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October 11,2005 <br /> NOA Project Number: E0511 1B <br /> 5.1 Soil Boring Locations <br /> A total of 33 soil borings were advanced on the Site, 27 borings to a depth of approximately three <br /> feet and six borings to a depth of around 25 feet. The soil borings were used later for percolation <br /> test holes;the locations of the borings are indicated in Plate 1. <br /> 5.2 Soil Boring Dimensions <br /> The soil borings were approximately three or 25 feet deep, as noted above, and were four inches in <5 2J <br /> diameter. <br /> 5.3 Soil Lithology Observed <br /> Generally, the soil encountered in the boring is similar to the soils reported by the San Joaquin <br /> County Soil Survey for the area (USDA, 1992).Table 4 presents a soil log for the 25 foot deep soil <br /> 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 /> 0.7 Medium brown,moist clayey fin san SC <br /> 7-15 Light brown,moist,silty fine "Rwith clay SM <br /> 15-20 Gray,moist,cemented silty fine(sand with clay SM <br /> 15-25 Gray,moist san SM <br /> 5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow and deep soils from on-site drilling indicates some potential for <br /> percolation because of the sandy conditions of the soils. A percolation test is the best method to <br /> determine the suitability of the soils. Please see the next section for percolation test results. <br /> Generally speaking,sandy soils have much greater potential for percolation than fine-grained or �� Lie) <br /> cemented soils. <br /> 7 "044 <br />