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L <br /> September 25,2006 <br /> NOA Project Number: E06102B <br /> r.. Table 4. <br /> Soil Boring Log. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0-3 Reddish brown sandy At ML <br /> 3-5 Reddish brown to grey,sandy silt ML <br /> 5-8.5 Light brown,silty sand,hard an F SM <br /> r <br /> 5.4 Discussion of Soil Lithology <br /> �- A visual inspection of the soils from on-site drilling indicates potential for percolation because of the <br /> sandy nature of the soils. A percolation test is the best method to determine the suitability of the <br /> soils. Please see the next section for percolation test results. Generally speaking, coarser grained <br /> L soils have much greater potential for percolation than fine-grained or cemented soils. <br /> L /6.0 PERCOLATION TEST INFORMATION <br /> y 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 /> �• Two shallow percolation tests were conducted for a total of two percolation tests on the site. <br /> x/6.3 Boring Preparation and Presaturation <br /> A total of two shallow borings were drilled with a hand augur on September 5, 2006. <br /> 6. 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 /> Presaturation of the percolation test holes occurred on September 5, 2006. The depth of water used <br /> to pre-soak was 12 inches above the bottom of the borings. <br /> 6 <br />