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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />while Atterberg limit determinations and a minus 200 grain size analy- <br /> <br />sis were performed on nine samples to facilitate soil classification. <br /> <br />The results of the laboratory testing program are summarized in Table <br /> <br />1 and the complete testing report is presented in Appendix A. <br /> <br />C. Summary of Field and Laboratory Geotechnical Investigations <br /> <br />All of the materials encountered during drilling were slide <br /> <br />materials probably originating upslope as the Mesa Verde formation. <br /> <br />No Mancos Shale WaS encountered in any of the holes. Water levels <br /> <br />were measured in the boreholes immediately after drilling. Water was <br /> <br />encountered at a depth of approximately 25 feet, in hole BH-I and <br /> <br />BH-3; all other holes were dry. Lon~ term static water levels are not <br /> <br />known at present. The Stewart Ditch had been shut off approximately <br /> <br />two days before drilling began and was not flowing during drilling <br /> <br />operations. Prior to the drilling the ditch had been operating for <br /> <br />several weeks. <br /> <br />The materials sampled in the boreholes Were non-plastic clays with <br /> <br />occasional pieces of sandstone. <br /> <br />The wet densities encountered Were <br /> <br />relatively high (mostly 130-140 pcf). <br /> <br />Occas ional thin and probably <br /> <br />isolated zones of weathered sandstone Was encountered. <br /> <br />The direct shear tests showed the slide materials to be very <br /> <br />strong in general. A zone of especially weak materials Was not iden- <br /> <br />II-4 <br />