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This July 27, 2017, photo shows a U.S. Environmental Protection Agency wastewater treatment plant in the San Juan Mountains outside Silverton, Colo. The plant treats water flowing from the Gold King Mine, where the EPA inadvertently triggered a spill of 3 million gallons of wastewater in 2015. The EPA is installing a barrier and valve inside the mine to regulate the flow of wastewater.(AP Photo/Dan Elliot)

This July 27, 2017, photo shows a U.S. Environmental Protection Agency wastewater treatment plant in the San Juan Mountains outside Silverton, Colo. The plant treats water flowing from the Gold King Mine, where the EPA inadvertently triggered a spill of 3 million gallons of wastewater in 2015. The EPA is installing a barrier and valve inside the mine to regulate the flow of wastewater.(AP Photo/Dan Elliot)

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