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City of Pleasanton—Vineyard Avenue Residential Project <br />Consistency Checklist 15183 Consistency Checklist <br /> <br />88 <br /> <br />applicable policies, regulations, and standards set forth by the State and the <br />City of Pleasanton. Therefore, impacts related to subsidence/settlement <br />would be less than significant and the proposed project would not result in <br />any effects that would require further CEQA review for this topic. <br />d) Expansive Soils <br />Would the project: Be located on expansive soil, creating substantial direct or indirect <br />risks to life or property? <br />Summary of Housing Element Update FEIR <br />The Housing Element Update FEIR indicated new development constructed <br />on expansive soils could be subject to damage or become unstable when <br />underlying soil shrinks or swells. The actual presence and extent of expansive <br />soils can only be determined as part of site-specific soils and geologic <br />reports. <br />The Housing Element Update FEIR concluded that compliance with California <br />Building Standards Code, applicable Municipal Code requirements, as well <br />as goals, policies, and programs included as part of the General Plan, and <br />the Vineyard Avenue Corridor Specific Plan (as applicable) would ensure <br />that potential impacts associated with expansive soils would be less than <br />significant. <br />Proposed Project Analysis and Conclusion <br />Expansive soils increase in volume when they absorb water and have the <br />potential to crack or otherwise compromise the integrity of building <br />foundations. <br />As part of the Geotechnical Investigation Report, Aftershock performed three <br />Plasticity Index (PI) tests on representative samples of on-site soils. The results <br />of the PI tests indicated PIs ranging between three and six, indicating low <br />expansion potential. In addition, compliance with all applicable CBSC <br />standards would ensure the structural integrity of the proposed structures. <br />Furthermore, final building design and on-site construction would be <br />completed in conformance with the recommendations of the design-level <br />Geotechnical Investigation required by General Plan policies. The City of <br />Pleasanton Building and Safety Division would review all improvement plans <br />to ensure that all recommendations from the design-level Geotechnical <br />Investigation are incorporated. <br />Based on the above, impacts related to substantial direct or indirect risks to <br />life or property related to being located on expansive soil, as defined in Table