In this Jan. 25, 2017 photo, Richard Lawson heat welds sections of pipe together that will move water between ash storage ponds at Gallatin Fossil Plant in Gallatin, Tenn. Environmental groups are taking the Tennessee Valley Authority, the nation's largest public utility, to trial over whether waste from the coal-fired power plant near Nashville polluted the Cumberland River. A trial opens Monday, Jan. 30, in federal court in Nashville as the groups claim coal ash waste illegally seeped into the Cumberland River. (AP Photo/Mark Humphrey)
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