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August 5, 2005 NOA Project Number: E05098A The surface and near surface soils located at the-Site are reported by the-San Joaquin County Soil Survey. to be composed of Bruella sandy loam,hard substratum, 0-2% slopes and San Joaquin loam, thick surface, 0-2% slopes (Plate 8) (USDA, 1992). Table 2 presents some selected properties of these soils: - Table 2. San Joaquin,County Soil Survey - Selected-Soil Properties°of On-Site Soils Soil Name Depth Unified Soil Classification_ Salinity Soil Pernie-. Septic tank and Map (in) mmhos/cm Reaction : ability absorption S mbol -pH_. (in/.hr) eld Bruella 0-8: Sandy loam;SC-SM;SM' <2 6.1 -73 2.0-6.0 Severe:peres sandy loam, 8-42: Sandy loam,sandy clay loam;SC <2 6.1 73— 0.2-0.G slowly hard... 42-60: Sandy clay loam,sandy clay;SC .<2 6.1 -7:3- 0.2-0.6 0.6 substratum, _ 0-2% San Joaquin 0-12: Loam;CL ML,ML <2 5.6-6.5 0.6-2.0 Severe: loam,thick 12-26: Sandy clay loam;SC <2 64 -7.3— 0.2-0.6 cemented surface, 26-35:_ Clay loam,clay;CL <2 6.1 -7.8 <0.06 pan,peres 0-2% 35-60: Indurated --- --- --- slowly slopes,240. Dote:The table descriptions do not necessarily reflect site-specific soil properties. Al Soil Boring Locations A total of four soil borings were advanced on the Site, two borings to a depth of approximately three feet and two borings to a depEh of around,25feet. -The soil borings we`re used-later for + percolation test holes; the locations of the borings are indicated in Plate 1. /5.2 Soil Boring Dimensions e soil borings were 25 feet or three feet-deep, as noted above;and were four inches in diameter. 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). Table 3 presents the representative soil log for the 25 --foot-deep soil boring. Conditions were comparable in the shallow boles. 6