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Project No. JB-20100 4 December 2000 Page 7 On-site soil generated by site grading may be used as structural fill provided the soil is free of deleterious and organic materials and is approved for use as fill by our representative. The on-site low to non-expansive soils should be moisture-conditioned, and compacted to a minimum of 90 percent relative compaction at a minimum of 2 percent over the optimum moisture content according to the latest ASTM test methods and procedures. All import fill to be placed must be compacted to a minimum relative compaction of 90 percent of the maximum dry density and moisture- conditioned to a minimum of 2 percent over the optimum moisture content according to ASTM test methods and procedures. The import fill should be non-expansive, free of deleterious materials, and meet the following requirements in Table 1. Table 1 IMPORTED MATERIAL REQUIREMENTS Sieve Size Percent Passing 6 inches (150 mm) 100 4 inches (100 mm) 95 - 100 # 200 5 - 25 Plasticity (Pp = 12 or less Liquid Limit (LL) = 30 or less Samples of any proposed import fill planned for use on this project should be submitted to our representative for approval and appropriate testing no less than 4 working days before the expected delivery to the job site. ' For pavement areas and concrete slabs-on-grade, the upper 12 inches of subgrade soils should be scarified, moisture-conditioned as necessary, and recompacted to a minimum of 95 percent relative compaction. 1 5.2 Foundations 5.2.1 Conventional Foundation System 1 If the earthwork recommendations included in this report are complied with, r the proposed buildings and canopy structure may be supported by J conventional foundations established on compacted, engineered fill. Settlement of the proposed structures, supported as recommended, should be less than 1 inch. Recommendations for footing depths and foundation details are included in Table 2. MKorbmacher Engineering. Inc.