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 downstream from the mine, outside Silverton, Colo. The massive mine waste spill in southwestern Colorado contributed to water quality problems for up to nine months, the Environmental Protection Agency said Friday, Jan. 6, 2017. Contamination from the August 2015 spill at the Gold King Mine may also have caused pollution problems last year when annual spring snowmelt swelled rivers. (AP Photo/Brennan Linsley, file)
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