On February 5, 2024, EPA sent Respondent a Notice letter. EPA conducted an investigation of the Facility on April 22, 2025, to determine Respondent?s compliance with Section 112(r) of the CAA, 42 U.S.C. ? 7412(r), and 40 C.F.R. Part 68 (the ?Investigation?). Based upon the information gathered during the Investigation, EPA determined that Respondent violated certain provisions of the CAA.