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FILE PHOTO: The Suncor refinery is reflected in a puddle on Friday, Dec. 30, in Commerce City, Colo. (Timothy Hurst/The Denver Gazette)

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Environmental Protection Agency's Gladstone mine waste filtration plant along Cement Creek above Silverton, Colo. The plant, built in 2015 on …

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Water treatment operator Preston Kidwell tests the water at the recently opened mitigation facility for Security Water and Sanitation District…