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I I I I I I I I I I I I I I I I I I I Alternative #3 This alternative would be to use pre-cast concrete box sections to build the new siphon. The box sections would be 12' x 12' square sections. Existing inlet and outlet concrete would be salvaged, with the overtopping levels of both ends of the siphon being raised in elevation. The cost of this option is approximately $513,000. A detailed cost estimate follows this discussion and a structure drawing is provided in Appendix C. Since the Technical Feasibility Study was completed, a large fault has been discovered in the concrete lining the Power Canal from the invert of the Stokes Gulch Siphon stretching upstream approximately 300'. Emergency repairs were made in order to keep water in the canal during the winter of 200512006, however, a permanent repair will now be added to the replacement project in order to stop the leaking that is affecting the home immediately below this area. The cost of that repair is estimated at $85,700 and would be added to the $513,052, making a total project cost of$600,000. Alternative #4 The no action alternative was considered unacceptable since it means that the District, at some point in the near future, would be unable to serve water to its landowners. It also puts in jeopardy two houses and a state highway, when the siphon fails, as well as the peach, grape, alfalfa, apple and produce crops in the entire District service area. Not only would the crops be lost, but there is a very real possibility that all of the fruit trees would also be lost, depending upon the time of the season a failure might occur. Estimates of total economic damage to the Grand Valley's economy are in the $250 million range. Orchard Mesa Irrigation District Feasibility Study Stokes Gulch Siphon Page 8