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r L LJune 23,2006 NOA Project Number: E06058B j Table 4. `- San Joaquin County Soil Survey Selected Soil Properties of On-Site Soils. Soil Name Depth Unified Soil Classification Salinity Soil Penne- Septic tank and Map (in) mmhos/cm Reaction ability absorption Symbol pH (in/hr) fields Bruella 0-8: Sandy loam;SC-SM,SM <2 6.1 -7.3 2.0-6.0 Severe:peres sandy loam, 8-42: Sandy loam,sandy clay loam;SC <2 6.1 -7.3 0.2-0.6 slowly hard 42-60: Sandy clay loam,sandy clay;SC <2 6.1 -7.3 0.2-0.6 substratum, 0-2% slopes,112. SanJoaquin 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 6.1 -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 slo es,240. Note:The table descriptions do not necessarily reflect site-specific soil properties. L J 5.1 Soil Boring Locations I A total of four soil borings were advanced on the Site, two borings to a depth of about three feet 6. and two borings to a depth of approximately ten and fifteen feet. The soil borings were used later for percolation test holes;the locations of the borings are indicated in Plate 1. L /5.2 Soil Boring Dimensions The soil borings were ten, fifteen feet or about three feet deep, as noted above,and were four inches Lin diameter. L A3 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 following table presents the representative soil {` log for the nine foot deep soil boring. Conditions were comparable in the shallow holes. Table 6. Soil Boring Log. Depth Interval(ft) Soil Type Unified Soil Classification 0-10 Brown,moist clayey silt ML 9-15 Brown,moist,sandy silt,cemented SM 7