California occupational safety investigators have begun an investigation into Marathon's refinery following a Feb. 25 fire.
The fiery Feb. 6 train derailment spilled 7,500 barrels of crude in Saskatchewan.
An investigation revealed that the production area had only one door.
Exposure to hexavalent chromium can result in significant adverse health effects.
The action comes after Brian Maldonado, 25, of San Diego, Texas, died Saturday at the Dell Seton Medical Center in Austin where he underwent surgery after the blast.
The 19 violations could mean a potential fine of $211,768.
Accident killed fire workers in one of the worst drilling accidents in a decade.
Company cited for workplace safety and health hazards at its Delair foundry.
The PES facility was extensively damaged by fire and an explosion in June.
A polyethylene unit was behind schedule to become operational.
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