AgdaPkt 2005-11-14 - Laserfiche WebLink

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Z4 - /7 a) Expose people or structures to potential substantial adverse effects, including the risk ofloss, injury, or death involving: The project would not create new geologic hazards that could damage project facilities. Therefore, this section focuses on the effect of local geologic conditions and activity on the proposed multi-purpose facility. 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. The project area is located within the seismically active San Francisco Bay Area. The significant earthquakes that occur in the Bay Area are generally associated with crustal movement along well-defined, active fault zones of the San Andreas Fault system, which trend in a northwesterly direction. The project site is located about three (3) miles southeast of the San Andreas Fault. Two other major active faults in the area are the Haywardfault, located about seventeen (17) miles northeast of the project site, and the San Gregorio fault, located about eleven (ii) miles southwest. The project site is not within an Alquist-Priolo Earthquake Fault Zone, and no known surface expression of active faults is believed to cross the site. Therefore. the potential for fault rupture through the site is considered to be low. in addition, there are no known unique geologic or physical features present in the project vicinity. x ii) Strong seismic ground shaking? Strong ground shaking can be expected at the site during moderate to severe earthquakes in the general region. This is common to virtually all developments in the San Francisco Bay Area. Due to the fact that no structures are proposed as a part of the re-zoning of the subject parcels there is no need to mitigate seismic-related hazards at the site. Any future development on the site will be subject to review and approval by the City and shall be designed and constructed in accordance with seismic standards adopted by the City of Redwood City. implementation of these measures would reduce impacts from seismic ground shaking and other activities to a less than significant level. iii) Seismic-related ground failure, including liquefaction? Liquefaction is a process whereby strong ground shaking causes loose, saturated, unconsolidated sediments to lose strength and behave as a fluid. Soils most susceptible to liquefaction are clean, loose, saturated, uniformly graded, fine-grained sands. The site is underlain by layers of silty clays, sands and gravels, and bedrock; therefore, the soils are not susceptible to significant liquefaction and densification during earthquake loading. x x 8