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MainPlace Mall Transformation Project 12126.001 <br />2016 CBC Spectral Acceleration Parameters <br />Categorization/Coefficient <br />Site Latitude <br />33.77550 <br />Site Longitude <br />-118.86970 <br />Site Class <br />D <br />Mapped Spectral Response Acceleration at Short Period (0.2 sec), Ss <br />1.478g <br />Mapped Spectral Response Acceleration at Long Period (1 sec), S1 <br />0.540g <br />Short Period (0.2 sec)Site Coefficient, Fa <br />1.0 <br />Long Period (1 sec) Site Coefficient, Fv <br />1.5 <br />Adjusted Spectral Response Acceleration at Short Period (0.2 sec), SMs <br />1.478g <br />Adjusted Spectral Response Acceleration at Long Period (1 sec), SMi <br />0.810g <br />Design Spectral Response Acceleration at Short Period (0.2 sec), SDs <br />0.985g <br />Design Spectral Response Acceleration at Long Period (1 sec), SD1 <br />0.540g <br />Mapped Geometric Mean MCEG Peak Ground Acceleration, PGA <br />0.530g <br />Site Coefficient, FPGA <br />1.0 <br />PGA adjusted for Site Class, PGAM = FPGA'PGA <br />0.530g <br />By deaggregating the peak ground acceleration with respect to magnitude and <br />distance, the MCE at the site will most likely a magnitude 6.9 event occurring <br />approximately 7.6 miles from the site (USGS, 2008b). See Appendix E, Site <br />Seismology Parameters. <br />3.3 Liquefaction Potential <br />As shown on the State of California Seismic Hazard Zones Map for the Orange <br />Quadrangle (CGS, 1998), the southernmost portion of the project site is located <br />within an area that has been identified by the State of California as being <br />potentially susceptible to liquefaction (Figure 5, Seismic Hazard Map). This <br />generally coincides with the portion of the project site where the historically <br />shallowest groundwater depth is between 30 and 40 feet bgs (CGS, 1997). <br />Evaluation of the liquefaction potential was performed using the soil profile and <br />blow counts data obtained from Boring LB-1 (the only boring located in the <br />liquefiable zone) using computer software LiquefyPro. Based on results of our <br />evaluation, liquefaction potential for granular site soils exists at depth of <br />approximately between 30 and 35 feet bgs. With similar soil profile and blow <br />counts characteristics observed in Borings LB-2 and LB-8 at the site north of the <br />8 9 <br />Leighton <br />