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. A temporary treatment plant, not pictured, has begun cleaning up polluted water flowing from the Gold King Mine in southwestern Colorado after an accident sent millions of gallons of waste into rivers in three states. The Environmental Protection Agency said Monday, Oct. 19, 2015 that the $1.8 million plant is processing up to 800 gallons per minute, including water flowing from the mine and water stored in ponds. (AP Photo/Brennan Linsley, file)

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