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The Associated Press
Minneapolis

DNR: Wisconsin frack sand sludge spill nontoxic

Sludge from the Hi-Crush mine is seen in the Trempealeau River.
In this May 22, 2018 photo, sludge from the Hi-Crush mine in Whitehall, Wis. is seen in the Trempealeau River near Dodge, Wis.
Peter Thomson | La Crosse Tribune via AP File

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