Indiana Code Title 13. Environment § 13-11-2-241

(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.

(1) a single tank;  or

(2) a combination of tanks;

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

(2) in which there are separate compartments.

(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:

(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:

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).