For purposes of this chapter, unless the context otherwise requires:

1. "Commercial facility" means all contiguous land, structures, appurtenances, and improvements on the land used for treatment and disposal of hazardous waste received from offsite generators.

2. "Department" means the department of environmental quality.

3. "Disposal" means the discharge, deposit, injection, dumping, spilling, leaking, or placing of any solid waste or hazardous waste into or on any land or water so the solid waste or hazardous waste or any hazardous constituent of the waste may enter the environment or be emitted into the air or discharged into any waters, including ground water.

4. "Facility" means all contiguous land and structures, other appurtenances, and improvements on the land, used for treating, storing, or disposing of hazardous waste. A facility may consist of several contiguous treatment, storage, or disposal operational units.

5. "Generator" means any person, by site, through act or process produces hazardous waste or first causes a hazardous waste to become subject to regulation.

6. "Hazardous waste" means any waste or combination of wastes of a solid, liquid, contained gaseous, or semisolid form that: a. Because of its quantity, concentration, or physical, chemical, or other characteristic, in the judgment of the department may: (1) Cause, or significantly contribute to, an increase in mortality or an increase in serious irreversible or incapacitating reversible illness; or (2) Pose a substantial present or potential hazard to human health or the environment when improperly treated, stored, disposed of, or otherwise managed; or b. Is identified by the mechanisms established in this chapter, including those that exhibit extraction procedure toxicity, corrosivity, ignitability, or reactivity.

7. "Hazardous waste management" means the systematic control of the collection, source separation, storage, transportation, processing, treatment, recovery, and disposal of hazardous waste.

8. "Manifest" means the document used for identifying the quantity, composition, origin, routing, and destination of hazardous waste during transportation from the site of generation to the site of storage, treatment, or disposal.

9. "Owner" means, in the case of an underground storage tank: a. In use after November 7, 1984, any person that owns or operates an underground storage tank used for the storage, use, or dispensing of regulated substances.

1. b. In use before November 8, 1984, but no longer in use after that date, any person that owned or operated such a tank immediately before the discontinuation of the tank's use.10. 'Regulated substance' means:- a. Any substance defined in section 101(14) of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 [42 U.S.C. 9601 et seq.], as amended, but not including any substance regulated as a hazardous waste under subtitle C of the Resource Conservation and Recovery Act [42 U.S.C. 6901 et seq.], as amended.
2. b. Petroleum, including crude oil or any fraction of crude oil that is liquid at standard conditions of temperature and pressure (sixty degrees Fahrenheit [16 degrees Celsius] and fourteen and seven-tenths pounds per square inch [101.35 kilopascal] absolute).11. 'Release' means any spilling, leaking, emitting, discharging, escaping, leaching, or disposing from an underground storage tank into ground water, surface water, or subsurface soils.12. 'Storage' means the holding of hazardous waste at a site for a temporary period, at the end of which the hazardous waste is treated, disposed of, or transported and retained elsewhere.13. 'Transportation' means the offsite movement of hazardous wastes to any intermediate site or to any site of storage, treatment, or disposal.14. 'Treatment' means any method, technique, or process, including neutralization, designed to change the physical, chemical, or biological character or composition of any hazardous waste to neutralize the waste, to recover energy or material resources from the waste, or to render the waste nonhazardous or less hazardous; safer to transport, store, or dispose of; or amenable for recovery, amenable for storage, or reduced in volume.15. 'Treatment, storage, or disposal facility' means a location at which hazardous waste is subjected to treatment, storage, or disposal, and may include a facility at which hazardous waste has been generated.16. 'Underground storage tank' means any one or combination of underground tanks, including underground pipes connected to an underground tank, used to contain an accumulation of regulated substances, and the volume of which, including the volume of the underground pipes connected to it, is ten percent or more beneath the surface of the ground. Exemptions from this definition and rules adopted under this chapter include:- a. Farm or residential tanks of one thousand one hundred gallons [4163.94 liters] or less capacity used for storing motor fuel for noncommercial purposes.
3. b. Tanks used for storing heating oil for consumptive use on the premises where stored.
4. c. Septic tanks.
5. d. A pipeline facility, including gathering lines, regulated under:
6. (1) The Natural Gas Pipeline Safety Act of 1968 [Pub. L. 90-481].
7. (2) The Hazardous Liquid Pipeline Safety Act of 1979 [Pub. L. 96-129, 49 U.S.C. 60101 et seq.].
8. (3) An interstate pipeline facility regulated under state laws comparable to the provisions of law in paragraph 1 or 2.
9. e. Surface impoundments, pits, ponds, or lagoons.
10. f. Storm water or wastewater collection systems.
11. g. Flow-through process tanks.
12. h. Liquid traps or associated gathering lines directly related to oil or gas production and gathering operations.
13. i. Storage tanks situated in an underground area such as a basement, cellar, mine working, drift, shaft, or tunnel if the storage tank is situated on or above the surface of the floor.

17. "Waste" means any garbage, refuse, sludge from a waste treatment plant, water supply treatment plant, or air pollution control facility; and other discarded material, including solid, liquid, semisolid, or contained gaseous material resulting from commercial, industrial, or other chemical, biological, or physical activities. It does not include solid or dissolved material in domestic sewage or solid or dissolved material in irrigation return flows or industrial discharges, which are point sources subject to permits under section 402 of the Federal Clean Water Act [Pub. L. 95-217; 22 U.S.C. 1251 et seq.], as amended, or source, special nuclear, or byproduct material as defined by the Atomic Energy Act of 1954 [Pub. L. 83-703; 42 U.S.C. 2011 et seq.], as amended, or to coal mining wastes or overburden for which a surface coal mining and reclamation permit is issued or approved under the Surface Mining Control and Reclamation Act of 1977 [Pub. L. 95-87; 30 U.S.C. 1201 et seq.].