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` October 13,2004 <br /> NOA Project Number: E040109A <br /> /5.1 Soil Boring Locations <br /> Four soil borings were advanced on the Site, two a depth of 25 feet and two to three feet depth. <br /> The soil borings were used later for percolation test holes; the locations of the borings are indicated <br /> in Plate 1. <br /> i <br /> 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 /> The soil encountered in the borings was found to be silty,rather than clayey as reported by the San <br /> �' Joaquin County Soil Survey. Table 4 presents a representative soil log for the 25-foot deep soil borings. <br /> Conditions were comparable in all the borings. <br /> Table 4. <br /> Soil Boring Log for P-1 and P-2 <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0-5 Brown silty clay CL <br /> 5-10 Red-brown silt with fine to medium sand, SM <br /> cemented <br /> 10-20 Dark brown silt with fine to medium sand, SM <br /> cemented <br /> 20-21 Olive brown silt with medium sand,cemented SM <br /> _ 21-25 Medium brown silt with sand,cemented SM <br /> Note:Conditions were comparable in all holes,shallow and deep. <br /> L /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 /> 6. percolation. A percolation test is the best method to determine the suitability of the soils. Please <br /> see the next section for percolation test results. Generally speaking, sandy soils have much greater <br /> potential for percolation than fine-grained and clayey soils. <br /> too <br /> ilm <br /> 7 <br />