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.. n-'" 87 \Julio. 2. A mainstem dam and reservoir could be constructed at the Webster Hill site, located immediately downstream from Rifle, which could provide the 20,000 acre-feet releases in the required years and perhaps even result in a profit from generation of hydropower. This alternative has two apparently fatal flaws which make it unacceptable to the U.S. Fish and Wildlife Service and environmental interests: . It's a dam and reservoir and . It would inundate designated Critical Habitat for the Endangered Species of fish. Based on our four years of working on this project, and the results achieved during this four-year period, the Consultant Team believes that there is some version of the "Share the Pain" alternative coupled with some version of the Insurance Pool alternative that can meet the Fish and Wildlife Service's goal of releasing/bypassing 20,000 acre-feet on to the spring peak hydro graph in those years when the peak flow of the Colorado River at Palisade is between 12,900 cfs and 26,600 cfs without unacceptably: . Reducing existing projects' yields, Increasing existing projects' operations and maintenance costs, or Affecting existing projects' operational flexibility and/or reliability. . . Based on review of the comments, however, the Consultant Team believes that before the Executive Committee can effectively develop a recommendation from the CFOPS study, it will first have to seek agreement on several important concerns that surfaced in the comments. These concerns include: 10 Is making a CFOPS release voluntary or mandatory? If an agency has agreed to take part in the CFOPS effort and if an agency has responsibility for making some release/bypass from one of the agency's reservoirs, is this release/bypass voluntary or mandatory? 2. Are CFOPS releases/bypasses subordinate to CROS? Or, are CROS bypasses subordinate to CFOPS releases/bypasses? 3. Do the results of the numerous simulations produced with the original and modified StateMod and the five versions of the C1 Data Set provide adequate and sufficient basis for developing a workable CFOPS recommendation? The Study Team has concluded that the answer to this question is, "yes," but some additional Ground Rules may have to be developed, however. 4. The Consultant Team has concluded that the 1975-91 hydrologic study period provides adequate and sufficient basis for developing a workable CFOPS recommendation. Again, however, some additional Ground Rules may need to be developed. ~ P: \Data \GEN\CWCB\19665\Report Phase 2\ Technical Memorandum No. 12\ TechMemo12.2.28.03.doc 2