**FILE** White smoke rises Aug. 7, 2012, from the Chevron oil refinery in Richmond, Calif., during a controlled burn conducted the morning after a toxic fire at the refinery. (Associated Press/The Contra Costa Times)
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**FILE** White smoke rises Aug. 7, 2012, from the Chevron oil refinery in Richmond, Calif., during a controlled burn conducted the morning after a toxic fire at the refinery. (Associated Press/The Contra Costa Times)
