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L <br /> LMay 25, 2006 <br /> NOA Project Number: E06040A <br /> Ldiameter. <br /> L5.3 Soil Lithology Observed <br /> Generally, the soil encountered in the borings is similar to the soils reported by the San Joaquin <br /> L County Soil Survey for the area (USDA, 1992). Table 4 presents a soil log for the 25 foot deep soil <br /> boring. Conditions were comparable in the shallow hole. <br /> ` Table 4. <br /> t` Soil Boring Log. <br /> Depth Interval(h) Soil Type Unified Soil Classification <br /> 0-5 Dark brown,moist fine clay CL <br /> V <br /> 5-25 Light brown,moist,silty clay CL <br /> 5.4 Discussion of Soil Lithology <br /> L A visual inspection of the shallow and deep soils from on-site drilling indicates little potential for <br /> percolation because of the fine clayey conditions of the soils. A percolation test is the best method <br /> to determine the suitability of the soils. Please see the next section for percolation test results. <br /> Generally speaking,coarser-grained soils have much greater potential for percolation than fin- <br /> grained or cemented soils. <br /> L6.0 PERCOLATION TEST INFORMATION <br /> 1 6.1 Percolation Test Locations <br /> L <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 and deep percolation test were conducted on the site. <br /> 6.3 Boring Preparation and Presaturation <br /> A total of one deep and one shallow soil boring were advanced on the Site with a truck-mounted <br /> Ldeep rock augur rig on April 24,2006. <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 /> Ir <br /> 6 <br /> L .,44 <br /> L <br />