you can be held liable for contamantion if you remove yourself, no matter how much water you spray
then you have to pay for the clean up of the surronding houses, scraping top soil offm cleaning homes, testing for contamantion, disposal of contaminated soil ect ect ect
there are laywers that specialize in this, you homeownersinsurance not cover you and unless you got a million in cash laying around, youll loose you home