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IIIW <br /> LDecember 6, 2004 <br /> TOA Project Number: E040130A <br /> L5.1 Soil Boring Locations <br /> Six soil borings were advanced on the Site. Three borings were drilled to a depth of 25 feet, and <br /> three other borings were drilled to a depth of three feet. The soil borings were used later for <br /> / percolation test holes; the locations of the borings are indicated in Plate 1. <br /> V 5.2 Soil Boring Dimensions <br /> The soil borings were 25 or three feet deep,as noted above, and were six inches in 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 representative soil log for the <br /> 25-foot deep soil borings. Conditions were comparable in all six borings. <br /> Table 4. <br /> Soil Boring Log for P-1, P-2 and P-3. <br /> r Depth Interval (ft) Soil Type Unified Soil Classification <br /> 0-1 Reddish brown,moist silty sand with Fill <br /> angular gravel <br /> 1-15 Tan,moist, silty clay ML <br /> 15-25 Brown, moist, silty-gravel(subrounded WG <br /> 'A" - '/2") with thin clay lenses <br /> Note: Conditions were comparable in all holes, shallow and deep. <br /> /5.4 Discussion of Soil Lithology <br /> LA visual inspection of the shallow and deep soils from on-site drilling indicates some potential for <br /> satisfactory percolation. A percolation test is the best method to determine the suitability of the <br /> soils. Please see the next section for percolation test results. Generally speaking,gravelly soils have <br /> much greater potential for percolation than fine-grained soils. <br /> L <br /> 8 <br /> "04 <br /> L <br />