The Valero refinery in Benicia refines about 165,000 barrels of oil a day.
When it comes to oil production, California is no Texas. But the Golden State is actually number three among states extracting crude oil from the ground.
Now the nation's largest refiner of oil wants to start using trains to bring that crude oil to its refinery in the San Francisco Bay Area. That's raising concerns about safety and air pollution in the East Bay city of Benicia.
KQED Science reporter Molly Samuel has the story.