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IV. PROJECT EVALUATION . The total investment cost of the feasibility plan is estimated at approximately $85 million (investigation, construction, and interest costs included), of which over half is devoted to evaporation pond costs (See Table 1). The total cost effectiveness. for the selected plan is $1,060,000 per mg/L per year as related to the effective salt reduction at Imperial Dam. While m~eting the Environmental Quality Objectives under the Principles and Standards, the relatively high unit cost is not acceptable. The WPRS four standard planning tests must all be positively met before an alternative can receive consideration and approval as a feasible plan. The selected alternative described earlier does not meet present criteria for cost effectiveness and efficiency. Detailed analyses of hydrologic, chemical, geological, social, environmental, and economic factors have been performed for this alternative. The following discussion briefly shows the tests the plan meets, and the efficiency test which the plan fails to meet and why additional alternatives are being investigated. A. Acceptability The plan has the support of local communities. The involvement of significant segments of the public in the planning process has assured that both legal and institutional constraints, as well as social concerns, have been accommodated. During October 1978, the Hurricane City Council annexed land to be utilized by the project. As a condition of annexation, the council placed a 5-year moratorium on development to allow the WPRS time to complete its planning functions and seek authorization. Deeded access was also required. Acceptability is also demonstrated by the willingness of local irrigators to commit their limited water resources to provide for the needs of the project. Throughout the planning process, local leaders and interested citizens have worked to modify community and county land use plans to accommodate the La Verkin Springs Unit, 0025:2 5 16