{"abstract":"The Environmental Protection Agency (EPA) is approving a revision to the Indiana State Implementation Plan (SIP), authorizing temporary alternate opacity limits (TAOLs) at the American Electric Power, Rockport (AEP Rockport) facility during periods of boiler startup and shutdown. This action is consistent with the Clean Air Act (CAA), the Indiana SIP, and EPA policy regarding emissions during periods of startup and shutdown. Indiana has provided an air quality analysis demonstrating that this revision will continue to protect the applicable National Ambient Air Quality Standards (NAAQS) for fine particulate matter (PM<INF>2.5</INF>) in Spencer County, Indiana.","action":"Final 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/2016/09/30/2016-23296.html","cfr_references":[{"chapter":null,"citation_url":null,"part":52,"title":40}],"citation":"81 FR 67186","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This final rule is effective on October 31, 2016.","disposition_notes":null,"docket_ids":["EPA-R05-OAR-2015-0074","FRL-9953-14-Region 5"],"dockets":[],"document_number":"2016-23296","effective_on":"2016-10-31","end_page":67190,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2016/09/30/2016-23296.xml","html_url":"https://www.federalregister.gov/documents/2016/09/30/2016-23296/air-plan-approval-indiana-temporary-alternate-opacity-limits-for-american-electric-power-rockport","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2016-23296?publication_date=2016-09-30","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2016-09-30/2016-23296/mods.xml","not_received_for_publication":null,"page_length":5,"page_views":{"count":126,"last_updated":"2026-09-23 06:15:06 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2016-09-30/pdf/2016-23296.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2016-23296.pdf?1475153137","publication_date":"2016-09-30","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2016/09/30/2016-23296.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Indiana January 28, 2015 SIP Submittal Clarification Letter","document_id":"EPA-R05-OAR-2015-0074-0003"},{"title":"Indiana AEP Rockport, 01/13/2015 submittal","document_id":"EPA-R05-OAR-2015-0074-0002"}],"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=EPA-R05-OAR-2015-0074","supporting_documents_count":2,"docket_id":"EPA-R05-OAR-2015-0074","regulation_id_number":null,"title":"Indiana AEP Rockport, 326 IAC 5, LSA #12-392","checked_regulationsdotgov_at":"2016-10-20T06:00:18Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":67186,"subtype":null,"title":"Air Plan Approval; Indiana; Temporary Alternate Opacity Limits for American Electric Power, Rockport","toc_doc":"Indiana; Temporary Alternate Opacity Limits for American Electric Power, Rockport","toc_subject":"Air Quality State Implementation Plans; Approvals and Promulgations:","topics":["Air pollution control","Environmental protection","Incorporation by reference","Intergovernmental relations","Particulate matter","Reporting and recordkeeping requirements"],"type":"Rule","volume":81}