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revised accordingly if geotechnical conditions to be exposed during site preparation/ grading and <br />construction significantly differ from our lindings and interpretations. <br />Conventional shallow footings with slabs-on-grade can be used for support ofthe proposed new <br />structure. <br />The following recommendalions are considered minimum and may be superseded by more <br />restrictive requirements ol' the architect, c iv illstructural design engineer. building codes. or <br />governing agencies. <br />Geotechnical lmpact on Ncighboring Properties <br />The proposed development will not adversely impact the neighboring properties from the <br />geotechnical perspective. provided the recommendations outlined in this report are property <br />implemented. <br />Site Preparation/Grading <br />For the proposed new structures with new slabs-on-grade, the 2 ft. thick near ground surface <br />earth materials should be scarified/over-excavated and recompacted. The over- <br />excavation/scarification should be extended laterally beyond the outside perimeter of the new <br />structure a minimum distance equal to the depth of scarification/over-excavation and <br />recompaction ( | ft. in this case). For proposed new exterior slab areas including new driveway. if <br />any. depth of over-excavation/scarification and recompaction can also be one ft.. <br />Deeper remedial removal is not anticipated. However, ifdeeper loose/soft soils such as due to <br />removal ol underground objects. if any, are encountered. deeper remedial removal and <br />recompaction will be required. This will be determined by the geotechnical consultant based on <br />the actual conditions to be exposed at the time of grading. <br />It is not anticipated. however. if wet soils are encountered during grading. removal ol'wet soils. <br />such as of about 2 ft. thick. and replacement with crushed rocksislurry can be performed. <br />Geogrids can also be used for bridging. This will be determined by the geotechnical consultant <br />based on the exposed conditions during excavation at the site. <br />lmported soils. if any. should have a low expansion potential and should be geotechncially <br />observed/tested and accepted by the geotechnical consultant prior to using at the site. <br />In general. the till/backfill materials, if any. should be free of organic mafter and oversized <br />materials. 6 inches or greater in diameter. placed in near-horizontal loose lills not to exceed eight <br />inches in thickness. and moisture conditioned to slightly over optimum moisture content prior to <br />compaction. Thicker lifis can be used if capable of being properly compacted to the required <br />relative compaction (such as by using heavy compaction equipment). <br />ln general. grading at the site. if any. should be performed in accordance with the requirements <br />of the City of Santa Ana and under the geotechnical observation and testing of the project <br />geotechnical consultant. The compaction criterion for fill and backfill materials is a minimum of <br />90% of the maximum density determined in accordance with ASTM Test Method D I 557. <br />Page 4