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k%J KLEI NFELDER <br /> File No. 20-2182-24 <br /> February 20, 1990 <br /> debris encountered in foundation excavations should be <br /> overexcavated and recompacted, free of debris . We recommend <br /> continuous foundations around the perimeter of the structures to <br /> provide a barrier against moisture migration beneath interior floor <br /> slabs . <br /> With the above provisions, the recommended maximum allowable soil <br /> bearing value for the structures is 2, 000 pounds per square foot <br /> for dead plus live loads . This value can be increased by one- <br /> third for the total of all loads, including wind and seismic <br /> forces . The bottom of the foundations should be well tamped to <br /> provide a firm base. If cracks develop in the soil because of <br /> drying, the cracked soils should be sealed by soaking or <br /> sprinkling. In any case, the foundation excavations should be <br /> slightly moistened just prior to placing concrete in order to aid <br /> in its curing. <br /> The recommended minimum width of foundations is 12 inches . We <br /> recommend that the actual foundation design and reinforcement for <br /> the foundations be provided by the structural engineer. We note <br /> that the above-stated bearing pressure is a net value, and the <br /> weight of the concrete in the portion of the foundations which <br /> extends below grade can be neglected in proportioning the <br /> foundations . <br /> We recommend that all foundation excavations on this project be <br /> observed by a representative of our firm prior to placing <br /> 6 <br />