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BURIAL DEPTH &COVER <br /> Figure 8-2 <br /> BURIAL8. 4"Reinf.Concrete <br /> 8.1. Adhere to the minimum and maximum r (102ri <br /> dimensions in this section. <br /> 8.2. In wet conditions,sufficient overburden and/or 24 Backfin Mm.>,., . ':: ` <br /> / (610mm) .,.5 12"Backfill Min. <br /> an appropriate anchoring system must be used \ t., (305 mm) <br /> to offset buoyancy of the tank.Minimum burial <br /> depth(section 8)may not be sufficient to anchor \ / <br /> the tank in buoyant conditions.Refer to the <br /> "Anchor Chart"(Appendix A)for minimum burial /\\ No Traffic \ <br /> // 4',6',8',10' <br /> depth in buoyant conditions. j\\\. :: Diameter: \\j <br /> Figure 8-1 \//\ '. icor 12 diameter <br /> \\ to ks let udl \\/ <br /> 12 Min 12 Min. <br /> (305mm) <br /> - .7 Max •optional -`/\ /\/\ /\/ <br /> (2133mm) Traffic Pad <br /> \ 8.3.2. 12'tanks need a minimum cover of 42"backfill <br /> or 38"backfill plus 4"reinforced concrete. <br /> 8.3.3. Local codes may require deeper minimum <br /> \ burial depth. <br /> All Tank <br /> /\\ \� 8.4. Minimum Burial Depth Traffic Loads <br /> Diameters \/ ` <br /> /\\ Wet Hole Dry Hole /\\/\ With o ut a co n crete traff ic pad,soi I m ust be co nsol i d ated <br /> 18' 24' 12-24" /\/\ <br /> (457 6,omm1 (4305 610mm) \//\\//\ such that rutting of the soil will not occur from any <br /> equipment or vehicles. <br /> `Optional <br /> \ Pad <br /> //\A 1 1r/1. i /\\//\ <br /> 8.4.1. The following burial depths are suitable for <br /> HS20 traffic loads(32,000 lbs/axle). <br /> 8.2.1. Traffic pad must extend at least 12"beyond <br /> tank perimeter in all directions. 8.4.2. The concrete traffic pad,reinforcement and <br /> thickness,must be designed forjob conditions <br /> 8.2.2. The maximum burial depth is Tfrom the tank and traffic loads to assure concrete traffic <br /> top to grade elevation.Tanks can be designed pad integrity.It is the responsibility of the <br /> for burial depths greater than 7'Contact your tank owner or tank owner's representative to <br /> local CSI representative prior to tank purchase. design the traffic pad for all loads. <br /> 8.2.3. Dry hole excavations must have a minimum 8.4.3. 4'-10'tanks need a minimum cover depth of <br /> of 12"and a maximum of 24"backfill between 36"backfill or 18"of backfill plus 6"of <br /> the bottom of the tank and either the bottom reinforced concrete(see Figure 8-3). <br /> of the excavation or the top of the concrete Figure 8-3 <br /> anchor pad. <br /> 8.2.4. Wet hole excavations must have a minimum ErAll® <br /> of 18"and a maximum of 24"backfill between <br /> the bottom of the tank and either the bottom 6"Reinf.Concrete <br /> of the excavation or the top of the concrete (152mm) <br /> anchor pad. <br /> \ ::! 3fi"Backfill Min.:(.'::...:.;:'.. .. <br /> 8.3. Minimum Burial Depth- No Traffic Load �/ : (914mm) 8"Backfill Min. <br /> 8.3.1. 4'-10'tanks need a minimum cover of 24" 452mm) <br /> backfill or 12"backfill plus 4"reinforced <br /> concrete(see Figure 8-2). //\':::::::::::';.:':: <br /> Traffic \\� <br /> / a•,6,8',10' / <br /> (Por td'diameter <br /> \/\ ranks, <br /> 14 <br />