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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 />5. Remove and raise the walkway platform to place it above the expected flood <br />flows, thereby reducing trash collection on the structure. Modify existing <br />operators due to raising support platform. <br /> <br />6. Provide riprap erosion control protection at both abutments to reduce the <br />potential for removal of the abutment areas during a flood. <br /> <br />7. Construct a measuring flume and concrete training walls downstream of the <br />sand gate to allow measurement of flows passed through the gate. <br /> <br />Alternative No.2. The second alternative includes some repair and some replacement of <br />components of the structure. The existing base slab would be repaired. However, all other <br />existing components would be razed and removed. The following measures would be taken to <br />repair the structure: <br /> <br />1. Place a new concrete slab over the entire base slab. This would repair and <br />replace the portions of the base slab that are eroded, broken, and spalled. <br /> <br />2. Grout the voids beneath the base slab where the underseepage has eroded <br />material from the foundation. <br /> <br />3. Remove the existing piers, gates, and stoplogs and replace with a concrete <br />overflow control wall. <br /> <br />4. Place a new concrete erosion control apron and concrete stilling basin down- <br />stream of the structure. <br /> <br />5. Remove the existing sand gate and install a larger control gate on the left side <br />of the structure. <br /> <br />6. Remove the existing walkway platform and place a new platform in the area of <br />the control gate. At this location, place it above the expected flood flows to <br />reduce trash collection on the structure. <br /> <br />7. Install a cutoff wall to rock at the upstream face of the structure to control the <br />underseepage. <br /> <br />8. Provide riprap erosion control protection at both abutments to reduce the <br />potential for removal of the abutment areas during a flood. <br /> <br />9. Construct a measuring flume and concrete training walls downstream of the <br />new control gate to allow measurement of flows passed through the gate. <br /> <br />PAGEI1-Cbapta-V <br />