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., <br /> I <br /> LEMSMILL-MERKEMMOF'F, INC. <br /> "'��• 3.2 SOIL SIEVE ANALYSIS <br /> As previously discussed, representative discrete soil samples were taken from the <br /> continuous core of soil boring SBI to verify the classification of the soil <br /> samples by the Unified Soil Classification System (USCS) . The results of the <br /> sieve analysis are included in Appendix C and are summarized in Table 1 : <br /> Table 1 <br /> Weber Point <br /> Sieve Analysis Results <br /> Sample Depth <br /> Number (Ft) % Gravel 9. Sand 7. Clay Soil Type <br /> SBI-13 13.0 0.0 15.9 84.1 Brown Lean Clay <br /> with sand (CL) <br /> SBI-23 22.6 0.2 21 .5 78.3 Brown Lean Clay <br /> with sand CL <br /> S81-25 25.4 2.0 5.1 92.8 Brown Fat Clay CH <br /> SBI-30 30.4 0.0 7.6 92.4 Gray Lean Clay CL <br /> SBI-35 35.2 0.0 15.6 84.4 Gray Lean Clay <br /> with sand (CL) <br /> The soil composition and soil types show that the iithoiogy at this site above <br /> 35 feet is predominately clay. The percentage of clay in the samples ranged from <br /> 78% to 92% with inversely corresponding sand composition ranging from 22% to 89.. <br /> Gravel -sized sand was found in only two of the samples at 2% or less composition <br /> by weight. The clays varied from brown to gray and were primarily lean clays <br /> with one sample classified as a fat clay. The field geologist collecting the <br /> samples noted that some of the clays appeared silty. <br /> Figure 4 shows a photograph of the continuous core for soil boring SBI and <br /> illustrates the color and texture changes described above. <br /> 3.3 GEOLOGIC CROSS-SECTION <br /> An interpretive geologic cross-section was prepared based on geologic information <br /> obtained from the soil borings and monitoring well borings. Figure 3 shows the <br /> locations of LH's soil borings, monitoring well borings and the cross-section <br /> lay-out, A-A' . Cross section A-A' is a northwest-southeast cross-section <br /> including borings MW2, SB3, 564, and S81 and is shown in Figure 5. <br />- � 10 <br />