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<br /> Cost to prepare pond bottom (grade site flat <br />W and smooth, remove 'rocks) <br />CJ1 $.75/sq. yd. x 309,760 . . . . . . . . $ 232,320 <br />f\,;, <br />CO Cost to purchase and install liner <br /> $2.00/sq. yd. x 309,760. . . . . . . $ 619,520 <br />(3) Management <br /> BLM engineering and design costs. . . . $ 215,000 <br /> Preparation of environmental statement. $ 500,000 <br /> BLM supervision of construction . . . $ 20,000 <br /> <br />b. Annual Recurring Costs (Operation and Maintenance) <br />Repair of pond dikes (including material). <br /> <br />Overhead and maintenance personnel costs <br /> <br />$ 5,000 <br />$ 8,000 <br /> <br />c. Cost-Effectiveness and Benefit Analysis <br />Total Annual Costs <br /> <br />$ 212,500 <br /> <br />Cost-Effectiveness: <br /> <br />$ 212,500 per year $ <br />0.24 m9/1 reduction = 885,417 per mg/l per year <br /> <br />Incremental Economic Benefits. . . . . . $ 425,000 per mg/l <br />per year <br /> <br />Total Annual Benefits: <br /> <br />$ 425,000 x 0.24 mg/l = $ 102,000 <br /> <br />This proposed project may be the most economical means of reducing salt <br />concentrations in Onion Creek, in comparison with other potentially more <br />expensive control practices such as deep well injection or reverse osmo- <br />sis desalting treatment units. <br /> <br />3. Flowing Well <br /> <br />An exploratory oil well was drilled along Bitter Creek, just east of Rock <br />Springs, Wyoming, in 1937. The well is located in the SW1/4SW1/4 of <br />section 18, T. 19 N., R. 103 W., 6th Principal Meridian. It was drilled <br />to a depth of 4,546 feet below ground surface. The hole was apparently <br />cased to a depth of 3,494 feet, with a smaller steel liner extended to the <br />4,546-foot level. The liner was perforated at several depths (see Figure <br />4), A saline water-bearing zone under artesian pressure is located in <br />the Sun dance Formation. The well originally discharged about 700 gpm, but <br />it was estimated to be releasing only 50 gpm in the summer of 1978 (see <br />Figure 5). In 1978 TDS concentration was measured at 9,600 mg/l. <br /> <br />26 <br /> <br />._J,__ <br />