Pretty scary if you ask me. Just throw some fresh dirt over it and if grass grows don't worry about. If it all Loss rock it would have went down to original grade of material and speard from there and the fumes or hydrocarbons rise from there. They do say if you can smell gas when your filling up your vehicle you have been exposed to to many benzine's. Benzine's are very carcinogenic, I feel sorry for all the home owners who have to live with the smell.
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