On September 15, 2021, Respondent acquired ownership and commenced operation of the manufacturing facility. Isobutane is a “regulated substance” pursuant to 40 C.F.R. § 68.3. The threshold quantity for Isobutane, as listed in 40 C.F.R. § 68.130, is 10,000 pounds. Propane is a “regulated substance” pursuant to 40 C.F.R. § 68.3. The threshold quantity for propane, as listed in 40 C.F.R. § 68.130, is 10,000 pounds. On or about October 22-23, 2019, representatives of the EPA conducted an inspection of the Facility to determine compliance with Section 112(r) of the CAA and 40 C.F.R. Part 68. Information gathered during the EPA inspection revealed that 22,209 pounds of isobutane and 7,385 pounds of propane were on site at the time of inspection.