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Table 2-1 <br /> Lithologic Zones <br /> San Joaquin Human Services Agency Building <br /> Stockton, California <br /> APPROXIMATE <br /> LITHOLOGIC SEDIMENT DEPTH TO TOP OF THICKNESS <br /> ZONE DESCRIPTION LITHOLOGIC ZONE (feet) <br /> (feet bgs) <br /> _ 1 sandy silt(fill) ground surface 0 to 8 <br /> 2 silt and clay ground surface to 8 5 to 36 <br /> _ 3 sand with some gravel 13 to 36 10 to >25.5 <br /> 4 silt and clay 29 to 50 >34 <br /> bgs = below ground surface <br />