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Page 6 <br /> <br />For the proposed new exterior concrete slabs including new driveway, if any, the <br />overexcavation and recompaction should be minimum 1 ft deep and 1 ft. outside of the <br />new slab areas. <br /> <br />Deeper remedial removal is not anticipated; however, this will be determined in the field <br />by the project geotechnical engineer, based on the actual conditions to be exposed at the <br />time of the site grading/preparation. <br /> <br />The fill/backfill materials, if any, should be free of organic matter and oversized <br />materials, 4 inches or greater in diameter, placed in near-horizontal loose lifts not to <br />exceed eight inches in thickness, and moisture conditioned to slightly over optimum <br />moisture content prior to compaction. <br /> <br />Imported soils, if any, should have a very low expansion potential and should be <br />geotechnically observed/tested and accepted by the geotechnical consultant prior to using <br />at the site. <br /> <br />In general, grading at the site, if any, should be performed in accordance with the <br />requirements of the City and under the geotechnical observation and testing of the project <br />geotechnical consultant. The compaction criterion for fill and backfill materials is a <br />minimum of 90% of the maximum density determined in accordance with ASTM Test <br />Method D1557. <br /> <br />Temporary Excavations <br /> <br />In general, temporary excavations should be performed in accordance with OSHA <br />requirements. In general, care should be taken during excavation near an existing <br />structural object, if any to ensure no damage is done to the existing object. <br /> <br />For this project, the detached ADU will be located far away from the existing building. <br />Therefore, impact of the proposed temporary excavation to the existing building is not <br />anticipated. <br /> <br />BUILDING FOUNDATION DESIGN GUIDELINES <br /> <br />Geotechnical Parameters For Structural Design <br /> <br />For conservative purposes, the following “lowest” code values should be used for <br />structural design, as needed. <br /> <br />a. Allowable vertical bearing earth pressure: 1,500 psf. <br /> <br />An increase of one-third is permitted when using the alternative load <br />combinations that include wind or earthquake loads. <br /> <br />FLOOD ZONE - 4810 W Sixth <br />St Unit# 25/5/2025