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Page 6 - #4220 91-1043 , <br />" Actual structural loadings for the construction are not presently available. However, we <br /> do anticipate that wall and column loadings will be relatively light, <br />-� Our design assumptions include an allowable total settlement of up to 1", and a <br /> minimum safety factor of three with respect to shearing or base failure of the new <br /> foundations. <br /> 3.2 Discussion <br />_ We understand the existing structure was constructed in 1976, and is supported on a <br /> normal spread footing foundation system. Elevations of the existing foundations <br /> L apparently range from about 4' below slab grade in the north to about 10' below slab � <br />_ grade in the south. We understand foundations are supported upon a compacted fill <br /> system placed after excavation of compressible soils in 1976. <br />_ The results of soil observation and internuttent compaction testing performed by our firm <br /> during the original construction in 1976 were available for our review. The associated <br />� report (#9-7112) indicates the bottom of�the original excavation ranged from about 7' <br />_ to 19' below floor elevation. A compacted fill consisting primarily of cohesive clays was <br /> placed to re-establish building grade. Project specifications at the time of this <br />� construction required that compacted fill be compacted to a minimum of 95% of the <br />