After an explosion occurred at a truck yard owned by Quick Transport of Arkansas, LLC, the Occupational Safety and Health Administration issued the company a one-item serious citation alleging a violation of section 5(a)(1) of the Occupational Safety and Health Act, 29 U.S.C. § 654(a)(1), with a $7,000 proposed penalty. The Secretary claims that Quick Transport exposed its employees to an explosion hazard by allowing them to use a propane torch to thaw frozen valves on vacuum truck trailers used in “fracking” operations.