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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />J <br />I <br />I <br />I <br />I <br />I <br />-, <br />I <br />I <br />I <br />I <br /> <br />Woodward. Clyde Consultants <br /> <br />5.2 GEOLOGICAL INVESTIGATIONS <br /> <br />Woodward-Clyde Consultants conducted a geotechnical investigation in early October <br />1990 for the proposed rehabilitation of Douglas Dam. A draft copy of the investigation <br />is included in Appendix F of this text. A description of the general geology of the <br />project area is presented in Appendix D. <br /> <br />5.3 DESIGN <br /> <br />References used for design criteria and evaluation for the rehabilitation of the proposed <br />dam include: <br /> <br />· "Design of Small Dams", United States Bureau of Reclamation. <br /> <br />· "Current Trends in Design and Construction of Embankment Dams", American <br />Society of Civil Engineers. <br /> <br />· "Safety of Existing Dams, Evaluation and Improvement", NRC. <br /> <br />The hydrological and hydraulic study used for the design and evaluation of the spillway <br />was conducted by Riverside Technology Inc. in 1987 for Leibert-McAtee & Associates <br />and is presented in Appendix E. <br /> <br />5.4 STRUCTURE PLANS <br /> <br />5.4.1 Embankment <br /> <br />Several alternatives were considered for the rehabilitation of Douglas Dam embankment. <br />The alternatives considered include: construction of a cement-bentonite slurry wall along <br />the axis of the dam; construction of a slurry wall, upstream clay blanket and flattened <br />downstream slope; and removal and replacement of the embankment above the existing <br />outlet works. <br /> <br />22539G/DOUGl.AS.DAM 12-17-90/REPORTS3 <br /> <br />23 <br />