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 outside Silverton, Colo. The U.S. Environmental Protection Agency is asking a federal court in New Mexico to toss out a lawsuit over a mine waste spill in Colorado that polluted rivers in three states. (AP Photo/Brennan Linsley, File)
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