This is the largest Keystone oil spill to date in South Dakota, Walsh said. The leak comes just days before Nebraska officials announce a decision on whether the proposed Keystone XL Pipeline, a sister project, can move forward.
In April 2016, there was a 400-barrel release — or 16,800 gallons — with the majority of the oil cleanup completed in two months, Walsh said.
“It is a below-ground pipeline but some oil has surfaced above ground to the grass,” Walsh said. “It will be a few days until they can excavate and get in borings to see if there is groundwater contamination.”
There were no initial reports of the oil spill affecting waterways, water systems or wildlife, he said.
TransCanada said it was working with state and federal agencies.
“The safety of the public and environment are our top priorities and we will continue to provide updates as they become available,” …
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