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Depth of Cover 7.5. TANK SPACING Minimum Requirements for Tanks 7.5.1. GENERAL Other than Petroleum Tanks 7.5.1.1.The following are minimum spacings and must be in- creased as needed to accommodate deadmen or anchor No Traffic slabs.See SECTION 8. • 12'backfill 7.5.1.2.Always provide sufficient clearance to allow the dead- Traffic Options men to be set outside of the tank"shadow."See FIGURE 7-2. • 36'backfill • 18'backfill+6'reinforced concrete III _ Tank Shadow • 18'backfill+8'asphalt III I NOTE:The maximum burial depth for standard tanks is 7 — II feet of cover over the top of the tank. I TABLE 7-1 —II 7.4.7.Tank owner must follow NFPA 30 and 31,as a minimum, 11111=11 for petroleum tanks.See TABLE 7-2 for those requirements. — Depth of Cover = I Minimum Requirements for Petroleum Tanks 2 x Width No Traffic Options E 8-4) • 24'backfillTABL • 12'backfill+4'reinforced concrete FIGURE 7-2 • 12'backfill+6'asphaR 7.5.2. SPACING IN STABLE IN SITU (NATIVE) Traffic Options SOIL CONDITIONS • 36'backfill 7.5.2.1.The minimum spacing between the sidewall or endcap • 18'backfill+6'reinforced concrete of the tank and the side of the excavation must be 18 inches. • 18'backfill+8'asphalt See FIGURE 7-3. NOTE These ars NFPA 30 and 31 requirements. NOTE:All measurements from the tank sidewalls are to be taken from the outside diameter of the tank ribs. TABLE 7-2 7.4.8.The maximum burial depth for standard tanks is 7 feet — of cover over the top of the tank.However,tanks can be de- signed for a deeper burial. IIIA 7.4.8.1.Call your Xerxes representative for a special quotation — prior to tank purchase if the burial depth is to be greater than ta" t8" 79" 7 feet. II 7.4.8.2.If you are installing a tank and need to consider a deeper burial than that given for the tank that was ordered,con- tact your Xerxes representative to discuss available options. _ --I I —li III lul II = 7.4.8.3.Prior written authorization from Xerxes is required to li Stable Soil _ deviate from a standard tank's maximum burial depth. 7.4.9.Surface asphalt and concrete pads must extend a mini- FIGURE 7-3 mum of 12 inches beyond the tank in all directions. 7.5.2.2.If two or more tanks are installed in the same hole,allow 7.4.10.If there is an unattached riser,it must not transmit load for at least 18 inches between the tanks.See FIGURE 7-3. from the concrete slab to the tank.A minimum space of 6 7.5.2.3.If two or more tanks are installed in the same hole and inches must exist between the bottom of the riser and the top deadmen are used,the space between the tanks must be of the tank. equal to or greater than two times the width of the deadman 7.4.11.Traffic loads from the top slab must not be transmitted or deadmen required between the tanks.See FIGURE 7-2 and to a containment sump or a riser.A minimum space of 3 TABLE 8-4. Inches must exist between the riser or sump and the slab.See 7.5.2.3.1.For instance,the space between tanks using dead- SECTION 16. men is typically 24 inches for tanks up to and including 8-foot- diameter tanks,36 inches for 10-foot-diameter tanks,and 72 inches for 12-foot-diameter tanks. 13