C150263 Feasibility Study - Laserfiche WebLink

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Project Description and Alternatives The purpose of this project is to enhance the means for the ll&D Company to continue providing irrigation water to shareholders by enabling the delivery of greater amounts of water for storage in the reservoir over shorter periods of time thus taking best advantage of storage opportunities as the reservoir comes into priority. Five alternatives were considered: 1. The no-action alternative. 2. Reinstate the ravine as the inlet for the reservoir. 3. Abandon the old easement in favor of an easement that followed the path of the ravine which is a shorter path to the reservoir by nearly half. 4. Replace the existing pipe with a larger pipe ($197,000). 5. Install a pipe parallel to the exiting pipe ($135,000). Alternative No. 1 was considered unacceptable since it means the LL&D Company could not reasonably be expected to store the amount of water needed to be able to deliver water to its shareholders given the restrictive rate of the existing inlet and the relatively short window in which the reservoir is typically in priority during the year. Alternative No. 2 was ruled out because of the potential for continued and exorbitant expenses related to cleaning up the trash and suspected hazardous materials that have accumulated in the ravine over decades of unrestricted and unsanctioned dumping into the ravine. Alternative No. 3 was ruled out due to the resistance of the property owner to allow the location of the right of way to be moved. Alternative No. ., was ruled out due to the expense of removing the existing structures on top of the expense of installing the new ones. See Appendix H. Alternative No. 5 was selected since it was the least expensive option that was acceptable to the property owner. The estimated cost of $135,000 is based on the estimate of the contractor (see Table 1 on the next page), plus estimated engineering costs at $15,000 (which has mostly been paid already), plus completion of repair of the lake outlet estimated at $5,000, plus $10,000 in contingency. See Appendix J. The selected alternative, Alternative No.5, involves installation of a larger, 30 inch pipe in parallel to the existing pipe along with the supporting gate structure and flume. Concrete pipe appropriately bedded in pea gravel will be used. loonan & Associates, Inc. has prepared engineering designs and cost estimates for the project. Conceptual plans as prepared by the loonan are attached to this study. (In electronic form, see documents "DETAl12-A1t2A layout1 (1).pdf', "DETAIL-A1t2A layout1 (1).pdf', and "STORM-Alt3a layout1 (1).pdf'.) Loveland Lake and Ditch Company Inlet Structure Upgrade Feasibility Study February 1,2008 10 of 47