C150376 Approval Letter - Laserfiche WebLink

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Ish Reservoir Company October 18, 2013 (Updated October 21, 2013) Page 3 of 4 Alternatives considered were: Agenda Item 8g Alternative 1— Do Nothing: This alternative is considered unacceptable. Without the structures, the Company is unable to divert its water rights thereby leading to abandonment of the rights. Alternative 2 — Rebuilding Collaboratively with Improvements: The replacement will be built in collaboration with Boulder and Larimer County Irrigating and Manufacturing Company. Final design alternatives are being evaluated. Selected Alternative 3 — Repair of Both the Diversion Structure and Ish Reservoir Inlet: The scope of work for the diversion structure repairs involves removing debris from the dam and inlet structure, forming and pouring a new wing wall on the north side of the diversion dam, and then rechanneling the Little Thompson River to flow back over the diversion dam. The scope of work for inlet washout repairs involves creating a new path for the Company's ditch through this area. This will involve creating a permanent foundation secured to bedrock and building a new water conveyance system on top of this foundation. The decision on the type of conveyance system will be determined based on an engineering analysis. The options include an open ditch, a box culvert or pipe. The selection of the best option will be based on a feasibility study and economical analysis. Significant weight will be given to the option that is most likely to handle the next maj or flood event. Additionally, the headgates are full of silt and debris and the ditch below the diversion dam has 8 —10 feet of silt and debris that must be removed. The estimated engineering and construction cost of the Company's portion of the selected alternative is $205,000. (Note: The Boulder and Larimer County Irrigating and Manufacturing Company is also seeking an Emergency Loan from the CWCB to fund its portion of the project costs.) TABLE 2: PROJECT COST SUMMARY (COMPANY'S PORTION ONLY) Task Cost Design & Permitting $55,000 Construction $120,000 Silt and Debris Removal $30,000 Total $205,000 Note: Contingencies were built into each task's estimates Collaboration: The borrower is encouraged to consider rebuilding a river diversion system that enhances consumptive and nonconsumptive uses of water within the river corridor. Examples include improved fish passage, improved rafting/boating navigation, and possible shared ownership /use of a single diversion structure where possible. If needed, loan funds may be used for the construction of temporary diversion until such time that a multi - beneficial structure can be designed and constructed.