Respondent owns and operates a natural gas liquid extraction facility which consists of buildings, equipment, structures, and other stationary items which are located on a single site or on contiguous or adjacent sites, and which are owned or operated by the same person (the natural gas liquid extraction facility). On March 18, 2009, under Section 112(r) of the Act, and implementing regulations, 40 C.F.R. Part 68, Respondent submitted to U.S. EPA an RMP for the natural gas liquid extraction facility. According to the RMP submitted to U.S. EPA by Respondent, the natural gas liquid extraction facility: a. fell within NAICS Code 211112 as “natural gas liquid extraction,” and b. maintained flammable mixtures containing more than one percent of regulated substances in quantities exceeding 10,000 pounds. On June 2, 2011, authorized representatives of U.S. EPA conducted an inspection at the natural gas liquid extraction facility to determine its compliance with 40 C.F.R. Part 68. Under the Risk Management Program Regulations, the facility is a “stationary source” as defined in 40 C.F.R. ยง 68.3. As of August 1, 2006, when Respondent acquired ownership and operational control of the natural gas liquid extraction facility, the natural gas liquid extraction facility held for use in its operations 10,000 lbs. or more of flammable mixtures.