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Settlement (inches), Where <br /> Thickness of Existing Subsurface Composed of <br /> Improved or <br /> Footing Width Net Pressure Replaced Materials Glass Silty Sand <br /> 2 ft 600 psf 0 ft 1 - 1.5 0.5 - 0.75 <br /> 2 ft 0.25 - 0.6 0.25 - 0.5 <br /> 1200 psf 0 ft 1 - 1.75 0.75 - 1.25 <br /> 2 ft 0.5 - 0.75 0.25 - 0.5 <br /> ----------------------------------------------------------------------------------------------------- <br /> 4 ft 600 psf 0 ft 1 - 1.75 0.5 - 1 <br /> 4 ft 0.25 - 0.75 <0.25 - 0.5 <br /> 16 ft <0.25 <0.25 <br /> 1200 psf 0 ft 2 - 3 0.75 - 1.25 <br /> 4 ft 0.75 - 1.25 0.5 - 0.75 <br /> 8 ft - - <br /> 16 ft <0.25 0.25 - 0.4 <br /> 1800 psf 0 ft 3 - 4.5 1 - 2 <br /> 4 ft 1 - 1.5 0.5 - 0.75 <br /> 8 ft 0.5 - 0.75 0.25 - 0.5 <br /> 16 ft 0.25 - 0.4 0.25 - 0.4 <br /> ----------------------------------------------------------------------------------------------------- <br /> 8 ft 600 psf 0 ft 2 - 3.5 1 - 1.5 <br /> 4 ft 1 - 1.5 0.5 - 0.75 <br /> 16 ft <0.25 <0.25 <br /> L <br /> 1200 psf 0 ft 3 - 4.5 1.5 - 2.5 <br /> 4 ft 1.25 - 2 0.5 - 0.75 <br /> 8 ft 0.5 - 0.75 0.25 - 0.5 <br /> 16 ft 0.25 - 0.4 0.25 - 0.4 <br /> 1800 psf 0 ft 4 - 6 1.5 - 2.5 <br /> 4 ft 1.5 - 2.5 1 - 1.5 <br /> 8 ft 0.75 - 1.25 0.5 - 0.7 <br /> 16 ft 0.35 - 0.5 0.35 - 0.5 <br /> ----------------------------------------------------------------------------------------------------- <br /> 20 ft 600 psf 0 ft - - <br /> 4 ft 1.5 - 2.5 0.75 - 1.25 <br /> 8 ft 1 - 1.5 0.5 - 0.75 <br /> 12 ft - 0.5 - 0.75 - <br /> 16 ft <0.25 <0.25 <br /> NOTE: Settlements are in addition to settlement due to grade raise. <br /> Estimates for rectangular footings can be approximated by square footing with an equivalent <br /> area. <br /> ESTIMATED SETTLEMENT DUE TO INDIVIDUAL SQUARE FOOTINGS <br /> San Joaquin Site 3058 <br /> McCLELLAND CONSULTANTS Plate 43 <br />