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September 30, 2007 <br /> NOA Project Number: E07147A <br /> Table 3. <br /> Soil Boring Log. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 1-4 Brown silt with some sand SM <br /> 4-6 Brown silty clay CL <br /> 6-7 Brown silt with some sand SM <br /> 7-10 Brown silty sand SM <br /> r. <br /> 10-14 Greyish brown,clayey sand SC <br /> 14-24 Brown clayey sand SC <br /> 24-25 Brown silty sand SM <br /> j/5.4 Discussion of Soil Lithology <br /> A visual inspection of the soils from on-site drilling indicates some potential for percolation because <br /> of some of the coarser-grained soils encountered on site. A percolation test is the best method to <br /> 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 fine- <br /> grained or 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 hole is included as Plate 1 in the appendix <br /> of this report. <br /> /6.2 Number of Percolation Tests <br /> One (1) shallow and one (1) deep percolation test were conducted on the site, for a total of two (2) <br /> percolation tests. <br /> tl6.3 Boring Preparation and Presaturation <br /> A total of two (2) soil borings were drilled with a hand-augur on September 13, 2007. <br /> Two 1.5-inch diameter PVC pipes with perforations on the bottom were used to measure the drop <br /> of water in the percolation test borings. Approximately 2 inches of"pea gravel" were placed in the <br /> bottom of the open soil borings, then the PVC pipes were installed on top of the gravel. "Pea <br /> gravel"was then used to backfill in the annular spaces. <br /> 6 <br />