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I <br />Report of Soils Investigation <br />2215 South Standard Ave., Proposed Addition <br />Santa Ana Califomia <br />Page 1of27 <br />Job No. 40-0613 <br />Aoril 5. 1999 <br />I <br />-t <br />1.0 INVESTIGATION SUMMARY <br />The investigation was perlormed to provide site-specific geotechnical information for the <br />proposed construction of an approximately 27,000 square foot concrete tilt-up structure <br />and associated improvements at the subj ect site. Our investigation found that the <br />proposed building pad areas are underlain by Quaternary alluvium and colluvium to the <br />maximum explored depth of 50 feet below the ground surface (fbg). <br />Groundwater was encountered at a depth of approximately 22 fbg at the subject site but <br />has been reported to have been as shallow as 8 fbg. Groundwater levels will likely <br />fluctuate during periods of precipitation, and are not expected to directly impact <br />foundation soils but will likely contribute to liquefaction during the predicted seismic <br />event <br />With respect to gmlogic and seismic hazards, the site is considered as safe as any within <br />the general Orange County area. Orange County is an area of moderate to high seismic <br />risk. Based on observed geologic conditions and available literature, no active surface <br />faults are known to exist within the site. The site is not within an earthquake study zone; <br />therefore, the possibility of surface rupture at the site due to faulting should be considered <br />low. The site could be subject to ground shaking in the event ofa major earthquake on a <br />distant fault. The site lies in an area of moderate to high seismic risk as does all of <br />Southern California and special design considerations must be made. <br />1 <br />I <br />l <br />:1 <br />l <br />-t <br />J <br />)