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At the neighboring Amuay refinery, only one of its five distillation plants and the catalytic cracker - key for making gasoline - were working, two separate sources said.

The refinery is set to restart operations in the fluid catalytic cracker unit between 7 p.m.

Investigators concluded the Feb. 18, 2015, explosion was the result of a hydrocarbon release from the fluid catalytic cracker unit into the electrostatic precipitator — a filtration device that removes fine particulates.

The fluid catalytic cracker unit refines gasoline and is crucial to producing California-grade fuel.

Cal/OSHA found that the fluid catalytic cracker unit was not working properly for nine years.