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" W --J "-l ~ The following units are presented here in detail to show specific features and associated costs that would be needed to convey water to a plant boundary: LaVerkin Springs Unit McElmo Creek Unit Big Sandy River Unit LaV~rkin Sprin9s Unit. - Nevada Power Company has proposed to con- struct a 500-MW coal-fired powerplant in Warner Valley near ! . St. ,George, Utah. Jhe p1 ant has not been approved for constructlon for ,environmental, economic, and institutional reasons. However, the proposal is presented here to illustrate the concepts involved. The wat~r supply presently proposed would be from the proposed Warner Vall~yReservoir and from a coal slurry line from Alton, Utah [22]. The water from LaVerkin Springs could be used for cooling. Water supply features would consist of spring water collection facHities, a softening plant to remove excess calcium carbonate that would precipitate into the conveyance system, and a 33-inch pipeline with pumping plant to convey the water to the powerplant site. The delivery rate would be about 11.5 ft3/s. In order to facilitate the use of the saline water at the powerplant, a saline water cooling tower would be installed instead of the conventional wet cooling tower presently proposed, the equalizing reservoir would be enlarged, and ~ brine disposal pond would be added. Removal of LaVerkin Springs flow from the river would further deplete the flow of the Virgin River. In order to prevent this from having an a9verse impact on the fishery, a mitigation plan would be needed, and one proposal would be as follows: During periOdS of time when the entire flow of the river is being diverted for irrigation, 8 ft3/s of the water needed by irriga- tjon at Hurricane~ Utah, would be allowed to flow down the river. IM exchange, 8 ftJ/s of water would be pumped from the proposed Warner Valley Reservoir and delivered to the Hurricane area, The proposed diversion line to Warner Valley Reservoir would need to be designed as a closed system to permit flow in both directions. Arrangements would have to be made with local water agencies for such use of Warner Valley Reservoir for storage, The costs of furnishing LaVerkinSprings water to the Warner Valley Poweriplant are shown in table 16. The incremental costs for features at t~e powerplant to convert the power company's plan to use saline water are not shown here but are covered in chapter VI on savings in joint use, V-9 1. ",