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. . . 002295 approved by EPA The criteria, set in terms of milligrams per liter of IDS, are shown in the following tabulation. Location Below Hoover Dam Below Parker Darn Below Imoerial Dam Annual flow-weighted average TDS (maIL) 723 747 879 To meet these criteria, under future conditions, approximately 1.0 million tons of salt an!1ually will need to be removed from the river's waters. The overall strategy in meeting the standards is to prevent salt from entering and mixing with the river's flow. A number of agricultural, point, and diffuse sources of salinity have been identified throughout the Basin. The salinity control program will implement controls at those sites which contain salt sources that can be intercepted, reduced, and/or prevented from entering the river at least cost. In June 1974, Congress enacted the Colorado River Basin Salinity Control Act, Public Law 93-320, which directed the Secretary of the Interior to proceed with a program to enhance and protect the quality of water available in the United States and the Republic of Mexico. Title I of Public Law 93-320 enables the United States to comply with its obligations- under the agreement with Mexico dated August 30, 1973 (Minute No. 242 of the International Boundary and Water Commission, United States and Mexico), and concluded pursuant to the Treaty of February 3, 1944. Title II of Public Law 93-320 directed the Secretary of the Interior to expedite the completion of planning reports on 12 salinity control units and to proceed with construction of the Paradox Valley, Grand Valley, Crystal Geyser, and Las Vegas Wash Units. These four units are sometimes referred to as the Colorado River Basin Salinity Control Project. In October 1984, the President signed Public Law 98-569, the Colorado River Basin Salinity Control Amendment which amends Public Law 93-320. It directs the Secretary of Agriculture to establish a major voluntary on-farm cooperative salinity control program within the Department of Agriculture. Maximum Federal cost shares are not to exceed 70 percent unless higher levels are approved by the Secretary of Agriculture. The new authority also requires that 30 percent of the Federal cost shall be repaid from the Upper and Lower Basin water development funds with revenue generated from the sale of hydropower. 2