You asked about a "legal" solution which I don't have. However the solution to disposing of the 20 year old "gas" that was in Sweetie was to kill the weeds growing in my drive. I won't do that again because my whole property smelled like the devil's armpit for weeks afterward.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.