Document 9G2vr346zDNy8ZaLgXX7xQZq

be extended to July 15, 2027, to align with the start-up date of the Purge Glycol Reactor. Dow proposes that all due dates to complete the requirements in 63.151(f)(1)-- (3) be extended to December 12, 2027, to allow time for a performance demonstration and setting of parameters after the Purge Glycol Reactors start operation. Table 12 of the HON rule refers to 63.151(f), which requires compliance with paragraphs (f)(1) -- (3) as copied below. Dow proposes an extension to December 12, 2027 to complete the performance demonstration, establish parameter monitoring ranges, and commence monitoring. This is five months after the requested extension date of July 15, 2027 to have the Purge Glycol Reactors installed. The rule text for 63.151(f) and (1) -- (3) is provided below: The owner or operator who has been directed by any section of this subpart that expressly references this paragraph to set unique monitoring parameters or who requests approval to monitor a different parameter than those listed in 63.114 for process vents, C.::1127 for transfer, or C.::3.1,12 for process wastewater of this subpart shall submit the information specified in op:a2Laji,12- s.,Wr1j, and of this section with the operating permit application or as otherwise specified by the permitting authority. 40 CFR 63.151(f). (1) A description of the parameter(s) to be monitored to ensure the control technology or pollution prevention measure is operated in conformance with its design and achieves the specified emission limit, percent reduction, or nominal efficiency, and an explanation of the criteria used to select the parameter(s). (2) A description of the methods and procedures that will be used to demonstrate that the parameter indicates proper operation of the control device, the schedule for this demonstration, and a statement that the owner or operator will establish a range for the monitored parameter as part of the Notification of Compliance Status report required in . f3'.$ 1 52(1)) of -,:ubpart, unless this information has already been included in the operating permit application. (3) The frequency and content of monitoring, recording, and reporting if monitoring and recording is not continuous, or if reports of daily average values when the monitored parameter value is outside the range established in the operating permit or Notification of Compliance Status will not be included in Periodic Reports required under 152i;c.F of ths c.;JLI.):)[t.. The rationale for the proposed monitoring, recording, and reporting system shall be included. Page 9 Sierra Club FOIA 2025-EPA-04883 ED_018388_00000034-00009 SC_EVERSPLIT0005209