On July 1, 2017, a stock acquisition transferred full ownership of Alon USA Energy, Inc. to Delek US Holdings, Inc. Delek US Holdings, Inc. (Delek) will conduct multimedia environmental audits at the Big Spring and Krotz Springs Refineries. Delek acquired the refineries through the purchase of Alon USA Energy, Inc., which includes its entities Alon USA, LP and Alon Refining Krotz Springs, Inc. The scope of the audits will include an assessment of compliance with the applicable provisions of the following regulatory programs, as well as their related permits: 1) Stationary source (e.g. NSPS, NESHAP) and fuels provisions (40 CFR Parts 79 and 80) under the Clean Air Act; 2) NPDES effluent guidelines and oil discharge and pollution prevention provisions under the Clean Water Act; 3) Drinking water standards and UIC provisions under the Safe Water Drinking Act; 4) Solid waste, hazardous waste, used oil, universal waste and UST provisions under the Resource Conservation and Recovery Act; 5) Inventory reporting and PCB management provisions under the Toxic Substances Control Act; 6) Release reporting provisions under the Comprehensive Environmental Response, Compensation, and Liability Act; 7) Emergency planning/notification and hazardous and toxic chemical reporting provisions under the Emergency Planning and Community Right-to-Know Act. Delek proposes completing the audit of both refineries by December 31, 2017, and disclosing violations by January 31, 2018. In its disclosures, th