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LMay 17,2005 NOA Project Number: E04146B/ L ✓ 5.3 Soil Lithology Observed i Generally, the soil encountered in the boring is similar to the soils reported by the San Joaquin L County Soil Survey for the area (USDA, 1992). Table 4 presents a soil log for the 3.6-foot deep soil boring. Conditions were comparable in the shallower holes. Table 3. Soil Boring Log. Depth Interval(ft) Soil Type Unified Soil Classification ` 0-2 Medium brown,moist,fine to medium sandy clay SC 2-3.6 Dark brown,very moist,medium to coarse sand cla SC 15.4 Discussion of Soil Lithology L A visual inspection of the shallow and deep soils from on-site drilling indicates little potential for percolation because of the clayey nature of the soils. A percolation test is the best method to L determine the suitability of the soils. 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. L 0 PERCOLATION TEST INFORMATION L6.1 Percolation Test Locations L A site map indicating the locations of the percolation test holes is included as Plate 1 in the appendix of this report. k116.2 Number of Percolation Tests L One shallow percolation test was conducted on each lot at the Site, for a total of two shallow Lpercolation tests. /6.3 Boring Preparation and Presaturation LA total of two shallow soil borings were advanced on the Site by hand-auguring on May 2,2005. L 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. 'Tea Gravel' Lwas then used to backfill in the annular space. 7 L L