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Mater Dei High School October 20, 2023 Proposed Dance Studio, Santa Ana, California Project No. 3204.I 3204-I-01R (10/23) 9 grades are expected to be required to facilitate the placement and compaction of fills. We suggest obtaining unit prices for stabilization of subgrades that are too soft and wet to allow for placement and compaction of overlying fills. Unit prices should be obtained for placement of 18 inches of aggregate base (see Section 4.13 for base requirements). Severe conditions may also require placement of a geogrid. 4.3.4 Material for Fill The on-site soils are, in general, suitable for use as compacted fill. Clayey soils, if encountered, should not be used within 2-feet of flatwork. Imported fill material should be predominately granular (contain no more than 40 percent fines - portion passing No. 200 sieve) and non-expansive (E.I. less than 20). GPI should be provided with a sample (at least 50 pounds) and notified of the location of any soils proposed for import at least 72 hours in prior to importing. Each proposed import source should be sampled, tested and accepted for use prior to delivery of the soils to the site. Soils imported prior to acceptance by GPI may be rejected if not suitable. Both imported and existing on-site soils, to be used as fill, should be free of debris and any pieces larger than 6 inches in greatest dimension. Fill materials placed within the upper 3 feet of the finished building pad should not contain particles larger than 3 inches in greatest dimension. If open-graded rock is used as backfill, the material should be placed in lifts and mechanically densified. Open-graded rock should be separated from the on-site soils by a suitable filter fabric (Mirafi 140N or similar). 4.3.5 Placement and Compaction of Fills Fill soils consisting of the on-site materials should be placed in horizontal lifts, moisture- conditioned, and mechanically compacted to densities equal to at least 90 percent of the maximum dry density, determined in accordance with ASTM D1557. The optimum lift thickness will depend on the compaction equipment used and can better be determined in the field. The following uncompacted lift thickness can be used as preliminary guidelines. Plate compactors 4-6 inches Small vibratory or static rollers (5-ton±) or track equipment 6-8 inches Heavy loaders or heavy vibratory rollers 8-12 inches The maximum lift thickness should not be greater than 12 inches and each lift should be thoroughly compacted and accepted prior to subsequent lifts. Granular fills should be placed at a moisture content of 0 to 2 percent over the optimum moisture content. Fills consisting of the on-site silts and clays, if encountered, should be placed at a moisture content of 1 to 3 percent over the optimum moisture content in order to achieve the required compaction. The moisture content of the near surface soils can be expected to be generally above the optimum moisture content. As such, moisture conditioning may be required prior to replacing the soils as properly compacted fill. 1202 W Edinger Ave10/3/2024