Oof, that's pretty bad. I did not know that. Do you happen to know if forests would help clean that soil?
Feels kind of appropriate if you could grow forest on a site for 50 to 100 years or more. Then harvest the wood with all the nasty stuff in it. Then bury all that contaminated wood somewhere deep. Then build houses on the newly clean earth.
You can build new soil on top of contaminated soil to bury it. Here’s a permaculture site in an old rail bed in nyc that has nasty stuff lurking beneath many layers of new soil[0].
