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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 /> • Hinge exterior slabs and ramps attached to .A n <br /> buildings in order to protect against breakage <br /> caused by differential settlement between the <br /> buildings and the outside ground. <br /> • If settlements are found to be excessive, <br /> consider a surcharge program to reduce the <br /> effects of settlement. Surcharging consists of <br /> placing excess fill in areas where settlements <br /> are a concern and leaving it in place a sufficient <br /> amount of time to partially pre-consolidate the <br /> underlying compressible soil. <br /> Implementation of these measures would reduce this <br /> potential impact to a less-than-significant level. <br /> Impact 11-3: Ground Shaking/Liquefaction. S Mitigation 11-3: Require that the detailed, design- Applicant LS <br /> Development of the proposed project would place level geotechnical investigations recommended <br /> new residences in a subregion that is expected to under Mitigations 11-1 and 11-2 include analysis of <br /> experience severe earthquake-induced ground project site seismic stability, evaluation of <br /> shaking during the useful life of the project liquefaction potential, and soil response <br /> improvements. This ground movement could also characteristics with respect to ground acceleration. <br /> cause differential settlement of poorly consolidated <br /> soils(including Bay mud)and induce ground failure The detailed, design-level geotechnical <br /> within alluvial soils that are prone to liquefaction investigations should include the following: <br /> (including some layers below Bay mud). These <br /> possible responses to anticipated seismic activity • Seismic stability analysis of the existing on-site <br /> represent a potentially significant impact. soil, including fill, Bay mud, and underlying <br /> alluvial deposits; <br /> • Evaluation of liquefaction potential through the <br /> performance of additional borings, cone <br /> co <br /> penetration tests, and/or equivalent methods; <br /> and m <br /> a <br /> m <br /> CO D <br /> D <br /> S = Significant _ <br /> LS = Less than significant j -OD <br /> SU = Significant unavoidable impact <br /> I, Du <br /> NA = Not applicable <br /> T:I10695 Pete's Harbor EIR Addendumlrevised addendum no 21Table 1-1(10695-01).doc <br />