While many types of storage tanks may be buried underground, the term “underground storage tank” refers specifically to certain types of tanks that are regulated under the federal Resource Conservation and Recovery Act. These tanks are buried at least 10% underground and store either petroleum products (e.g., gasoline, diesel, kerosene, jet fuel) or certain hazardous substances. The underground piping connected to the tanks is also considered part of the UST. USTs are most often found at gas stations and other fueling facilities. If an UST develops a leak, its contents can migrate through the soil and reach ground water.