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® - . F, G <br /> GEOTEXTILE FABRIC INSTALLATION MINIMUM BURIAL DEPTH-NO TRAFFIC LOAD <br /> • Line the side and bottom of the excavation with • 4'- 10'tanks need a minimum cover of 24"backfill or <br /> geotextile fabric. 12"backfill plus 4"reinforced concrete <br /> • Overlap adjoining geotextile panels a minimum 12". (see Figure G-2). <br /> • Place backfill on top of the geotextile fabric to hold it • 12'tanks need a minimum cover of 42"backfill <br /> in place. or 38"backfill plus 4"reinforced concrete. <br /> • In wet hole conditions, backfill on top of the geotextile • Local codes may require deeper minimum burial <br /> fabric is necessary to sink and hold it in place. depth. <br /> Figure G-2 <br /> 4'°Reinf.Concrete <br /> e ® • 1 (102mm) <br /> Adhere to the minimum and maximum dimensions in this 24"Backfill Min. <br /> section. \ (610mm) 12"Backfill Mina <br /> i_ _ _ (305mm) <br /> ffi \ <br /> In wet conditions, sufficient overburden and/or an _ _ _ <br /> �/ - - - - 1 <br /> appropriate anchoring system must be used to offset <br /> buoyancy of the tank. Refer to the"Anchor Chart" <br /> (Appendix A)for minimum burial depth in buoyant /\\ NO Traffic \/\ <br /> conditions. <br /> Figure G-1 / 4',6',8', 10' / <br /> Diameters <br /> 12"Min. 12"Min. <br /> (305 mm) (305 mm) j\\ <br /> 7'Max ; OptioJnal /\ <br /> (2133mm) Traffic Pad \ <br /> MINIMUM BURIAL DEPTH-TRAFFIC LOADS <br /> • The following burial depths are suitable for <br /> \ ( HS20 traffic loads(32,000 lbs/axle). <br /> • The concrete traffic pad, reinforcement and thickness, <br /> All Tank must be designed for job conditions and traffic <br /> \\\\\ Diameters \\\ loads to assure concrete traffic pad integrity. It is <br /> the responsibility of the tank owner or tank owner's <br /> representative to design the traffic pad for all loads. <br /> Wet Hole Dry Hole //\\//� • 4'- 10'tanks need a minimum cover depth of <br /> 18"-24" 12 24' //\//\ 36" backfill or 18"of backfill plus 6"of reinforced <br /> (457 610mm) (3`05 610mm) \/\/\ concrete(see Figure G-3). <br /> J'%��i `Optional //\//� 12'tanks need a minimum cover of 48"backfill <br /> ��\��\��/�/<\�/\/ <br /> Anchor /�\\\ or 36"backfill plus 6°'reinforced concrete. <br /> //..//.. <br /> i Figure G-3 <br /> • Traffic pad must extend at least 12"beyond tank EM <br /> perimeter in all directions. <br /> • The maximum burial depth is 7°from the tank top 6"Reinf.Concrete <br /> (152mm) <br /> to grade elevation. Tanks can be designed for \ <br /> burial depths greater than T, contact your local CSI \ 36"Backfill Min. <br /> representative prior to tank purchase. (914mm) 18"Backfill Min. <br /> • Dry hole excavations must have a minimum of 12" 11 (457mm) <br /> and a maximum of 24"backfill between the bottom �/ ` - _ 1 - - - - - - - r <br /> of the tank and either the bottom of the excavation <br /> or the top of the concrete anchor pad. <br /> • Wet hole excavations must have a minimum of 18" //\ Traffic <br /> and a maximum of 24"backfill between the bottom \ \\ \\ \ <br /> 4'.6', <br /> of the tank and either the bottom of the excavation / <br /> or the top of the concrete anchor pad. \\� Diameters <br /> \A A A A A <br /> 15 <br />