This is a Notice of Availability for a Draft Supplemental Environmental Impact Statement prepared by the U.S. Army Corps of Engineers for the Matagorda Ship Channel Improvement Project near Port Lavaca, Texas. The EPA published this notice under Section 309(a) of the Clean Air Act. The public comment period closes December 29, 2025. The notice contains no substantive impact analysis; that content is in the underlying Draft Supplement itself, which is not reproduced here.12