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'""'" c..<> en 00 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 1990 Review, Water Quality Standards for Salinity, Colorado River System, May 1990. The salinity control plan identified in that review satisfies salt load reduction objectives and program goals by maintaining average total dissolved solids (TDS) at Imperial Dam at or below 879 milligrams per liter (mgIL), while the Basin States continue to develop their compact-apportioned waters. The 1990 salinity control plan is the officially adopted plan. This 1991 joint evaluation report, prepared by the U.S. Department of the Interior and the U.S. Department of Agriculture, describes adjustments to the salinity control plan identified in the 1990 review. The adjustments consist of (1) removing Bureau of Land Management projects from the repayment analysis; (2) analyzing the transfer of $10 million from the Lower Colorado River Basin Development (LCRBD) Fund; (3) making various changes in costs; (4) modifying implementation schedules to reflect delays, etc., in projects such as G1enwood-Dotsero Springs Unit and Uinta Basin Stage 1; and (5) updating salt removal accomplishments through 1991. This report also outlines the coordination efforts needed to effectively implement the salinity control program and describes major program activities through fiscal year 1991. Figure 1 shows the locations of the Department of the Interior and Department of Agriculture salinity control units. Table 1 shows the salinity control plan. The salinity control plan will remove about 1.5 million tons of salt annually from the Colorado River system by the year 2010 at a remaining cost of approximately $604 million. Public Law 93-320 and its amendment require that a percentage of the Federal cost ofthe salinity control program be repaid from the Upper and Lower Basin water development funds with revenue generated from the sale of hydropower. Repayment analysis of the LCRBD Fund prepared for this evaluation shows that sufficient funds are available to cover all costs of the salinity control plan, The LCRBD Fund can repay its share of the costs with an inflation rate of 3.4 percent.