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Oil started leaking at the site of a Chevron appraisal well Nov. 7, about 230 miles (370 kilometers) off the northeastern coast of Rio de Janeiro state. George Buck, chief operating officer for Chevron's Brazilian division, has said the spill occurred because Chevron underestimated the pressure in an underwater reservoir. He said in late November that this caused crude oil to rush up a bore hole and eventually escape into the surrounding seabed. The oil leaked out through at least seven narrow fissures on the ocean floor, all within 160 feet (50 meters) of the wellhead. Both Chevron and Brazilian officials said in late November that the leak was under control, although some residual oil continues to seep from the site of the leak. The work at the Frade field where the leak occurred is one of Chevron's biggest capital investments, according to the company's website, though details are not provided.
[Associated
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