Respondent owned and operated an oil refinery which operates a variety of processes to produce petroleum products (e.g., propane, butane, gasoline, diesel, jet fuel, furnace oil, etc.) from raw crude oil. On August 11-14, 2014, EPA conducted an inspection of the Facility focused on compliance with CAA§ 112(r) and 40 C.F.R. Part 68. The regulated substances that are held above the threshold quantities identified in 40 C.F.R. § 68.130 are: propane, butane, and hydrogen sulfide.