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City of Pleasanton—Hidden Canyon Residences and Preserve Draft EIR Geology, Soils, and Seismicity FirstCarbon Solutions 3.6-35 https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec03-06 Geology.docx Level of Significance After Mitigation Less than significant impact. 3.6.7 - Cumulative Impacts This analysis evaluates whether the impacts of the proposed project, together with the impacts of cumulative development, could result in a cumulatively significant impact with respect to geology and soils. This analysis also considers whether incremental contribution of impacts associated with the implementation of the proposed project would be significant. If both conditions apply, this analysis will then evaluate feasible cumulative mitigation that would reduce cumulative effects. If one or both conditions do not apply, cumulative impacts would be less than significant, and no cumulative mitigation is necessary. If there is no impact associated with respect to a particular CEQA threshold, the proposed project would have no contribution to potential cumulative impacts, and therefore, further discussion of cumulative impacts is not required. The geographic scope of the cumulative analysis related to geology and soils includes projects listed in Table 3-1: Cumulative Projects that are in the City of Pleasanton’s jurisdiction within a 0.5-mile radius of the proposed project, as impacts related to geology and soils tend to be localized. Since the proposed project is situated on the outskirts of the City, only one cumulative project is located within an 0.5-mile radius of the proposed project, being the Greek Orthodox Church Project that is approximately 0.45 mile north of the project site. Seismic-related Hazards As previously mentioned, impacts related to geology and soils tend to be site-specific, therefore the relevant geographic scope is limited to the 0.5-mile radius of the proposed project site. The only cumulative project within an 0.5-mile radius of the proposed project is the Greek Orthodox Church Project. Both the proposed project and the Greek Orthodox Church Project are located on the same geologic units and have the same approximate distance from the identified major fault lines. As such, neither project is located in a Special Study Area defined under the Alquist-Priolo Earthquake Fault Zoning Act. Although both the proposed project and Greek Orthodox Church Project may be susceptible to strong seismic shaking, both projects would be required to follow the same seismic safety and structural design requirements from the CBC, and goals, policies, and programs within the General Plan such as Policy 2, Program 2.1, 2.2, and 5.1. In addition, the main development area within the project site that is not located in proximity to Devany Creek has a low liquefaction potential. The Web Soil Survey from the USDA NRCS indicates the Greek Orthodox Church Project to be underlain by the Diablo clay series which consists of soils with a cohesive texture and not unconsolidated saturated sands that are associated with liquefaction, and the Greek Orthodox Church Project is neither in a Liquefaction Zone or Landslide Zone of Required Investigation as delineated by the CGS. As such, the Greek Orthodox Church Project’s cumulatively considerable impact in concurrence with the proposed project related to seismically induced liquefaction and landslides would have a less than cumulatively considerable impact. Overall, since both the proposed project and Greek Orthodox Church Project are not located in a Special Study Area, both projects would be required to incorporate minimum CBC standards and General Plan goals and policies, and the Greek Orthodox Church Project is not located in a Liquefaction or Landslide Zone of