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City of Pleasanton—Additional Housing Sites Rezonings Project <br />Addendum CEQA Guidelines Section 15164 Addendum <br /> <br /> <br />78 <br />erosion is dependent on individual site locations and on-site conditions during <br />construction. As such, because there are no specific projects being <br />proposed, it would be too speculative at this time to determine impacts at <br />individual sites. However, future development projects would be required to <br />prepare a Geologic Report by a registered civil engineer and/or a registered <br />geologist, depending on the site characteristics.5 Further, all new <br />development would be required to comply with the General Plan and <br />Municipal Code, as well as with mandatory NPDES permit requirements, as <br />the proposed sites are over the 1-acre threshold. General Plan Program 6.2 <br />requires developers to include erosion mitigation, and Program 6.3 requires <br />irrigation systems to be developed to minimize the potential for soil saturation <br />and excessive runoff. Additionally, Municipal Code Chapter 20.08 regulates <br />grading activities, including drainage and erosion control. Therefore, impacts <br />would be less than significant, and the proposed project would not result in a <br />new or more severe adverse impact that was not previously identified and <br />disclosed in the Prior FEIR. No further analysis is required. <br />c) Unstable Geologic Location <br />Would the project: Be located on a geologic unit or soil that is unstable, or that would <br />become unstable as a result of the project, and potentially result in <br />on- or off-site landsliding, lateral spreading, subsidence, <br />liquefaction, or collapse? <br />Summary of Prior FEIR <br />The Prior FEIR identified that development within the City could be subject to <br />geologic hazards, including liquefaction, landslides, lateral spreading, and <br />subsidence/settlement. The Prior FEIR noted that, while potentially unstable <br />soils may occur in the City, compliance with applicable CBC requirements, <br />Municipal Code provisions, and General Plan policies would reduce risks <br />associated with geologic hazards to a less than significant level. <br />Proposed Project Analysis and Conclusion <br />As determined through the California Geological Survey (CGS) Seismic <br />Hazards Program Liquefaction Zones Map, Site B is located within an area <br />susceptible to liquefaction. Sites A and C are not located within areas <br />susceptible to landslide or liquefaction. As stated above, future projects at <br />the sites would be required to prepare a site-specific Geotechnical Study <br />and adhere to its recommendations. Furthermore, individual projects would <br />be required to adhere to applicable CBC, Municipal Code requirements, <br /> <br />5 City of Pleasanton. Municipal Code. Chapter 17.12 Geologic Hazards. Website: <br />https://ecode360.com/43030753. Accessed December 15, 2025.