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625 Cypress Avenue <br />Geotechnical Investigation <br /> <br />Project No. W1895-88-01 - 14 - April 23, 2024 <br />7. CONCLUSIONS AND RECOMMENDATIONS <br />7.1 General <br />7.1.1 It is our opinion that neither soil nor geologic conditions were encountered during the <br />investigation that would preclude the construction of the proposed development provided <br />the recommendations presented herein are followed and implemented during design and <br />construction. <br />7.1.2 Up to 5 feet of existing artificial fill was encountered during the site investigation. The existing <br />fill encountered is believed to be the result of past grading and construction activities at the <br />site. Deeper fill may exist in other areas of the site that were not directly explored It is our <br />opinion that the existing fill, in its present condition, is suitable for continued support of the <br />existing foundations and structural loads, as well as existing concrete slabs-on-grade and <br />replacement slab sections. However, the existing fill is not considered suitable for direct <br />support of new foundations. The existing fill and site soils are suitable for re-use as <br />engineered fill provided the recommendations in the Grading section of this report are <br />followed (see Section 7.4). <br />7.1.3 The enclosed seismically induced settlement analyses indicate that the site soils could be <br />susceptible up to approximately ½ inch of total settlement as a result of the Design <br />Earthquake peak ground acceleration (â…”PGAM). The resulting differential settlement is <br />anticipated to be less than ¼ inch over a distance of 30 feet. <br />7.1.4 The project structural engineer should evaluate the existing foundations, existing building <br />loads, and proposed improvement loads. Where excess foundation capacity remains, the <br />existing foundations may be utilized to support additional loads associated with the proposed <br />improvements (see Section 7.5). However, adding heavier loads to existing foundations could <br />induce settlements which could be detrimental to existing structural connections.