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Lutzky Associates Development. LP - Geolechnical Investigation <br />MACTEC Project 4953-03-2631 <br />September 18,2003 <br />1.0 SCOPE <br />This report provides the results of our geotechnical investigation for a proposed Data Center to be <br />constructed near Columbine Avenue and Halladay Street in Santa Ana, California. The location of <br />the site is shown on Figure 1, Vicinity Map. Our subsurface explorations, engineering analyses, <br />and geotechnical design recommendations are summarized below. The locations of the proposed <br />structures and our current and prior exploration borings are shown on Figures 2.1 and 2.2, which <br />are titled Plot Plan and Boring and CPT Location Plan, respectively. <br />This investigation was authorized to determine the static physical characteristics of the soils at the <br />site and to provide recommendations for foundation design, design of walls below grade, and floor <br />slab and earthwork for the proposed development. We were to evaluate the existing soil and <br />ground water conditions at the site, and provide the following: <br />• Results of the subsurface explorations and laboratory tests, with a description <br />of the soil and groundwater conditions encountered; <br />• Results of the geologic-seismic hazard evaluation; <br />• Recommendations for design of foundations to be used for support of the <br />proposed Data Center, including allowable increase for wind or seismic loads; <br />• Estimated settlements for the anticipated loadings; <br />• Recommended site coefficient and seismic zonation based on the current <br />California Building Code; <br />• Results ofa liquefaction evaluation of the site; <br />• Results of ground motion studies; <br />• Recommendations for design of walls below grade; <br />• Recommendations regarding frictional and passive values for the resistance of <br />lateral forces; <br />• Recommendations for earthwork, including site preparation, excavation, and <br />the placing of any required compacted fill; and <br />• Recommendations for floor slab support. <br />1