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March 28,2005 <br /> NOA Project Number: E05007B <br /> Table 5. <br /> Soil Boring Log for Designated Remainder. <br /> Depth Interval (ft) Soil Type Unified Soil Classification <br /> 0-1 Light brown,very moist,clay CL <br /> 1-3.0 Light brown,moist,clay with some silt and sand CL <br /> 5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow soils from on-site drilling indicates some potential for satisfactory <br /> percolation. A percolation test is the best method to determine the suitability of the soils. Please <br /> .. see the next section for percolation test results. Generally speaking,gravelly soils have much greater <br /> permeability than fine-grained soils. <br /> 6.0 PERCOLATION TEST INFORMATION <br /> hm 6.1 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 Number of Percolation Tests <br /> .. One shallow percolation test was conducted on each proposed parcel of the Site, for a total of two <br /> shallow percolation tests. <br /> i■. 6.3 Boring Preparation and Presaturation <br /> The soil borings were advanced with a hand augur on the Designated Remainder on February 24, <br /> `m 2005 and on Parcel 1 on March 8,2005. <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. 'Tea Gravel" <br /> was then used to backfill in the annular space. <br /> Presaturation of the percolation test holes on the designated remainder Sunday, February 27,2005. <br /> Presaturation of the percolation test holes on Parcel 1 occurred on March 9, 2005. The depth of <br /> water used to pre-soak was 12 inches above the bottom of the boring. <br /> 8 <br />