Abstract: At approximately 11:10 on February 1, 1994, Employees #1 and #2 were at a sewage treatment plant installing two large butterfly valves into an effluent channel. Employee #2 was at the bottom of the channel, which had been pumped down to a workable level so that the new valve could be installed. Employee #2 was using a pneumatic chipping hammer on the concrete walls when a flash fire occurred, completely engulfing him in flames. Employee #1, who observed the fire from his standpoint, jumped into the channel to help Employee #2. Employee #1 caught on fire as soon as he jumped into the channel. Both employees received second-degree burns over 60 to 80 percent of their bodies. Employees #1 and #2 were transported and admitted to UCI Burn Center for emergency treatment. Employee #2 died on February 3, 1994 and Employee #1 died on February 4, 1994. The cause of death in both cases was the extensive second-degree burns that the employees sustained.