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ft Wvl L F, G GEOTEXTILE FABRIC INSTALLATION MINIMUM BURIAL DEPTH-NO TRAFFIC LOAD • Line the side and bottom of the excavation with • 4'- 10'tanks need a minimum cover of 24"backfill or geotextile fabric. 12"backfill plus 4"reinforced concrete • Overlap adjoining geotextile panels a minimum 12". (see Figure G-2). • Place backfill on top of the geotextile fabric to hold it • 12'tanks need a minimum cover of 42"backfill in place. or 38"backfill plus 4"reinforced concrete. • In wet hole conditions,backfill on top of the geotextile • Local codes may require deeper minimum burial fabric is necessary to sink and hold it in place. depth. Figure G-2 4"Reinf.Concrete Qi • !-A'+ (102mm) Adhere to the minimum and maximum dimensions in this \ :'24"Backfill Min. section. / (610mm) 12"Backfill Min. / \ '..•. _'_' (305 mm) / In wet conditions, sufficient overburden and/or an appropriate anchoring system must be used to offset \ _ buoyancy of the tank. Refer to the'Anchor Chart" (Appendix A)for minimum burial depth in buoyant \\•:• conditions. �// ' No Traffic \\ \\ Figure G-1 Diameters 12"Min. 12' Min. (305" (305mm) \ :•:'::'::- ' :'::'•+:'•:::::•.-.•.'. rTmax optional : / :•.. •'. •. •. (2133mm) Y•.Traffic Pad / •'•- -: �:: . :.'..:.. / MINIMUM BURIAL DEPTH-TRAFFIC LOADS \/ �::':•:. :.;::::•k.....:.. ...:..::...:: /// • The following burial depths are suitable for _'..:..'•.:'..' HS20 traffic loads(32,000 lbs/axle), \ ` `'' \ • The concrete traffic pad, reinforcement and thickness, All Tank // must be designed for job conditions and traffic \\\ Diameters : \\/ bads to assure concrete traffic pad integrity. It is the responsibility of the tank owner or tank owner's \\\\ \\ representative to design the traffic pad for all loads. Wet Hole Dry Hole / • 4'- 10'tanks need a minimum cover depth of 18"-2a" :.;.:. ;.;:._ 12"-24" �,// 36"backfill or 18"of backfill plus 6"of einforced (457-610mm) ; (305.610mm) concrete(see Figure G-3). %Anchor Pad11 AV e's/ /� or W backfiell plus 6'!reinforced cont eteackfill Figure G-3 • Traffic pad must extend at least 12"beyond tank rr.1 perimeter in all directions. 11[l�® • The maximum burial depth is T from the tank top - 6"Reinf.Concete (152mm) to grade elevation.Tanks can be designed for burial depths greater than 7',contact your local CSI 36"Backfill Min.,* Min.=: representative prior to tank purchase. =i '--.:. .•. c .. / (914mm) :. 18"Backfill Min. . / • D hole excavations must have a minimum of 12" (457mm) / Dry and a maximum of 24 backfill between the bottom of the tank and either the bottom of the excavation or the top of the concrete anchor pad. \/ \\// • Wet hole excavations must have a minimum of 18" �// Traffic and a maximum of 24"ball between the bottom \\ of the tank and either the bottom of the excavation �// 4',6',8', 10' or the top of the concrete anchor pad. Diameters / ,g