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i <br /> 60 <br /> L July 28, 2006 <br /> NOA Project Number: E05167B <br /> I Table 3. <br /> 6. San Joaquin County Soil Survey <br /> Selected Soil Properties of On-Site Soils. <br /> r Soil Name Depth Unified Soil Classification Salinity Soil Perme- Septic tank <br /> and Map (in) mmhos/cm Reaction ability absorption <br /> Symbol pH (in/hr) fields <br /> Hollenbeck 0-10 Silty clay,CH-CL <2 6.6-8.4 .06-.2 Severe: <br /> silty clay,0- 10-37 Clay,silty clay,CH-CL <2 6.6.8.4 .06-.2 peres slowly <br /> 2%slopes, 37-42 Silty clay loam,clay loam,CL --- 6.6-8.4 .2-.6 <br /> 173 42-60 Cemented <2 --- --L--- <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> 5.1 Soil Boring Locations <br /> A total of two soil borings were advanced on the Site,one boring to a depth of approximately three <br /> Lfeet and one boring to a depth of around 20 feet. The soil borings were used later for percolation <br /> test holes;the locations of the borings are indicated in Plate 1. <br /> r <br /> 5.2 Soil Boring Dimensions <br /> The soil borings were approximately three or 20 feet deep, as noted above, and were four inches in <br /> L diameter. <br /> 5.3 Soil Lithology Observed <br /> LGenerally,the soil encountered in the boring is similar to the soils reported by the San Joaquin <br /> County Soil Survey for the area (USDA, 1992).Table 4 presents a soil log for the 20 foot deep soil <br /> boring. Conditions were comparable in the shallow hole. <br /> Table 4. <br /> Soil Boring Log. <br /> Depth Interval (ft) Soil Type Unified Soil Classification <br /> 0-7 Medium brown,moist clayey fine sand SC <br /> 7-15 Light brown,moist,silty fine sand with clay SM <br /> 15-20 Gray,moist,silry fine sand with clay SM <br /> V <br /> 5.4 Discussion of Soil Lithology <br /> i <br /> A visual inspection of the shallow and deep soils from on-site drilling indicates some potential for <br /> percolation of the deep percolation test hole because of the sandy nature of the soils. A percolation <br /> Ltest is the best method to determine the suitability of the soils. Please see the next section for <br /> 6 <br /> L "044 <br />