In this subtitle the following words have the meanings indicated. “Hazardous liquid” means: any petroleum or petroleum product; any anhydrous ammonia; any carbon dioxide; or any substance or material that: is in a liquid state when transported by a pipeline facility; and may pose an unreasonable risk to life or property when transported by a pipeline facility, as determined by the United States Secretary of Transportation. “Hazardous liquid” does not include liquefied natural gas. “Interstate pipeline” means a pipeline, or part of a pipeline, regulated under 49 U.S.C. Chapter 601 that is used in the transportation of hazardous liquids or carbon dioxide in interstate or foreign commerce. “Intrastate pipeline” means a pipeline, or part of a pipeline, regulated under 49 U.S.C. Chapter 601 that: is used in the transportation of hazardous liquids or carbon dioxide; and is not an interstate pipeline. “Pipeline facility” means new and existing pipe, rights–of–way, and any equipment, facility, or building used in the transportation of hazardous liquids or carbon dioxide. “Pipeline operator” means a person who owns or operates a pipeline facility.