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September 9,2005 <br /> NOA Project Number: E05112A <br /> i <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Surney <br /> to be composed of the Capay clay, 0-2% slopes,Capay clay,wet, 0-2% slopes, El Solyo, 0-2% slopes <br /> ! and Vernalis clay loath, 0-2% slopes (Plate 4) (USDA, 1992). Table 3 presents some selected <br /> properties of the soils: <br /> Table 3. <br /> t San Joaquin County Soil Survey <br /> Selected Soil Properties of On-Site Soils. <br /> Soil Depth Unified Soil Classification Salinity Soil Perme- Septic tank <br /> ` Name (in) mmhos Reaction ability absorption <br /> and Map /cm pH (in/hr) fields <br /> Symbol <br /> Capay 0-20: Clay:CH,CL <2 6.6-8.4 0.06- Severe:peres <br /> Clay,0-2% 20-60: Clay,silty clay:CL,CH <2 6.6-8.4 0.2 slowly <br /> slopes, 0.06- <br /> 118. 1 1 0.2 <br /> Capay 0-20: Clay-.CH,CL <4 6.6-8.4 0.06-0.2 Severe:percs <br /> Clay,wet, 20-44: Clay,silty clay:CH,CL <4 6.6-8.4 0.06-0.2 slowly <br /> 0-2% 4460: Silty day loam,clay loam:CL <4 6.6-8.4 0.06-0.2 <br /> slopes,121 <br /> _ El Solyo, 0-10 Clay loam:ML.,CL <2 6.6-7.8 0.2-0.6 Severe:peres <br /> 0-2% 10-60 Silty clay loam,silty clay:ML,MH,CL, <4 7.48.4 0.06-0.2 slowly <br /> slopes,156 CH <br /> Vernalis 0-9: Clay loam:CL <2 6.6-8.4 0.2-0.6 Severe:peres <br /> Clay 9-47: Loam,silt loam,clay loam:CL,CL ML <2 7.48.4 0.6-2.0 slowly <br /> Loam,0- 47-60: Stratified sandy loam to silty clay loam: <2 7.9-8.4 0.6-2.0 <br /> 2%slopes, CL,CL-ML <br /> - 268 <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> 7 <br />