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(C) provided with a built-in, continuous leak detection system capable of <br /> detecting a release within 24 hours or at the earliest practicable time, if the owner <br /> or operator can demonstrate to the Department, and the Department concurs, <br /> that the existing leak detection technology or site conditions will not allow <br /> detection of a release within 24 hours. <br /> (f) Ancillary equipment shall be provided with full secondary containment (e.g., <br /> trench, jacketing, double-walled piping) that meets the requirements of <br /> subsections (b) and (c) of this section except for: <br /> (1) aboveground piping (exclusive of flanges, joints, valves, and connections) <br /> that are visually inspected for leaks on a daily basis; <br /> (2) welded flanges, welded joints, and welded connections that are visually <br /> inspected for leaks on a daily basis; <br /> (3) sealless or magnetic coupling pumps and sealless valves, that are visually <br /> inspected for leaks on a daily basis; and <br /> (4) pressurized aboveground piping systems with automatic shut-off devices <br /> (e.g., excess flow check valves, flow metering shutdown devices, loss of <br /> pressure actuated shut-off devices) that are visually inspected for leaks on a <br /> daily basis. <br /> (g) The owner or operator may obtain a variance from the requirements of this <br /> section for existing above-ground tanks in place, if the Department finds, as a <br /> result of a demonstration by the owner or operator, either that alternative design <br /> and operating practices, together with location characteristics, will prevent the <br /> migration of hazardous waste or hazardous constituents into the ground water or <br /> surface water at least as effectively as secondary containment during the active <br /> life of the tank system, or that in the event of a release that does migrate to <br /> ground water or surface water, no substantial present or potential hazard will be <br /> posed to human health or the environment. <br /> (1) In deciding whether to grant a variance based on a demonstration of <br /> equivalent protection of ground water and surface water, the Department will <br /> consider: <br /> (A) the nature and quantity of the waste; <br /> (B) the proposed alternate design and operation; <br /> (C) the hydrogeologic setting of the facility, including the thickness of soils <br /> between the tank system and ground water; and <br /> (D) all other factors that would influence the quality and mobility of the <br /> hazardous constituents and the potential for the constituents to migrate to ground <br /> water or surface water. <br /> (2) In deciding whether to grant a variance, based on a demonstration of no <br /> substantial present or potential hazard, the Department will consider: <br /> (A) the potential adverse effects on ground water, surface water, and land <br /> quality taking into account: <br /> 1 . the physical and chemical characteristics of the waste in the tank system, <br /> including its potential for migration, <br /> 2. the hydrogeological characteristics of the facility and surrounding land, <br />