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SD. = 273 SM, = 0.987 (for the short period of 0.2 second) <br />SDr = 2/3 SMr = 0.546 (for the l -second period) <br />PGA = 0.553 <br />The above seismic parameters should be verified by the civilistructural design engineer and <br />approved by the govemmenlal agency prior to using. <br />The Seismic Design Category D can be used for the site <br />The civil/structural design engineer should consult with the project geotechnical consultant. il <br />additional geotechnical information is needed for structural design. <br />Based on the Seismic Hazard Zones Map. Newport Beach Quadrangle (which cover the subject <br />site), the site is located within a potential liquefaction zone. Therefore. liquefaction may occur at <br />the site. and the property owner(s) should be aware of the risks associated with being in a <br />potential liquefaction zone. We recommend the proposed new structure be designed based on <br />up-to-date building codes and be supponed by a strengthened lbundation system as <br />recommended in this report to reduce the potential adverse effects due to the potential <br />liquefaction to the proposed new structure. <br />The site is a flat areal therefore, slop€ instability is not a concem for the proposed development. <br />Ground Water <br />Grounduater uas not an issue lor the entire area <br />Deep footings are not proposedi therefore. adverse ef'fects due to groundwater,if any. is not <br />anticipated for the proposed development. <br />It is not anticipated. llowever, if wet soils are encountered during grading/construction, removal <br />of *'et soils and replacement with drier soils/slurry can be performed. In addition, if needed. <br />geogrid layers/crushed rocks can also be used for bridging. <br />CONCLUSIONS AND RE <br />General Conclusions <br />Construction of the proposed development at the subject site is considered geotechnically <br />feasible. provided the recommendations outlined in this report are implemented. <br />Nole: I'he conclusions and recommendations of this report are based on inlbrmation as <br />interpreted from our limited subsurf'ace investigation. It is not anticipated but they should be <br />Page 3 <br />[.iquefaction Potential <br />Slone Stabilitv