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Orange County, California, 1998). Results of the analyses indicate that a safety factor <br />against liquefaction of less than 1.3 is present at a depth of 15 to 20 feet and 25 to 30 feet <br />(B-1). The historic high groundwater depth of 5 feet was used in the calculations. <br />A simplified method proposed by Tokimatsu and Seed (1987) involving SPT UN"-Values <br />was used to estimate earthquake induced soil settlement at liquefiable zones. <br />Since materials encountered in the upper 19 to 23 feet were predominantly dense fills with <br />relatively high in-place densities orcohesive alluvial materials, the potential for the surface <br />manifestation at the subject site is considered very low (Ishihara, 1985). <br />LABORATORY TESTING <br />General <br />As previously indicated, laboratory tests were performed on representative samples of the <br />onsite earth materials collected for the present geotechnical investigation, primarily in <br />order to evaluate their physical characteristics and engineering properties with respect to <br />anticipated site development. The test procedures used and subsequent results are <br />presented below: <br />Field Moisture and Densitv <br />Field moisture content and dry unit weight were determined for relatively "undisturbed" <br />samples of earth materials obtained from GSI's exploratory excavations. The dry unit <br />weight was determined in pounds per cubic foot (pcf) and the field moisture content was <br />determined as a percentage of the dry weight. Water contents were measured in general <br />accordance with ASTM D-2216. Results of this testing are summarized on the logs in <br />Appendix B. <br />Consolidation Testing <br />Consolidation testing was performed on a selected undisturbed sample. Testing was <br />performed in general accordance with ASTM Test Method D-3080. Test results are <br />presented in Appendix C. <br />Expansion Index <br />Representative samples of soil near surface grade were tested for expansivity. The <br />expansion index (El) test was performed according to UBC Standard #18-2, as outlined <br />in Section 1803 of the 1997 Uniform Building Code (UBC). Laboratory test results indicate <br />that the soil expansion potential for the on-site soils are low to high (El= 22 and 98). <br />Pacific Development Group <br />1307 West Sunflower Avenue, Santa Ana <br />File:\server\andree\4900\497631.foundshopctr <br />GeoSoils, Inc. <br />W.O. 4976-Al-OC <br />November 2,2005 <br />Page 6