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L November 17,2005 <br /> NOA Project Number: E05152A <br /> 6. in boring P-3 deep. <br /> Table 4. <br /> L Soil Boring Log. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0-11 Brown,silty clay,cemented CL <br /> 11-19 Brown,silty clay CL \ <br /> 19-25 Brown,silty sand SM <br /> 5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow soils from on-site drilling indicates limited potential for <br /> percolation because of the fine-grained nature of the soils. The deeper zone between 19 to 25 feet <br /> has the greatest potential for percolation. 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, l <br /> sandy soils have much greater potential for percolation than fine-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 holes is included as Plate 1 in the appendix <br /> of this report l <br /> ` 6.2 Number of Percolation Tests <br /> One shallow and one deep percolation test were conducted on each proposed parcel of the Site for <br /> a total of four shallow and four deep percolation tests. <br /> 6.3 Boring Preparation and Presaturation <br /> Four deep and four shallow soil borings were drilled on the Site with a B53 augur rig on June 21, <br /> 2005. The percolation test holes were presaturated the same day. <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. "Pea gravel' <br /> was then used to backfill in the annular space. <br /> L Presaturation of the percolation test holes occurred on June 21,2005. The depth of water used to <br /> 7 <br /> %. '044 <br /> 6. <br />