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(-_) �_ <br /> Potential Potential <br /> o <br /> Significance Significance <br /> Without Mitigation With N a <br /> Impacts Mitigation Mitigation Measures Responsibility Mitigation N, o <br /> 0 0 <br /> for Evaluating and Mitigating Seismic Hazards in n <br /> California(pertaining to liquefaction)--would reduce <br /> the potential effects of ground shaking to a less- <br /> than-significant level. <br /> Impact 11-4: Encountering Groundwater in Bay S Mitigation 11-4: Require that the detailed, design- Applicant LS <br /> Mud During Excavation. Excavation for the level geotechnical investigations recommended <br /> proposed project's below-grade installations, such under Mitigations 11-1 and 11-2 include analyses of <br /> as utilities, might be difficult due to the high groundwater and Bay mud within the limits of all <br /> groundwater and relatively shallow depth of the foundation and utility construction. The analyses <br /> weak Bay mud. This condition represents a shall make recommendations regarding dewatering <br /> potentially significant impact. techniques, slope and shoring requirements for <br /> excavations, buffer zones for construction equipment <br /> near slope edges, the potential for requiring light <br /> grading equipment, subgrade remediation <br /> techniques, and the use of excavated fill. Project <br /> grading and construction plans shall incorporate the <br /> results and recommendations of these analyses. In <br /> general, these recommendations are expected to <br /> include, but not be limited to, the following <br /> provisions: <br /> • Soil excavated from below the water level would <br /> be saturated and would require drying before it <br /> can be used as fill. Continuous dewatering of <br /> excavations might be required. <br /> • The sides of the excavations should be sloped <br /> or shored to minimize ground movements; <br /> steep cuts are not possible in Bay mud unless <br /> shoring is used. Typically, when excavation <br /> extends into Bay mud,4:1 or flatter slopes are <br /> co <br /> required to reduce movements. <br /> m <br /> • Keep construction equipment away from the <br /> edges of slopes in order to reduce vibration co D <br /> D <br /> S = Significant _ <br /> LS = Less than significant j -OD <br /> SU = Significant unavoidable impact <br /> NA = Not applicable <br /> T:I10695 Pete's Harbor EIR Addendumlrevised addendum no 2ITable 1-1(10695-01).doc <br />