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<br />,. <br />I <br />,. <br />I <br /> <br />. <br />. <br />. <br />. <br />. <br />. <br />I <br />I <br />I <br />I <br />I <br />. <br />I <br />. <br />I <br />I <br />I <br /> <br />WCC supervised the drilling and sampling operations, The test holes were drilled by <br />Drilling Engineers. Inc. under subcontract to WCC. The test holes were drilled using <br />3.75-inch 1.0, hollow stem augers powered by a truck-mounted CME-55 drill rig. In all <br />fIVe test holes, a field-slotted. glued-joint PVC stand pipe was inserted Into the hollow <br />stem auger. The annulus between the stand pipe and the test hole wall was filled with <br />silica filter sand as the hollow slem augers were removed, <br /> <br />Test holes were generally sampled at 5-Ioot intervals. Samples were obtained using <br />either a two-inch 0,0. standard split-spoon sampler or a two-inch 1.0. California sampler <br />driven by a 140-pound hammer falling 30 inches. The penetration resistance of the <br />sampler (blow count) was recorded in blows per 12 inches or less. California samples <br />were retained in 2-inch diameter by 4-lnch long brass tubes sealed with plastic caps <br />after removal from the sampler, When recovery problems were encountered with the <br />California sampler, the split-spoon sampler was used, Split-spoon samples were saved <br />by placing them In brass tubes with plastic caps. Summary logs of the test holes are <br />shown on Figure 2, Water Iewls in the test holes were measured upon completion of <br />drilling, or one day later. <br /> <br />In addition, one sample of potential borrow material was obtained by representatives of <br />the City. The sample was a composite from four test pits 1 ~ to 2 feet deep, excavated <br />in the vicinity of Station 10+00, upstrearn from the embankment. This sampling <br />operation was not observed by weC. <br /> <br />5,3,2.2 Laboratory Investigations <br /> <br />Laboratory investigations were performed to provide Information about the engineering <br />properties of the soil at the sile. Laboratory tests conducted on soil samples for the <br />feasibility study include gradalion. natural moisture content, natural density, Atterberg <br />limits, specific gravity, and triaxial shear strength, The results of the laboratory <br />investigations are presented in Table 1 and Figures 6 through 10. <br /> <br />5-10 <br />