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JaCl<:son lake Reservoir and imgatiw' November 22.23.1999. Agenda Item 13b. . (U003ted December 2.1999 and March 23. 2 Proiect Description Four alternatives were analyzed in the feasibility study: 1, The no-action alternative, ,2. Continue a level of minimum maintenance. 3, Rehabilitate'only the river diversion structure ($374,000). 4. Rehabilitate both the river diversion and headgate structures ($474,000). Alternative 4, rehabilitate both the river diversion and head gate structures, was ruled out because the headgate structure is in generally good condition and functioning satisfactorily.. Expenditure of the additional $100,000 could not be justified at this time, For this reason Alternative 3 was selected, since it is considered to be a reliable approach, and is less costly. The no-action and the minimum maintenance altematives were considered unacceptable since both would eventually result in partial or total failure of the diversion and inability of the JLRIC to deliver water. Selected Altemative 3 involves construction of a reinforced monolithic concrete floor for the new diversion structure, This concrete structure will be supported by pipe piling, and surrounded by sheet piling driven into the riverbed. All wing walls and support walls will be 15 inches thick, and steel reinforced. A 100-foot Obermeyer Pneumatic Spillway gate will be installed in the river diversion, (The project that the JLRIC plans to undertake is very similar to 2 recently completed projects, also funded in part by the CWCS. The South Platte Ditch Company and Weldon Valley Ditch Company rehabilitated their river diversions in 1996 and 1997 respectively. Soth projects included the use of Obermeyer Pneumatic gates, and both have operated well. The Sterling Irrigation Company also has CWCS loan approval and will complete a similar project in fall 1999,) The implementation schedule calls for completion of financing arrangements in 1999/2000, with formal approval and resolution by the JLRIC shareholders in early 2000. Engineering design will be finalized by July 2000, and construction is scheduled for completion in December 2000. Financial Analvsis The total estimated cost of the project is $374,000, Staff is recommending a loan of $336,600 (90 percent of the estimate cost.) CWCS policy allows for 90% loans to agricultural and municipal low income borrowers (policy set at the November 24-25, 1997 CWCS meeting,) Agriculture has not been a participant in the recent economic boom, The JLRIC will establish a one-time assessment to raise the remaining 10 percent of the project cost. That assessment will be $24.13 per share for 2000 only, Table 1 is a summary of the financial aspects of the project. Annual assessments will increase from $60 per share, to $73.28 per share with a Construction Fund loan of $336,600, This is an annual assessment increase of $13,28, or $0.61 per acre-foot, based on average annual diversions 34,000 acre-feet. 2