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City of Pleasanton—Hidden Canyon Residences and Preserve Project CEQA Findings of Fact and Statement of Overriding Considerations 36 FirstCarbon Solutions Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/FOF/21480016 Pleasanton Hidden Canyon Residences and Preserve Project FOF.docx The Lead Agency finds that MM GEO-1 is feasible, is adopted, and will further reduce impacts related to seismic-induced ground failure and landslides. Accordingly, the Lead Agency finds that, pursuant to Public Resources Code Section 21081(a)(1) and CEQA Guidelines Section 15091(a)(1), changes or alterations have been required in, or incorporated into, the proposed project that mitigate or avoid the potentially significant impacts as identified in the EIR. Therefore, impacts associated with seismic-induced ground failure and landslides would be less than significant with mitigation incorporated. 1.6.10 - Impact GEO-3: On-Site Landslides and Collapse Impact GEO-3: The proposed project would not 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. Findings: Less than significant impact with mitigation incorporated. (Draft EIR, p. 3.6-31). Changes or alterations have been required in, or incorporated into, the project which avoid or substantially lessen the significant environmental effects as identified in the EIR. (CEQA Guidelines § 15091(a)(1)). Mitigation Measures Implement MM GEO-1. Facts in Support of Findings: The majority of the project site is underlain by a thin layer of colluvium and residual soil with stiff clays and no groundwater, indicating a low potential for liquefaction in the main development area. Since the northern and southeastern sections of the project site have topographic and subsurface conditions that indicate potential for landslides and liquefaction, additional loading resulting from structures proposed in these areas may result in soils becoming unstable, with the potential to induce landslides or liquefaction. (Draft EIR, p. 3.6-29). The main development area of the project site encompassing the 28 proposed single-family homes, contains characteristics of collapsible soil consisting of sand and silt-sized particles held together by clayey material. (Draft EIR, p. 3.6-30). Since additional wetting from naturally occurring rainwater or leakage of water lines beneath these structures could result in compression and eventual collapse, the proposed project may result in potentially significant impacts with respect to on-site landslides and collapse. (Draft EIR, pp. 3.6-29 to 3.6-30). To address this, the proposed project would be required to implement MM GEO-1 (Draft EIR, p. 3.6-30). Implementation of MM GEO-1 would include extensive on-site and laboratory testing for on-site soil properties including boring, trenching, and in situ standard-penetration tests. The qualified Geotechnical Engineer would also be required to provide recommendations for in site plans and design features that would reduce potential impacts associated with unstable soil conditions to the extent feasible, in accordance with the California Building Standards Code (CBC) guidelines. (Draft EIR, p. 3.6-30). Therefore, implementation of MM GEO-1 would ensure that impacts of the proposed project related to substantial direct or indirect risks associated with on-site landslides or collapse remain less than significant. The Lead Agency finds that MM GEO-1 is feasible, is adopted, and will further reduce impacts related to on-site landslides and collapse. Accordingly, the Lead Agency finds that, pursuant to Public