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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 />Chapter IV . Formulation of Alternatives <br /> <br />A.3 Alternative 3 - Microtunneling <br /> <br />The microtunneling alternative is very similar to the cut and cover alternative with one major <br />change. Rather than installing 170 feet of steel pipe using cut and cover operations, followed by 80 <br />feet of RCP installed by microtunneling; 250 feet of 48-inch mortar-lined steel pipe would be <br />~ .I" . S t--I C) <br />installed in this section using microtunneling. The 250 feet of exiting arch tunnel in the section <br />where microtunneling is utilized would be filled with grout. The 50-feet of mortar-lined pipe leading <br />into the gate chamber, the gate chamber itself, and the outlet downstream of the microtunneling <br />would be the same as Alternative 1. This alternative is presented in Figures IV -2 and IV-4. <br /> <br />Boyd Lake Dam Outlet System Feasibility Study <br /> <br />13 <br /> <br />1f30VLE <br />