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l-" W CD 01 Overview The salinity control program in the Colorado River Basin was authorized by the Colorado River Basin Salinity Control Act of 1974 (Public Law 93-320), as amended by Public Law 98.569. As required by the Clean Water Act (Public Law 92-500), existing numeric salinity criteria and the plan for implementing the salinity control program must be reviewed every 3 years. The last review was documented in Report on the 1993 Review, Water Quality Standards for Salinity, Colorado River System, October 1993. The 8alinity control plan identified in that review satisfies salt load reduction objectives and program goals by maintaining average total dissolved solids (TDS) at Imperial Dam, below Parker Dam, and below Hoover Dam at or below 879,747, and 723 milligrams per liter (mg/L), respectively, while the Basin States continue to develop their compact-apportioned waters. The 1993 salinity control plan is the officially adopted plan. This 1993 joint evaluation report, prepared by the U.S. Department of the Interior and the U.S. Department of Agriculture (USDA), describes the salinity control plan identified in the 1993 review. This report also outlines the coordination efforts needed to effectively implement the 8alinity control program and describes major program activities through fiscal year 1993. Figure 1 8hows the locations of the Department ofthe Interior and Department of Agriculture salinity control units. Table 1 shows the salinity control plan. The salinity control plan will remove about 1.375 million tons of salt annually from the Colorado River SY8tem by the year 2015 at a remaining cost of approximately $480 million. As of January 1993, 261,700 tons of salt annually were being removed. Public Law 93-320 and its amendment require that a percentage of the Federal cost of the salinity control program be repaid from the Upper and Lower Basin water development funds with revenue generated from the sale of hydropower. Repayment analysi8 of the Lower Colorado River Basin Development (LCRBD) Fund prepared for this evaluation shows that sufficient funds are available to cover appropriate costs of the salinity control plan. The LCRBD Fund can repay its share of the C08ts with an inflation rate of 6.4 percent.