| http://www.w3.org/ns/prov#value | - Coal ash contains arsenic, lead, mercury and other toxic metals.Duke has described the pumping as routine maintenance at the old coal-fired power plant, which shut down in 2012.The new probe comes as a federal grand jury is convening in Raleigh on Tuesday as part of a criminal investigation triggered by the massive Feb. 2 spill from a Duke coal ash dump in Eden that coated 70 miles of the Dan Ri
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