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N WIN KLEINFELDER File No.: 20-3304-01 February 1 , 1990 Page 4 Logs of Borings at the corresponding sample locations. The results of all the tests, excluding the R-Value, are summarized on Plate VIII. The R-Value test results are discussed in the "Pavement Sections" section of this report and are presented on Plate IX. CONCLUSIONS AND RECOMMENDATIONS Foundations We recommend that the structure be supported on spread or continuous foundations bearing on the existing soils or on Engineered Fill. We recommend that foundations for the single-story structure extend a minimum_ depth of 12 inches below the lowest adjacent finished soil subgrade, interior or exterior, whichever controls . In order to provide more uniform support to the foundations, we recommend the loose soils exposed in the foundation excavations be hand compacted prior to placing reinforcing steel. Any loose soil pockets or debris encountered during foundation excavations should be overexcavated and recompacted as described in the "Site Preparation and Grading" section of this report. With these provisions, we recommend a maximum allowable bearing pressure of 2,000 pounds per square foot for dead plus live loads be used in design. This value can be increased by one-third for the total of all loads, including wind and seismic forces. The recommended minimum width of foundations is 12 inches. The anticipated total settlement is less than J-inch. The majority of this settlement should occur during construction as building loads are placed. We recommend that the reinforcing design of the foundations be provided by the structural engineer. We note that the above-stated bearing value is a net value ano the weight of concrete in the portion of the foundations which extends below grade i can be neglected in proportioning the foundations. 1 L