Several nearby residents were evacuated as a precaution and were allowed back in their homes after the leak was mitigated. Many area residents called 911 to report smelling the odor.
Fond du Lac Hazardous Materials Team members assembled and began testing air quality both outside and inside the plant.
Emergency repairs were made a machine inside the plant which caused the ammonia tank to over pressurize resulting in an automatic pressure relief valve to activate.
The FDLFD was assisted by the FDLPD and the FDL Department of Public Works.