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L March 28,2005 <br /> / NOA Project Number: E05027A <br /> y 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 present the soil logs for the 25 foot deep <br /> soil boring. Conditions were comparable in the shallow hole. <br /> ` Table 4. <br /> Soil Boring Log. <br /> Depth Interval (ft) Soil Type Unified Soil Classification <br /> - 0-7 Brown,moist,silty fine sand SM <br /> 7-15 Light brown,moist,silty fine sand SM <br /> / 15-25 Light brown,mois cemented silty sand SM <br /> L <br /> 5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow soils from on-site drilling indicates some potential for satisfactory <br /> Lpercolation. 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 cemented 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 of this report. <br /> L <br /> ` J 6.2 Number of Percolation Tests <br /> One shallow percolation test and one deep percolation test was conducted on the Site, for a total of <br /> one shallow and one deep percolation tests. <br /> 16.3 Boring Preparation and Presaturation <br /> 6. The soil borings were advanced with a truck mounted deep rock auger on March 10, 2005. <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 /> bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. "Pea Gravel' <br /> was then used to backfill in the annular space. <br /> L <br /> L 7 "OA <br /> L <br />