FILE- In this June 26, 2015 file photo, trucks haul coal ash from one retention pond to a permanent pond at the Dominion Power's Possum Point Power Station in Dumfries, Va. Major utilities are finding evidence of groundwater contamination at coal-burning power plants across the U.S. where landfills and man-made ponds have been used for decades as dumping grounds for coal ash. Data the utilities must publish by Friday, March 2, 2018, show heightened levels of arsenic, radium and other hazardous materials have been found at plants in numerous states, from Virginia and North Carolina to Montana and Alaska. (AP Photo/Steve Helber, File)
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