"Hazardous substance operation" shall mean the manufacture, formulation, mixing, or transfer from one container to another of any substance or product set forth in the most current Director's List of Hazardous Substances developed by the Director of Industrial Relations of the State for which the manufacturer or producer is required to prepare a Material Safety Data Sheet of the substance or product pursuant to the Hazardous Substances Information and Training Act (Chapter 2.5 of Part 1 of Division 5 of the Labor Code of the State, commencing with Section 6360); provided, however, quantities of less than 500 pounds, fifty-five (55) gallons, or 200 cubic feet in the gaseous state during any thirty (30) day period shall not be included unless the Health Officer has provided notice that he has lowered the weight or volume limits of this exemption for a specific hazardous substance or product in response to public health concerns. (§ 1, Ord. 765, eff. October 7, 1976, as amended by §§ 2 and 3, Ord. 1015, eff. August 15, 1985; as amended by § 3, Ord. 1470, eff. July 14, 2016)