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-35- <br />Fill material was also encountered at the surface of Test Pit 8. <br />This fill was similar in character to the material encountered in <br />Test Pits 3 and 6. However, the material was in a relatively <br />loose condition and contained concentrations of frozen ground and <br />wood fragments. <br />(2) Natural Soils: Based on the laboratory test results, the clay <br />soils encountered at the site are sandy to very sandy, containing <br />minor percentages of fine to medium sand and traces of angular <br />gravels, cobbles and boulders to 4 feet in diameter. These clays <br />are calcareous in places, dry to light Hoist and brown, green and <br />red -brown in color. Based on the moisture-density test results, <br />the clays appear to be very stiff to hard in consistency. <br />Swell - consolidation tests conducted on relatively undisturbed <br />samples of the materials indicate that the clays exhibit low <br />volume change when saturated under low loads. Samples from Test <br />Pit 4 at a depth of 3.5 feet and Test Pit 9 at a depth of <br />6.5 feet exhibited a low swell potential when saturated under <br />1,000 psf loading. A sample from Test Pit 5 exhibited a small <br />amount of collapse when saturated under the same loading. <br />The strength Characteristics of the clay soils at the site were <br />investigated by conducting a direct shear test on a sample of the <br />clay obtained from Test Pit 1 at a depth of 8 feet. The direct <br />shear test results (Fig. 16) indicate that the clay soils have a <br />saturated, drained friction angle of 24° and a cohesion <br />intercept of .8 kips per square foot. The strength data obtained <br />in the laboratory testing correlates well with published <br />