Planning Commission meeting agenda packet 7-9-25

City of Pleasanton—Vineyard Avenue Residential Project 15183 Consistency Checklist Consistency Checklist 87 c) Unstable Geologic Location 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 landsliding, lateral spreading, subsidence, liquefaction, or collapse? Summary of Housing Element Update FEIR The Housing Element Update FEIR indicated that unstable geologic units or soils, including geologic hazards, such as subsidence or collapse, are present. As such, development consistent with the Housing Element Update could occur within areas containing unstable geologic units or be located on soils that are unstable or could become unstable from such development. The Housing Element Update FEIR concluded that compliance with California Building Standards Code, applicable Municipal Code requirements, as well as goals, policies, and programs included as part of the General Plan, and the Vineyard Avenue Corridor Specific Plan (as applicable) would ensure that potential impacts associated with development on unstable geologic units or unstable soils would be less than significant. Proposed Project Analysis and Conclusion Subsidence is the settlement of soils of very low density generally from either oxidation of organic material, or desiccation and shrinkage, or both, following drainage. Subsidence takes place gradually, usually over a period of several years. As previously discussed, the project site contains undocumented fill at the northern project site boundary, likely originating from the grading of Vineyard Avenue. The Geotechnical Investigation Report determined the undocumented fill would not significantly impact the proposed project. In addition, the CBSC provides standards to protect property and public safety by regulating the design and construction of excavations, foundations, building frames, and other building elements. Compliance with standard construction regulations included in the CBSC would ensure that the proposed project would not directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury, or death involving subsidence or settlement. Furthermore, final building design and construction at the project site would be completed in conformance with the recommendations of a design-level Geotechnical Investigation. The City of Pleasanton Building and Safety Division and Public Works would review all improvement plans to ensure that all recommendations from the Geotechnical Investigation Report are incorporated. The proposed project would be required to comply with all