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r <br />APPENDIX B <br />LABORATORY ANALYSIS <br />General <br />We completed laboratory analyses on selected soil samples obtained in the explorations. A series of <br />gradation tests have been conducted to determine the grain -size distribution of the soil samples. A Direct <br />Shear test was also conducted on one soil sample to evaluate the strength envelope of the upper site soils, <br />and to aid in slope stability analysis. The laboratory analyses were perfornmed to aid in our interpretation <br />and understanding of the subsurface soils and their engineering properties. <br />Grain -size — Gradations (ASTNI D-136) <br />The distribution of soil particles larger than 75 lun (retained on the No. 200 sieve) was determined by <br />sieving. The samples were dried in an oven overnight to determine the moisture content. The dried soil <br />was then allowed to pass through sieves of different sizes. The soil retained on each sieve was then <br />weighed and the weight was compared to the original amount of soil to determine the grain size <br />distribution of the sample. The gradation test results are shown in Figures B-1 through B-8 in this <br />appendix. <br />Direct Shear — (ASTNI D-3080) <br />A direct shear test was also perfmrnmed on a soil sample obtained from Boring B 2 at 20.0 feet. The <br />propose of the test was to obtain the internal friction angle and cohesion values for use in our slope <br />stability analyses. The direct shear test results are presented in Figures B 9. <br />NELSON GEOTECHNICAL ASSOCIATES, INC. <br />y1 <br />