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f <br /> ` December 23 2005 <br /> NOA Project Number: E05174A <br /> �.3 Soil Lithology Observed <br /> F; Generally, the soil encountered in the boring is similar to the soils reported by the San Joaquin <br /> F1 <br /> County Soil Survey for the area (USDA, 1992). Table 4 presents the soil log for the three foot deep <br /> soil boring. <br /> F` Table 4. <br /> Soil Boring Lo <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> F0-2.5 Rusty brown,moist,clayey sand and gravel. SC <br /> 2.5-3.0 Coa�vel and cobble with clayey sand matrix. GP <br /> F \ Auger refusal at 3.0 feet. <br /> i <br /> x/5.4 Discussion of Soil LithoIogy <br /> Ff <br /> A visual inspection of the shallow soils frorn on-site drilling indicates the possibility of potential <br /> c percolation due to the presence of the sand,gravel, and cobbles. A truck mounted Deep Rock rig} <br /> operated by Neil O. Anderson&Associates, Inc. had encountered auger refusal at 3.0 feet in depth <br /> in large gravel or cobble on December 19, 2005. Due to the size of gravel and cobble, it is <br /> questionable whether a large bucket auger rig would be capable of excavating seepage pits at the <br /> location of the percolation test. <br /> t The nature of the fine grained matrix which consists of clayey sand is expec d th 1 ting factor <br /> with respect to percolation. Generally speaking, sandy soils have much greater potential for <br /> percolation than fine-grained soils. <br /> A percolation test at a depth of 3.0 feet was performed to determine the suitability of the soils. <br /> Please see the next section for percolation test results. <br /> �C <br /> { <br /> f ' <br /> 9 <br /> f �; <br />