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February 28,2007 <br /> NOA Project Number: E07023A <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 /> r <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 /> F6.2 Number of Percolation Tests <br /> One shallow percolation test was conducted on each parcel of the site for a total of two percolation <br /> F, tests. <br /> li <br /> 6.3 Boring Preparation and Presaturation <br /> One shallow soil boring was advanced on the site with a hand auger on February 7 and another on <br /> February 12,2007. <br /> Fij 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 /> Fbottom 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 24 hours before each percolation test. The <br /> depth of water used to pre-soak was 12 inches above the bottom of the boring. <br /> k <br /> F1 6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period,the presaturated hole was found to be intact and dry on February 8 <br /> and 13,2007. <br /> 6.5 Percolation Test Procedure <br /> F Aercolation test was conducted for the first borIn on February 8, 2007 and the second on <br /> p g <br /> �. <br /> i <br />