San Ramon-based Chevron Corp. spilled between three and five tons of molten sulfur from a pipeline in Pascagoula, Miss., while transferring the sulfur to a barge, according to the Mississippi Emergency Management Agency. An equipment failure occurred while preparing "the line to transfer the product to a barge" according to a report filed with the agency. Steve Renfroe, a spokesman for Chevron's Pascagoula refinery, did not immediately return a telephone call seeking comment. The plant has a capacity of 330,000 barrels a day, according to data compiled by Bloomberg.