RICHLAND, Wash. – At the Hanford Nuclear Reservation in southeast Washington, the race is on to clean up radioactive sludge buried in aging underground tanks. Some of that waste has already leaked into the soil not far from the Columbia River. But attempts to use high-tech robotics to hose out waste tanks haven't gone as planned. And an important federal cleanup deadline is fast approaching. Correspondent Anna King visited one Hanford tank farm to see what’s causing the delays.