C150311 feas study - Laserfiche WebLink

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II I ' ' , ' � ' � Project Description and Alternatives The purpose of this project is to provide a means for the Grand River Ditch Company to continue providing irrigation water to shareholders while minimizing the occurrence of future failures of their diversion structure. Three alternatives were considered: 1. The no-action alternative. 2. Reconstruct the Rock work in river 3. Install Pipeline and Protective Rock in river Alternative No. 1 was considered unacceptable since it means the Grand River Ditch Company could not deliver water to its shareholders. Alternative No. 2 was ruled out because of the potential risk that rock work will fail in high water and will continue to seep causing ditch failure. Alternative No. 3 was selected, since it is considered to be the least costly reliable approach. The se/ected alternative, Alternative No. 3, involves purchase and installation of 1320 ft. of two (2) side-by-side plastic pipes up to 48 inch diameter. Pipe may be a size smaller after final engineering. This also includes needed concrete and other structural needs and rock riprap. The Garfield County Office of the Natural Resources Conservation Service (NRCS) is preparing engineering designs and cost estimates for the project. Conceptual plans as prepared by the NRCS are attached in the back pocket of this study. ' The estimated cost of the completed project is $538,000. The cost breakdown is summarized in Table 1. The NRCS Preliminary Design report and detailed cost estimate are included in Appendix D. I' I' I � I, ❑ ' � ' Table 1. Grand River Ditch Company — Irrigation Pipeline Project - Cost Estimate Estimated Budget: Mobilization Earthwork to banks Concrete Headwall 10 CY Pipeline 1320 ft using 2 48 in. pipes Install Pipe Rock Rip Rap 15% engineering and contingencies permits $5,000.00 $20,000.00 $15,000.00 $240,000.00 $95,000.00 $75,000.00 $68,000.00 Total $538,000.00 I '