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SCE Santa Ana October 25,2019 Project No. 3.31634 Page 10 15.2.1 Site Preparation Prior to grading, the proposed structural improvement areas (i.e. all structural fill, pavements areas and structural building, etc.) of the site should be cleared of surface and subsurface obstructions, including vegetation. Vegetation and debris should be disposed of offsite. Holes resulting from removal of buried obstructions, which extend below the recommended removal depths described herein or below finished site grades (whichever is lower) should be filled with properly compacted soil. Should existing underground utilities be encountered they should be completely removed and properly backfilled. Alternatively, if the utility is not within the influence zone of the foundation it may be abandoned in place by fully grouting the pipe. 15.3 Excavation Up to approximately 2 to 2 ½-feet of surficial undocumented fill soils were observed during our investigation. These soils will need to be over-excavated and removed from within all structural areas. Where not constrained at junctions with existing structures, excavations should extend to a minimum horizontal distance of at least 3-feet outside any building footprints. The actual depth of removal may vary and should be field verified and approved by the geotechnical consultant prior to fill placement. Removals and compaction recommendations are provided in Appendix C. Cut-Fill transitions shall not be allowed to occur below foundations. We recommend that the subgrade materials be made uniform. For building pads located across a cut- fill transition, this can be accomplished by excavating the native materials to at least 2- foot below the bottom of the deepest footing and extending to 3-foot beyond the building corners. The bottom of the excavation should then be scarified, moisture conditioned, and replaced as a uniform layer of engineered fill. Site soils are suitable for use as compacted fill if they are processed in accordance with the recommendations in Appendix C. Approved fill soils should be placed in thin lifts (≤ 8-inches loose thickness) and moisture conditioned to at least optimum moisture content. All fill should be compacted to a minimum of 90-percent relative compaction. Local conditions may be encountered during excavation that could require additional over-excavation beyond the above noted minimum in order to obtain an acceptable 55 of 100 1327 S Grand Ave 12/12/2024