More than 90 percent of U.S. coal-fired power plants that are required to monitor groundwater near their coal ash dumps show unsafe levels of toxic metals, according to a study released on Monday by environmental groups, which cited the potential harm to drinking water. The groups, led by the Environmental Integrity Project and Earthjustice, said their findings show that stronger regulations are needed for coal ash. Data made public by power companies showed that of the 265 plants subject to the monitoring requirement, 241 – or 91 percent – showed unsafe levels of one or more […]