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.. February 21, 2007 <br /> NOA Project Number: E07015A <br /> 5.2 Soil Boring Dimensions <br /> The soil boring was approximately three and a half feet, as noted above, and was four inches in <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 three and a half <br /> 6. foot soil boring. <br /> Table 4. <br /> Soil Boring Log. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0-3.5 Brown smdv silt SM <br /> 5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow soils from on-site drilling indicates potential for percolation <br /> because of the silty conditions of the soils. A percolation test is the best method to determine the <br /> ` suitability of the soils. Please see the next section for percolation test results. Generally speaking, <br /> coarser-grained soils have much greater potential for percolation than fine-grained or cemented <br /> soils. <br /> 6.0 PERCOLATION TEST INFORMATION <br /> 6.1 Percolation Test Locations <br /> A site map indicating the locations of the percolation test holes is included as Plate 1 in the appendix <br /> of this report. <br /> 6.2 Number of Percolation Tests <br /> One shallow percolation test was conducted on the site. <br /> 6.3 Boring Preparation and Presaturation <br /> ` A total of one shallow soil boring was advanced on the site with a hand auger on January 25, 2007. <br /> A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of <br /> water in the percolation test boring. Approximately 2 inches of"pea gravel' were placed in the <br /> 6 <br /> — <br />