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In this Aug. 12, 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. Internal documents released by the U.S. Environmental Protection Agency on Friday, Aug. 21, show managers at the EPA were aware of the potential for a catastrophic "blowout" at an abandoned mine that could release "large volumes" of wastewater laced with toxic heavy metals. (AP Photo/Brennan Linsley, File)

In this Aug. 12, 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. Internal documents released by the U.S. Environmental Protection Agency on Friday, Aug. 21, show managers at the EPA were aware of the potential for a catastrophic "blowout" at an abandoned mine that could release "large volumes" of wastewater laced with toxic heavy metals. (AP Photo/Brennan Linsley, File)

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