underground storage tank — Law Dictionary

42 U.S.C. § 6991B — under this subchapter (6 versions over time)

The term “underground storage tank” has the meaning given to it in section 6991 of this title, except that such term does not include tank combinations or more than a single underground pipe connected to a tank.

42 U.S.C. § 6991 — in this subchapter (6 versions over time)

The term “underground storage tank” means any one or combination of tanks (including underground pipes connected thereto) which is used to contain an accumulation of regulated substances, and the volume of which (including the volume of the underground pipes connected thereto) is 10 per centum or more beneath the surface of the ground. Such term does not include any—

(A) farm or residential tank of 1,100 gallons or less capacity used for storing motor fuel for noncommercial purposes,

(B) tank used for storing heating oil for consumptive use on the premises where stored,

(C) septic tank,

(D) pipeline facility (including gathering lines)—

(i) which is regulated under chapter 601 of title 49, or

(ii) which is an intrastate pipeline facility regulated under State laws as provided in chapter 601 of title 49,

(E) surface impoundment, pit, pond, or lagoon,

(F) storm water or waste water collection system,

(G) flow-through process tank,

(H) liquid trap or associated gathering lines directly related to oil or gas production and gathering operations, or

(I) storage tank situated in an underground area (such as a basement, cellar, mineworking, drift, shaft, or tunnel) if the storage tank is situated upon or above the surface of the floor.