Abstract: The iron and steel clean out pipe for sulfuric acid tank Number 1 rusted through from the outside. 3,500 tons of concentrated sulfuric acid leaked into a retention trench. The sulfuric acid was spraying in a five foot high fountain. The leaking sulfuric acid seeped into the chlorine bleach rinse sump and reacted with the sodium hypochlorite releasing chlorine gas. Brewer Environmental Industries employees responded to the leak and attempted to neutralize the sulfuric acid spill with soda ash. The employees did not test the atmosphere for level of exposure (chlorine gas or sulfuric acid) and wore inadequate personal protective equipment.