On November 9, 2004, a Kinder Morgan pipeline in Walnut Creek, California was struck by a backhoe, causing a gasoline spill that ignited in an explosive fireball, incinerating five workers and severely injuring four others. CalOSHA (California Occupational Safety and Health Administration) cited Kinder Morgan for failure to accurately mark and map the pipeline location. In 2005, the California Fire Marshal fined Kinder Morgan $500,000 for its role in the "completely preventable" tragedy. Kinder Morgan agreed to upgrade pipeline inspection methods and improve corrosion control. In 2007, the Kinder Morgan subsidiary was found guilty of 6 felonies in the case and was fined $15 million. The company was assessed another $69 million in civil penalties.