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City of Pleasanton—Hidden Canyon Residences and Preserve Geology, Soils, and Seismicity Draft EIR 3.6-24 FirstCarbon Solutions https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480016/EIR/3 - Draft EIR/21480016 Sec03-06 Geology.docx other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. ii. Strong seismic ground shaking. iii. Seismic-related ground failure, including liquefaction. iv. Landslides. b) Result in substantial soil erosion or the loss of topsoil. c) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the proposed project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction or collapse. d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating substantial direct or indirect risks to life or property. e) Have soils incapable of adequately supporting the use of septic tanks or alternative wastewater disposal systems where sewers are not available for the disposal of wastewater. f) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature. 3.6.6 - Project Impacts and Mitigation Measures This section discusses potential impacts associated with the proposed project and provides mitigation measures where necessary. Earthquakes Impact GEO-1: The proposed project would not directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury or death involving: i) Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. ii) Strong seismic ground shaking. iii) Seismic-related ground failure, including liquefaction. iv) Landslides. Impact Analysis Construction and Operation i) Fault Rupture The project site is located in an area of high seismicity, as is all the San Francisco Bay Area. The project site is traversed by northwest trending fault lines with one subsidiary fault south of the project site. However, the fault lines on the project site cut through Tertiary rock units and do not transect Quaternary rock units younger than 11,000 years old. As such, the fault lines on the project site are considered inactive and are not designated within a Special Study Zone under the Alquist- Priolo Fault Zoning Act. The closest Special Study Zone is along the Calaveras Fault, which is