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These alternatives assume that the construction of Quail Creek Dam and Reservoir by the WC~CD and State would enable Reclamation to eliminate some project structures and reduce costs. The Quail creek project would include a diversion dam located on the Virgin River about two miles upstream from Hurricane, Utah, and a pipeline to transport water from the Virgin River to the reservoir for storage (Figure 5). Diversion Facilities: If the Quail Creek Project were in operation, the La Verkin Springs Unit upper diversion structure and the 2500 foot long bypass pipeline could possibly be eliminated. In that event, Virgin River water would be diverted at the Quail Creek Project diversion dam through their (WCWCD) pipeline to the Quail Creek reservoir. ~ater would be returned to the Virgin River channel from the pipeline at a point just below La Verkin ~prings (the existing powerhouse) or from Quail Creek Reservoir. Total Evaporation Facilities: Saline spring water would be diverted for total evaporation as described previously under the total evaporation (Alternatives 4 and 5). Purgatory Flat Disposal Facilities: identical to those described for Alternatives these twu alternatives are identical with the used to line the evaporation ponds. The disposal facilities are 4 and 5. The facilities for exception of the material Alternative 6 - CPE Lining. The evaporation ponds would have a 40-mil CPE liner as described ~n Alternatives 2 and 4 and shown in Figure 3. Approximately 5,120,000 yd of liner would be needed. 2-foot Fi~ure Alternative 7 - Clay Lining. The evaporation thick claY,lining as.described3in Alternatives 3 4. ApproA1mately 4,2uO,OCD yd of clay would be ponds would have a and 5 and show~ in needed. ALTERNATIVES ELIMINATED Staged construction and lining the Virgin Gorge to prevent percolation of Virgin River water were considered but discarded as impractical. Staged construction was too costly and inefficient - phases were only 3-8 years apart. Lining the gorge to prevent 50 to 100 cfs from percolating into the 6Gulfer along a 6 mile sectlOG was considered too costly especially when edocG :0 the cost of the oth~r required fedtures. Coupling the sprin;s with the Aquatrain project was considered and discus,ed with the Saline Water Transport and Use office. The project office provided a verbGI ottern.inGtlol' that potential does not e)',ist at H,is time. CONSTRUCTION COST ESTIMATES Cost estimates were prepared for each of the seven alternatives. The cost for Alternative 1 (the original project presented in the 19B1 Concluding report) was indexed to July 1983 for comparison w1th the other six alternatives. Table 1 outlines the 1983 constructioll cost, the opel'at1on, 7 002610