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Lutzky Associates Development, LP - Geoteclinical Investigation <br />MACTEC Project 4953-03-2631 <br />September 1 8.2003 <br />potential for surface rupture at the site due to fault plane displacement propagating to the ground <br />surface during the design life of the project is considered low. Although the site could be subjected <br />to strong ground shaking in the event of an earthquake, this hazard is common in Southern Cali fornia <br />and the effects of ground shaking can be mitigated by proper engineering design and construction in <br />conformance with current building codes and engineering practices. <br />The site is relatively level and the absence of nearby slopes precludes slope stability hazards. The <br />potential for other geologic hazards such as tsunamis, inundation, seiches, flooding, and subsidence <br />affecting the site is considered low. <br />We recommend that the proposed Data Center be supported on pile foundations considering the <br />soft fine-grained soils beneath the site and the expected column loads. However, if the anticipated <br />static settlements and liquefaction-induced settlements can be accommodated, the proposed Data <br />Center may be supported on shallow spread type foundations. The anticipated static settlements <br />could be minimized by surcharging the entire footprint of the project area as described in the <br />grading section o f this report. <br />Because of the expansive on-site clayey soils, mitigation measures will be required to prevent <br />heaving of floor slabs and other concrete slabs-on-grade. <br />Prior geotechnical investigation in the vicinity of the project site by Geotechnical Professionals <br />Inc. (1997) indicates that on-site soils are severely corrosive to ferrous metals, and deleterious to <br />concrete. <br />Vll