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�1 t ! <br /> 1 <br /> February 16; 2005 <br /> NOA Project Number: E040148A <br /> Table 5. <br /> Soil Borina Logy for P-2. <br /> Depth Interval (ft) Soil Type Unified Soil Classification <br /> r0-1.5 Dark brown moist da e silt �II <br /> 1.5-3 Brown,moist,sand silt <br /> 5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow and deep soils from on-site drilling indicates some potential for <br /> j satisfactory percolation. 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, sandy soils have <br /> much greater.potential for percolation than fine-grained soils. <br /> l <br /> F <br /> 6.0 PERCOLATION TEST INFORMATION <br /> Fj6.1 Percolation Test Locations <br /> A site map indicating the locations of the percolation test holes is included as Plate 1 of this report. <br /> 6.2 Nu: mber of Percolation Tests <br /> One shallow percolation test was conducted on each proposed parcel of the Site, for a total of two <br /> shallow tests. <br /> fl6.3 Boring Preparation and Presaturation <br /> The soil borings on Parcels 1-and 2 were advanced on the Site with a hand auger on January 27, <br /> 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. Several feet <br /> of"pea gravel" were backfilled in the annular space. <br /> Presaturation of the percolation test holes occurred on February 8, 2005. The depth of water used <br /> to pre-soak was 12 inches above the bottom of the boring. - �r <br /> 6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period, the presaturated holes were found to be intact on February 9, 2005. <br /> 7 <br /> F! <br /> F! <br />