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EPA/OAR RIN: 2060-AU25 Publication ID: Fall 2018 
Title: ●National Emission Standards for Hazardous Air Pollutants: Phosphoric Acid Production Mercury Limit Reconsideration 

The Potash Corporation of Saskatchewan (PCS) Phosphate, now Nutrien, Aurora; has petitioned EPA for reconsideration of the NESHAP Mercury (Hg) limit. One source (PCS-Aurora, N.C.) operates calciners and, therefore, defines the maximum achievable control technology (MACT) floor for hazardous air pollutant emissions. In 1999, the Phosphoric Acid Production NESHAP set MACT standards for calciners that regulated total fluoride as a surrogate for hydrogen fluoride and established particulate matter limits as surrogates for Hg. In 2015, EPA promulgated the residual risk and technology review for this source category, and further amended the standards in September 2017. The proposed rule will consider additional Hg data received from PCS/Nutrien concerning the MACT floor emission limits for calciners.

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: Undetermined 
EO 13771 Designation: Not subject to, not significant 
CFR Citation: 40 CFR 63   
Legal Authority: 42 U.S.C. 7412, Clean Air Act   
Legal Deadline:  None
Action Date FR Cite
NPRM  06/00/2019 
Regulatory Flexibility Analysis Required: Undetermined  Government Levels Affected: None 
Federalism: Undetermined 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Susan Fairchild
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code D-243-04,
Research Triangle Park, NC 27711
Phone:919 541-5167

Jennifer Caparoso
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code E143-01,
Research Triangle Park, NC 27711
Phone:919 541-4063
Fax:919 541-0516