In this Sept. 21, 2017, photo, a sign on a door of the Environmental Protection Agency in Washington. The EPA says it has recovered 517 containers of “unidentified, potentially hazardous material” from highly contaminated toxic waste sites in Texas that flooded last month during Hurricane Harvey. But the agency has not provided details about which Superfund sites the material came from, why the contaminants at issue have not been identified and whether there’s a threat to human health. (AP Photo/Pablo Martinez Monsivais)
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