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ODEPTH OF EXCAVATION O EXCAVATION SIZE The hole must be deep enough to provide sufficient Stable Soil Conditions bedding and cover depth as determined by the type of Where shoring is not required to maintain a vertical wall surface pavement and loading. 30 and 31 should from top to bottom of the excavation, the minimum be consulted as well as local coddes.es. spacing between the sidewall or endcap of the tank and Tanks subjected toI r -_ side of excavation must be 24 inches(61cm). traffic loads must have 6" i- p — LAUim a cover depth of atI O 6„ If more than one tank is to be installed in the same hole, least 30 inches(76cm) 'I` there must be at least 24 inches (61cm) between the of backfill plus 6 inches I tanks. (15cm) of asphalt, An = I acceptable alternative 30 TRAFFIC DRY 8 IS a minimum Of 16 - CONDITIONS inches (46cm) of f'-Stable backfill plus 6 inches = 12 Soil (15cm) of steel re-bar reinforced concrete. I Tanks subjected to traffic loads and high water must have a 24 — 24' —►124rf— minimumof30inches (76cm) of backfill andI ,M either 8 inches (20cm) r ' `� 1= =1 II _ of asphalt or 6 inches FFIC A 'TR (15cm) of steel re-bar 30, AFT -30" reinforced concrete. CONDITIONS) - 12„ - Unstable Soil Conditions If the soil has less than 750 lbs/sq. ft. cohesion as cal- AdW+ culated from an unconfined compression test;or in soils Tanks not subjected to having an ultimate bearing capacity of less than 3500 traffic loads must have lbs/sq. ft.;or where soil will not maintain a vertical wall, a minimum cover P4" the excavation must allow a minimum space equal to 1/2 depth of 24 inches _ 4" 12' the diameter of the tank between the side and endcap (61 cm)of backfill,or 12 = _ of the tank and the excavation wall. The spacing be- inches (30cm) backfill A tween adjacent tanks, 24 inches (61cm), remains the plus 4 inches (10cm) = DRY same. of steel re-bar rein- - CONDITIONS _ NO �j forced concrete. _ TRAFFIC [III Unstable, V 1 12T, /2 Soil nk ia. Tanks in high water areas not subjected totraffic loads must havea minimum of 36 Tank inches (91cm) ofU36" Dia. 24backfill covering. "..'r `=h._ - -" NOTE: MANWAY RISER MUST NOT REST ON THE TANK.There must be a minimum six-inch space between the bottom of the riser and top of the tank. NOTE:These depths of cover are MINIMUMS for high water areas without traffic over the tank. NOTE:Asphalt and concrete pads must extend a minimum of 12 inches (30cm)beyond tank in all directions. NOTE:Maximum burial depth is 7 feet(2.1 meters)of cover over top of tanks.