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September 21,2005 NOA Project Number: E05104A Table 2. 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/ Reaction ability absorption Symbol cm pH (in/hr) fields Jacktone 0-22 Clay,CL,CH <2 6.6-8.4 .14.16 Cemented clay,0-2% 22-34 Clay loam,clay,silty clay,CL,CH <2 7.9-9.0 .14.16 pan,peres slopes,180 3437 Indurated --- --- --- slowly 37-46 Loam,clay loam,CL-ML,CL <2 7.9-9.0 .2-.6 46-60 Cemented -- -- --- Stockton 0-16 Fine sandy loam,SM <2 7.48.4 2.0-6.0 Severe:peres fine sandy 16-53 Clay,silty clay,CL,CH <2 7.48.4 .06-.2 slowly laom,0-2% 53-58 Clay loma,silty clay loam,CL, <2 7.9-8.4 .06-.2 slopes,248 ML --- -- 58-60 Cemented -- Stockton 0-12 Silty clay loam,ML <2 7.48.4 .2-.6 Severe:peres clay,0-2% 12-34 Clay,silty clay <2 7.48.4 .06-.2 slowly slopes,249. 3447 Clay loam,silty clay loam,CL, <2 7.48.4 .06-.2 ML 47-60: 1 Cemented -- j Note:The table descriptions do not necessarily reflect site-specific soil properties. L 5.1 Soil Boring Locations A total of fourteen soil borings were advanced on the Site, seven borings to a depth of / approximately three feet and seven borings to a depth of about 25 feet. The soil borings were used Llater for percolation test holes; the locations of the borings are indicated in Plate 1. \ 5.2 Soil Boring Dimensions LThe soil borings were approximately 25 feet or three feet deep,as noted above,and were four inches in diameter. 53 Soil Lithology Observed Generally,the soil encountered in the borings 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 borings. Conditions were comparable in the shallow holes. L L L 7 '004 L