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Mr. Sandi De Jong <br /> September 25,2003 <br /> Page 8 <br /> Table 3. <br /> Selected Soil Properties of the Surrounding Area <br /> San Joaquin County Soil Survey Report. <br /> Soil Name and Map Depth(in) Unified Soil Salinity Soil Septic tank <br /> Symbol Classification mmhos/cm Reaction absorption <br /> pH fields <br /> San Joaquin sandy 0-12: Loam. CL-ML,ML <2 5.6-6.5 Moderate: <br /> loam,0 to 2 percent 12-26: Sandy clay SC <2 6.1-7.3 cemented pan. <br /> slopes,240. loam <br /> r 26-35: Clay loam, CL <2 6.1-7.8 <br /> loam <br /> 35-60: Indurated — — — <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> X5.3 Soil Lithology Observed and Septic Applicability <br /> Generally, the soil encountered in the borings is similar to the soils reported by the San Joaquin <br /> County Soil Survey soil for the area(USDA, 1992). Table 4 presents the soil log for the 14.5- <br /> foot deep soil boring. <br /> Table 4. <br /> Soil Boring Log. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0-12 Light brown silty sand,moderately cemented. SP(cemented) <br /> 12-14.5 Light brown/yellow sand SP <br /> Note: Descriptions are representative of soil conditions encountered in all four borings. <br /> Percolation rate is the best measure of septic system applicability. Based on the percolation rate <br /> ` of the shallow soil zone—described later in the report—, the shallow soil zone has not <br /> demonstrated satisfactory percolation rate according to the San Joaquin County Environmental <br /> y Health Department. However, the percolation rate of the deeper soil layer demonstrated <br /> satisfactory percolation rate. The utilization of seepage pits in conjunction with shallow leach <br /> lines would maximize the percolation potential of the area tested and probably represents the <br /> condition of the entire site. <br /> rocRso <br /> r 1 <br /> > r <br /> Z ' <br /> O � <br /> �SSpG\ <br />