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M ~ C"'; -- ,- o ENVIRONMENTAL IMPACT STATEMENT SUMMARY Candidate plans After refinement. development is a brief conditions. selection, the candidate plans received further study and For comparison purposes, the future conditions without of a Dominguez Reservoir have been projected. The following description of the candidate plans and the future without Future Without Development The future without a development alternative is a forecast of the conditions expected to prevail if no Dominguez Reservoir Project is constructed and provides a basis for comparing and evaluating the poten- tial effects of the candidate plans with projected future conditions without such development. Nondevelopment assumes the Bureau of Reclama- tion would not be involved in dam or powerplant construction or new recreation, fish and wildlife, or cultural resource management. Demands on the resources of the project area would continue and development of the area would occur. Plan 3 Under this plan, designated the peaking power plan, a 302,000 acre- foot, 24-mile long Dominguez Reservoir would be formed behind Dominguez Dam, constructed on the Gunnison River about 11 miles southeast of Grand Junction. Dominguez Powe..plant, an 18 MW baseload plant would be con- structed at the base of the dam. A 500 MW pump back peaking power complex consisting of Rim Basin Reservoir and Rim Basin Pumping/Generating Plant would be constructed on the east canyon rim about 800 feet above Dominguez Reservoir and 9 miles upstream from Dominguez Dam. An annual average of 21,200 acre-feet of M&I water would be lifted by a pumping plant, housed within Dominguez Powerplant, through a 4.l-mile-long pipeline to a 43 acre-foot terminal storage reservoir for delivery to existing water distribution entities. Construction would necessitate relocation of 36 miles of the Denver and Rio Grande Railroad. Approxi- mately 25 miles of transmission lines would be built. Recreation facilities would be provided at two major sites and two smaller sites along Dominguez Reservoir and two sites along the Gunnison River downstream from Dominguez Dam. Fish and wildlife measures would include the acquisition and development of lands, construction of ponds and nesting structures along the river, zoning around the reservoir in specific seasons, and a multilevel outlet works at Dominguez Dam for adjustment of downstream water temperature. Cultural resource sites would be studied, mapped, and photographed, and artifacts would be collected from sites in danger of destruction by the project. Plan 7 Plan 7 is considered the alternative that could satisfy many of the designated project purposes with minimal environmental impacts and is named the environmental quality emphasis alternative. iii