The facility uses anhydrous ammonia, an extremely hazardous substance - subjecting them to the Clean Air Act General Duty Clause requirements. The facility failed to identify hazards which may result from such releases using appropriate hazard assessment techniques; failure to design and maintain a safe facility taking such steps as are necessary to prevent releases; and failure to minimize the consequences of accidental releases which do occur in violation of section 112(r) of the CAA, 42 U.S.C. ? 7412(r)(1), at the Superior Farms facility in Denver, Colorado.