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J. H. KLEINFELDER & ASSOCIATES File No. 20-2925-01 <br /> June 16, 1987 <br /> Page 4 <br /> sample locations and are summarized on Plate VII. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Foundations <br /> We recommend that the structures be supported on spread or continuous <br /> foundations bearing on the native soils or Engineered Fill. We recommend that <br /> footings extend a minimum depth of 12 inches for one-story and 18 inches for two- <br /> story structures below the lowest adjacent finished soil subgrade, interior or exterior, <br /> whichever controls. If loose soil pockets are encountered, they should be <br /> overexcavated and recompacted as described in the "Site Preparation and Grading" <br /> section of this report. <br /> With these provisions, we recommend a maximum allowable bearing pressure of <br /> 2,000 pounds per square foot for dead plus live loads be used in design. This value <br /> can be increased by one-third for the total of all loads, including wind or seismic <br /> forces. The recommended minimum width of foundations is 12 inches. The anticipated <br /> total settlement is less than 1-inch. The majority of this settlement should occur <br /> during construction as building loads are placed. <br /> We recommend that the reinforcing design of the footings be provided by the <br /> structural engineer. We note that the above-stated bearing value is a net value and <br /> the weight of concrete in the portion of the foundations which extends below grade <br /> can be neglected in proportioning the foundations. <br /> It is recommended that all footing trenches on this project be observed by a <br /> representative of our firm prior to placement of reinforcing steel. The purpose of <br /> these observations is to verify that the bearing soils actually encountered in the <br /> footing excavations are the same as those on which our recommendations are based, <br /> and to observe any loose pockets of soil. <br />