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Summary stockwater lines and to the Orangeville and Castle Dale water treatment plants. This line would replace use of the Mammoth Canal in winter to provide the raw water to the treatment plants. Environmental measures would include 330 acres of wetland replacement for off-farm losses and rehabilitation of 457 acres of upland habitat; onfarm replacement of wildlife losses would be on a voluntary basis, but $10.91 per acre-foot would be paid to the Endangered Species Recovery Implementation Plan for depletions from the Colorado River. The Utah Division of Wildlife Resources (UDWR) would administer the Reclamation-established wildlife habitat mitigation area. The United States would execute contracts with affected canal companies for the administration of project facilities. These canal companies would continue to operate and maintain their own distribution facilities, including the piped lateral systems and farm ponds. The companies would contract with the water users for the water sales and for operational arrangements affecting each water user. USDA will execute salinity control plans and long-time contracts with individual landowners to assure installation and maintenance of planned systems and efficient management of irrigation water. The construction cost of the preferred plan is estimated at $77,710,870, based on 1989 prices. This amount includes cost components of the onfarm and off- farm plan for Reclamation, the USDA, and individual farmers; it includes mitigation and habitat replacement costs to compensate for the loss of land and habitat for wildlife because of the project and for depletion of flows to the Colorado River by onfarm actions. A monitoring and evaluation plan for the Unit would be developed by both Reclamation and SCS in consultation with other agencies to measure salinity changes in the river system and in inflow and outflow from selected agricultural fields. Other monitoring would include wetlandlwildlife habitat quality and quantity, and economic impacts from individual USDA- administered salinity control plans. Cost allocation and repayment follow the mandates of Public Law 93-320, as amended by Public Law 98-569, by providing that 30 percent of the costs of operation, maintenance, and replacement (OM&R) and the off-farm portion, including wildlife mitigation, would be reimbursed as follows: . The Upper Colorado River Basin Fund's portion of construction and replacement would be repaid with interest within 50 years or less if the life of the facilities is shorter than 50 years. 00(429 S-7