In this July 9, 2014, file photo, a sign informs visitors of prohibited items on the Hanford Nuclear Reservation near Richland, Wash. The U.S. Environmental Protection Agency is fining another federal agency up to $10,000 for each week it fails to start moving radioactive sludge away from the Columbia River at the most contaminated nuclear site in the U.S. The Tri-Party Agreement required the U.S. Department of Energy to begin removing sludge from a storage basin at the Hanford Nuclear Reservation. (AP Photo/Ted S. Warren, File)
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