(a) Regulated substances under this subchapter include:
(1) a substance defined in Section 101(14) of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (42 U.S.C. § 9601 et seq.), but does not include a substance regulated as a hazardous waste under the federal Solid Waste Disposal Act (42 U.S.C. § 6921 et seq.);
(2) petroleum, including crude oil or a fraction of it, that is liquid at standard conditions of temperature and pressure; and
(3) any other substance designated by the commission.
(b) Standard conditions of temperature and pressure under Subdivision (2) of Subsection (a) of this section are 60 degrees Fahrenheit and 14.7 pounds per square inch absolute.