Associated Press: The U.S. Environmental Protection Agency will oversee the cleanup of a massive coal ash spill in Tennessee that brought national attention to the environmental risks of storing the power plant byproduct. New EPA Administrator Lisa Jackson said Monday the federal agency is taking charge and “bringing to bear its resources and expertise” under the federal Superfund law. So far, the EPA has been assisting state regulators with the cleanup of 5.4 million cubic yards of coal ash …