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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.
ATCP 93.350(6)(c)1.1. Atmospheric, low-pressure and high-pressure aboveground tanks shall have emergency venting to ensure that the maximum pressure for the tank is not exceeded.
ATCP 93.350(6)(c)2. 2. Emergency venting shall be designed by a qualified engineer in accordance with good engineering practices.
ATCP 93.350 Note Note: Examples of emergency venting include larger or additional open vents, pressure-vacuum valves, pressure relief valves, a gauge hatch that permits the cover to lift under abnormal internal pressure or a manhole cover that lifts when exposed to abnormal internal pressure.
ATCP 93.350(6)(d) (d) Labeling of pressure relief valves.
ATCP 93.350(6)(d)1.1. Where safety, pressure relief or vacuum relief valves are used, each valve shall be permanently labeled with all of the following information:
ATCP 93.350(6)(d)1.a. a. The name or identifying trademark of the manufacturer.
ATCP 93.350(6)(d)1.b. b. The manufacturer's design or type number.
ATCP 93.350(6)(d)1.c. c. The pipe size of the inlet.
ATCP 93.350(6)(d)1.d. d. The set pressure or vacuum, in pounds per square inch gauge.
ATCP 93.350(6)(d)1.e. e. The full open pressure or vacuum, in pounds per square inch gauge.
ATCP 93.350(6)(d)1.f. f. The capacity at the indicated pressure or full open vacuum, in either cubic feet of gas per minute or cubic feet of gas per hour.
ATCP 93.350(6)(d)2. 2. The labeling shall be provided either on the valve itself or on a plate securely fastened to the valve.
ATCP 93.350(7) (7)Temperature monitoring.
ATCP 93.350(7)(a)(a) Temperature indicators and corresponding alarms shall be provided for storage tanks where heat from a reaction could cause damage to the system or a release to the environment.
ATCP 93.350(7)(b) (b) Heated or cooled tanks shall be equipped with appropriate thermal controls and gauges.
ATCP 93.350(7)(c) (c) Protection against overheating or overcooling shall be provided for heated or cooled tanks in accordance with generally accepted engineering practices.
ATCP 93.350 Note Note: Means of protection may include temperature controllers, insulation, alarms, cooling systems, and special material selection.
ATCP 93.350(8) (8)Leak detection for underground tank systems.
ATCP 93.350(8)(a) (a) Underground storage tank systems that contain federally regulated hazardous substances shall be equipped with a leak detection system which will detect a leak in the primary containment of the tank and piping.
ATCP 93.350(8)(b) (b) The leak detection method shall be capable of meeting the requirements in s. ATCP 93.510, except as provided in par. (c).
ATCP 93.350(8)(c) (c) Other methods of leak detection may be used if approval from the department is obtained before the installation and operation of the new UST system.
ATCP 93.350(9) (9)Corrosion protection. Corrosion protection shall be provided in accordance with s. ATCP 93.520 for underground storage tank systems or s. ATCP 93.400 for aboveground storage tank systems.
ATCP 93.350(10) (10)Identification and labeling.
ATCP 93.350(10)(a) (a) Transfer points shall be labeled with the name of the substance transferred.
ATCP 93.350(10)(b) (b) Aboveground tanks storing hazardous substances within the scope of this section shall be identified and labeled in accordance with s. ATCP 93.400 (7).
ATCP 93.350 Note Note: Section ATCP 93.400 (7) requires conformance with NFPA 704.
ATCP 93.350(10)(c) (c) All tanks on a property shall have a unique tank identification number that is readily visible to emergency response personnel.
ATCP 93.350(11) (11)Inspections, changes in service, tank closure, and releases from a tank.
ATCP 93.350(11)(a) (a) Aboveground storage tanks.
ATCP 93.350(11)(a)1.1. Aboveground storage tanks shall comply with ss. ATCP 93.440 to 93.470, except as provided in subd. 2.
ATCP 93.350(11)(a)2. 2. Periodic inspections of aboveground tanks may be conducted in accordance with any nationally recognized standard that is more applicable to hazardous tanks than STI SP001.
ATCP 93.350(11)(a)3. 3. Existing and new aboveground fiberglass storage tanks shall have certified external tank inspections and certified tank integrity inspections in accordance with HIR FTV RP 2007.
ATCP 93.350 Note Note: Aboveground storage tanks which store hazardous substances and which have a capacity of less than 5,000 gallons are exempt from this chapter unless the substance is also flammable or combustible.
ATCP 93.350 Note Note: Sections ATCP 93.440 to 93.470 address inspections; seldom-used and temporarily out of service tanks; change in service to store a non-regulated substance; tank closures; tank-system site assessment; and confirming and responding to leaks, spills, overfills and releases.
ATCP 93.350 Note Note: The department accepts use of the following standard for performing periodic inspections under this subdivision: HIR FTV RP 2007, In-Service Inspection of Aboveground Atmospheric Fiberglass Reinforced Plastic Tanks and Vessels, as published by HIR Technical Services. This standard is available by contacting FTPI at
ATCP 93.350(11)(b) (b) Underground storage tanks. Underground storage tanks shall comply with ss. ATCP 93.545 to 93.585.
ATCP 93.350 Note Note: Sections ATCP 93.545 to 93.585 address seldom-used and temporarily out of service tanks; change in service to store a non-regulated substance; tank system closures; conditions indicating releases; tank system integrity assessments; tank system site assessments; and responding to leaks, spills, overfills and releases.
ATCP 93.350(13) (13)Security at chemical storage facilities. Owners and operators shall be aware of regulations, standards and operating practices that relate to facility security.
ATCP 93.350 Note Note: Information on how to develop a comprehensive site security program is available in the API document Security Guidelines for the Petroleum Industry, or the American Chemistry Council document, Site Security Guidelines for the U.S. Chemical Industry.
ATCP 93.350 History History: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19; correction in (1) (b) 5., (4) (b) made under s. 35.17, Stats., Register October 2019 No. 766.
ATCP 93.360 ATCP 93.360 Storage of Class IA flammable liquids.
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.