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%fto� 1.0e <br /> July 30,2005 <br /> NOA Project Number: E05089A <br /> Table 4. <br /> Soil Boring Log. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0.1 Dark brown,slightly moist clay CL <br /> 1-2 Lighter,moist silty clay with sand CL <br /> 2-8 Li ht brown,moist silt with sand at increasin de th ML <br /> 5.4 Discussion of Soil Lithology <br /> L A visual inspection of the shallow and deep soils from on-site drilling indicates potential for <br /> percolation because of the silty nature of the soils. A percolation test is the best method to <br /> determine the suitability of the soils. Please see the next section for percolation test results. <br /> Generally speaking, sandy soils have much greater potential for percolation than fine-grained or <br /> cemented soils. <br /> L <br /> 6.0 PERCOLATION TEST INFORMATION <br /> L6.1 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 /> One shallow percolation test was conducted on each lot at the Site, for a total of two shallow <br /> j percolation tests. <br /> L• 6.3 Boring Preparation and Presaturation <br /> LA total of two shallow soil borings were advanced on the Site by hand-auguring on June 28, 2005. <br /> L 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 28,2005. The depth of water used to <br /> pre-soak was 12 inches above the bottom of the borings. <br /> 8 <br /> L "044 <br /> L <br />