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L <br /> L May 18,2005 <br /> NOA Project Number: E05059A <br /> Table 4. <br /> Soil Boring Log. <br /> ` Depth Interval(ft) o ype Unified Soil Classification <br /> 0-6 Brown,moist,clayey sand SC <br /> r, 6-13 Light brown,moist, ty sand,cemented SM <br /> 13-20 Li ht brown,moist,silty sand SM <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 /> 6 ercolation because of the sandy nature of the soils, though the clayey and cemented soils observed <br /> may hmit this potential. 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 /> 6 much greater potential for percolation than fine-grained or cemented soils. <br /> h' 6.0 PERCOLATION TEST INFORMATION <br /> 1/6.1 Percolation Test Locations <br /> L• A site map indicating the locations of the percolation test holes is included as Plate 1 in the appendix <br /> of this report. <br /> it <br /> /6.2 Number of Percolation Tests <br /> 6' One shallow and one deep percolation test were conducted on each parcel of the Site, for a total of <br /> two shallow and two deep percolation tests. <br /> 6" s�-,16.3 Boring Preparation and Presaturation <br /> Two deep soil borings were advanced on the Site with a truck-mounted deep rock augur rig on May <br /> 6. 5,2005. One shallow boring was advanced by hand-auguring on April 21,2005,and one shallow <br /> boring was advanced by hand-auguring on May 9, 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 /> L was then used to backfill in the annular space. <br /> L <br /> 8 <br /> L '004 <br /> L <br />