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1 Development Schedule Executive Summary The proposed schedule for implementation of the enlargement project includes a period of about 5 years, from 1995 through 1999, for detailed planning and design, and a period of about 3 years, from 2000 through 2002, for actual construction. Water deliveries could begin in 2003. The critical aspects of the planning phase, and of the project as a whole, are the development of consensus regarding water management strategies, the obtaining of certain agency permits, and the negotiation of cost-sharing and financing agreements. It is recommended that near-term efforts be directed at the development of a basin water management plan and the evaluation of critical permitting issues such as wetlands mitigation. I Cost Estimate The cost estimate for the enlargement project (including optional hydroelectric facilities) was developed from quantity takeoffs for the preliminary design and recent unit costs for construction items and contingency factors for construction-related items such as engineering and environmental mitigation. All costs were expressed in 1994 dollars. Table S-2 provides a breakdown of project costs by major category. Table S-2 Project Cost Estimate Construction Engineering $20,410,000 $4,085,000 Acquisitions/Relocations $3,100,000 EIS/Mitigation $3,065,000 Administrative $1,220,000 Financing $920,000- Other/Unlisted S 100.000 $32,900,000 ENVIRONMENTAL IMPACTS AND MITIGATION A Preliminary Environmental Assessment was prepared as part of the present study and is included as a chapter in this report. This assessment was carried out according to BLM and USBR guidelines. It relied heavily on existing information, although some reconnaissance- level field studies were carried out related to wetlands, riparian vegetation and habitat, and reservoir and stream fishery conditions. The principal on-site impacts of the project would be loss of wetlands and non-wetland habitat areas. It is estimated that approximately 75 acres of wetland will be lost, primarily in the area of the reservoir inlet and at the heads of tributary gulches. Roughly 600 acres of non- wedand habitat, mainly for deer, elk and sage grouse, would also be lost. This habitat is predominately sagebrush shrubland used as winter range. S-9