1 Del. Admin. Code § 706-5-2.0
"Aisle". An accessible clear space between storage piles or groups of piles suitable for housekeeping operations, visual inspection of piling areas, and initial firefighting operations.
"Clear Space". Any area free of combustible materials. This does not preclude the storage of non-combustible materials that will not transmit an exposed fire.
"Fire Lane". A clear space suitable for firefighting access and operations by motorized fire apparatus. See also Regulation 705, Chapter 5.
"Scrap Tire". A tire that is no longer suitable for vehicular use.
"Units (Equivalent Passenger)". One average size passenger tire weighing approximately 25 pounds.
"Yard". The outdoor areas where tires and scrap tires are stored, and includes the entire area located inside the security fence.
1 Del. Admin. Code § 706-5-2.0