I found a fascinating youtube channel of the Hanford Site (source of a lot of the US nuclear material and other things):
https://www.youtube.com/user/HanfordSite/videosSince a lot of the stuff was done in a hurry and for the military, it seems that the eventual need to clean up was not exactly a high priority on the designers mind.
Some of the videos are really fascinating and give you a glimpse as to what working there was like and what sorts of operations were done.