In this subtitle the following words have the meanings indicated. “Board” means the Hazardous Waste Facilities Siting Board. “Certificate” means a certificate of public necessity issued by the Board. “Facility” means any structure, equipment, machinery, bins, tanks, pipes, pumps, conveyors, wells, trenches, pits, or cells used for treatment, processing, reconditioning, exchange, incidental storage in connection with the preceding activities, long–term storage, or ultimate disposal of hazardous or low–level nuclear waste. “Hazardous waste” means any waste substance or material designated as a hazardous substance pursuant to § 7–208 of this title. “Low–level nuclear waste” means any substance or material designated as low–level nuclear waste under § 7–208 of this title. “Service” means the Maryland Environmental Service. “Site” means the geographic area to be occupied by a facility, including buffer or security areas and areas used for any appurtenant functions. “Subdivision” means the 23 counties or Baltimore City and incorporated municipalities.