C150154 Approval Letter - Laserfiche WebLink

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',- Pine River - Bayfield Ditch Company May 19-20 2003 Agenda Item 18c - . concerns. First, is the unknown condition of the existing siphon to allow the sleeving process to be successfully accomplished. Second, is the cost associated with the required excavation and unforeseen problems associated with this alternative which cannot be determined until actual construction begins. Third, designing the system to allow for the approximate 37 cfs could be difficult, especially if a section of smaller diameter pipe is required to by-pass some obstruction(s) in the existing siphon. One advantage to the slip lining would be to eliminate some of the unknown problems associated with excavation of boggy soils if the siphon is replaced. Alternative 3, Replacement of the siphon with a new 30" PVC pipe ($267,000) - Under this alternative, the existing siphon would be replaced by a new 30-inch PVC pipe, designed to carry 37 cfs. Selected Alternative 3, Replacement of the siphon with a new 30" PVC pipe, was chosen as the preferred alternative and the most reliable long-term solution. The new siphon will be capable of delivering 37 cfs to the PRBDC system. Replacement of the siphon will require excavation of a trench to a depth of approximately six feet. The trench will then be bedded with 6 inches of three- quarter inch minus washed granular material, and twenty-foot joints of a 30-inch diameter PVC pipe installed in the trench. The sides and top of the pipe would be covered with three-quarter inch washed granular material for six inches before backfilling with native material. Several trench location and alignment options will be further evaluated in the design process to address some concerns about boggy soils/saturated soils. The Durango Office of the Natural Resources Conservation Service (NRCS) is preparing engineering designs and cost estimates for the project. Total Project cost is estimated to be: 1. Construction Cost (inc!. contingency) $217,000 2. Engineering Fees 50.000 (NRCS in-kind) TOTAL $267,000 The implementation schedule calls for completion of financing arrangements and final engineering design in June-July 2003. Construction will take place in September to November 2003. It is anticipated that a Corps of Engineers 404 permit will be required for the creek crossing. This is in process and no permitting delays are anticipated. Right-of-way for the ditch is prescriptive, but the three affected property owners are cooperating with PRBDC and no right-of-way issues are expected. Financial Analvsis The total estimated cost of the project is $267,000, and PRBDC water is used exclusively for agricultural purposes. Staff is recommending a 30-year maximum amount of $200,000 (approximately 75% of estimated project cost) for 30 years at an interest rate of 2.75%. PRBDC has sufficient cash assets budgeted to cover its $17,000 share of the project. Alternative financing sources: The PRBDC investigated alternative financing sources. They have obtained an in-kind grant from the NRCS for engineering design and construction inspection. The PRBDC attempted to obtain other grants, but found the current economic situation had either eliminated or severely decreased available grant funding. Table 1 is a summary of the financial aspects of the project. A CWCB Small Project Loan of $200,000 would have an annual payment of $10,865 (including the 10% reserve requirement) at the loan terms of 2.75% for 30 years. This represents an annual loan cost of $1.22 per acre-foot, based on an average annual delivery of 8,866 acre-feet. The CWCB loan will be repaid from Page 3 of 6