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1 <br />� Executive Summary <br />� <br />� <br />A presentation of a potential "Grand Valley Lake" (GVL) project was made to the Colorado Water <br />' Conservation Board (CWCB) in September 2007. Subsequent to that presentation, the Redlands Water <br />and Power Company (Redlands) and the Orchard Mesa Irrigation District (OMID) made a joint request <br />to the C WCB for a comprehensive study of the feasibility of the project. Project information, including <br />' letters of support for the study from the two study sponsors, was provided to the CWCB in a document <br />titled "Potential Grand Valley Lake Study" that was compiled by Donald E. Clay Professional Engineers <br />and Associates [Clay, 2007]. This supporting information is referred to below as the "Clay Report". It <br />� contains preliminary information for a new dam and reservoir south of the Colorado River, between the <br />towns of Grand Junction and Palisade, Colorado described as follows: <br />"This plan would divert about 300 cfs of water from the Gunnison River via 50 — 60 miles of <br />canal and tunnels. The aqueduct would provide an average annual water supply of 178,000 acre- <br />feet to the potential Grand Valley Lake (Reservoir) for use in the Grand Valley and surrounding <br />areas. The off stream lake would [have] a surface area of about 1,500 — 2,000 acres." <br />Information presented in the Clay Report at varying levels of detail includes: <br />• Preliminary Cost Estimates and Layouts <br />• Site Geology <br />• Hydrology <br />• Water <br />• Quality <br />• Water Rights <br />• Economics <br />This report examines two reservoir sizes (with corresponding variations in dam alignments) and three <br />conveyance alignments. Reservoir yield analyses were prepared for the two reservoir capacities. <br />Preliminary assessments of probable construction costs were prepared for each combination of <br />conveyance alternatives and dam alignments. The report concludes with a preliminary identification of <br />potential environmental issues. <br />Conveyance <br />As presented in the Clay Report, water supply for the Grand Valley Lake would be conveyed from a <br />gravity diversion on the main stem of the Gunnison River, downstream of the confluence with the North <br />Fork of the Gunnison. Both gravity-fed and pumped conveyance systems are presented below. Based <br />on the reservoir yield analysis presented in Section IV, two capacities; the 300 cfs capacity used in the <br />AECOM <br />2/22/10 <br />