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(B) protected, if constructed of metal, from both corrosion of the primary tank interior and the external surface of the outer shell,and (C) provided with a built-in, continuous leak detection system capable of detecting a release within 24 hours or at the earliest practicable time, if the owner or operatorcan demonstrate to the Department, and the Department concurs, that the existing leak detection technology or site conditions will not allow detection of a release within 24 hours. (f) Ancillary equipment shall be provided with full secondary containment (e.g., trench, jacketing, double-walled piping) that meets the requirements of subsections (b) and(c) of this section except for: (1) aboveground piping (exclusive of flanges,joints, valves, and connections) that are visually inspected for leaks on a daily basis, (2) welded flanges, welded joints, and welded connections that are visually inspected for leaks on a daily basis; (3) sealless or magnetic coupling pumps and seatless valves, that are visually inspected for leaks on a daily basis;and (4) pressurized aboveground piping systems with automatic shut-off devices (e.g., excess flow check valves, flow metering shutdown devices, loss of pressure n actuated shut-off devices) that are visually inspected for leaks on a daily basis. (g) The owner or operator may obtain a variance from the requirements of this section for existing above-ground tanks in place, if the Department finds, as a result of a demonstration by the owner or operator, either that alternative design and operating practices, together with location characteristics, will prevent the migration of hazardous waste or hazardous constituents into the ground water or surface water at least as effectively as secondary containment during the active life of the tank system, or that in the event of a release that does migrate to ground water or surface water, no substantial present or potential hazard will be posed to human health or the environment. (1) In deciding whether to grant a variance based on a demonstration of equivalent protection of ground water and surface water, the Department will consider. (A) the nature and quantity of the waste; (B) the proposed alternate design and operation; (C) the hydrogeologic setting of the facility, including the thickness of soils between the tank system and ground water,and (D) all other factors that would influence the quality and mobility of the hazardous constituents and the potential for the constituents to migrate to ground water or surface water. (2) In deciding whether to grant a variance, based on a demonstration of no substantial present or potential hazard, the Department will consider: Hazardous Waste Tank Assessment Report Martin Consulting Oil Stop, 301 W.Kettleman Lane Page 16 of 29 Group,Inc.—Structural Design