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<br /> <br />ASSOCIATED SOILS ENGINEERING, INC. Project No.: 7160.23 <br />2860 Walnut Avenue, Signal Hill CA 90755 January 23, 2024 <br />Tel: (562) 426 -7990 * Fax: (562) 426 -1842 Page 14 <br />inches of exposed native subgrade should be reworked to at least 90 percent relative <br />compaction with a minimum moisture of two (2) percentage points above optimum moisture <br />content. <br /> <br />Please note that if undocumented fill is encountered in any area to receive remedial grading <br />discussed in Sections 5.2.3.a) or b) above, recommendations stipulated in Section 5.2.1 above, <br />if more stringent, should be complied with. If all undocumented fill is not removed full depth in <br />areas of exterior slab-on-grade, concrete flatwork, hardscape or pavement, the Owner should <br />be made aware that more frequent maintenance and/or repair will likely be required. Please <br />also note that, from geotechnical viewpoint, new landscape area with only softscape is not <br />subject to subgrade preparation and remedial grading requirements mentioned in Sections <br />5.2.1 and 5.2.3. <br /> <br />In case of the presence of localized loose soils, the overexcavations need to be deepened <br />accordingly to delete the loose soil condition. However, this deepened overexcavation may be <br />terminated when the exposed native, undisturbed soils exhibit a natural relative compaction <br />greater than 85 percent, subject to testing and inspection by the representative from the <br />Geotechnical Consultant. <br /> <br />The Geotechnical Consultant’s field representative should be provided with appropriate <br />construction details and staking during grading to verify that depths and/or locations of the <br />recommended overexcavation are adequate. For areas on site that grading recommendations <br />stipulated in both Sections 5.2.1 and 5.2.3 apply, the more stringent grading criteria between the <br />two sections should govern. <br /> <br />The depth of overexcavation should be reviewed by the Geotechnical Consultant during the actual <br />construction. Any subsurface obstruction, buried structural elements, and unsuitable material <br />encountered during grading, should be immediately brought to the attention of the Geotechnical <br />Consultant for proper exposure, removal and processing, as recommended. <br /> <br />5.2.4 Temporary Excavation: <br />Excavations of site soils deeper than 4 feet should be temporarily shored or sloped in accordance <br />with Cal OSHA requirements. <br /> <br />a) Temporary Sloping: <br />In areas where excavations deeper than 4 feet are not adjacent to existing structures of public <br />right-of-ways, sloping procedures may be utilized for temporary excavations. It is <br />recommended that temporary slopes in both fill and native soils be graded no steeper than