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December 11, 2006 <br /> NOA Project Number:E06141A <br /> Table 4. <br /> Soil Boring Log. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0-2 Medium brown,silty sand MI <br /> 2.0_3.2 Medium brown,fine sand Mt <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 sandy nature 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 /> 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 ' the appendix <br /> of this report. <br /> 6.2 Number of Percolation Tests <br /> Two shallow percolation tests were conducted on each parcel,for a total of two shallow percolation / <br /> tests on the subject property. <br /> 6.3 Boring Preparation and Presaturation <br /> A total of two shallow soil borings were advanced on the Site with a hand augur on October 30, <br /> 2006. A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop <br /> of 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 /> 9 <br />