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►. April 13, 2007 NOA Project Number: E07046A Table 4. Soil Boring Log. Depth Interval (ft) Soil Type Unified Soil Classification 0-1 Light brown,very moist,clay CL 1-3.5 Light brown,moist,day with some silt and sand CL 3.5-12.5 Light brown,moist,clay with some silt CL *No groundwater was encountered to a depth of 12.5 feet. 5.4 Discussion of Soil Lithology ` A visual inspectio of the shallow soils from on-site drilling indicates limited potential for satisfactory percola on. A percolation test is the best method to determine the suitability of the soils. Please see a next section for percolation test results. Generally speaking, coarser grained sor has c greater permeability than fine-grained soils. 6.0 PERCOLATION TEST INFORMATION 6.1 Percolation Test Locations A site map indicating the location of the percolation test hole is included as Plate 1 of this report. ` 6.2 Number of Percolation Tests One ow one p percolation test were conducted on the site, for a total of two percolation ` tests HD co i ers a hallow percolation test boring to be between 36 and 42 inches deep and a P percolation test oring to be a depth more than 42 inches up to a maximum depth of 25 feet. ` 6.3 Boring Preparation and Presaturation The soil borings were advanced with a hand augur on the site on April 8, 2007. A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of water in the percolation test boring. Approximately 2 inches of"pea gravel' were placed in the ` bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. "Pea gravel'% was then used to backfill in the annular space. 4 Presaturation of the percolation test holes occurred approximately 24 hours before the percolation- tests. The depth of water used to pre-soak was 12 inches above the bottom of the boring. 6. 7 A6