Document K6OvbmQaVw0Ey0v5d296GXKoN

#1 - Scrubbers - Performance Testing and Establishment of Operating Parameters - 63.124(a)(2)(viii) Dow proposes an extension for the scrubber monitoring requirements until December 12, 2027. This will allow time for the scrubbers to be placed into the service by July 15, 2027, and for the site to conduct performance testing and to work with the regulatory agencies to establish operating parameters. #2 - Scrubbers -- Continuous Monitoring of Operating Parameters -- 63.124(b)(6) Dow proposes an extension of these requirements until December 12, 2027, since the requirements in this section require the scrubbers to be in operation. Then, a performance test is required to establish the parameters that will be monitored on a continuous basis. This timing also aligns with the submittal of the Notification of Compliance Status report. #3 -- Scrubber Recordkeeping Requirements for Periods During Which Operating Values Are Outside of the Operating Limits Specified in 63.124(b)(6) - 63.118(f)(5) Dow proposes an extension for these scrubber recordkeeping requirements in this section until December 12, 2027, to allow time for the scrubber to be placed into service, tested, and for operating parameters to be established. #4 - Notification of Compliance Status Report - 63.152(b)(8) Dow proposes that the due date for this report in be extended to December 12, 2027, to align with a date 150 days after the requested date extension for having the scrubbers in service to conduct testing and to determine the operational parameters to monitor. #5 -- Periodic Report - 63.152(c), 63.118(f)(5) and 63.108(1)(2) Dow proposes that the due date for this report be extended to December 12, 2027, to align with a date 150 days after the requested date extension for having the scrubber in service. Portions of these sections require some scrubber operating data, such as periods during which operating values are outside of the applicable operating limits. Specify any additional conditions that the Administrator (or the State) deems necessary to assure installation of the necessary controls and protection of the health of persons during the extension period. No additional information is being provided with this update. Page 7 Sierra Club FOIA 2025-EPA-04883 ED_018388_00000034-00007 SC_EVERSPLIT0005207