I certainly hope anyone professing to speak intelligently on nuclear power would have a strong grasp of Hanford, and not just the more well-known sites at Three Mile Island, Chernobyl and Fukushima. Hanford has worse contamination by far, with some 53 million gallons of liquid waste heavily contaminating the soil over several hundred square miles and severely endangering the largest river west of the Rockies (the Columbia river). It is hard to get a grasp on scale sometimes, but the EPA estimates 475 billion gallons of groundwater have been contaminated beyond acceptable standards; this is, by comparison for a sense of scale, more than fifteen times the maximum capacity of the United States Strategic Petroleum Reserve (~30.5 billion gallons).
There are a number of sources cited for Hanford at
http://en.wikipedia.org/wiki/Hanford_Site#Environmental_concerns
There's also this, which predated some of the more recent findings I remember from the news that I admit to having trouble finding online - "Department of Energy: Preliminary Information on the Potential for
Columbia River Contamination from the Hanford Site" - Government Accountability Office - 4 November 2005:
http://www.gao.gov/assets/100/93848.pdf ... I know the 80 square mile estimate was updated a few years ago to somewhere in the 200 to 300 square mile range, but I can't find an online source to corroborate (for some reason my Internet has been uber-slow, google searches keep timing out which doesn't help :/).
There have been many promises, over the decades, of addressing the problems and dealing with it, but as of 2012, the spreading contamination is not even close to being contained and cleaned up.