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Transit Mix <br /> 12/30/16 <br /> Page 6 <br /> • Bray and Sancio (2006)found that soils with Plasticity Index (PI) < 12 and water content <br /> to liquid limit ratios (wc/LL) > 0.85 were susceptible to liquefaction, as evidenced by a <br /> dramatic loss of strength resulting from increased pore water pressure and reduced <br /> effective stress. <br /> • Boulanger and Idriss (2006) use PI < 7 to identify soils exhibiting "sand-like" behavior <br /> that are susceptible to liquefaction and PI >_7 to identify soils exhibiting "clay-like" <br /> behavior that are judged to not be susceptible to liquefaction. <br /> • Sancio (2003), and Bray and Sancio (2004) it was found that soil deposits may be <br /> categorized into three groups: Susceptible to liquefaction or cyclic mobility: we/LL>_ 0.85 <br /> and PI <_ 12, moderately susceptible to liquefaction or cyclic mobility: PI <_20 and we/LL <br /> >_ 0.80, too clayey to liquefy: PI > 20. <br /> • Seed et al. (2003)with the following conditions: Liquefiable: LL < 30 and PI < 10, <br /> Uncertain: 30 < LL< 40 and 10 < PI < 12. Clean sandy soils with few fines are <br /> vulnerable to seismically induced liquefaction. <br /> • Polito and Martin (2001) liquefaction screening criteria state the following conditions: <br /> Liquefiable: LL < 25 and PI < 7, Potentially Liquefiable: 25 < LL < 35 and 7 < PI < 10, <br /> Susceptible to cyclic mobility: 35 < LL < 50 and 10 < PI < 15. <br /> • Youd (1998) paper stated if the material is classified with a "C in the USCS <br /> nomenclature (e.g. CH, CL, SC, and GC), the material can be screened as non- <br /> liquefiable. Furthermore, soils may be liquefiable if they meet the following criteria: LL < <br /> 35, and PI < 7. <br /> • Seed and Idriss (1982) stated that clayey soils can be susceptible to liquefaction only if <br /> all three of the following conditions are met: Percent of particles less than 5 tam < 15%, <br /> LL < 35, and we/LL > 0.9. <br /> • Wang (1979) stated soils are susceptible to liquefaction if they meet the following <br /> criteria: Percent of particles less than 5 pm < 15% to 20%, and we/LL > 0.9. <br /> The potential for liquefaction for the new embankment is judged to be low based on the above <br /> criteria and due to the dense nature and clay content of the eolian soils used in the <br /> embankment construction. <br /> Brierley Associates <br /> 12/30/16 <br /> oipp0 Lici <br /> 24369 <br /> V� <br /> SrONAt. <br /> BRIERLEY <br /> ASSOCIATES <br /> Creating Space Underground <br />