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A WARNING In a nontraffic installation, ensure that the area above the tank is not subjected to traffic or other types of loads, which could cause damage to the tank, and could result in death or serious injury. 1.3.4.5. Fuel tanks must have a cover depth as shown in Table 1-1. 1.3.4.6. For fuel tanks, as a minimum, tank owner must comply with relevant fire codes—in the US, National Fire Protection Association (NFPA) 30 and 31; and in Canada, the National Fire Code of Canada and/or ap- plicable local codes for fuel tanks. See Table 1-1 for those requirements. Depth of Cover Minimum Requirements for Fuel Tanks No Traffic Options (US Installations) • 24" [60 cm] backfill • 12" [30 cm] backfill + 4" [10 cm] reinforced concrete • 12" [30 cm] backfill + 6" [15 cm] asphalt No Traffic Options (Canadian installations) • 24" [60 cm] backfill Traffic Options (US Installations) • 36" [91 cm] backfill • 18" [46 cm] backfill + 6" [15 cm] reinforced concrete • 18" [46 cm] backfill + 8" [20 cm] asphalt Traffic Options (Canadian installations) • 39" [100 cm] backfill • 18" [46 cm] backfill + 6" [15 cm] reinforced concrete • 18" [46 cm] backfill + 8" [20 cm] unreinforced concrete NOTE: These are NFPA 30 and 31 and National Fire Code of Canada requirements. 1.3.4.7. Tanks other than fuel tanks must have a cover depth as shown in Table 1-2. Depth of Cover Minimum Requirements for Tanks Other Than Fuel No Traffic Options (All Installations) • 12" [30 cm] backfill Traffic Options (All installations) • 36" [91 cm] backfill • 18" [46 cm] backfill + 6" [15 cm] reinforced concrete • 18" [46 cm] backfill + 8" [20 cm] asphalt 1.3.4.8. The maximum burial depth for standard tanks is 7 feet [2.1 meters] of cover over the top of the tank. However, tanks can be designed for a deeper burial. 1.3.4.9. You must obtain prior written authorization from us to deviate from a standard tank's maximum burial depth. 1.3.4.10. Call your sales representative priorto tank purchase foradditional information if the burial depth is to be greater than 7 feet [2.1 meters]. 1.3.4.11. If you are in the process of installing a tank and need to consider a deeper burial than the one given for the tank that was ordered, contact technical support(ena.support@zcl.com) to discuss available options. 1.3.4.12. If a surface pad is used, surface pads must extend a minimum of 12 inches [30 cm] beyond the tank in all directions. 1.3.4.13. If there is an unattached riser, it must not transmit load from the concrete slab to the tank. A minimum space of 6 inches [15 cm] is required between the bottom of the riser and the top of the tank. 1.3.4.14. Traffic loads from the top slab must not be transmitted to a containment sump ora riser. A minimum space of 3 inches [7.6 cm] is required between the riser or sump and the slab. 1.3.5. TANK SPACING NOTE: In certain excavations with unstable soil, where shoring is permanently in place, the excavation might be classified as a stable -soil excavation. The tank ownershould have a qualified engineer certify that the excavation would remain stable for the expected life of the tank installation. 1.3.5.1. GENERAL 1.3.5.1.1. The following are minimum spacings and must be increased as needed to accommodate deadmen or anchor slabs. 1.3.5.1.2. Always provide sufficient clearance to allow the dead men to be set outside of the tank "shadow" See Figure 1-2. 07