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)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.