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SUMMARY (Continued) cost-effectiveness of $450,000 per mg/L. The other concrete-lining altern- ative would have a total construction cost of $34,900,000 and a reduction of 5.2 mg/L in the salinity level at a cost effectiveness of $539,000 per mg/L. The pipe alternative would be the most costly at $62,800,000; however, it would result in the largest reduction in the salinity level, 6.7 mg/L, at a cost-effectiveness of $747,000 per mg/L. The following table summmarizes effects on the Colorado River, project features, and estimated costs for the most preferred plan. Combine and line EFFECTS ON THE COLORADO RIVER (average annual) Decrease in salt load (tons) Reduction in salininty at Imperial Dam (mg/L) 57,000 6.1 PROJECT FEATURES Pipe (miles) Canal and lateral lining (miles) ESTIMATED COSTS Canal and lateral lining Pipe Interest during construction Total Annual equivalent cost for 50 years at 7-3/8 percent Cost per mg/L of salinity reduction at Imperial Dam 34 $34,100,000 1,300,000 35,400,000 2,687,000 450,000 A fish and wildlife coordination report is being prepared. In addi- tion, a wildlife plan to compensate for the loss of wildlife habitat because of canal and lateral improvement is being developed. Following transmittal of the feasibility report to Congress, the unit could be authorized for construction and advance planning studies could be undertaken when funded. Costs and designs would be refined, and operation and maintenance contracts would then be negotiated and signed with the MVI. Assuming Congress authorized construction of the unit in fiscal year 1985, with the necessary appropriation of funds advance planning could begin in fiscal year 1986 and construction could begin in fiscal year 1990. Monitoring of system salt loads would continue throughout advance planning and during and after construction to determine effectiveness of the plan. ii 001419