{"abstract":"The U.S. Environmental Protection Agency (EPA) is proposing the results of the residual risk and technology review (RTR) of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for mercury emissions from Mercury Cell Chlor-Alkali Plants, as required by the Clean Air Act (CAA). The EPA is proposing to find risks due to emissions of hazardous air pollutants (HAP) to be acceptable from the Mercury Cell Chlor-Alkali Plants source category, and to determine that the current NESHAP provides an ample margin of safety to protect public health and that no more stringent standards are necessary to prevent, taking into consideration costs, energy, safety, and other relevant factors, an adverse environmental effect. The EPA is proposing to amend the requirements for cell room fugitive mercury emissions to require work practice standards for the cell rooms and to require instrumental monitoring of cell room fugitive mercury emissions under the technology review. Furthermore, under our technology review and maximum achievable control technology (MACT) analysis, we are proposing to not require conversion to non-mercury production technology and invite comments and data and information regarding this proposed determination. In addition, the EPA is proposing standards for fugitive chlorine emissions from mercury cell chlor-alkali plants, which are not currently regulated under the NESHAP. The EPA is proposing to address applicability for thermal mercury recovery units when chlorine and caustic are no longer produced in mercury cells. The EPA is also proposing revisions related to emissions during periods of startup, shutdown, and malfunction (SSM); provisions for electronic submission of performance test results, performance evaluation reports, and Notification of Compliance Status (NOCS) reports; and correction of various compliance errors in the current rule.","action":"Proposed rule.","agencies":[{"raw_name":"ENVIRONMENTAL PROTECTION AGENCY","name":"Environmental Protection Agency","id":145,"url":"https://www.federalregister.gov/agencies/environmental-protection-agency","json_url":"https://www.federalregister.gov/api/v1/agencies/145","parent_id":null,"slug":"environmental-protection-agency"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2021/01/08/2021-00174.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"63","title":40}],"citation":"86 FR 1362","comment_url":null,"comments_close_on":"2021-02-22","correction_of":null,"corrections":[],"dates":"Comments. Comments must be received on or before February 22, 2021. Under the Paperwork Reduction Act (PRA), comments on the information collection provisions are best assured of consideration if the Office of Management and Budget (OMB) receives a copy of your comments on or before February 8, 2021.","disposition_notes":null,"docket_ids":["EPA-HQ-OAR-2020-0560","FRL-10018-95-OAR"],"dockets":[{"supporting_documents":[{"title":"Mercury Cell Final RTR ICR Spreadsheet","document_id":"EPA-HQ-OAR-2020-0560-0061"},{"title":"EPA Response to 03-10-2022 OMB EIA Comments","document_id":"EPA-HQ-OAR-2020-0560-0060"},{"title":"EPA response to 03-10-2022 OMB final rule comments","document_id":"EPA-HQ-OAR-2020-0560-0058"},{"title":"OMB comments on EIA and final rule 03-10-2022","document_id":"EPA-HQ-OAR-2020-0560-0057"},{"title":"Mercury Cell Final RTR ICR Supporting Statement","document_id":"EPA-HQ-OAR-2020-0560-0056"},{"title":"Mercury Cell final rule redline/strikeout","document_id":"EPA-HQ-OAR-2020-0560-0055"},{"title":"Final Rule Sent for OMB and Interagency Review 01262022","document_id":"EPA-HQ-OAR-2020-0560-0054"},{"title":"EIA Sent for OMB and Interagency Review 01192022","document_id":"EPA-HQ-OAR-2020-0560-0052"},{"title":"ASHTA to eliminate use of mercury - Star Beacon, Astabula, Ohio newspaper article","document_id":"EPA-HQ-OAR-2020-0560-0051"},{"title":"Investment Under Uncertainty - Chapter 1, A New View of Investment, Princeton University Press, 1994","document_id":"EPA-HQ-OAR-2020-0560-0048"}],"agency_name":null,"documents":[{"comment_count":4,"comment_start_date":"2021-01-08","updated_at":"2023-02-28T13:11:48.346-05:00","comment_url":"https://www.regulations.gov/commenton/EPA-HQ-OAR-2020-0560-0001","allow_late_comments":null,"id":"EPA-HQ-OAR-2020-0560-0001","comment_end_date":"2021-03-25","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":58,"id":"EPA-HQ-OAR-2020-0560","title":"National Emission Standards for Hazardous Air Pollutants: Mercury Cell Chlor-Alkali Plants Residual Risk and Technology Review"}],"document_number":"2021-00174","effective_on":null,"end_page":1390,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2021/01/08/2021-00174.xml","html_url":"https://www.federalregister.gov/documents/2021/01/08/2021-00174/national-emission-standards-for-hazardous-air-pollutants-mercury-cell-chlor-alkali-plants-residual","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2021-00174?publication_date=2021-01-08","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2021-01-08/2021-00174/mods.xml","not_received_for_publication":null,"page_length":29,"page_views":{"count":925,"last_updated":"2026-10-22 18:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2021-01-08/pdf/2021-00174.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2021-00174.pdf?1610027144","publication_date":"2021-01-08","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2021/01/08/2021-00174.txt","regulation_id_number_info":{"2060-AU59":{"issue":"202110","html_url":"https://www.federalregister.gov/regulations/2060-AU59/national-emission-standards-for-hazardous-air-pollutants-mercury-cell-chlor-alkali-plants-residual-r","title":"National Emission Standards for Hazardous Air Pollutants: Mercury Cell Chlor-Alkali Plants Residual Risk and Technology Review","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202110&RIN=2060-AU59&operation=OPERATION_EXPORT_XML","priority_category":"Other Significant"}},"regulation_id_numbers":["2060-AU59"],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Mercury Cell Final RTR ICR Spreadsheet","document_id":"EPA-HQ-OAR-2020-0560-0061"},{"title":"EPA Response to 03-10-2022 OMB EIA Comments","document_id":"EPA-HQ-OAR-2020-0560-0060"},{"title":"EPA response to 03-10-2022 OMB final rule comments","document_id":"EPA-HQ-OAR-2020-0560-0058"},{"title":"OMB comments on EIA and final rule 03-10-2022","document_id":"EPA-HQ-OAR-2020-0560-0057"},{"title":"Mercury Cell Final RTR ICR Supporting Statement","document_id":"EPA-HQ-OAR-2020-0560-0056"},{"title":"Mercury Cell final rule redline/strikeout","document_id":"EPA-HQ-OAR-2020-0560-0055"},{"title":"Final Rule Sent for OMB and Interagency Review 01262022","document_id":"EPA-HQ-OAR-2020-0560-0054"},{"title":"EIA Sent for OMB and Interagency Review 01192022","document_id":"EPA-HQ-OAR-2020-0560-0052"},{"title":"ASHTA to eliminate use of mercury - 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