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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 />6.0 ENGINEERING ASSESSMENTS AND REMEDIAl DESIGN <br /> <br />6.1 General <br /> <br />To meet the repair requirements as stated by the Colorado <br />Office of the State Engineer, the overall remediation program at <br />Gurley Reservoir must address rehabilitation of the outlet works and <br />restoration of the embankment and foundation integrity in areas <br />impacted by historical sinkhole activity. <br /> <br />Rehabilitation of the outlet works will impact more than just <br />the hydraulic operating efficiency of the facility as many of the <br />historical sinkholes appear to be at least partially a product of <br />seepage and infiltration into the outlet tunnel. The rehabilitation <br />and restoration techniques described in the following sections have <br />been selected to significantly reduce the potential for sinkhole <br />development in the portion of the foundation identified as being <br />most sinkhole susceptible. In addition, these remedial techniques <br />will improve the operating efficiency of the outlet works system <br />and should reduce operating and maintenance cost burdens. The <br />outlet works rehabilitation program will include relining the <br />existing outlet tunnel, replacing the existing intake structure and <br />air vent system, and installation of a new slide gate and control <br />system. <br /> <br />The embankment restoration program has been largely completed <br />already due to the apparent success of the sinkhole grouting <br />program completed during April 1987. No additional work is <br />therefore planned. <br /> <br />The foundation restoration program will include construction <br />of a grout curtain in the foundation to reduce and divert <br />foundation seepage. <br /> <br />-20- <br />