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December 20,2004 <br /> NOA Project Number: E04139A <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 Permea Septic tank <br /> and Map (in) mmhos/cm Reaction bility absorption <br /> Ing Symbol pH (in/hr) fields <br /> Tokay fine 0-19: Fine sandy loam;SM <2 6.1 -7.8 2.0-6.0 Slight <br /> sandy loam, 19-45: Fine sandy loam,sandy loam;SM <2 6.1 -7.8 2.0-6.0 <br /> ■. 0-2% 46-60: Fine sandy loam,sandy loam, <2 6.1 -8.4 2.0-6.0 <br /> slopes,256. coarse sandy loam;SM <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> v 5.1 Soil Boring Locations <br /> A total of one soil boring was advanced on the Site. The boring was three feet in depth. The soil <br /> boring was used later for percolation test hole;the locations of the borings are indicated in Plate 1. <br /> ` 5.2 Soil Boring Dimensions <br /> The soil boring was 3 feet and w three inches in 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). Table 4 presents a representative soil log for the <br /> three foot deep soil boring. <br /> Table 4. <br /> Soil Boring Log for P-1. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0-0.5 Dark brown,moist,silty sand with clay SM <br /> 0.5-3.0 Brown,moist, sand with some silt SAI <br /> r• 5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow and soils from on-site drilling indicates potential for percolation <br /> because of the nature of the soils. A percolation test is the best method to determine the suitability <br /> of the soils. Please see the next section for percolation test results. Generally speaking, sandy soils <br /> have much greater potential for percolation than fine-grained soils. <br /> r. <br /> 6 <br />