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)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)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)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.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)(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.