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2717 Huckleberry Rd, Unit #2 Santa Ana, CA 92706 <br /> <br /> <br />regular foundation system for a residential structure as recommended in this report should be used for the new <br />structure. <br /> <br />During our research, and in conversations with other Engineers and Contractors, it was discovered many of the <br />new residences in the area have been designed and constructed with regular, shallow footings with slabs on <br />grade, not with strengthened foundation supports. <br /> <br />We believe if the area would be “liquefied” in the future due to a very strong earthquake, the potential damage <br />to the proposed new structures which will be properly structurally designed in accordance with the new up-to- <br />date codes would be much less severe than the existing on-site structures and surrounding existing houses which <br />have been previously structurally designed based on old codes (which are much less stringent than the current <br />new codes). However, the owner(s) of this property should be aware of the potential damage to the new <br />structures due to liquefaction. <br /> <br />In summary, it should be recognized that structural mitigation may not reduce the potential of the soils to <br />liquefy during an earthquake; and there will remain some risk that the new structures could still suffer damage if <br />liquefaction occurs, during a very strong earthquake. <br /> <br />Note: In accordance with the California Geological Survey (CGS), Special Publication (SP) 117A, a detailed <br />site-specific liquefaction study is not required for this project, since the proposed new dwelling structure is not <br />exceeding two stories and is not part of a development of four or more dwelling units. <br /> <br />For conservative purposes, a strengthened / stiffened foundation system having thicker slabs with more <br />reinforcements and deeper and wider footings with more reinforcement as recommended in this report <br />should be used for support of the proposed structures. <br /> <br />Slope Stability <br /> <br />The site is a flat area; therefore, slope instability is not a concern for the proposed development. <br /> <br />CONCLUSIONS AND RECOMMENDATIONS <br /> <br />General Conclusions <br /> <br />Construction of the proposed structure at the subject site is considered geotechnically feasible, provided the <br />recommendations outlined in this report are implemented. <br /> <br />Note: The conclusions and recommendations of this report are based on information as interpreted from our <br />limited subsurface investigation. It is not anticipated but they should be revised accordingly if geotechnical <br />conditions to be exposed during site preparation/ grading and construction significantly differ from our <br />findings and interpretations. <br /> <br />Page 5 of 22