ATCP 93.615(5)(k)2.2. Tanks shall be provided with bottom loading or a fill pipe that terminates within 6 inches of the bottom of the tank. ATCP 93.615(5)(m)1.1. Tanks that are filled via handheld nozzles shall be constantly attended during product delivery and shall be provided with overfill prevention equipment which notifies the person filling the tank with either an audible or a visual signal that the liquid level has reached 90 percent of the tank’s capacity. ATCP 93.615(5)(m)2.2. Tanks that are filled by means of a tight connection between the delivery hose and the fill pipe or a similar device acceptable to the department shall be equipped with overfill prevention equipment that will operate as follows, unless approved otherwise in writing by the department: ATCP 93.615(5)(m)2.a.a. Alert the transfer operator when the tank is no more than 90 percent full by triggering an audible and visual high-level alarm. ATCP 93.615(5)(m)2.b.b. Automatically shut off the flow of liquid into the tank when the tank is no more than 95 percent full. ATCP 93.615(5)(n)(n) Leak detection for aboveground tanks. Leak detection for aboveground tanks shall be provided in accordance with one of the following: ATCP 93.615(5)(n)1.1. Where dikes are provided, a minimum of 2 feet shall be provided between any new tank and the toe of the dike walls, and a minimum of 3 inches shall be provided between the bottom of any new tank and the dike floor, to allow for visual inspection of the exterior tank surface, except as provided in subd. 2. or as otherwise approved by the department. ATCP 93.615(5)(n)2.2. Where double-walled tanks are used or where clearances for visual inspection of the primary containment surface are not provided as specified in subd. 1., interstitial monitoring shall be provided as specified in s. ATCP 93.515 (7). ATCP 93.615(5)(o)(o) Tank enclosures. Aboveground tanks shall be provided with enclosures in accordance with sub. (7). ATCP 93.615(6)(6) Operations involving fixed-tank fuel dispensing facilities. Operations involving fixed-tank fuel dispensing facilities shall follow the requirements in NFPA 30, NFPA 30A, and all of the following: ATCP 93.615(7)(a)(a) The area around an aboveground motor vehicle fuel tank and its secondary containment shall be secured by a 6-foot high noncombustible building or by a 6-foot high noncombustible fence with a gate, except where exempted under par. (b) or (c). ATCP 93.615(7)(b)(b) If the property on which the tanks are located has a perimeter security fence, additional enclosure of the tank system is not required. ATCP 93.615(7)(c)(c) For fleet fuel dispensing tank systems that have an aggregate tank capacity of 1,320 gallons or less, enclosure of the tank by one of the structures listed in par. (a) is not required if all of the following conditions are met: ATCP 93.615(7)(c)5.5. For Class I liquids, all normal vents on the primary tank terminate at least 12 feet above grade. ATCP 93.615 NoteNote: Federal Spill Prevention Control and Countermeasure regulations in 40 CFR 112 may require fencing for tanks with capacities of more than 1,320 gallons. ATCP 93.615(7)(d)(d) Buildings or fences under this subsection shall be made entirely of noncombustible materials and have a minimum of one exit in compliance with chs. SPS 361 to 366. ATCP 93.615(7)(e)(e) Buildings or fences may not be supported by the tanks they enclose. ATCP 93.615(7)(f)(f) Buildings or fenced enclosures may not be used for occupancy, storage, or any other use unless specifically allowed under chs. SPS 361 to 366.