White smoke rises from the Chevron refinery during a controlled burn on Tuesday, Aug. 6, 2012, the morning after Monday’s toxic fire in Richmond,
White smoke rises from the Chevron refinery during a controlled burn on Tuesday, Aug. 6, 2012, the morning after Monday's toxic fire in Richmond, Calif. An investigation into what caused the fire is ongoing.. Heather Kulp, Chevron spokesperson, said the fire was caused by a vapor leak. (Laura A. Oda/Staff) ( Laura A. Oda )