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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. On Wednesday, March 13, 2019, the Environmental Protection Agency set three long-term goals for cleaning up the Bonita Peak Mining District Superfund site, which includes the Gold King. The goals are improving water quality in streams, stabilizing mine waste piles to keep more pollution from leaching into waterways and preventing big releases of tainted water from mine shafts. (AP Photo/Brennan Linsley, File)

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. On Wednesday, March 13, 2019, the Environmental Protection Agency set three long-term goals for cleaning up the Bonita Peak Mining District Superfund site, which includes the Gold King. The goals are improving water quality in streams, stabilizing mine waste piles to keep more pollution from leaching into waterways and preventing big releases of tainted water from mine shafts. (AP Photo/Brennan Linsley, File)

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