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40 <br /> Grading must meet the governing agencies requirements for fill compaction <br /> and placement, cut and fill slopes, and surface preparation. Quality control of <br /> as-compacted density should be performed. Based on the opinion of the Soils <br /> Engineer in the field, laboratory compaction tests should be performed in the <br /> field during construction quality control when material grain-size or plasticity <br /> characteristics change or are suspected to be different. <br /> Fill Reinforcement. As indicated earlier in the report, the bearing capa- <br /> city of the fill can be enhanced and the differential settlements reduced by <br /> placing soil reinforcing at 6-inch vertical intervals in the fill as it is being <br /> compacted. The reinforcing should extend to at least 10 feet beyond the <br /> foundations in all directions. Minimum thickness of the reinforced section that <br /> is required to increase the allowable bearing pressures are discussed in the <br /> Foundation Recommendations for the various project components. <br /> Trench Backfill. On-site materials may be used for backfilling trenches. <br /> Compaction by flooding and jetting should not be allowed for backfill materials <br /> comprised of on-site soils. Placement and compaction of these backfill materials <br /> should comply with compaction criteria and control as recommended in the <br /> Compaction Requirements section of this report. <br /> If well graded sands are imported, these materials may be compacted by <br /> flooding and jetting provided the sand equivalent for the material is greater <br /> than 40. <br /> Excavations and Trenches <br /> We expect excavations for formed foundations and shallow utilities to be <br /> made using open-cut procedures. Temporary or permanent excavations should be no <br /> steeper than 1-vertical to 2-horizontal at this site, unless the excavations are <br /> shored in conformance to local and/or OSHA standards. <br /> The bases of foundation excavations should be protected against any dis- <br /> turbance by construction activity. The bases of large excavations should be <br /> proof-rolled with a heavy roller. Smaller excavations should be inspected and <br /> compacted as specified prior to foundation construction. Any soft spots or other <br /> unsuitable material should be removed and replaced with structural fill. Drain- <br /> age should be established away from excavations in order to reduce the inflow of <br /> rainwater and other surface runoff. <br /> McClelland <br /> 1144A/CC-40 ',► <br />