This is a Consent Agreement and Final Order (CAFO) between U.S. EPA and Estes Express Lines (Respondent), of Richmond, Virginia, for Respondent's alleged violations of the Clean Air Act requirement to comply with federally approved California State Implementation Plan regulations for diesel truck engines operating in California. To resolve the violations, Respondent agreed to pay an administrative civil penalty of $100,000 and to perform two Supplemental Environmental Projects (SEPs) at a total cost of $290,400.