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Page 2 <br /> <br />Geotechnical Conditions <br /> <br />Based on the published geologic map prepared by the California Division of Mines and <br />Geology (CDMG), the site is located within a broad flat alluvium and colluvium area. <br /> <br />Based on the State of California SEISMIC HAZARD ZONES Map, Newport Beach <br />Quadrangle, the subject site is located within a potential liquefaction zone. For <br />conservative purposes, we assume that the site will be subjected to the liquefaction; and <br />to mitigate the potential adverse effects due to potential liquefaction, as for other recent <br />near-by projects, a strengthened foundation system is recommended to be used for the <br />proposed new structure. <br /> <br />To verify the near ground surface soils, a 5 ft. deep test hole has been drilled using a <br />hand-held drilling tool and soil samples were collected for laboratory testing. The <br />approximate location of the test hole is depicted on the Site Plan / Geotechnical Map. The <br />geotechnical boring log and summary of results of the laboratory testing are included in <br />Appendix B. <br /> <br />Based on the data of our test hole, the near ground surface earth materials generally <br />consisted of silty fine sand with minor clay and some gravel, damp to moist, medium <br />dense and have a very low expansion potential. <br /> <br />Groundwater <br /> <br />Free standing groundwater was not encountered in our test hole. <br /> <br />Based on the “Historically Highest Ground Water Contours and Borehole Log Data <br />Locations, Newport Beach Quadrangle”, Plate 1.2 of the Open-File Report 97-08 <br />prepared by California Division of Mines and Geology (CDMG), Department of <br />Conservation, the historically highest groundwater level at the subject site is about 4.5 ft. <br />below the ground surface. <br /> <br />Free standing ground water was not reported to be an issue at the site and in the vicinity. <br /> <br />Deep footings/excavations are not proposed for the site; therefore adverse effects due to <br />groundwater are not anticipated for the proposed development. <br /> <br />Note: it is not anticipated; however, if wet soils are encountered, removal of the wet soils <br />and replacement with drier soils/cement slurry can be performed. In addition, if needed, <br />crushed rock and or geogrids for bridging, etc. can also be used. This will be determined <br />by the geotechnical consultant based on the exposed conditions during the excavations at <br />the site. <br /> <br />FLOOD ZONE - 4810 W Sixth <br />St Unit# 25/5/2025