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w ~ "-l ~ Table 17. - Summary of costs for softening and delivering McElmo Creek Unit water to Four Corners Powerplant Item January 1981 cost Total investment $ 3,000,000 5,500,000 10,100,000 17,200,000 17,900,000 8,900,000 62,600,000 7,512,000 70,112,000 5,868,000 70,000 66,00D 100,000 $ 6,104,000 $ 1,017,000 Diversion Dam on McElmo Creek Pipeline to Navajo Draw (including delivery and earthwork) Regulation reservoir on Navajo Draw Pipeline to Four Corners Powerplant (including delivery and earthwork) Pumping plants Treatment facilities Total capital costs Interest during construction Annual equivalent costs (50-year) Reservoir, pipeline, and pumping plant operation, maintenance, and replacement Power for pumping plant Pretreatment operation, maintenance, and replacement (labor, chemicals, power) Total annual costs Cost-effectiveness per mg/L Big Sandy River Unit. - At the present time, plan formulation activi- ties are just beglnning on the Big Sandy River Unit feasibility study. This appraisal-level alternative was prepared to illustrate the possible use of saline water from the Big Sandy River Unit, for cooling a coal-fired powerplant and a coal gasification plant [24]. The study is baseQ on using saline water in a cooling tower, The alternative would be single purpose and would consist of a pipeline from the Big Sandy River to a potential use site near Creston Junction, Wyoming, some 100 miles to the east, The potential users of saline water for this study are the Tri-State and Rocky Mountain Energy Companies, About 20 shallow (60 to 300 feet deep) wells would be pumped to provide a total of about 20 ft3/s of saline ground water from the seep area near the Big Sandy River. The water would be conveyed V-12