Abstract: At approximately 3:22 p.m. on March 2, 2005, an employee was working at the City of Los Angeles DWP Castiac Power Plant, a hydroelectric generation facility. A construction subcontractor, Voith Siemens Hydro Generation, Inc., employed him. The employee was disposing an outdated epoxy (Number 849) by mixing two components together. The mixture reacted by generating a toxic irritant plume that migrated throughout the work area. Twenty employees from the City of Los Angeles DWP Castiac Power Plant were affected by inhaling the irritant vapors. The employees were sent to the hospital for observation and released. (None of the employees were listed on injury lines on the original form.)