In a statement just released by Chevron officials, they say, "The refinery has conducted a thorough check of its wharf operations and does not believe it is a source of the material. Chevron is working with the ship operator to consider other potential sources."
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The spill was "quickly boomed by our emergency response team," according to a statement from Chevron.
"This morning around 6:30 a.m., a soot-like material was identified in the water between a berthed ship and our long wharf," Chevron officials said in a written statement. "The material is contained and we are investigating the source."
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Chevron officials did not say how much of the material was spilled or what they think it is.
Contra Costa Supervisor John Gioia first reported the spill of a "black solid substance" via Twitter at about 9:20 a.m.
The Bay City News contributed to this report.