On May 17,2012, authorized representatives of the EPA conducted an inspection of the Respondent's facility located at 4739 West State Highway 156, Torrington, Wyoming, with the consent of the Respondent, to determine compliance with CAA section 112(r)(7). During the EPA inspection. the EPA representatives observed alleged violations of the CAA section 112(r)(7). Safe upper and lower limits had not been compiled for the covered process. Equipment specifications had not been compiled and maintained for the denaturant process vessels, TK-7 and TK-8. The required National fire Protection Association (NFPA) labels were not installed on vessels TK-7 and TK-8. The required Hazard Review did not include hazards associated with fire, did not identify safeguards, and did not address if the process is designed, fabricated, and operated in accordance with the applicable standards or niles. The maintenance program did not include updated records for the calibration of the multi-gas monitor and did not ensure that inspections and tests on process equipment were in accordance with recognized and generally accepted good engineering practices. Respondent also did not have written mechanical integrity procedures in place to be used by employees involved in the inspection and maintenance of process vessels