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August 28, 1991 BALBI&CHANG ASSOCIATES File No. 1525-69 recompacted to a minimum relative density of 90 percent of the maximum dry density as determined by ASTM designation D1557-78. The moisture content of the recompacted soil should be at 2 to 4 percent above the optimum as determined by ASTM designation D1557-78. g. On-site soils from excavation without the proper treatment as presented in this report may not be reused as structural fill material due to their high plasticity. If imported fill is used, it should be approved by the soils engineer prior to being brought to the site. Imported materials should be non-expansive, free of perishable organic materials, with a Plasticity Index (P.I.) of 12 or less and a Liquid Limit (L.L.) of 30 or less, and meet the particle size requirements as listed in Table 1 below. TABLE 1 IMPORTED MATERIAL SIZE REQUIREMENTS Sieve Size Percent Passing 3 inches 100 No. 4 40 - 90 Ret No. 200 5 - 25 I i h. All structural fill material, on-site and imported,--should be compacted in lifts no greater than 8 inches in thickness by mechanical means. Compaction by jetting or flooding should not be allowed except specifically instructed by the geotechnical engineer. Fill material should be compacted to a minimum relative compaction of 90 percent of the maximum dry density, at 1 to 3 percent above the optimum moisture content as determined by ASTM designation D1557-78. Non-structural fill, such as that in the landscaping areas, may be compacted to 85 percent, however, excessive settlement may resulted from such low compaction effort. i. The top 12 inches of subgrade soils for all paved areas should be properly compacted to provide adequate pavement support. Pavement subgrades should be compacted to a minimum of 95 percent of the maximum dry density at a moisture content of 1 to 3 percent over the optimum moisture content as determined by ASTM designation D 1557-78. i i E Pale 7 of 17 E C