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<br /> <br />Potential Consequences of Liquefaction or Secondary Liquefaction Included Hazards <br />Potential consequences of liquefaction or secondary liquefaction included hazards generally <br />consist of differential settlement (vertical deformations), lateral movement/lateral spreading <br />(horizontal deformations), oscillation, and reduction in foundation soil-bearing capacity <br />(bearing failure). <br />A sloping condition or drainage or stream channel does not exist at the site; therefore, lateral <br />movement/lateral spreading, oscillation, etc. due to potential liquefaction are not anticipated <br />to be credible hazards for the proposed new structure. <br />In general, based on our experience, differential settlement due to liquefaction (and reduction <br />in foundation soil-bearing capacity) is roughly estimated to be about 1/4 inch (for a horizontal <br />distance of 30 feet). <br />We believe if the area would be "liquefied" in the future due to a very strong earthquake, the <br />potential damage to the proposed new structure which will be properly structurally designed in <br />accordance with the new up-to-date codes would be much less severe than the existing on-site <br />structures and surrounding existing houses which have been previously structurally designed <br />based on old codes (which are much less stringent thanhe current new codes). However, the <br />owner(s) of this property should be aware of the potential damage to the new structure due to <br />liquefaction. <br />In summary, it should be recognized that structural mitigation may not reduce the potential of <br />the soils to liquefy during an earthquake; and there will remain some risk that the new <br />structure could still suffer damage if liquefaction occurs, during a very strong earthquake. <br />Note: In accordance with the California Geological Survey (CGS), Special Publication (SP) 117A, a <br />detailed site-specific liquefaction study is not required for this project, since the proposed new <br />dwelling structure is not exceeding two-story and is not part of a development of four or more <br />dwelling units. <br />Slope Stability <br />The site is a flat area; therefore, slope instability is not a concern for the proposed <br />development. <br />CONCLUSIONS AND RECOMMENDATIONS <br />General Conclusions <br />Construction of the proposed structure at the subject site is considered geotechnically feasible, <br />provided the recommendations outlined in this report are implemented. <br />1927 & 1929 S <br />Hickory St2/12/2025