Here in Germany we used a salt mine to dispose of our nuclear waste, which backfired, to say the least. [1]
How big the eventual costs (the article speaks of "at least €4 billion ($5.3 billion), but more likely somewhere between €5 billion and €10 billion") will be is uncertain, and I can't back this up by any real evidence, but my guess is that those who profited from the waste disposal might not be the ones paying for the clean-up.
This all makes me think of the Futurama episode "A Big Piece of Garbage" [2]:
>The others quickly dismiss Leela's concerns that the new garbage ball will return and destroy a future generation. Professor Farnsworth replies that it will not be for hundreds of years, presumably by the year 4000, prompting Fry to say "That's the 20th Century spirit!"
[1]http://www.spiegel.de/international/germany/germany-weighs-o...