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<br />intake structure would remain untouched. This alternative <br />would solve the problem associated with the loss of the sand <br />dam. Lowering the bladder gate during times of high river <br />flow will greatly reduce the possibility of having the sand <br />dam washed out. However, this will not correct the <br />deteriorated condition of the ditch intake structure. The <br />cost of this alternative is approximately $280,000. <br /> <br />. <br /> <br />4. Complete reconstruction of the river components, ditch <br />intake components and surrounding riverbank protection: <br /> <br />. <br /> <br />This alternative completes the provisions of alternative <br />number 3 and immediately addresses the problem with the <br />deteriorated ditch intake structure. The ditch components <br />are to be rebuilt in this alternative using radial gates <br />which are more protected during high water flows and largely <br />eliminate the strenuous work of placing and pulling boards <br />to adjust flows. This alternative allows for flood <br />protection, ease of operation and ready access to all <br />facilities during any normal flow characteristics. The cost <br />of this alternative is approximately $354,000. <br /> <br />The Se1ected Project <br /> <br />The SIC plans to construct alternative #4. Features of this <br />alternative are as follows: <br /> <br />. <br /> <br />Sheet piling and pipe piling will be used under all the <br />concrete structures for general stabilization and for <br />protection from undercurrents. Pipe piling will be placed in <br />an equal spaced pattern and the sheet piling will form the <br />perimeter of these structures. <br /> <br />Both the river and intake structures will have monolithic <br />steel reinforced concrete floors. These floors will be <br />approximately 15 inches thick. <br /> <br />Wing walls and support walls will all be steel reinforced <br />concrete with a minimum thickness of 15 inches. <br /> <br />. <br /> <br />The river structure will be 100 feet of Obermeyer Pneumatic <br />Spillway Gate or Bladder Gate. This gate will be 4.5 feet <br />high. The existing concrete diversion wall will be removed <br />for the 100 feet needed for the bladder gate but the <br />remaining section of wall will remain in place and will be <br />connected to the new floor and gate system. <br /> <br />FeaSibility Study <br />Sterling Irrigation Company Diversion Structure <br />August 1998 <br /> <br />7 <br /> <br />... <br />... <br />