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-2- <br />• were performed in addition to the sieve analyses on samples <br />No. 2 and 5. <br />The summary of laboratory testing is presented in Table <br />A-1. It shows that most soils are sandy or sandy-silty clays <br />with the exception of the terrace deposits that are classified <br />as sandy gravels. <br />GRADATION ANALYSES <br />Sieve and hydrometer analyses determined the amount and <br />size distribution of the soil particles. The tests assist in <br />accurate classification of the soils and enable a quantitative <br />comparison of soils of individual types. The test results <br />are shown in Tables A-2A through A-2C, Identification Test <br />Summary. <br />ATTERBERG LIMITS <br />The liquid and plastic limits of all samples were determined <br />to enable accurate classification of silty and clayey soils, and <br />to assist in the evaluation of their mechanical characteristics. <br />The results of these tests are presented in Tables A-2A through <br />A-2C, Identification Test Summary. <br />COMPACTION TESTS <br />Compaction tests (Standard Compaction Test, ASTM 698-78, <br />Method A) have been performed on all five samples. The purpose <br />• of these tests is to determine a moisture-density curve compar- <br />able to that of the same material when compacted in the field. <br />