(Reuters) — The U.S. Chemical Safety Board (CSB) has wrapped up a two-year investigation of a Feb. 18, 2015, explosion at a Torrance, Cal., refinery then owned by Exxon Mobil Corp. It found that weaknesses in Exxon Mobil’s process safety management program led to the explosion, which caused minor injuries to four workers and spiked West Coast gasoline prices.
