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2. Seismic Hazard <br />C:\TRICH\Jobs\4515582 Leprino Tracy\Report\Leprino Tracy CalARP 040221.docx 2-4 <br />Table 2-2: Seismic Hazard Comparison <br />CalARP Evaluation Code SDS SD1 <br />Original (2015) 2013 CBC 0.939 0.479 <br />Current (2020) 2016 CBC 0.953 0.483 <br />Percent Change 1.5% 0.8% <br /> <br /> <br /> <br />2.3 Secondary Seismic Hazards <br />An evaluation for secondary seismic hazards such as ground surface rupture, slope <br />failure, liquefaction, seismic settlement and tsunamis and seiches was performed with <br />findings as follows (see Appendix A): <br />Fault Rupture <br />Fault rupture occurs when two separated sections of the earth’s crust on either side of a <br />fault move either horizontally or vertically past each other. If this rupture extends to the <br />surface of the ground, it is called a surface or ground rupture. Surface or ground <br />ruptures of even a few inches generate tremendous forces and can severely damage <br />buildings or structures. <br />Although several faults are located relatively close to the site, no identified fault trace <br />underlies the site and it is not within an Alquist-Priolo Fault Rupture Zone (References <br />11 and 12). The nearest Alquist-Priolo Fault is the Greenville Fault located 14 miles <br />from the site. Therefore, the site is determined not to be at risk of fault rupture. <br />Liquefaction, Lateral Spreading and Landslides <br />Liquefaction is the process where saturated soils exposed to intense shaking from an <br />earthquake temporarily lose their strength and behave like a liquid. When sloping <br />grounds or hills are exposed to this same process, lateral spreading or landslides can <br />occur, resulting in the fluid-like movement of soil across adjacent areas. <br />The consequences of liquefaction vary with the degree of soil displacement and the <br />structure/facility configuration. The most predominant failures in industrial facilities that