“Hazardous materials” means any material, including any substance, waste, or combination thereof, which, because of its quantity, concentration or physical, chemical or infectious characteristics, may cause, or significantly contribute to, a substantial present or potential hazard to human health, safety, property or the environment, when improperly treated, stored, transported, disposed of, or otherwise managed. (Ord. 1397.18, § 1 (part), 2019)