adverse environmental effect while considering the economic impacts of controls, technological feasibility, uncertainties and any other relevant factors. The EPA promulgated National Emission Standards for Hazardous Air Pollutants (NESHAP) for Primary Aluminum Reduction Plants (found in 40 CFR part 63, subpart LL) in 1997. This NESHAP applies to the owner or operator of each new pitch storage tank or new or existing potline, paste production plant, or anode bake furnace associated with primary aluminum reduction which is located at a major source, as defined in 40 CFR section 63.2. The EPA proposed standards addressing residual risk and technology developments on December 6, 2011. The EPA published a supplemental proposal on December 8, 2014. If finalized, the amendments will include new emissions standards for carbonyl sulfide emissions from new and existing potlines; new emissions standards for particulate matter (PM, as a surrogate for HAP metals) emissions from new and existing potlines, anode bake furnaces and paste production plants; new emissions standards for polycyclic organic matter (POM) emissions from new and existing prebake potlines and existing pitch storage tanks; new risk-based emissions standards for arsenic and nickel emissions from new and existing Soderberg potlines; reduce the emissions standards for POM from existing Soderberg potlines; eliminate the startup, shutdown and malfunction exemption; and make certain other technical and editorial changes.

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 112   
Legal Authority: 42 U.S.C. 7412 Clean Air Act   
Legal Deadline:
Action Source Description Date
Final  Judicial  09-cv-00152; USDC Northern District of California, filed 08/07/14  08/14/2015 
Action Date FR Cite
NPRM  12/06/2011  76 FR 76260   
NPRM Comment Period Extended  01/19/2012  77 FR 2677   
Supplemental NPRM  12/08/2014  79 FR 72913   
Supplemental NPRM  01/15/2015  80 FR 2067   
Final Rule  09/00/2015 
Additional Information: Docket #:EPA-HQ-OAR-2011-0797
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
Sectors Affected: 331313 Alumina Refining and Primary Aluminum Production 
RIN Data Printed in the FR: No 
Agency Contact:
David Putney
Environmental Protection Agency
Air and Radiation
109 T.W. Alexander Drive, Mail Code D-243-02,
Research Triangle Park, NC 27711
Phone:919 541-2016
Fax:919 541-4991

Rochelle Boyd
Environmental Protection Agency
Air and Radiation
109 T.W. Alexander Drive, Mail Code D-243-02,
Research Triangle Park, NC 27711
Phone:919 541-1390