The terms underground storage tanks, USTs, and UST systems include underground storage tank vessels, and the connected underground piping. Thus, above-ground tanks with extensive underground piping may also be regulated under RCRA Subtitle I. Usually associated with gasoline service stations, these tanks are also used to store materials that are classified as hazardous due to flammability or combustibility. Leaking underground storage tanks can cause fires or explosions or contaminate groundwater, threatening public health and the environment.
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