NR 661.0193(4)(4) In addition to the requirements under subs. (1) to (3), a secondary containment system shall satisfy all of the following requirements: NR 661.0193(4)(a)1.1. Designed or operated to contain 100 percent of the capacity of the largest tank within its boundary. NR 661.0193(4)(a)2.2. Designed or operated to prevent run-on or infiltration of precipitation into the secondary containment system unless the collection system has sufficient excess capacity to contain run-on or infiltration. The additional capacity shall be sufficient to contain precipitation from a 25-year, 24-hour rainfall event. NR 661.0193(4)(a)4.4. Designed and installed to surround the tank completely and to cover all surrounding earth likely to come into contact with the material if the material is released from the tank. NR 661.0193(4)(b)1.1. Designed or operated to contain 100 percent of the capacity of the largest tank within its boundary. NR 661.0193(4)(b)2.2. Designed or operated to prevent run-on or infiltration of precipitation into the secondary containment system unless the collection system has sufficient excess capacity to contain run-on or infiltration. Such additional capacity shall be sufficient to contain precipitation from a 25-year, 24-hour rainfall event. NR 661.0193(4)(b)3.3. Constructed with chemical-resistant water stops in place at all joints, if any. NR 661.0193(4)(b)4.4. Provided with an impermeable interior coating or lining that is compatible with the stored material and that will prevent migration of material into the concrete. NR 661.0193(4)(b)5.5. Provided with a means to protect against the formation of and ignition of vapors within the vault, if the material being stored or treated is ignitable or reactive. NR 661.0193(4)(b)6.6. Provided with an exterior moisture barrier or be otherwise designed or operated to prevent migration of moisture into the vault if the vault is subject to hydraulic pressure. NR 661.0193(4)(c)1.1. Designed as an integral structure, an inner tank completely enveloped within an outer shell, so that any release from the inner tank is contained by the outer shell. NR 661.0193(4)(c)2.2. Protected, if constructed of metal, from both corrosion of the primary tank interior and of the external surface of the outer shell. NR 661.0193(4)(c)3.3. Provided with a built-in continuous leak detection system capable of detecting a release within 24 hours, or at the earliest practicable time. NR 661.0193 NoteNote: The provisions outlined in the Steel Tank Institute’s “Standard for Dual Wall Underground Steel Storage Tanks” may be used as guidelines for aspects of the design of underground steel double-walled tanks.
NR 661.0193(6)(6) Ancillary equipment shall be provided with secondary containment, such as trenching, jacketing, or double-walled piping that meets the requirements under subs. (1) and (2) except for the following: NR 661.0193(6)(a)(a) Aboveground piping, excluding flanges, joints, valves, and other connections, that are visually inspected for leaks on a daily basis. NR 661.0193(6)(b)(b) Welded flanges, welded joints, and welded connections that are visually inspected for leaks on a daily basis. NR 661.0193(6)(c)(c) Sealless or magnetic coupling pumps and sealless valves that are visually inspected for leaks on a daily basis. NR 661.0193(6)(d)(d) Pressurized aboveground piping systems with automatic shut-off devices, such as excess flow check valves, flow metering shutdown devices, or loss of pressure actuated shut-off devices that are visually inspected for leaks on a daily basis. NR 661.0193 HistoryHistory: CR 19-082: cr. Register August 2020 No. 776, eff. 9-1-20. NR 661.0194(1)(1) Hazardous secondary material or treatment reagents may not be placed in a tank system if they could cause the tank, its ancillary equipment, or the containment system to rupture, leak, corrode, or otherwise fail. NR 661.0194(2)(2) A remanufacturer or other person that stores or treats hazardous secondary material shall use appropriate controls and practices to prevent spills and overflows from tank or containment systems. These include at a minimum all of the following: NR 661.0194(2)(a)(a) Spill prevention controls, such as check valves or dry disconnect couplings.