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<br />- <br /> <br />Chapter V - Evaluation of Alternatives <br /> <br />the main gate were to fail. Table V-2 lists the cost associated with constructing the upstream gate <br />alternative. The estimated construction cost with construction engineering and 20 percent contingencies <br />is $252,000. <br /> <br />C.2 Alternative 2 - Gate Chamber <br /> <br />This alternative would be the more difficult to construct, than the upstream gate, due to the <br />close construction area within the existing gate chamber. The sleeving of the upstream pipe becomes <br />more critical than the upstream control since the pipe will be under pressure during normal operation. <br />The option has been used very successfully in rehabilitating outlet works. This approach will enable the <br />Company to inspect the gates easier, but on the other hand would require the reservoir to be drained to <br />inspect the upstream pipe section. Table V -3 lists the cost associated with constructing the gate <br />chamber. The estimated construction cost with construction engineering and 20 percent contingencies is <br />$303,000. <br /> <br />C.3 Alternative 3 - Gate Tower <br /> <br />The gate tower alternative would require the longest construction period due to the tower and <br />bridge component of the alternative. The alternative would allow an emergency or backup gate if the <br />main gate were to fail. The systern would not pressurize the outlet pipe. Inspection of the outlet works <br />would be easier than the other alternatives. The alternative would have to highest construction cost <br />compared with the other alternatives. Table V-4 lists the cost associated with constructing the gate <br />tower. The estimated construction cost with construction engineering and 20 percent contingencies is <br /> <br />$604,000. <br /> <br /> <br />Horseshoe Dam No.2 Outlet Works Study <br /> <br />26 <br /> <br />BOYLE <br />