The controversial Dakota Access Pipeline sprung a small leak about 200 miles south of where the well-reported Standing Rock protests took place, NBC News reported.
About 84 gallons leaked from a tank inside a pump station located in the small rural town of Tulare. The leak was contained inside an area made of gravel and synthetic liner, and any contaminated gravel was stored for proper disposal, according to officials.
The leak happened more than a month ago on April 4 but wasn't noticed until Tuesday because of its small size.
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Brian Walsh, an environment official in South Dakota, said the pump had a mechanical failure and that the pipeline company has done everything by the book so far.