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 1/4 mile downstream from the mine, outside Silverton, Colo. Researchers who studied a river in Colorado after a massive mine spill say runoff from fall storms kicked up the levels of some contaminants in the water but not others. (AP Photo/Brennan Linsley, File)
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