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tested to determine its Atterberg Limits {ASTM D 4318-10) to aid in engineering classification of <br />soil, two samples were tested for grain size distribution (ASTM D 422-63/07; D 1140-00/06) to <br />aid in soil classification and to measure the percentage of silt and clay fractions, and two samples <br />were tested for consolidation (ASTM D 2435/D2435M-1L) to aid in settlement analysis. Copies <br />of the geotechnical laboratorytest results are included in Appendix B and are presented on the <br />logs of soil borings corresponding to sampling depths. <br />One near surface sample was tested for corrosion potential. The corrosion test results are <br />included in Appendix D. <br />4.0 DATA ANALYSIS <br />Subsu rface Soil Classification <br />Based on the data acquired during our subsurface investígation (See Appendix A), the site is <br />assigned to Site Class E ("soft clay soil") as defined by Table 20.3-L of the ASCE 7-10. Type E soils <br />include any profile with more than L0 feet of soil having Plasticity lndex of greater than 20, <br />moisture content greater than 40 percent, and undrained shear strength of less than 500 psf. <br />Seismic Design Parameters <br />The following seismic design parameters represent the general procedure as outlined in Section <br />1613 of the California Building Code and in ASCE 7. The values determined below are based on <br />the 2009 National Earthquake Hazard Reduction Program (NEHRP) maps and were obtained using <br />the United States Geological Survey's Design Maps Web Application. <br />Summary of Seismic Parameters - CBC 2016 <br />(Site Coordinates 37.4914"N, t22.2263'Wl <br />353 Main Street Apartments <br />Redwood City, California <br />May L,2018 <br />(Original Report Dated November 18,20L6) <br />1.658g <br />0.763g <br />E <br />0.9 <br />2.4 <br />L.4929 (F.*S') <br />L.8329 (Fu*Sr) <br />0.9959 (2/3 Svr,) <br />L.22Lg (2/3 Srvrr) <br />0.595g <br />Mapped Short Term Spectral Response Parameter - Ss <br />Mapped L Second Spectral Response Parameter - Sr <br />Site Class: <br />Site Coefficient - Fa <br />Site Coefficient - Fu <br />Site Modified Short Term Parameter - Srvrs <br />Site Modified L Second Parameter - Srvrr <br />Site Design Short Term Parameter - Sos <br />Site Design L Second Parameter - 5or <br />PGAm <br />6301842-00r.1610-038.SER.REV2 <br />7.B. - Page 64