Document jVQMYjMoQgN9mdVL5ojyX0v5

Vestlake PO Box 2449 Sulphur LA 70664 Tel 337 583 3100 Westlake's HON regulated units at the Petrochemical Complex, Styrene Monomer Production Facility, and Styrene Marine Terminal produce foundational raw materials including ethylene, propylene, and styrene which are the building blocks for plastics used in industries which play fundamental roles in national security including the medical and healthcare, food processing, agricultural, energy production, semi-conductor, building products, and automotive industries. National security interests broadly include any potential for disruption to public health and welfare, threats to water or food supplies and supply chain risk management along with the economic security previously noted in this request. Westlake's products serve as key raw materials for industries that play critical roles in the United States' national security interests. The time needed and challenges involved in coming into compliance with the complex and voluminous new requirements under the HON rule could lead to potential decreases in production or possible outages at regulated facilities including Westlake's Petrochemical Complex, Styrene Monomer Production Facility, and Styrene Marine Terminal jeopardizing or impacting our downstream customers' industries. This letter serves to reinforce the urgency of our request and to respond to EPA's call for additional information. We are prepared to provide further company-specific details should the President consider facility-specific exemptions. We appreciate your attention to this matter and urge swift action. Sincerely, Oar rQS Sr. Plant Manager, Chemicals CC: Aaron Szabo, Senior Advisor to the Administrator, Office of the Administrator Szabo.Aaron!epa..gov; Abigale Tardif, Principal Deputy Administrator, Office of Air and Radiation o Tardif.Abigalgbepa.gov; Sean Donahue, Principal Deputy General Counsel, Office of General Counsel donalme.seaneepa.ov; Alex Dominguez, Deputy Assistant Administrator for Mobile Sources, Office of Air and Radiation o dom inguez.alexanderrdepa.gov; Peter Tsirigotis, Director, Office of Air Quality Planning and Standards 0 Ts r got is. Peterfdepa, gov; Penny Lassiter, Director, Sector Policies and Programs Division, Office of Air Quality Planning and Standards Lassiter.Pennvaepa.g,ov; Patrick Lessard, Refining and Chemical Group Leader, Office of Air Quality Planning and Standards Lessard.Patrick(depa.gov; Andrew Bouchard, General Engineer, EPA Office of Air Quality Planning and Standards o Bouchard.Andreweepa.gov , www.Westlake.com Sierra Club FOIA 2025-EPA-04883 Page 4 of 4 ED_018388_00000104-00004 SC_EVERSPLIT0005666