10825 Water Supply Alternative Summary Phase 2 Assessment January 2008 Draft

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7.0 PAIRED ALTERNATIVES NOT RECOMMENDED FOR FURTHER CONSIDERATION An application of the evaluation criteria to all of the alternatives that have been studied in detailed is presented in Table 4 at the end of this summary. Alternative cost estimates are summarized in Table 5. Please note that cost was not a determining factor in identifying those alternatives not recommended for further consideration. Economic assumptions associated with each of the individual facilities are described in the memo, Unit Cost Estimates 10825 Water Supply Alternatives, which is available on the project website. After significant detailed review and analysis, the following five alternatives are not recommended for further consideration, as illustrated on Table 4. • Ruedi Reservoir paired with Buzzard Creek Reservoir (C2) • Ruedi Reservoir paired with Williams Fork Reservoir (0) • Sulphur Gulch Reservoir paired with Williams Fork (C4) • Wolford Mnt. Reservoir Expansion & Pump paired with Ruedi Reservoir (C5) • Wolford Mnt. Reservoir Pump paired with Buzzard Creek Reservoir (C6) Each of these five alternatives is described in more detail in memoranda that are available on the project website. A brief description and evaluation of each of the alternatives not recommended for additional consideration is presented below. 7.1 RUEDI RESERVOIR PAIRED WITH BUZZARD CREEK RESERVOIR (Alternative C2) This alternative provides 5,412 acre -feet of water from Ruedi Reservoir with 5,412 acre -feet of water from Buzzard Creek Reservoir in each and every year. This alternative is not recommended for further consideration primarily due to the more significant wetland impacts of Buzzard Creek Reservoir when compared to other structural alternatives. This element would likely not be the Least Environmentally Damaging Practicable Alternative (LEDPA) when compared to other alternatives. 7.2 RUEDI RESERVOIR PAIRED WITH WILLIAMS FORK RESERVOIR (Alternative C3) This alternative would provide different amounts of water from Ruedi and Williams Fork Reservoirs from year to year, depending upon whether it was a drier than average or wetter than average year. In above average and wet years, 2,700 acre feet of water would be released from Williams Fork Reservoir and 8,125 acre feet of water would be released from Ruedi Reservoir. In dry and below average years, all 10825 Water would be supplied from Ruedi 10825 Water Supply Study Phase 2 Alternatives Assessment January 2008 Graft 13