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7.B. - Page 70 2 Environmental Analysis <br /> where sewers are not available for the <br /> disposal of waste water? <br /> a)Expose people or structures to potential substantial adverse effects,including the risk of <br /> loss, injury, or death involving: <br /> i)Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo <br /> Earthquake Fault Zoning Map issued by the State Geologist for the area or based on <br /> other substantial evidence of a known fault?Refer to Division of Mines and Geology <br /> Special Publication 42. <br /> The major known faults in the vicinity of the project include the San Andreas Fault (4.5 miles <br /> southwest of project area), the Hayward Fault (13.1 miles northeast of project are), and the San <br /> Gregorio Fault (18.5 miles southwest of project area). Figure PS-1 of the Public Safety Element <br /> of the City General Plan shows the locations of regional fault within the City (City of Redwood <br /> City,2011). The proposed project would not be within an Alquist-Priolo Earthquake Fault Zone <br /> as indicated by Figure PS-1 and PS-2 in the City General Plan (City of Redwood City,2011). <br /> Therefore, there is a low potential for impacts associated with surface ruptures from a known <br /> fault zone. (No Impact) <br /> 11)Strong seismic ground shaking? <br /> A major seismic event on the San Andreas Fault,the fault closest to the project,would result in <br /> strong to very strong seismic ground shaking in the project area. National Earthquake Hazards <br /> Reduction Program (NEHRP) data,provided by the USGS,determined that the estimated peak <br /> ground acceleration (pga) at the site during maximum magnitude earthquakes,having a <br /> 10 percent probability of exceedance within 50 years (a seismic recurrence interval of one event <br /> within 475 years) is approximately 0.59g (CE&G,2013). The joint-use path and pump station are <br /> not considered lifeline facilities,and the recommendations in the CE&G report (Appendix F) do <br /> not require design for this peak acceleration,but include design criteria for the tieback and <br /> retaining walls of the joint-use path. The proposed facilities would be designed in accordance <br /> with the California Building Code,but could experience damage to the project walls, structures, <br /> and underground facilities from this ground shaking. The proposed project would not affect the <br /> integrity of the US 101 freeway bridge. Damage to nonessential facilities such as the proposed <br /> joint use path could be repaired relatively easily and would not result in a significant loss of City <br /> facilities. In the event of damage,the City would close the access gates to the joint-use path so <br /> that the risk to the public from structural damage resulting from seismic ground-shaking would <br /> be less than significant. (Less than Significant Impact) <br /> 111)Seismic-related ground failure,including liquefaction? <br /> Liquefaction occurs when strong ground shaking causes loose, saturated,and unconsolidated <br /> sediments to lose strength and behave in fluid-like characteristics. The alluvium encountered <br /> 2-30 US 101 Pedestrian Undercrossing and Bair <br /> Island Road Storm Drain Pump Station Project <br />