What are the dangers posed by underground fuel tanks?

What are the dangers posed by underground fuel tanks?

Terry Tamminen (Author & Environmental Policy Advisor) gives expert video advice on: Why do gas stations have three different grades of gas?; Does higher-octane gasoline make my car run more efficiently?; What are "benzene", "toluene", "ethylbenzene" and "xylene" (BTEX compounds)? and more...

Underground fuel tanks, especially at gas stations, leak, and they pose great hazards to our surrounding communities and to the water supply. In California, there are several hundred thousand leaking underground fuel tanks, mostly at the retail gasoline outlets -- gas stations. And in many cases, the gasoline has leaked from the underground fuel tank into the water supply. When you pump water out of a well, you're in many cases also pumping out the gasoline that has leaked form underground fuel tanks, and has very toxic compounds in it.