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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 />3) The reservoir level can be left at approximately the <br />historic average (S099 feet) for October rather than <br />drastically lowering it, which would have an adverse <br />impact on the fishery. <br />4) The cost to construct a steel plug is about the same as <br />the frame or barge but less than a helicopter. <br />5) The most important advantage of the fabricated plug is <br />that an 8-inch butterfly valve will be constructed in the <br />plug so that downstream releases can be made through the <br />valve into the existing outlet pipe. While one gate is <br />being repaired, water will be routed through the other <br />gate. This saves at least $25,000 in pump installation <br />and pumping costs plus it eliminates potential problems <br />with the operation of the pumps. <br /> <br />The <br />the plug <br /> <br />construction of the plug, <br />are described in detail in <br /> <br />and placement and removal <br />the following section. <br /> <br />of <br /> <br />6.2 FABRICATED STEEL PLUG <br />The steel plug will consist of wide flanged steel beams (10 <br />inch x 10 inch) welded together to form an S-foot diameter plate. <br />The plug will weigh about 1700 pounds in air. A hole will be <br />placed in the plug in order to allow for the installation of an <br />S-inch butterfly valve (plug valve). The butterfly valve will be <br />remotely operated from the surface of the reservoir to allow <br />closing of the valve to totally dewater the outlet. About 14 cfs <br />can pass through the valve at the estimated reservoir water <br />surface of S090 ft. A small, 2-inch, hole will also be included <br />in the plug to allow a venting pipe that will extend above the <br />water surface; this will allow air to enter and leave the tunnel. <br /> <br />A bulkhead will be used to divert water into one barrel of <br />the outlet gate to allow the other gate to be disassembled. The <br />outlet will have to be totally dewatered to allow the work crew to <br />place the bulkhead in front of the gate being disassembled. The <br />bulkhead will be made of rubber and steel. <br />6.0-5 <br />