Roughly two barrels of an oil and water mixture leaked into the Bay near the Shell refinery in Martinez on Tuesday, company officials said.
Around 4 p.m., Shell employees reported a leak of an oil and water mixture from a crude oil line at the Shell Martinez wharf.
Shell officials said the leak appeared to have been the result of a test being conducted on the line. They said the leak was contained within 30 minutes.
Shell officials estimated that approximately two barrels of oil -- or about 84 gallons -- leaked into the water.
Company employees deployed absorbent boom and skimmer boats to contain and recover the oil, Shell officials said.