Document jyLKODjDnRdxY49k6g9LJRv2R

Message From: Sent: To: Subject: AirAction [/O=EXCHANGELABS/OU=EXCHANGE ADMINISTRATIVE GROUP (FYDIBOHF23SPDLT)/CN=RECIPIENTS/CN=FA78B98923384078995E04A73D258D83-AIRACTION] 4/2/2025 12:09:58 PM Lanthier, Darren [dlanthier@westlake.com] CORRECTION: Updated email address for CBI related to the Presidential Exemption In the previous email, an incorrect email address was provided for the submission of electronic Confidential Business Information (CBI). The email address should be: OAQPS_CBI@epa.gov Thank you. From: AirAction Sent: Tuesday, April 1, 2025 9:12 AM To: Lanthier, Darren <dlanthier@westlake.com> Subject: RE: Presidential Exemption: NSPS & NESHAP for SOCMI & Group I & II Polymers and Resins Industry - Westlake Chemical OpCo LP & Westlake Styrene LLC Thank you for entailing the AirAction mailbox to request a Presidential Exemption under section 1 12(i)(4) of the Clean Air Act and for engiwinv. with EPA in advancing President Trump's Executive Orders and Powerinv. the Great American Comeback. We have received your email and will be in contact soon. If you have Confidential Business Information (CBI) that you'd like to submit, please submit it in electronic version to the CBI "ir cpa.tio\ inbox or in hardcopy to: USEPA, OAQPS CORE CBI Office 4930 Old Page Road Durham, SIC 27703 From: Lanthier, Darren <dlarthier@westlake.com> Sent: Monday, March 31, 2025 4:02 PM To: AirAction <AirAction@epa.gov> Cc: Szabo, Aaron <Szabo.Aaron@epa.gov>; Tardif, Abigale (Abbie) <Tardif.Abigale@epa.gov>; Donahue, Sean <donahue.sean@epa.gov>; Dominguez, Alexander <ciominguez.alexancier@epa.gov>; Tsirigotis, Peter <Tsingotis.Peter@epa.gov>; Lassiter, Penny <Lassiter.Penny@epa.gov>; Lessard, Patrick <Lessarci.Patrick@epa.gov>; Bouchard, Andrew <Boucharci.Ancirew@epa.gov> Subject: Presidential Exemption: NSPS Ee NESHAP for SOCMI & Group I & II Polymers and Resins Industry - Westlake Chemical OpCo LP & Westlake Styrene LLC Caution: This email originated from outside EPA, please exercise additional caution when deciding whether to open attachments or click on provided links. I To whom it may concern -- Please see attached, a request for Presidential Exemption for Westlake Chemical OpCo LP's & Westlake Styrene LLC's HON-covered facilities at 900 Highway 108, Sulphur, Louisiana 70665 and 1910 Paktank Rd, Sulphur, LA 70665 as by U.S. EPA of the regulated community. As explained in greater detail in the attached letter, Westlake is seeking a Presidential Exemption under the New Source Performance Standards for the Synthetic Organic Chemical Sierra Club FOIA 2025-EPA-04883 ED_018388_00005723-00001 SC_EVERSPLIT0014890 Manufacturing Industry and National Emission Standards for Hazardous Air Pollutants for the Synthetic Organic Chemical Manufacturing Industry and Group I & II Polymers and Resins. See 89 FR 42932; May 16, 2024 (HON rule). As Westlake's evaluation of the requirements under the HON rule progresses and we continue to develop our compliance plans, Westlake may have additional detail or more concrete information related to the technical challenges, time required and costs for coming into compliance with the HON rule. Some of that more detailed information may include confidential business information which Westlake would be willing to provide under the appropriate protections for such competitive and trade secret information. Please contact me (Darren Lanthier) at dlanthier@westlake.com should EPA or the President require more detailed information about specific impacts to Westlake's Petrochemical (Ethylene Manufacturing) Complex , Styrene Monomer Production and/or Styrene Marine Terminal Facilities. Thank you for the timely consideration of this request. Darren Lanthier I Manager -- Environmental PE&O dlanthierewestlake.com (337) 302-8050 tiesttake 3525 Cities Service Hwy, Sulphur, Louisiana 70663 I wvvw.westlake.com Sierra Club FOIA 2025-EPA-04883 ED_018388_00005723-00002 SC_EVERSPLIT0014891