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7.5.3. SPACING IN UNSTABLE IN SITU 8.2. ANCHOR STRAPS (NATIVE SOIL) CONDITIONS 8.2.1. GENERAL 7.5.3.1.Xerxes recommends that the tank owner seek the ad- 8.2.1.1.Only Xerxes anchor straps may be used when anchor- vice of a local foundation professional engineer if the in situ ing a Xerxes tank. soil is extremely soft or inherently unstable(for example,peat, quicksand,muck,landfill,soft or highly expansive clay,under- 8.2.12•Xerxes has two anchor strap models(not including ground stream,etc.). man-out-of-hole straps)—D-ring/hook anchor straps and D- ring/D-ring anchor straps. 7.5.3.2.If the soil has less than 750 lbs./sq.ft.cohesion as calculated from an unconfined compression test;or in soils 8.2.1.2.1.Depending on which type of anchor strap is being having an ultimate bearing capacity of less than 3,500 lbs./sq. used,see either SECTION 8.2.2.or 8.2.3. ft.;or where soil will not maintain a vertical wall,the excava- 8.2.1.3.The locations for anchor straps on each tank are tion must allow a minimum space equal to one-half(1/2)the marked on the tank ribs by the arrowhead symbols 1101(on diameter of the tank between the excavation wall and both the the tank itself on 4-foot-diameter tanks). side and the endcap of the tank to enhance lateral resistance. See FIGURE 7-4. 8.2.2. D-RING/HOOK ANCHOR STRAPS 8.2.2.1.When installing any size tank,and when using Xerxes' D-ring/hook anchor straps and Xerxes'prefabricated dead- men,the deadmen are to be placed so that the top of the 112 deadmen is even with the bottom of the tank.See FIGURE 8-1 Tank Dia. and TABLE 8-1 for anchor-point dimensions. 16' 11111 Position strap clip at tank top i ' VIII- c VIII- _ =11111 1-11111 112 Tank Dia. 112 Tank Dia. 111 = I 11111= I° I I IL_ , _ =11111 II-11111 Unstable Sod 1111-11 II II -VIII B III-11111 FIGURE 7-4 11111 1111111 i III II 7.5.3.3.Stabilizing materials,such as a reinforced concrete A 1111=11111 slab,may be required under the tank as a foundation in addi- tion to the required 12-inch bedding in an excavation where = — — 3" —12 Deadmen —11111-11111 the bottom is unstable. 11111=11111VIII-11111=VIII-11111-11111-11111= 7.5.3.4.The spacing between adjacent tanks is to be at least =11111= 1111=11111—11111-11111—11111=11111 18 inches.See FIGURE 7-4. 7.5.3.5.If deadmen are used,follow the spacing requirements FIGURE 8-1 between the tanks given in POINTS 7.5.2.3.and 7.5.2.3.1. Anchoring Dimensions for FIGURE 8-1 8. ANCHORING SYSTEMS Tank Dial A B c Dmin. Dmax. 8.1. GENERAL 4' 18' 13"_ 9' e' 27' 30• 8.1.1.The tank owner or the owner's technical representative is 8' 26' 10' 13'-5' 42" 48' responsible for determining an appropriate anchoring system. a. 26' 20" 1T-1D' 52' W. 8.1.2.Xerxes recommends that every site be thoroughly evalu- 10' 26' 34' 23'_9" 69' 75' ated for the potential of a rise in the local water table or of 12' 26' 43' 27'-9' 87' 93' trapped water(a wet-hole condition).Sufficient overburden and/or an appropriate anchoring system must be present to TABLE 8-1 offset buoyancy of the tank in such conditions. 8.2.3. D-RING/D-RING ANCHOR STRAPS 8.2.3.1.When installing any size tank,and when using Xerxes' CAUTION D-ring/D-ring anchor straps and Xerxes'prefabricated dead- Failure to provide sufficient overburden and/or an appropri- men,the deadmen are to be placed so that the top of the ate anchoring system may cause tank failure,or may result deadmen is even with the bottom of the tank.See FIGURE 8-2 in damage to the tank and/or surrounding properly. and TABLE 8-2 for anchor-point dimensions. 14