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$v. <br />.v� ` <br />': •�: <br />9f+�v. ��ft?cNY:t'.N.?•Y. •vj <br />Midwa Fault <br />4.8 S <br />6.3 <br />0.44 <br />Corral Hollow Fault <br />9 S <br />6.5 <br />0.33 <br />Greenville Fault <br />12 M <br />6.8 <br />0.32 <br />Los Positos and Livermore Faults <br />15.6 S <br />6.3 <br />0.20 <br />Verona and Pleasanton Faults <br />21.6 S <br />6.2 <br />0.13 <br />Calaveras C -D Fault <br />24 <br />6.3 <br />0.12 <br />Ha B -C Fault <br />30 QD <br />7.1 <br />0.15 <br />Orti&Llita Fault <br />33.6 SE <br />6.7 <br />0.10 <br />Auburn Shear Zone <br />oothills fault <br />46.8 (NE) <br />6.8 <br />0.07 <br />San Andreas Fault <br />48 S <br />7.8 <br />0.13 <br />1) Measured from Fault Map of California, SCDMG, 1992. <br />2) From Wesnousky, 1986 <br />3) From CDMG, 1974 <br />As indicated above, severe seismic shaking is anticipated for the region. Due to the close proximity of <br />the site to critical faults, it is recommended that repeat high ground acceleration (RHGA) equal to <br />65 percent of the maximum acceleration be used for evaluation of potential earthquakes of faults closer <br />than 20 miles of the site. <br />In lieu of specific site design, the provisions of the Uniform Building Code for lateral seismic loading <br />may be used in design. Based on the Uniform Building Code procedures, :the site is looted in Seismic <br />Zone 4. Higher lateral design loads should be used if required by local regulations. <br />Liquefaction is the sudden decrease in shearing strength of cohesionless soil due to vibration. During <br />dynamic or cyclic shaking, the soil mass is distorted, and interparticulate stresses are transferred from the <br />sand grains to the pore water. When the pore water pressure increases to the point that the <br />interparticulate effective stresses are reduced to zero, the soil behaves temporarily as a viscous fluid <br />(liquefaction) and, consequently, loses its capacity to support the structures founded thereon. In general, <br />liquefaction is not considered possible in unsaturated. soils. <br />Engineering research of soil liquefaction potential (Seed, et. al., 1982 and 1985) indicates that three basic <br />factors must exist concurrently in order for liquefaction to occur, namely: <br />IN 40007-095-01 <br />ft%nu X97-06j,u&tggeo.doc <br />4-2 <br />