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<br />, 'I <br />I I <br />'I <br /> <br />, <br /> <br />:1 <br /> <br />, <br /> <br />II <br />I <br />:1 <br />II <br />II <br />II <br />II <br /> <br />4-2 <br /> <br />Generalized geological conditions are presented at a small scale in <br />Figure 2. <br /> <br />4.4 Geophysical Investigations <br /> <br />Douglas-Robertson and Associates, Inc., Consulting Geologists and Mining <br />Engineers of Golden, Colorado, were retained for limited investigation of <br />geophysical conditions at the proposed dam site. Ueb1acker Associates, Inc., <br />selected the locations of the geophysical profiles. Those locations were <br />selected on the bases of (a) contract limitations, (b) the desires of the <br />District in terms of dam location, and (c) our interpretations of subsurface <br />conditions as reflected by preliminary mapping of the abubnent areas. The <br />locations of the geophysical profiles are shown on Plates 2 and 5. The <br />results of these investigations are presented in Appendix C. <br /> <br />, <br />il <br />II <br />I <br />II <br />II <br /> <br /> <br />, <br /> <br />,I <br />I <br />I <br /> <br />4.5 Drilling and Down-the-Ho1e Testing <br /> <br />Three holes were drilled to a depth of 200 feet in the physiographic <br />floodplain at the proposed dam site. The locations of these holes are shown <br />on Plates 2 and 5.' The holes were drilled by Drilling Engineers, Inc., of <br />Fort Collins, Colorado, utilizing a truck-mounted CME 55 rig. The alluvium, <br />which extended down to depths of some 50 feet, was drilled with 6 inch 0.0. <br />hollow flight augers and was sampled with a standard split spoon device which <br />was used to determine penetration blow counts (ASTM Standard Penetration <br />Test). Upon reaching bedrock the holes were cased. Bedrock was sampled by <br />continuous coring to total depth by 10-foot cores at NX diameter. The cores <br />were logged in detail and photographed. These cores are being retained by <br />Ueb1acker Associates, Inc., for examination and/or future testing. The logs <br />of the test holes are presented in Appendix O. <br /> <br />Selected intervals of both alluvium and bedrock were tested for <br />permeability utilizing a sophisticated down-the-hole packer device. The <br />equipment, test procedure and results obtained from packer testing are <br />discussed in Appendix E. <br /> <br />UEBLACKER ASSOCIATES. INCo <br />