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Gri#in Realry SA, Inc.-Geotechnical Investigation <br />Law/Crandall Project 70131-7-0261.0001 <br />July 8, 1997 <br />SUMMARY <br />We have completed our geotechnical investigation of the site of the proposed Planning and <br />Building Agency building in Santa Ana, California for Griffin Realty SA, Inc. Our subsurface <br />explorations, engineering analyses, and foundation design recommendations are summarized <br />below. <br />We explored the soil conditions by drilling two borings at the site; fill soils, 2 and 3 feet thick, <br />were found in the two borings. The natural soils consist of sandy silt, clayey silt, silty sand and <br />sand. To supplement our current geotechnical analyses, we also reviewed our report of foundation <br />investigation, dated November 7, 1958, for the existing on-site police building which will be <br />demolished. The geotechnical recommendations in this report were developed in part using <br />information from our previous investigation. <br />The existing fill soils are not suitable for support of the proposed building foundations and fioor <br />slab. The natural soils consist primarily of medium stiffsilt, with minor deposits of dense sand and <br />silty sand. The upper natural soils become considerably weaker and more compressible when wet. <br />Water was encountered at depths of 65'h and 67'h feet below the existing grade. <br />To provide support for the proposed building with minimum settlement, drilled cast-in-place <br />concrete piling may be used. We understand that the drilled cast-in-place piles for the existing <br />police building will be left in-place but will not be used for support of the new building. The on- <br />site soils are suitable for use as compacted fill, and the building floor slab can be supported on <br />grade. <br />iv