The California Division of Occupational Safety and Health (Cal/OSHA) issued 19 citations to ExxonMobil Refining & Supply Company and proposed $566,000 in penalties for workplace safety and health violations stemming from the February 2015 explosion at the company’s Torrance refinery. Four workers were injured in the explosion, which was caused by a hydrocarbon release from the refinery’s fluid catalytic cracker unit into its electrostatic precipitator. Cal/OSHA found that Exxon did not take action to eliminate known hazardous conditions at the refinery and intentionally failed to comply with state safety standards.