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12-foot-diameter tanks],or 18 inches of backfill[36 inches for WARNING 12-foot-diameter tanks]plus 6 inches of reinforced concrete or 9 inches of asphalt.(See FIGURE 5-1.)In a wet condition, In a nontraffic installation,ensure that the areas above the sufficient overburden and/or an appropriate anchoring tanks are not subjected to traffic or other types of loads,which system must be present to offset buoyancy of the tank. could cause tank damage and result in death or serious injury. �., 5.2.3.3.The maximum burial depth is 7 feet of cover over the ® ® top of the tank.Deviation from this may be permissible with prior written authorization from Xerxes.Call your Xerxes representa- 0 0 9" tive for a special quotation prior to tank purchase if the burial 6„ Asphalt depth is to be greater than 7 feet. Concrete III III) 5.2.3.4.Asphalt and concrete pads must extend a minimum of — 12 inches beyond the tank in all directions. 36„ ' 18„ [aa'] : ss"] 5.2.3.5.If there is an unattached manway riser,it must not I I transmit load from the concrete slab to the tank.A minimum I Traffic II II — space of 6 inches must exist between the bottom of the riser I ( I( and the top of the tank. !! I 5.2.3.6.Traffic loads from the top slab must not be transmitted _ to an attached sump or riser.A minimum space of 3 inches must 1z" III ff2_411111MI1111 exist between the riser or sump and the slab. Note:Number in brackets refers to 12-foot-diameter tanks. 5.3.TANK SPACING 5.3.1.GENERAL 5.3.1.1.The following are minimum spacings and must be increased as needed to accommodate deadmen or anchor FIGURE 5-1 slabs. (See SECTION 6.) 5.2.3.2.Tanks not subjected to traffic loads must have a cover 5.3.1.2.Always provide sufficient clearance to allow the deadmen depth of at least 24 inches of backfill[48 inches for 12-foot- to be set outside of the tank"shadow."(See FIGURE 5-3.) diameter tanks],or 12 inches of backfill[36 inches for 12-foot- diameter tanks]plus 4 inches of reinforced concrete or 6 inches of asphalt.(See FIGURE 5-2.)In a wet condition,sufficient overburden and/or an appropriate anchoring system must — Tank shadow be present to offset buoyancy of the tank. I I II I� 6„ I ` 4" Asphalt III - f Concrete — III= II — a'a = 24" 12" 2 x Width [48'� II 136"] I _ No Width(See TABLE 6-1.) Traffic I II-81I -III -- II!I ( FIGURE 5-3 _ ( I 5.3.2.STABLE IN SITU(NATIVE)SOIL CONDITIONS —!! — = = ! 5.3.2.1.Where shoring is not required to maintain a vertical wall 12" from top to bottom of the excavation,and where the soil is stable,the minimum spacing between the sidewall or endcap Note:Number in brackets refers to 12-foot-diameter tanks. of the tank and the side of the excavation must be 18 inches [24 inches for 12-foot-diameter tanks]. FIGURE 5-2 5.3.2.2.If more than one tank is to be installed in the same hole, allow for at least 18 inches between the tanks.(See FIGURE 5-4.) 11