Debate over the clean-up of the February coal ash spill that dumped nearly 39,000 tons of potentially toxic waste in the Dan River last February continues. The full effects on tourism and agriculture are not fully known and environmentalists continue to debate the best methods of clean-up. At the same time, a federal investigate examines the relationship between Duke Energy and the Department of Environment and Natural Resources. Host Frank Stasio talks with WUNC's Greensboro Bureau chief Jeff Tiberii about the latest.