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St. Barbara Catholic School <br />Project No.: D-6289-01 <br />3. Intensity and duration of ground shaking. <br />4. Clays with a PI < 12 and moisture content > 85% of the liquid <br />CITY OF SANTA ANA <br />Planning and Building Agency <br />may, lS. <br />Approved <br />FOR PERMIT ISSUANCE <br />Master ID: <br />:susceptible <br />to liquefaction. Moreover, sensitive soils having PI > 18 can undergo severe <br />strength loss. <br />5. Pore pressure increase. <br />The site will be susceptible to liquefaction, if all the items discussed above meet the <br />criteria. An examination of the existing conditions at the site, in relation to the criteria <br />listed above, indicates the following: <br />1. A penetration test using Standard Penetrometer indicates that the soil within the <br />depth range studies is in medium dense sand. <br />2. Based upon seismic evaluation, it is concluded that the possibility of high ground <br />shaking is very likely if San Joaquin Hills Fault ruptures. <br />3. Most of the soil layers are medium dense to dense. <br />Based on the above criteria and our preliminary evaluation, potential for earthquake <br />induced liquefaction is likely at this site. Also, the site is located within seismic <br />liquefaction hazard zone (CGS, Newport Beach Quadrangle, released April 17, 1997), <br />therefore an in-depth earthquake -induced liquefaction potential is necessary, however, <br />since there is no major structure planned to be built (site improvement), per Guidelines <br />for Evaluation and Mitigating Seismic Hazards in California (Special Publication SP- <br />117A) and Public Resources Code of Regulations Section 3601 (e), liquefaction analysis <br />is not performed. <br />Statement <br />Based on the findings of this study, it is our professional opinion that the proposed <br />renovation project will not be subject to a geologic hazard from settlement, slippage, or <br />13 <br />