An owner, an operator, and a person in charge of an AST system that installs a shop-fabricated AST in a vault shall: Construct a UL listed vault; Ensure the vault and the vaulted AST comply with the design, construction, installation, and operation requirements of: This regulation; NFPA 30 “Flammable and Combustible Liquids Code”; If the vaulted AST is used as part of a motor fuel dispensing facility, NFPA 30A “Code for Motor Fuel Dispensing Facilities and Repair Garages”; and NFPA 70 “National Electrical Code” for all electrical wiring; Ensure the vaulted AST is: UL listed for aboveground use and for the type of product being stored; Completely enclosed in the vault; and Not partially or entirely covered by backfill; Provide venting for the vault and the vaulted AST according to the following requirements: If the AST stores a Class I liquid, vent the vault in accordance with NFPA 30 “Flammable and Combustible Liquids Code”; Terminate a normal vent for the vaulted AST: Outside of the vault; At least 12 feet above ground level; and At least 5 feet from a building opening; A normal vent for the vaulted AST may not terminate in a location that allows vapors to be trapped by the eaves of a building; Ensure that an emergency vent for the vaulted AST is vapor-tight and allows for the venting of vapors inside of the vault; and Do not use a long-bolt manhole cover as an emergency vent for the vaulted AST; Install vapor and liquid detection systems in the vault that meet the following requirements: The vapor detection system: Is equipped with an on-site alarm that has a battery backup; Has vapor detectors located not higher than 12 inches above the lowest point in the vault; and Is set to alarm when vapors reach or exceed 25 percent of the lower flammable limit of the oil stored; The liquid detection system is: Set to alarm upon detection of a liquid; and Located in accordance with the liquid detection system manufacturer’s instructions; and The vapor and liquid detection systems required under §E(1) and (2) of this regulation are designed so that if either system alarms, a signal alerts the owner, the operator, and the person in charge of the AST system: At a constantly attended location where the vaulted AST is located; or At another location that is continually monitored; and Ensure the vaulted shop-fabricated AST complies with the spill and overfill prevention requirements in Regulation .08 of this chapter.