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I. Ff KtIIyFELD[R &,�55OC.`l �TEti <br />File No. 5-1147-19 <br />July 21, 1972 <br />PAGE FOUR <br />and grain -size characteristics of these materials. The tests <br />performed included moisture content and dry density determin- <br />ations, grain' -size analysis and hydrometer analyses. The <br />results of the moisture content and dry density determinations <br />are shown on the Logs of Borings with the corresponding <br />locations. The results of the g.,ain®size analysis are shown <br />graphically on Plate V. The hydrometer analyses are summarized <br />on Table II. <br />nTSCUSSTUN <br />Based on the hydrometer and grain -size analyses, we -have <br />made an evaluation of the permeability of the soil types <br />encountered. These estimates are not precise values., but are <br />intended to give an idea of the order of magnitude of <br />permeability. The estimated permeabilities are as follows: <br />. Coefficient of <br />Soil Type Permeability (Cm./Sec.) <br />Silty Clay 10®6 to 10`"7 <br />Sandy Clay 10- <br />Silty Sand 10-4 to 10_S <br />Clayey and Sandy Silt 10-6 <br />From our evaluation of the two test borings drilled <br />fcr this study and the laboratory tests, we conclude that the <br />soils in the two borings are primarily fine -drained cohesive <br />