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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />May 2, 2008 Page 11 <br /> <br />5.4.8 Lateral Spreading <br /> <br />Lateral spreading is the movement of weaker soils toward a free face, or down a slope that is <br />induced by ground shaking during a major earthquake. Recommendations for foundation and <br />pavement design provided in this report are intended to reduce the potential for adverse impacts <br />from lateral spreading. <br /> <br />5.5 SOIL CORROSION POTENTIAL <br /> <br />We submitted select soil samples to an analytical lab for determination of pH and sulfate. The <br />sulfate lab test results indicate that sulfate exposure may be categorized as “Negligible” in <br />accordance with Table 19-A-4 of the California Building Code. For “Negligible” sulfate <br />exposure, the CBC indicates that either Type I or Type II Portland Cement may be used for <br />concrete mix designs for the project. <br /> <br />If further investigation is desired, we recommend a corrosion consultant be retained to determine <br />if specific corrosion recommendations are necessary for the project. We present the analytical <br />lab test results in Appendix B. <br /> <br />6. EARTHWORK RECOMMENDATIONS <br /> <br />The relative compaction and optimum moisture content of soil, rock, and aggregate base referred <br />to in this report are based on the most recent ASTM D1557 test method. Compacted soil is not <br />acceptable if it is unstable. It should exhibit only minimal flexing or pumping, as determined by <br />an ENGEO representative. <br />