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FILE - In this Aug. 14, 2015 file photo, water flows through a series of sediment retention ponds built to reduce heavy metal and chemical contaminants from the Gold King Mine wastewater accident, in the spillway about 1/4 mile downstream from the mine, outside Silverton, Colo. Southwestern Colorado residents told Congress Thursday, Oct. 1, 2015 that the Gold King Mine blowout and other mines spilling acid waste into waterways could cause serious long-term damage to their tourism economy, but they disagreed on whether a federal Superfund designation would help or hurt. (AP Photo/Brennan Linsley, file)

FILE - In this Aug. 14, 2015 file photo, water flows through a series of sediment retention ponds built to reduce heavy metal and chemical contaminants from the Gold King Mine wastewater accident, in the spillway about 1/4 mile downstream from the mine, outside Silverton, Colo. Southwestern Colorado residents told Congress Thursday, Oct. 1, 2015 that the Gold King Mine blowout and other mines spilling acid waste into waterways could cause serious long-term damage to their tourism economy, but they disagreed on whether a federal Superfund designation would help or hurt. (AP Photo/Brennan Linsley, file)

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