This is the preview version of the Wisconsin State Legislature site.
Please see for the production version.
ATCP 93.350(3)(k)3.b. b. The catchment basin shall be compatible with the substance stored for a period of time that will allow for cleanup under all operating conditions.
ATCP 93.350(3)(k)3.c. c. The catchment basin shall be inspected each day of operation for accumulation of liquid and shall have the capacity to contain all spills likely to accumulate in the basin.
ATCP 93.350(3)(L) (L) Tanks subject to melting. Aboveground storage tanks constructed of a material subject to melting when exposed to fire shall be located so that any spill or leak resulting from the failure of the material could not unduly expose persons, structures, or the environment.
ATCP 93.350(3)(m) (m) Tanks subject to scouring.
ATCP 93.350(3)(m)1.1. Storage tanks subject to scouring by the inflow of materials, or subject to wear from manual gauging shall be equipped with wear plates, diffusers, or other means to prevent localized wear or corrosion.
ATCP 93.350(3)(m)2. 2. If wear plates are used, they shall cover an area of at least one square foot and be installed in a manner that prevents crevice corrosion of the tank.
ATCP 93.350(3)(n) (n) Explosion protection. Tanks shall be protected from explosion in accordance with generally accepted engineering practices. Protection shall be provided by cooling systems, fire-resistance measures, depressurizing valves, foundation sloping to prevent burning liquids from accumulating under the tank, or other means determined by a qualified engineer and acceptable to the department.
ATCP 93.350(3)(o) (o) Protection from freezing. Tanks, piping, valves and other ancillary equipment shall be protected from physical damage by freezing.
ATCP 93.350(4) (4)Piping systems.
ATCP 93.350(4)(a)(a) General requirements. Piping systems serving hazardous substance storage tanks shall meet all of the following requirements:
ATCP 93.350(4)(a)1. 1. Piping systems shall be compatible with the substance stored and be protected from failure due to internal and external wear, vibration, shock, and corrosion.
ATCP 93.350(4)(a)2. 2. Piping systems shall be free of leakage, structurally sound, properly supported under all operating conditions and be protected from fire, heat, vacuum, and pressure that would cause the system to fail.
ATCP 93.350(4)(a)3. 3. Piping systems shall be designed, installed, and maintained to prevent damage from expansion, jarring, vibration, contraction, and frost.
ATCP 93.350(4)(a)4. 4. Piping systems shall be protected from collision damage or crushing loads by vehicles and equipment.
ATCP 93.350(4)(a)5. 5. Joint compounds and gaskets shall be compatible with the substance stored.
ATCP 93.350(4)(a)6. 6. Piping with pump or compressor connections shall be provided with shutoff valves located adjacent to the connections.
ATCP 93.350(4)(a)7. 7. Flexible connectors, elbows, loops, expansion chambers or similar measures shall be installed to allow for movement and prevent damage from water hammer.
ATCP 93.350(4)(a)8. 8. Piping systems that carry liquids which expand upon freezing shall be protected from freezing or shall have provisions to prevent rupture due to freezing.
ATCP 93.350(4)(a)9. 9. Refrigerated piping systems shall be constructed of materials suitable for extreme temperatures and pressures in the storage system.
ATCP 93.350(4)(b) (b) National standards. Hazardous substance piping systems serving storage tanks shall be designed, constructed and installed or certified by a qualified engineer in accordance with a standard, as recognized by the department, that is developed by a nationally recognized association or independent testing laboratory.
ATCP 93.350 Note Note: Examples of recognized standards include ORD-C107.7 — Glass-Fibre Reinforced Plastic Pipe and Fittings; and ASTM D 2996 — Standard Specification for Filament-Wound “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Pipe.
ATCP 93.350(5) (5)Secondary containment.
ATCP 93.350(5)(a) (a) General.
ATCP 93.350(5)(a)1.1. All new and existing tank systems used to store hazardous liquids shall be provided with secondary containment.
ATCP 93.350(5)(a)2. 2. Secondary containment systems shall be designed, constructed and installed to prevent the release of regulated substances to the environment at any time during the operational life of a tank system by containing a leak or spill from the system until the leak or spill is detected and removed.
ATCP 93.350(5)(a)3. 3. A building may serve as secondary containment if at least one of the following requirements is met:
ATCP 93.350(5)(a)3.a. a. The building is an enclosed structure resting on or above impermeable surfaces from which a discharge of the entire contents of the largest tank would not escape through any doorway, floor drain or other means.
ATCP 93.350(5)(a)3.b. b. The building drains and spillways are connected to an onsite wastewater treatment facility and are designed and maintained such that any leak or spill cannot drain elsewhere.
ATCP 93.350(5)(a)3.c. c. The building drains and spillways are connected to a municipal wastewater treatment facility with agreement of the municipality on the specific materials stored, and drains and spillways are designed and maintained such that any leak or spill cannot drain elsewhere.
ATCP 93.350(5)(a)4. 4. Secondary containment systems shall be checked for evidence of a leak or spill at least every 30 days.
ATCP 93.350(5)(a)5. 5. Double-walled tanks shall be designed, constructed, and installed to contain a leak from any portion of the inner tank and to detect a failure of the inner or outer wall.
ATCP 93.350(5)(a)6. 6. Capacity requirements for secondary containment structures may be reduced by the amount of available treatment plant capacity that is directly accessible to the tank.
ATCP 93.350(5)(a)7. 7. Secondary containment, including liners and vaults, shall be designed, constructed, and installed to do all of the following:
ATCP 93.350(5)(a)7.a. a. Contain 100 percent of the capacity of the largest tank within the containment area, except as provided in subd. 8.
ATCP 93.350(5)(a)7.b. b. Prevent precipitation or groundwater intrusion from interfering with the ability to contain or detect a leak or spill of a regulated substance.
ATCP 93.350(5)(a)7.c. c. Surround the tank completely and be capable of preventing migration of a regulated substance.
ATCP 93.350(5)(a)7.d. d. Use materials that are compatible with the substances stored and the environment.
ATCP 93.350(5)(a)7.e. e. Isolate incompatible liquids and tank materials from each other and from the environment.
ATCP 93.350(5)(a)8.a.a. Permanent containment structures that are not protected from the weather shall be designed and maintained to allow for the containment of 125 percent of the volume of the largest tank within the containment area.
ATCP 93.350(5)(a)8.b. b. Precipitation and debris shall be removed from the containment structure on a regular basis.
ATCP 93.350(5)(a)8.c. c. No precipitation, ice, or debris that is noticeably contaminated may be discharged to the environment.
ATCP 93.350(5)(a)9. 9. Underground piping shall be provided with secondary containment and leak detection in accordance with sub. (8).
ATCP 93.350(5)(a)10.a.a. Connections to tanks shall be located within a containment structure constructed of compatible material and capable of containing leaks from the connections.
ATCP 93.350(5)(a)10.b. b. The containment structure for underground tanks shall have an access way so connections can be inspected and repaired.
ATCP 93.350(5)(b) (b) Secondary containment systems for product transfers. Transfer of hazardous substances shall take place within a secondary containment system that meets all of the following requirements:
ATCP 93.350(5)(b)1.a.a. For facilities that are designed on or after February 1, 2009, the system shall be capable of containing leaks and spills from the largest compartment of the vehicle being loaded or unloaded, including leaks or spills from connections, couplings, vents, pumps and valves, hose failure, or overturning of a container.
ATCP 93.350(5)(b)1.b. b. For facilities designed or installed before February 1, 2009, the system shall be capable of containing the volume of any leak or spill deemed likely to occur, in the professional judgment of a qualified engineer.
ATCP 93.350(5)(b)1.c. c. Open-ended fill lines shall be located within the secondary containment system.
ATCP 93.350(5)(b)2.a.a. The system shall be designed, installed, and operated to prevent any migration of hazardous substances into the soil or the waters of the state, before cleanup occurs, except as allowed in subd. 2. b.
ATCP 93.350(5)(b)2.b. b. The system may allow migration of the gaseous component of a spill.
ATCP 93.350(5)(b)3. 3. The system shall be constructed, coated, or lined with materials that are compatible with the substances to be transferred and the environment.
ATCP 93.350(5)(b)4.a.a. Product transfers using temporary containment structures shall be constantly attended.
ATCP 93.350(5)(b)4.b. b. The attendant shall be familiar with emergency procedures such that the secondary containment capacity will not be exceeded in the event of a leak or spill.
ATCP 93.350(5)(b)5.a.a. Permanent containment structures shall have sufficient strength and thickness to withstand wear, hydrostatic forces, frost heaving, and weathering.
ATCP 93.350(5)(b)5.b. b. The structure shall support any vehicle brought into the transfer area.
ATCP 93.350(5)(b)6. 6. Permanent containment structures shall have a foundation that prevents failure due to settlement, compression, or uplift.
ATCP 93.350(5)(b)7.a.a. Permanent containment structures shall be designed with a manually controlled drainage system to permit the drainage of liquids resulting from leaks, spills, and precipitation, such as a manually controlled pump or siphon or a manually controlled dike valve.
ATCP 93.350(5)(b)7.b. b. Pump, siphon and valve controls shall be located outside of the diked area.
ATCP 93.350(5)(b)7.c. c. All drainage systems shall be locked in a closed position when a transfer of a hazardous substance is in progress.
ATCP 93.350(5)(b)7.d. d. Spilled or leaked substances shall be removed from the containment system to prevent a release to the waters of the state.
ATCP 93.350(6) (6)Pressure relief and venting.
ATCP 93.350(6)(a) (a) General pressure relief and venting requirements.
ATCP 93.350(6)(a)1.a.a. Tanks shall be protected from over-pressurization and excessive vacuum that may be caused by operator error, filling, emptying, atmospheric temperature changes, pumping, refrigeration, heating, and fire exposure.
ATCP 93.350(6)(a)1.b. b. Tanks subject to failure due to pressure or vacuum shall be provided with pressure control devices as determined by the qualified engineer.
ATCP 93.350(6)(a)1.c. c. Protection shall be provided by vents, rupture discs, pressure or vacuum relief devices, controllers, fail-safe vessel designs, or other means determined by a qualified engineer.
ATCP 93.350(6)(a)2. 2. If a pilot-operated relief valve is used, it shall be designed so the main valve will open automatically and will protect the tank in the event of failure of the pilot valve or other device.
ATCP 93.350(6)(a)3. 3. Venting used on a tank containing a flammable or combustible hazardous substance shall follow the requirements of NFPA 30 sections 21.4.3 and 22.7.
ATCP 93.350(6)(a)4. 4. Vent discharge openings shall be designed and constructed to prevent interference of operation due to precipitation.
ATCP 93.350(6)(a)5. 5. Vents shall have provisions for draining any condensate that may accumulate.
ATCP 93.350(6)(a)6. 6. Vents shall be protected from tampering.
ATCP 93.350(6)(a)7. 7. Vents shall have direct contact with the vapor space of the tank.
ATCP 93.350(6)(a)8. 8. Venting shall be sized to limit the back pressure to less than the maximum pressure allowed by the design of the system.
ATCP 93.350(6)(a)9. 9. Tanks fitted with relief valves may not be equipped with an isolation valve below the relief valve unless 2 or more relief valves are provided, and isolation valves are interlocked.
ATCP 93.350(6)(a)10. 10. Cooled tanks with sealed double-wall construction shall have a pressure relief valve on the outer wall in addition to a pressure relief valve or safety disk on the inner tank.
ATCP 93.350(6)(b) (b) Normal venting. Closed-roof atmospheric tanks and low-pressure tanks shall be equipped with normal vents designed to accommodate all of the following conditions:
ATCP 93.350(6)(b)1. 1. Inbreathing resulting from maximum outflow of liquid from the tank.
ATCP 93.350(6)(b)2. 2. Inbreathing resulting from contraction of vapors caused by a decrease in atmospheric temperature.
ATCP 93.350(6)(b)3. 3. Outbreathing resulting from maximum inflow of liquid into the tank and maximum evaporation caused by the inflow.
ATCP 93.350(6)(b)4. 4. Outbreathing resulting from expansion and evaporation that result from maximum increase in atmospheric temperature.
ATCP 93.350 Note Note: Examples of normal venting include pilot-operated relief valves, pressure relief valves, pressure-vacuum valves, conservation vents, open vents, or a combination of devices.
ATCP 93.350(6)(c) (c) Emergency venting.
Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.