Yesterday, a total of 210,000 gallons (795,000 liters) of oil leaked from the Keystone pipeline in South Dakota, the pipeline's operator, TransCanada, said.
Crews shut down the pipeline Thursday morning and officials are investigating the cause of the leak.
This is the largest Keystone oil spill to date in South Dakota. The leak comes just days before Nebraska officials announce a decision on whether the proposed Keystone XL Pipeline, a sister project, can move forward.
A representative of the State environmental office said "It is a below-ground pipeline but some oil has surfaced above ground to the grass. It will be a few days until they can excavate and get in borings to see if there is groundwater contamination."
Environmental groups, Native American tribes and local farmers opposed the original pipeline and the proposed extension (Keystone XL). They have cited this spill as evidence of the risks.
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