I see lots of comments trying to shift the blame from the administration that originally dumped the chemicals in what was at the time countryside.
Funnily not a lot of them highlighting the fact that dumping toxic waste, wherever it might be, is just plain BAD. And this is a textbook case: you might never know what will happen there in 50 years, let alone 500.
Food for thought for nuclear waste dumps...
Was it the american indians that encouraged to think about the consequences of one's actions for seven generations?