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i_ <br /> April 13, 2007 <br /> NOA Project Number: E07046A <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 Calla-Carbona complex, 8-30%slopes and Carbona clay loam, 2-8% slopes <br /> (USDA, 1992;Plate 4). Table 3 presents some selected properties of these soil types: <br /> Table 3. <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/cm Reaction ability absorption <br /> Symbol pH (in/hr) fields <br /> Calla- 0-11: Clay loam;CL <2 7.4- 8.4 0.2-0.6 Severe:peres <br /> Carboni,8-30 I1-29: Clay loam;CL <2 7.4-8.4 0.2-0.6 slowly. <br /> %slopes, 113. 29-60: Clay loam;CL <2 7.4-8.4 0.2-0.6 <br /> Carbon clay 0-6: Clay loam;CL <4 7.4-8.4 0.06-0.2 Severe:peres <br /> loam,2-8% 6-25: Clay loam,day;CL,CH <4 7.4-8.4 0.06-0.2 slowly. <br /> slopes,123 25-36: Clay loam,clay,CL,CH <4 7.9-8.4 0.06-0.2 <br /> 36-62: Clay loam,CL <4 7.9-8.4 0.2-0.6 <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> 5.1 Soil Boring Locations <br /> Two percolation test holes were advanced on the site to depths of apro rely three and a half <br /> feet and 12.5 feet. No groundwater was encountered.The booing-Itest hole used later for - <br /> percolation test holes; the location of the botings is indicate in Plate 1. / <br /> 5.2 Soil Boring Dimensions <br /> The percolation boxings were approximately three and a half feet deep and 12.5 feet deep,as noted <br /> above, and were four inches in diameter. <br /> 5.3 Soil Lithology Observed <br /> Generally, the soil encountered in the borings is similar to the soils reported by the San Joaquin <br /> County Soil Sung for the area (USDA, 1992). Table 4 presents the soil logs for the 12.5 foot soil <br /> L boring. f <br /> L <br /> 6 <br /> L. <br />