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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 />FORMULATION AND EVALUATION OF ALTERNATIVES <br /> <br />Alternatives <br /> <br />A range of structural alternatives was evaluated for the upstream slope <br />protection repair on Jackson Lake Reservoir Dam. It is proposed to repair the entire <br />upstream face of the dam; however, funding shortfalls may limit the actual repair to the <br />critical areas of the dam. The alternatives evaluated included the following: <br />1) Do Nothing. <br />2) Continue Current Practice of Limited Slab Replacement. <br />3) Improved Program of Slab Replacement. <br />4) Resurface the Upstream Slope with a Soil Cement Overlay. <br />5) Beach the Upstream Slope and Armor. <br />6) Flatten the Upstream Slope to 2(H):1 (VI and Armor against Wave Action. <br /> <br />Options 4, 5 and 6 include several sub-alternatives, using the basic concept with <br />modified design details. These Include: <br />4-4) Resurface with Soil Cement to Elevation 40.5 <br />4-1) Resurface with Soil Cement to Elevation 36.5 <br />4-6) Resurface with Soil Cement to Elevation 36.5, Limited Length <br />5A) Beach the Upstream Slope at a 10(H):1 (V) Slope and Armor with Gravel. <br />5B) Beach the Upstream Slope at a 5(H):1 (VI Slope and Armor with Soil Cement. <br />6A) Flatten the Upstream Slope and Armor with New Concrete Slabs. <br />6B) Flatten the Upstream Slope and Armor with Riprap. <br /> <br />A short description of the major components for these alternatives is presented <br />in the following sections, along with a discussion of design, maintenance, and <br />institutional issues. <br /> <br />Option 1 - Do Nothing <br />Do not perform any repair work on the facing. No construction will be involved, <br />including no maintenance upkeep for the existing concrete facing. <br /> <br />24 <br />