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LEA ASSOCIATES. INC. CEQA INITIAL STUDY/MITIGATED NEGATIVE DECLARATION <br /> MARCH 7011 PREDA STREET PIPE BRIDGES UPGRADE <br /> SAN LEANDRO, CALIFORNIA <br /> Less Than <br /> Significant <br /> Potentially with Less Than <br /> Significant Mitigation Significant No <br /> Impact Incorporated Impact Impact <br /> VI. GEOLOGY AND SOILS. Would the project: <br /> a) Expose people or structures to potential substantial <br /> adverse effects, including the risk of loss, injury, or death <br /> involving: <br /> i) Rupture of a known earthquake fault, as delineated on U • U <br /> the most recent Alquist - Priolo Earthquake Fault <br /> Zoning Map issued by the State Geologist for the area <br /> or based on other substantial evidence of a known <br /> fault? Refer to Division of Mines and Geology <br /> Special Publication 42. <br /> ii) Strong seismic ground shaking? 0 • <br /> iii)Seismic - related ground failure, including U • U <br /> liquefaction? _ <br /> iv) Landslides? U 0 • U <br /> b) Result in substantial soil erosion or the loss of topsoil? O U <br /> c) Be located on a geologic unit or soil that is unstable, or U ❑ • ❑ <br /> that would become unstable as a result of the project, and <br /> potentially result in on- or off -site landslide, lateral <br /> spreading, subsidence, liquefaction or collapse? <br /> d) Be located on expansive soil, as defined in Table 18 -I -B U ❑ • O <br /> of the Uniform Building Code (1994), creating <br /> substantial risks to life or property? <br /> e) Have soils incapable of adequately supporting the use of ❑ U U • <br /> septic tanks or alternative waste water disposal systems <br /> where sewers are not available for the disposal of waste <br /> water? <br /> Affected Environment: <br /> Geology. The project is located within the Coast Ranges Geomorphic Province, a relatively <br /> geologically young and seismically- active region on the western margin of the North American plate. <br /> In general, the Coast Ranges comprise a series of discontinuous north -west trending mountain ranges <br /> and ridges composed of sedimentary bedrock with layers of recent alluvium filling the intervening <br /> valleys. United States Geological Survey (USGS) mapping indicates that the project site is underlain <br /> by Quaternary -aged alluvial fan deposits (Helley et al. 1997). These soils were deposited by years of <br /> erosion from the East Bay Hills and are characterized by layers of silt and clay. <br /> P:1EGI080110EQA\Preda_FINAL_IS- MND.doc (03/28/11) 27 <br />