FILE — This Dec. 22, 2008, file photo shows the aftermath of a retention pond wall collapse at the TVA Kingston Fossil Plant in Harriman, Tenn. A grand jury in Tennessee's Roane County is supporting a criminal investigation into claims that a Tennessee Valley Authority contractor failed to protect workers cleaning up a massive coal ash spill. The grand jury report alludes to the workers' claims that air monitoring results and other environmental tests were tampered with by supervisors with contractor Jacobs Engineering. (AP Photo/Wade Payne, File)
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