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City of San Leandro 14143-14273 Washington Avenue Warehouse Project 64 earthquake that would cause strong ground shaking. Project construction would be required to comply with the seismic safety requirements in the International Building Code, the CBC, and the City of San Leandro Building Code. Compliance with such requirements would reduce seismic ground shaking impacts to the maximum extent practicable with current engineering methods. Therefore, impacts related to strong seismic ground shaking would be less than significant. LESS-THAN-SIGNIFICANT IMPACT a.3. Would the project directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury, or death involving seismic-related ground failure, including liquefaction? c. Would the project be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction, or collapse? Soils that are most susceptible to liquefaction are clean, loose, uniformly graded, saturated, fine- grained sands that lie close to the ground surface. The project site is identified as having Clear Lake clay, which are defined as poorly-drained and fine-textured (NRCS 2018b). The project site is located in an identified liquefaction zone, according to maps prepared by CGS (CGS 2016). Most land in San Leandro is underlain by materials that have moderate to very high liquefaction potential. In addition, according to the USGS the project site is in an area that experiences moderate liquefaction susceptibility (USGS 2019). However, the proposed structure would be required to be constructed in compliance with the California Building Code (CBC), which requires structures to be designed and constructed to resist liquefaction potential from seismic-related ground failure. The geotechnical investigation prepared for the project (Appendix G) analyzed the potential for liquefaction induced settlements, and provided recommendations for the design of the proposed structure’s foundation. Recommendations for the proposed structure’s foundation include the removal of existing fill, exploration test pits to determine depth of fills prior to grading, subgrade stabilization measures including scarification and drying. Pursuant to SLMC Section 7-5-100, the City of San Leandro adopted the CBC; Section 1803.1.1.3 of the CBC states that the building department of each locality (in this case the San Leandro Building & Safety Division) would need to approve the soil investigation or geotechnical investigation (Appendix G) if it determines that the recommended action is likely to prevent structural damage. As a condition of the building permit, the approved recommended action would be incorporated into project construction. Therefore, pursuant to the SLMC and the CBC, the recommendations included in the geotechnical investigation (Appendix G) would be incorporated into the design of the project and verified by the City prior to issuance of a building permit. With adherence to SLMC, the CBC, and implementation of recommendations in the design-level geotechnical investigation, impacts would be less than significant. LESS-THAN-SIGNIFICANT IMPACT