As used in this part:

    (a) "Department" means the department of natural resources, underground storage tank division.

    (b) "Fund" means the underground storage tank regulatory enforcement fund created in section 21104.

    (c) "Local unit of government" means a municipality, county, or governmental authority or any combination of municipalities, counties, or governmental authorities.

    (d) "Natural gas" means natural gas, synthetic gas, and manufactured gas.

    (e) "Operator" means a person who is presently, or was at the time of a release, in control of or responsible for the operation of an underground storage tank system.

    (f) "Owner" means a person who holds, or at the time of a release who held, a legal, equitable, or possessory interest of any kind in an underground storage tank system or in the property on which an underground storage tank system is located, including, but not limited to, a trust, vendor, vendee, lessor, or lessee. However, owner does not include a person or a regulated financial institution who, without participating in the management of an underground storage tank system and who is not otherwise engaged in petroleum production, refining, or marketing relating to the underground storage tank system, is acting in a fiduciary capacity or who holds indicia of ownership primarily to protect the person's or the regulated financial institution's security interest in the underground storage tank system or the property on which it is located. This exclusion does not apply to a grantor, beneficiary, remainderman, or other person who could directly or indirectly benefit financially from the exclusion other than by the receipt of payment for fees and expenses related to the administration of a trust.

    (g) "Regulated substance" means any of the following:

    (i) A substance defined in section 101(14) of title I of the comprehensive environmental response, compensation, and liability act of 1980, Public Law 96-510, 42 U.S.C. 9601, but not including a substance regulated as a hazardous waste under subtitle C of the solid waste disposal act, title II of Public Law 89-272, 42 U.S.C. 6921 to 6931 and 6933 to 6939b.

    (ii) Petroleum, including crude oil or any fraction of crude oil that is liquid at standard conditions of temperature and pressure (60 degrees Fahrenheit and 14.7 pounds per square inch absolute). Petroleum includes but is not limited to mixtures of petroleum with de minimis quantities of other regulated substances, and petroleum-based substances composed of a complex blend of hydrocarbons derived from crude oil through processes of separation, conversion, upgrading, or finishing such as motor fuels, jet fuels, distillate fuel oils, residual fuel oils, lubricants, and petroleum solvents.

    (iii) A substance listed in section 112 of part A of title I of the clean air act, chapter 360, 84 Stat. 1685, 42 U.S.C. 7412.

    (h) "Release" means any spilling, leaking, emitting, discharging, escaping, leaching, or disposing from an underground storage tank system into groundwater, surface water, or subsurface soils.

    (i) "Underground storage tank system" means a tank or combination of tanks, including underground pipes connected to the tank or tanks, which is, was, or may have been used to contain an accumulation of regulated substances, and the volume of which, including the volume of the underground pipes connected to the tank or tanks, is 10% or more beneath the surface of the ground. An underground storage tank system does not include any of the following:

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

    (ii) A tank used for storing heating oil for consumptive use on the premises where the tank is located.

    (iii) A septic tank.

    (iv) A pipeline facility, including gathering lines regulated under either of the following:

    (A) The natural gas pipeline safety act of 1968, Public Law 90-481, 49 U.S.C. Appx 1671 to 1677, 1679a to 1682, and 1683 to 1687.

    (B) Sections 201 to 215 and 217 of the hazardous liquid pipeline safety act of 1979, title II of Public Law 96-129, 49 U.S.C. Appx 2001 to 2015.

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

    (vi) A storm water or wastewater collection system.

    (vii) A flow-through process tank.

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

    (ix) A 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.

    (x) Any pipes connected to a tank that is described in subparagraphs (i) to (xvi).

    (xi) An underground storage tank system holding hazardous wastes listed or identified under subtitle C of the solid waste disposal act, title II of Public Law 89-272, 42 U.S.C. 6921 to 6931 and 6933 to 6939b, or a mixture of such hazardous waste and other regulated substances.

    (xii) A wastewater treatment tank system that is part of a wastewater treatment facility regulated under section 307(b) of title III or section 402 of title IV of the federal water pollution control act, 33 U.S.C. 1317 and 1342.

    (xiii) Equipment or machinery that contains regulated substances for operational purposes such as hydraulic lift tanks and electrical equipment tanks.

    (xiv) An underground storage tank system with a capacity of 110 gallons or less.

    (xv) An underground storage tank system that contains a de minimis concentration of regulated substances.

    (xvi) An emergency spill or overflow containment underground storage tank system that is expeditiously emptied after use.