EPA Region 4 conducted a mobile source inspection at the Respondent's facility on April 24, 2024. The information collected from Respondent during the inspection, covering the period of May 22, 2023, through March 1, 2024, provided evidence that Respondent tapered with EPA-certified motor vehicles and/or motor vehicle engines by removing or rendering inoperative emission control components on the vehicles/engines. It is a violation of Section 203(a)(3)(A) of CAA, 42 U.S.C. Section 7522(a)(3)(A), to tamper with EPA-certified vehicles and engines.