Abstract: On July 3, 2009, Employee #1 poured the wrong chemical into a pressure vessel, located in service chase, and brought the canister back to the chemical laboratory to dispose the mixture. The mixed chemicals were transferred by another technician to a carboy container and set it on the floor and left. A chemical exothermic reaction began within the carboy. The reaction caused a rapture of the container and release of 4-gallons diluted ammonium hydroxide, hydrogen peroxide, and deionized water. The chemical spill spread on the floor. When Employee #1 entered the chemical lab, he slipped on the floor. Employee #1 was rinsed with water and was taken by ambulance to the hospital, where he was hospitalized.