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From: Boonsombat, Nattaya (N) [BNattaya@dow.com] ent: 3/31/2025 6:09:48 PM AirAction [AirAction@epa.goy] object: "Presidential Exemption Request" -- HON Rule -- Union Carbide/Dow St. Charles, LA Operations ttachments:3_UCC_St Charles_for CAA 112i4 Request March 2025.pdf Caution: This email originated from outside EPA, please exercise additional caution when deciding whether to open attachments or click on provided links. Flag: Follow up To Whom it May Concern: Please find attached a letter and Attachment #1 in support of a Presidential Exemption Request for the HON rule for our St. Charles, LA Operations site. We appreciate EPA's review of this request and are happy to answer any questions as you review the attached information. Nattaya Boonsombat St. Charles , ,p___hons Responsible Care Leader Office: +1 985 783 5939 EW_VER BIG Prevent. Prot ct. Respond. General Business Sierra Club FOIA 2025-EPA-04883 ED_018388_00000045-00001 SC_EVERSPLIT0005247 From: Douglas, Sarah [sarah.douglas@bakerbotts.com] ent: 3/31/2025 6:35:37 PM o: AirAction [AirAction@epa.gov] CC: Watkins Mallick, Allison [allison.mallick@bakerbotts.com] ubject: Presidential Exemption: National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units Review of the Residual Risk and Technology Review: Rainbow Energy Center - Coal Creek Station ttachments:Rainbow_MATS Exemption Request_Coal Creek_3.31.2025.pdf Caution: This email originated from outside EPA, please exercise additional caution when deciding whether to open attachments or click on provided links. Flag: Follow up Administrator Zeldin: Please see the attached request for a two-year Presidential exemption from compliance with EPA's MATS Rule for Coal Creek Station, submitted on behalf of Rainbow Energy Center. Rainbow appreciates the opportunity to submit this request. Please let us know if you have questions or would like additional information related to this request. Thank you, Sarah Douglas KA Lc Baker Botts L.L.P. sarah.douglas@bakerbofts.com T +1.202.639.7733 M +1.858.395.3488 700 K St NW Washington, D.C. 20001 United States Sierra Club FOIA 2025-EPA-04883 ED_018388_00000047-00001 SC_EVERSPLIT0005248