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EPA/OAR RIN: 2060-AU25 Publication ID: Spring 2020 
Title: National Emission Standards for Hazardous Air Pollutants: Amendment of Phosphoric Acid Mercury Limit 
Abstract: In 1999, the Phosphoric Acid Production NESHAP set maximum achievable control technology (MACT) standards for phosphate rock calciners that regulated mercury emissions by means of standards for particulate matter. In 2015, EPA promulgated the residual risk and technology review for this source category, and further amended the standards in September 2017. The revised standards established mercury emission limits for calciners based on the one source that operates phosphate rock calciners, The Potash Corporation of Saskatchewan (PCS) Phosphate, now Nutrien, Aurora. PCS/Nutrien has requested EPA review the Phosphoric Acid Production NESHAP mercury standards. This proposed rule will consider additional mercury test data that were not available at the time the rule was promulgated and that are relevant to the average performance of the source used to set the MACT floor mercury emissions for calciners. 
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 
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:
Action Source Description Date
Action Date FR Cite
NPRM  04/07/2020  85 FR 19412   
NPRM Comment Period End  05/22/2020 
Final Rule  09/00/2020 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
Sectors Affected: 325312 Phosphatic Fertilizer Manufacturing 
RIN Data Printed in the FR: No 
Agency Contact:
Keith Barnett
Environmental Protection Agency
Office of Air and Radiation
Research Triangle Park, NC 27711
Phone:919 541-5605
Fax:919 541-4991