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-16- <br />LABORATORY TESTING <br />.General <br />Representative soil samples obtained from borings were subjected to labora- <br />tory testing to aid in their identification and to investigate their important <br />engineering properties. The results of these tests enable comparison with soils <br />encountered in previous borings in the general area and with the material <br />properties assumed for analyses in the preliminary design recommendations. The <br />tests used are discussed and their results presented in the following subsec- <br />II tions. <br />Gradation Analyses <br />Sieve analyses were performed on selected samples to determine the amount <br />and size distribution of their granular portion. These tests assist in accurate <br />classification of the soils and enable a quantitative comparison of soils from <br />different locations. These test results are shown on Plates A-7a and A-7b, <br />Gradation Test Results. <br />IAtterberg Limits <br />The liquid limit and plastic limit of selected samples were determined to <br />enable accurate classification of silty and clayey soils, and to assist in the <br />evaluation of their mechanical characteristics. The results of these tests are <br />presented on the gradation curves, Plates A-7a and A-7b. <br />Moisture and Density Determinations <br />Natural moisture contents and in situ densities were determined for all <br />soil samples tested in the laboratory. Moisture contents give a measure of the <br />degree of saturation of the subsurface soils. These data are presented on the <br />boring logs and on the Summary of Laboratory Test Results, Plate A-g. <br />ccaNroao ea+w~n-rc, iNe. <br />