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. ~ o ....J c;t . . -4- The reduction in deliveries on the land boundary and in the limitrophe section below Morelos Dam in calendar year 1983 from the annual volume of 140,000 acre feet (172,689,000 cubic meters) referred to in Minute No. 242, was made up by waters delivered to Mexico in the bed of the river above Morelos Dam as is required by Point 1 of the Minute. The quantities of water delivered 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 (172,689,000 cubic meters) referred to in the Minute, because of the effects of pumping in prior years of groundwaters by the Yuma Mesa wells, the protective and regulatory pumping wells in the U.S. and by Mexican wells near San Luis. Average salinities of San Luis under Minute tabulated as follows: the waters delivered to Mexico on the land boundary at No. 242, since it became effective on June 24, 1974, are Year Total Dissolved Solids (U. S. Count) 1974 (June 25 to December 31) 1975 1976 1977 1978 1979 1980 1981 1982 1983 1515 ppm 1500 ppm 1480 ppm 1510 ppm 1470 ppm 1538 ppm 1582 ppm 1572 ppm 1470 ppm 1434 ppm The above data show that the salinity in 1983 was in the same range as that 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 Public Law 93-320 Construction of the Yuma Desalting Plant is scheduled for completion by 1989, according to the advice of the USBR. Groundwaters Point 5 of Minute No. 242 provides that: "Pending 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 (197,358,000 cubic meters) annually."