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August 29, 2006 NOA Project Number: E06084A Fj 5.3 Soil Lithology Observed Generally,the soil encountered in the boring was not similar to the soils reported by the San Joaquin County Soil Survey for the area (USDA, 1992). Table 4 presents the soil logs for the three to three i and a half foot soil borings. Table 4. Soil Boring Log. Depth Interval(ft) Soil Type Unified Soil Classification Fj0-1 Light brown,very moist,sandy silt SM 1-3.5 Light brown,moist,sandy silt SM / 3.5-8.5 Light brown,moist,silty sand SM 5.4 Discussion of Soil Lithology F( A visual inspection of the shallow soils from on-site drilling indicates potential for satisfactory percolation. A percolation test is the best method to determine the suitability of the soils. Please see the next section for percolation test results. Generally speaking, coarser-grained soils have much / greater permeability than fine-grained soils. 6.0 PERCOLATION TEST INFORMATION 6.1 Percolation Test Locations I A site map indicating the locations of the percolation test holes is included as Plate 1 of this report. 6.2 Number of Percolation Tests Two"shallow" percolation tests were conducted in the proposed septic disposal areas of the Site, for a total of two shallow percolation tests. EHD considers a shallow percolation test boring to be Fjbetween 36 and 42 inches deep. 6.3 Boring Preparation.and Presaturation The soil borings were advanced with a hand augur on the site on July 16, 2006. 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 r # 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. I � .