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LNovember 30,2005 <br /> NCA Project Number: E05116B <br /> Page 7 <br /> 5.1 Soil Boring Locations <br /> A total of nine soil borings were advanced on the Site, six borings to a depth of approximately three <br /> feet and three borings to a depth of approximately twenty-five feet. The soil borings were used later <br /> for percolation test holes; the locations of the borings are indicated in Plate 1. <br /> L5 5.2 Soil Boring Dimensions <br /> I The soil boxings were 25 feet deep or about three to three and a half feet deep, as noted above, and <br /> were four inches in diameter. <br /> S3 5.3 Soil Lithology Observed <br /> Generally,the soil encountered in the boring is similar to the soils reported by the San Joaquin <br /> y County Soil Survey for the area (USDA, 1992). Table 4 presents the representative soil log for the 25 <br /> foot deep soil borings. Conditions were comparable in the shallow holes. <br /> Table 4. <br /> Soil Boring Log. <br /> Depth Interval (ft) Soil Type Unified Soil Classification <br /> _- 0-5 Brown loose silty sand SM <br /> 3-8 Hardpan,dark brown sandy silt,slightly cemented SM <br /> 8-17 Hardpan,reddish brown,silty sand,highly SM <br /> cemented <br /> 17-25 Rusty brown,fine sand with silt SM <br /> L 55 5.4 Discussion of Soil Lithology <br /> A visual inspection of the soils from on-site drilling indicates potential for percolation because of the <br /> sandy nature of the soils. A percolation test is the best method to determine the suitability of the <br /> soils. Please see the nem section for percolation test results. Generally speaking, sandy soils have <br /> much greater potential for percolation than fine-grained or cemented soils. <br /> Yr <br /> L <br /> 7 <br /> .,04 <br /> r <br /> IL. <br />