Pipeline company TransCanada said about 400 barrels of oil leaked near the Keystone pipeline in South Dakota, far more than the company originally estimated. The company started the process of closing down its Keystone oil pipeline after discovering oil released Saturday near a pump station in South Dakota. Initial estimates put the size of the release at about 125 barrels. “We have completed our initial modeling and have provided to regulators an estimate of the potential volume of 400 barrels,” the company said in an emailed statement. The company maintained there were no threats from the release to the environment or to public health. A spokesperson said Monday the size of visible oil at […]