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SAN LEANDRO SHORELINE DEVELOPMENT EIR ADDENDUM PROJECT CITY OF SAN LEANDRO Page 32 PlaceWorks The Certified EIR notes that within the project site, lateral spreading could be a risk along the channel margins created by the dredged channels inside and outside of the marina and adjacent fill dikes. This was considered a significant impact in the Approved Project and would be mitigated by mitigation measures GEO-3a, b, and c. These same measures would be required under the Modified Project, and thus would not have differential impacts or differential magnitude of existing impacts regarding the risk of lateral spreading, subsidence, liquefaction, or collapse. As with the Approved Project, Mitigation Measure GEO-4, requiring that a geotechnical engineer make specific recommendations to mitigate expansive soils under pavements and structures based on the testing of the in-site fill materials would be required under the Modified Project, and would not result in any new impacts or a significant increase in existing impacts related to expansive soils. The Certified EIR for the Original Project determined that the proposed development would not require the use of septic tanks or alternative wastewater systems, and that all wastewater would be discharged into the existing public sanitary sewer system serviced by the City of San Leandro. This remains the case for the Modified Project, therefore, the Modified Project would not result in any new impacts or a significant increase in existing impacts related to the capacity of soils to adequately support the use of septic tanks. The Certified EIR found that the project site is not an identified prehistoric site, however, in the event that fossils or fossil-bearing deposits are discovered during construction, the project would implement Mitigation Measure CULT-3 (in the Cultural Resources chapter of the original Certified EIR). Implementing this measure would also ensure that the Modified Project has a less than significant impact and, therefore, would not constitute a different impact or a significant increase in impacts compared to the Original Project in terms of significant or unique paleontological and geological resources.