On March 27, 2020, General Mills contractor utility technicians and General Mills operations noted there was a strong smell of ammonia in the cereal processing area. Plant personnel immediately evacuated the facility and called the City of Albuquerque fire department. General Mills personnel discovered the gasket on a compressor oil filter extending outside of the flange, which caused the leak of oil and ammonia. The release event resulted in tapproximately 2,989 pounds ammonia released to the atmosphere, a violation of the General Duty Clause, Clean Air Act 112(r)(1) - Failure to minimize the consequences of an accidental release when it occurred. Certain monitoring and personal protective equipment which would have allowed trained facility personnel to mitigate the duration and quantity of the release more quickly were located in the area of the release, and therefore not immediately available.