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Consulting Engineers and Geologists <br />Test Hole 6 when checked on June 16, 1981. The ground water <br />level recorded at this time was at elevation 6868 5 feet (2094.5 feet <br />(2094.9 meters )in Test Hole 6. <br />LABORATORY INVESTIGATION <br />General. Samples retrieved from the field were visually inspected and <br />grouped according to soil and bedrock types. Atterberg Limits were <br />conducted in order to further group the soils according to engineering <br />properties (refer to Appendix A). <br />Materials Classifications. The embankment soils tests showed four <br />major groups of soils. Group I soils are characterized as medium plast- <br />icity clays, the liquid limits ranging from 24 to 40 and plasticity <br />indices ranging from 9 to 27. These soils also have 60 to 93 percent <br />by weight passing the #200 sieve. Group II soils are characterized by <br />silty clays with a liquid limit of 24 and a plastic index of 6 and 64Sb <br />by weight passing the #200 sieve. Group III soils are characterized as <br />sandy clays with liquid limits ranging from 27 to 39, plastic indicies <br />ranging from 14 to 25, and 51 to 56 percent by weight passing the #200 <br />sieve. Group IV soils are classified as silt with some non-plastic <br />fines with liquid limits of 21, plastic indicies of 0 and 1 and 60 to <br />90 percent by weight passing the #200 sieve. Moisture contents for the <br />four groups of soils varies from 3.5 percent to 19.1 percent. natural <br />dry densities range from 96 pounds per cubic foot to ll4 pounds per cubic <br />foot. <br />Material Permeability. Laboratory falling head and constant head <br />permeability tests were conducted on samples retrieved from the field <br />in order to verify field permeability rates. Permeability test samples <br />were placed in sail permeameters and saturated. Using test procedures <br />as outlined by Lambe in his book "Laboratory Testing for Engineers", <br />(Bibliography Reference 5) samples were tested under variable or constant <br />head conditions. Sample calculations are presented in Appendix E. <br />-6- <br />