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March 15,2007 <br /> NOA Project Number: E07031A <br /> b. <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Survey <br /> to be composed of the Timor loamy sand,0-2 % slopes (Plate 8). The following table presents <br /> v some selected properties of the soils: <br /> Table 2. <br /> San Joaquin County Soil Survey <br /> Selected Soil Properties of On-Site Soils. <br /> Soil Name Depth Unified Soil Classification Salinity Soil perme- Septic tank <br /> and Map (in) mmhos/c Reaction ability absorption <br /> Symbol in pH (in/hr) fields <br /> Timor 0-14: Loamy sand;SM <2 6.6-7.8 6.0-20 Severe:poor <br /> loamy sand, 14-56: Loamy sand,loamy coarse sand; <2 7.48.4 6.0-20 filter <br /> 0-2% SM <br /> slopes,254. 56-60: Cemented --- --- --- <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> 5.1 Soil Boring Locations <br /> 6. One soil boring was advanced on the site to a depth of approximately three and a half feet.The s <br /> boring was used later for percolation test holes;the location of the boring is indicated in Plate <br /> 5.2 Soil Boring Dimensions <br /> y„ The soil boring was approximately three and a half feet deep, as noted above, and was four inches in <br /> diameter. <br /> 5.3 Soil Lithology Observed <br /> Generally, 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). The table below presents the soil log for the soil <br /> boring. Table 3. <br /> Soil Boring Lo <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0-3 ;Medium brown,silty sand with some clav Sc <br /> r <br /> 5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow soils from on-site drilling indicates potential for satisfactory <br /> percolation. A percolation test is the best method to determine the suitability of the soils. Please <br /> ` see the next section for percolation test results. Generally speaking, coarser-grained soils have much <br /> greater potential for percolation than fine-grained soils. <br /> 6 <br />