| http://www.w3.org/ns/prov#value | - That damage would have been reduced by about two-thirds if controllers in Houston isolated the rupture as soon as problems emerged, investigators said.Instead, as Exxon personnel weighed the appropriate response, crude drained from the severed, 12-inch pipeline for another 46 minutes before a control valve was finally closed.Exxon spent $135 million on its response to the spill, including cleanup
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