It was an accident, but I think it can be really bad for the local water table unless your soil types and underground water flows happen to be "favorable". I have a copy somewhere of a calculation made by a very respected scientist/customer of our's who worked for DuPont. Based on reliable data and assumptions, he showed how even one quart of spilled oil develops into a very very thin layer slick that spreads out over the local water table and even at the very low levels that would be realistically expected it will pollute the local water for anyone who has a well in the area. I'm not sure what you can do about it other than call local EPA "annonymously" and ask if it's something to be concerned about.
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