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. . . 3 across the land boundary at San Luis and. in the limitrophe section below Morelos Dam were less than the annual volume of 140,000 acre-feet (172,789,000 cubic meters) referred to in Minute No. 242, because of the effects of pumping of groundwaters by the Yuma Mesa wells and by.Mexican wells near San Luis. Average salinities of the waters.delivered to Mexico on the land boundary at San Luis were: Caleodar Year Total Dissolved Solids (U.S. count) 1977 1510 ppm The salinities were in the same range as those of the waters customarily delivered on the land boundary, which averaged about 1540 ppm for the 10-year period 1963-1972. Progress on United States Measures Provided for in P.L. 93-320 The progress made on the permanent measures to be t~ken and the works to be constructed, operated, and maintained in the United States by the Secretary of the Interior, pursuant to Public Law 93-320, Title 1, to enable the United States to comply with the provisions of Minute.No. 242, is described in the Bureau of Reclamation's Status Report as of January 20, 197B, copy attached as Exhibit 3. This report shows that the desalting plant is scheduled to be in operation by December 1981. Progress on the.Bypass Drain Pursuant to Point 4 of Minute No. 242, providing for an extension of the concrete-lined Well ton-Mohawk Bypass Drain in M~xico at the expense of the United States, and pursuant to Minute No. 248, adopted by the Commission on June 10,-~975, Mexico completed the 35 miles of drain in its territory in March 1977. The Bureau of Reclamation completed the part of the bypass drain in the United States in June 1977. This extension was placed in operation on June 23, 1977, providing a drain of a capacity of 353 cubic. feet (10 cubic meters) per second. from the previous terminus of the Main Outlet Drain Extension at Morelos Dam to the Santa Clara Slough, on the Gulf of California, a distance of approximately 50 miles (81 kilometers). Groundwaters Point 5 of Minute No. 242 provides that: o~ending the conclusion by the Governments of the United States and Mexico of a comprehensive agreement on groundwater in border areas, each country shall limit pumping of groundwater in its territory within five miles (eight kilometers) of the Arizona-Sonora Boundary near San Luis to 160,000 acre-feet 097,358,000 cubic meters) annually."