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Settlement (inches) , Where <br /> Thickness of Existing Subsurface Composed of <br /> Improved or <br /> Tank Diameter Net Pressure Replaced Materials Glass Silty Sand <br /> 43.5 ft 1800 psf 0 ft 6 - 10 3.5 - 5 <br /> 4 ft - 2.5 - 4 <br /> 8 ft 2 - 3.5 1.5 - 2.5 <br /> 12 ft 1 - 1.8 1 - 1.5 <br /> 16 ft 0.5 - 0.75 0.5 - 0.75 <br /> 2200 psf 0 ft 7 - 12 4 - 6 <br /> 8 ft 2.5 - 4 _ 2 - 3 <br /> 16 ft 0.75 - 1 0.75 - 1 <br /> ----------------------------------------------------------------------------------------------------- <br /> 16 ft 1200 psf 0 ft 4 - 6 2 - 3_ <br /> 4 ft 2.5 - 3.5 - a <br /> 8 ft 1 - 1.5 0.5 - 1 <br /> 12 ft 0.5 - 1 - <br /> 16 ft 0.25 - 0.5 0.25 - 0.5 <br /> NOTE: Settlements are in addition to settlements due to grade raise. <br /> ESTIMATED SETTLEMENT BENEATH TANKS <br /> San Joaquin Site 3058 <br /> McCLELLAND CONSULTANTS Plate 44 <br />