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Pleasanton Gateway Environmental Checklist 6. GEOLOGY AND SOILS Environmental Setting The subject site lies within the Alquist-Priolo Fault Zone3, Seismic Zone 8. The approval of a project by a city or county must be in accordance with policies and criteria established by the State Mining and Geology Board. Cities and counties shall require, prior to the approval of a project, a geologic report defining and delineating any hazard of surface fault rupture. If the city or county finds that no undue hazard of that kind exists, the geologic report on the hazard may be waived, with the approval of the State Geologist. Atter a report has been approved or a waiver granted, subsequent geologic reports shall not be required, provided that new geologic data warranting further investigations is not recorded. Standards of Significance For purposes of this environmental document, an impact is considered significant if the proposed project would: • Result in a project being built that will either introduce geologic, soils, or seismic hazard by al- lowing the construction of the project on such a site without protection against those hazards. Less 'Chan Potentially Significant Less 'Chan Signiticatll Wilh Mitigation Significant No Issues Impact Incorporated Impact Impact Geolo~v and Soils Would the project: a) Expose people or structures to potential substantial ad- ^ ^ ^X ^ verse effects, including the risk of loss, injury, or death involving: i) Rupture of a known earthquake fault, as delineated ^ ^ ^X ^ 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 Ge- ology Special Publication 42. ii) Strong seismic ground shaking? ^ ^ ~ ^ iii) Seismic-related ground failure, including liquefac- ^ ^ X^ ^ tion? iv) Landslides? ^ ^ ^ b) Result in substantial soil erosion or the loss of topsoil? ^ ^ ~ ^ Pleasanton Gateway Initial Study Page 20 of 37 November 8, 2006