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Traylor Shea Precast Page 6 of 14 Our Project Number: E071*B i November 29,2007 I.5.3 Soil Lithology Observed Generally, the soil encountered in the boring is similar to the soils reported by the San Joaquin County Soil Survey for the area (USDA, 1992). The table below presents the soil log for the soil boring. Table 4. Soil Boring L Depth Interval (ft) Soil Type Unified Soil Classification 0-2.5 Medium brown, silty clay CL 2.5-3.25 Black clay CL I.5.4 Discussion of Soil Litholoov A visual inspection of the soils from on-site drilling indicates some potential for percolation because of the nature of the soils. A percolation test is the best method to determine the / suitability of the soils for a septic disposal area. Please see the next section for percolation test results. Generally speaking, sandy soils have much greater potential for percolation than fine- grained or cemented soils. I.6 Percolation Test Information I.6.1 Percolation Test Locations A site map indicating the location of the percolation test hole is included as Plate 1 in the (o •I appendix of this report. I.6.2 Number of Percolation Tests r One shallow percolation test was conducted within the proposed septic disposal area on the Site. I.6.3 Boring Preparation and Presaturation One shallow soil boring was advanced on the Site with a hand auger on November 21, 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. Presaturation of the percolation test hole occurred prior to the test. The depth of water used to pre-soak was 12 inches above the bottom of the boring. 1. 1 .444 6 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02007 Neil O.Anderson&Associates,Inc