They built an incinerator to burn the hazardous material removed from Weldon Springs and, I think, Times Beach. Don't know if it is still operational. There were complaints but no protests as far as I know.
It must have done the job since both locations are now public parks.
If you go to a Save-A-Lot grocery round these parts (East Central Missouri) you can buy a can of Axis scouring powder (with bleach!).