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Section 5.0 <br /> Engineering Analyses and Recommendations <br /> �y <br /> 5.6 Additional Studies <br /> _ As mentioned previously,removal of the soil and external hydrostatic forces within <br /> the temporary excavation will remove lateral support for the pump station and wet <br /> pit. A structural engineer should evaluate the impact and develop specific <br /> conclusions and recommendations for these structures. <br /> As described previously,our exploration borings encountered 10 to 15 feet of loose <br /> sands and gravels near the base of the pump station. The field data we obtained <br /> suggest that this layer is susceptible to liquefaction during a moderate'earthquake. <br /> Liquefaction would lead to differential settlement of the pump station and associated <br /> structures and piping that could interrupt operations for days or montihs as repairs, <br /> are made. However,our field investigation program was not designed to gather the <br /> additional data required to make a more detailed evaluation of the risk of liquefaction <br /> and potential for damage. Therefore,we recommend the City consider performing'a <br /> liquefaction study. <br /> S <br /> �r <br /> CDM camp Drerss=&McKee Ina 5-5 <br /> 4:Q5W0 29248-GEO-74-ReoOrtlBrookside Pump Station,doc <br />