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In this Aug. 14, 2015, file photo, water flows through a series of retention ponds built to contain and filter out heavy metals and chemicals from the Gold King mine chemical accident, in the spillway about a quarter mile downstream from the mine, outside Silverton, Colo. (AP Photo/Brennan Linsley, File)

In this Aug. 14, 2015, file photo, water flows through a series of retention ponds built to contain and filter out heavy metals and chemicals from the Gold King mine chemical accident, in the spillway about a quarter mile downstream from the mine, outside Silverton, Colo. (AP Photo/Brennan Linsley, File)

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