Tesoro should have informed regulators that a pipeline it operates in North Dakota had problems before it spilled more than 20,000 barrels of oil on a farm in the state, according to a federal official. Tesoro had the integrity of its pipeline tested about two weeks before the incident. "It is completely unacceptable that a company would have a release of this size and not know it. It's just unconscionable. And the question is, how did that possibly occur?" said Linda Daugherty, deputy associate administrator for the Pipeline and Hazardous Materials Safety Administration.
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