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September 9,2005 NOA Project Number: E05011B The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Survey to be composed of Galt clay, Hollenbeck silty clay,Jacktone clay and Stockton clay, all 0-2% slopes (6• ) (Plate 8) (USDA, 1992). Table 3 presents some selected properties of these soils: Table 3. San Joaquin County Soil Survey Selected Soil Properties of On-Site Soils. Soil Name Depth Unified Soil Classification Salinity Soil Perme- Septic tank and Map (in) mmhos/cm Reaction ability absorption Symbol pH (in/hr) fields Galt clay, 0-25 Clay,CL-CH <2 6.6-7.3 .06-.2 Severe: 0-2% 25-34 Clay,silty clay,CL-CH <2 6.6-8.4 .06-.2 cemented slopes,160 34-60 Cemented --- --- --- pan,peres slowly Hollenbeck 0-10 Silty clay,CH-CL <2 6.6-8.4 .06-.2 Severe: silty clay,0- 10-37 Clay,silty clay,CH-CL <2 6.6-8.4 .06-.2 peres slowly 2%slopes, 37-42 Silty clay loam,clay loam,CL --- 6.6-8.4 .2-.6 173 42-60 Cemented <2 --- --- Jacktone 0-22 Clay,CL,CH <2 6.6-8.4 .06-.2 Cemented clay,0-2% 22-34 Clay loam,clay,silty clay,CL- <2 7.9-9.0 .06-.2 pan,peres slopes,180 CH slowly 34-37 Indurated --- --- --- 37-46 Loam,clay loam,CL-NE,CL <2 7.9-9.0 .2-.6 46-60 Cemented --- Stockton 0-29: Clay;CL,CH <2 7.4-8.4 0.14-0.16 Severe:peres clay,0-2% 29-37: Clay,silty clay;CL,CH <2 7.4-8.4 0.14-0.16 slowly slopes,250. 37-42: Clay loam,silty clay loam;CL <2 7.4-8.4 0.14-0.17 42-60: Cemented I --- I --- I --- Note:The table descriptions do not necessarily reflect site-specific soil properties. 5.1 Soil Boring Locations A total of 8 soil borings were advanced on the Site, four borings to a depth of approximately three feet and four borings to a depth of around 25 feet. The soil borings were used later for percolation 1 test holes; the locations of the borings are indicated in Plate 1. 5.2 Soil Boring Dimensions The soil borings were approximately three or 25 feet deep,as noted above,and were four inches in diameter. 6