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<br />. <br /> <br />fill materials will be keyedlbenched into the existing embankment fill materials, In addition, a seepage <br />drain will need to be constructed at the southern groin of the embankment in the south abutment prior to <br />piacing any fill materials, A spring (wet area) has been observed in this area by the State Engineer's office <br />during their periodic inspections, The State Engineer's office has requested that this seepage be directed <br />away from the embankment. <br /> <br />A new outlet/intake structure will be constructed/installed to the south of the embankment and to the west of <br />the existing spillway, The intake structure for the outlet will be constructed of a precast concrete inlet box, <br />A concrete manhole with a steel gate structure will be installed approximately 200 feet downstream of the <br />inlet. The outlet pipe installed between the intake structure and downstream of the manhole will consist of <br />12-inch diameter PVC pipe, The outlet pipe will daylight in the natural channel downstream of the <br />embankment approximately 300 feet northwest of the manhole, <br /> <br />. <br /> <br />Alternative No, 4 will include the above work, as well as include raising the embankment by an additional 2 <br />feet and modifYing the existing concrete spillway structure, The embankment configurations outlined in <br />Alternative No, 3 will allow the placement of the additional two feet of embankment fill upon the crest of <br />the embankment so that a final minimum crest width of 22 feet can be achieved, The modifications to the <br />spillway will include raising the flow line in the existing structure by approximately 5 feet and then raising <br />the side walls of the existing structure by approximately 1.5 to 2 feet. Grouting of the natural abutment <br />soils on the ends of the existing concrete structure will probably be required to prevent seepage around the <br />structure. <br /> <br />NWCC, Inc, (Northwest Colorado Consultants, Inc,) and Water Resource Consultants, LLC prepared the <br />plans and specifications for Alternative No, 3, which has been approved by the State Engineer's office, A <br />copy of these plans and specifications are shown in Appendix C. It should be noted that the plans and <br />specifications required for the modifications outlined in Alternative No, 4 have not yet been completed, A <br />copy of these plans and specifications will be submitted as soon as they are completed, The Geotechnical <br />Investigation completed by NWCC, Inc, is shown in Appendix D, <br /> <br />Cost Estimate <br /> <br />. <br /> <br />The estimated cost for completing Alternative No, 3 is $300,000 and the estimated cost for completing <br />Alternative No, 4 is $330,000, The cost breakdown is summarized in the following Table I, <br /> <br />. <br /> <br />Martin Cull Dam Rehabilitation Feasibility Study <br /> <br />May 2002 <br /> <br />Page 4 <br />