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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 />the left abutment, is immediately below a steep hillside. The <br />hillside, and a significant portion of the left side of the reservoir, <br />consists of older and some recent mud and/or landsl ides. The basal <br />rock formations in the general area of the dam consist of the various <br />flows and clastic sediments of the Conejos Andesite. These flows and <br />cl asti c sedi ments are very suscept i b 1 e to mass wast i ng processes and <br />many mud flows and landslides are found throughout the San Juan Range. <br />The 1 ands 1 i de to the west of the spi 11 way and spi 11 way channel has <br />resulted in considerable concern by the U.S. Forest Service since the <br />Forest Service's road actually passes through the upper portions of <br />the slide. <br /> <br />In summary, the main concerns of the Forest Service and State <br />Engineer with Fuchs Dam are: the sl ide problem; spillway channel <br />erosion; condition of existing spillway; and spillway adequacy to <br />handle the appropriate spillway design flood. This report presents <br />the results of the feasibility investigations of the rehabilitation of <br />Fuchs Dam in order to address the concerns summarized above. Included <br />herein is the prel iminary design of the recommended improvements to <br />the structure, including a cost estimate of the construction work. <br />Also included is an economic evaluation of the project. <br /> <br />- 1-2 - <br />