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Page 6 For the proposed new exterior concrete slabs including new driveway the over- excavation and recompaction should be minimum 1 ft deep and 1 ft. outside of the new slab areas. After removal of the recommended 3 ft. deep soils, the exposed bottom of the removal area, especially the previous swimming pool backfill soils must be evaluated. If needed, additional / deeper removal must be performed. This will be evaluated and determined by the geotechnical engineer based on the conditions to be exposed during the excavation. In addition, if concrete chunks / pieces (which may have previously left in place during the previous backfilling of the previous swimming pool) would be noticed, they must be completely removed and discarded of offsite (and replaced with new clean soils which must be properly compacted). Additional excavation down to the bottom of the previous swimming pool may be needed for this evaluation. Again, this will be determined by the geotechnical engineer of record during the excavation based on the conditions to be exposed during the excavation. The fill/backfill materials should be free of organic matter and oversized materials, 4 inches or greater in diameter, placed in near-horizontal loose lifts not to exceed eight inches in thickness, and moisture conditioned to slightly over optimum moisture content prior to compaction. Imported soils, if any, should have a very low expansion potential and should be geotechnically observed/tested and accepted by the geotechnical consultant prior to using at the site. In general, grading at the site, if any, should be performed in accordance with the requirements of the City and under the geotechnical observation and testing of the project geotechnical consultant. The compaction criterion for fill and backfill materials is a minimum of 90% of the maximum density determined in accordance with ASTM Test Method D1557. Temporary Excavations In general, temporary excavations should be performed in accordance with OSHA requirements. In general, care should be taken during excavation near an existing structural object, if any to ensure no damage is done to the existing object. For this project, the proposed detached ADU will be located far away from the existing building. Therefore, impact of the proposed temporary excavation to the existing building is not anticipated. BUILDING FOUNDATION DESIGN GUIDELINES 2010 W Alco Ave Unit #24/22/2025