Sec. 241. (a) “Underground storage tank” (or UST), for purposes of this chapter and IC 13-23, means one (1) tank or a combination of tanks:

(1) that is used to contain an accumulation of regulated substances; and

(2) the volume of which, including the volume of the underground connected pipes described in subsection (b), is at least ten percent (10%) beneath the surface of the ground.

     (b) If:

(1) a single tank; or

(2) a combination of tanks;

constitutes an underground storage tank under subsection (a), any underground pipes that are connected to the single tank or combination of tanks are also part of the underground storage tank.

     (c) The term defined in subsection (a) includes a single tank:

(1) that meets the definition set forth in subsection (a); and

(2) in which there are separate compartments.

     (d) The term does not include any of the following:

(1) A farm or residential tank with a capacity of not more than one thousand one hundred (1,100) gallons that is used for storing motor fuel for noncommercial purposes.

(2) A tank used for storing heating oil for consumptive use on the premises on which the tank is stored.

(3) A septic tank.

(4) A pipeline facility, including gathering lines, that:

(A) is regulated under the Pipeline Safety Act (49 U.S.C. § 60101 et seq.); or

(B) is an intrastate pipeline facility regulated under state laws comparable to the laws identified in clause (A).

(5) A surface impoundment, pit, pond, or lagoon.

(6) A storm water or wastewater collection system.

(7) A flow-through process tank.

(8) A liquid trap or associated gathering lines directly related to oil or gas production and gathering operations.

(9) A storage tank situated in an underground area such as:

(A) a basement;

(B) a cellar;

(C) a mineworking;

(D) a drift;

(E) a shaft; or

(F) a tunnel;

if the storage tank is situated upon or above the surface of the floor.

(10) Any other tank exempted by a rule adopted by the board in accordance with regulations adopted by the Administrator of the United States Environmental Protection Agency.

(11) A pipe connected to a tank described in subdivisions (1) through (10).

[Pre-1996 Recodification Citations: 13-7-20-11; 13-7-20.1-5 part.]

As added by P.L.1-1996, SEC.1. Amended by P.L.6-2014, SEC.1; P.L.113-2014, SEC.61; P.L.96-2016, SEC.9; P.L.176-2023, SEC.30.