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nu2LJ5~ 2 ) The average salinities of the waters of the Colorado River a) upstream of Morelos Dam; b) arriving at Imperial Dam; and c) the resulting salinity differential were as follows: . Total Dissolved Solids in ppm 1/ 1991 Waters U.S. Count Mexican Count a) Colorado River upstream of Morelos Dam b) Arriving at Imperial Dam 0) Salinity Differential 858 751 107 906 796 110 The Commission agreed by exchange of letters that the records show the differential during calendar year 1991 was in accord with above cited Point 1 of Minute No. 242. The results of operations under Minute No. 242 since it became effective on June 24, 1974, are tabulated as follows: Salinity in ppm (U.S. count) Year Imperial Dam Above Morelos Dam Differential 1974 (Jun 25 - Dec 31) 832 972 1.40 1975 829 964 1.35 1976 823 955 1.32 1977 820 943 1.23 1978 812 928 U6 . 1979 809 739 -70 1980 755 740 -15 1981 806 924 U8 1.982 825 933 108 1983 733 742 9 1984 670 676 6 1985 607 639 32 1986 579 600 21 1987 610 656 46 1988 655 733 78 1989 682 800 U8 1.990 721 846 125 1991 751 858 107 The results of operations under Minute No. 242 are shown graphical- ly on Exhibit 2, which also shows the salinity of the waters arriv- ing at Imperial Dam and of the waters made available to Mexico at the Northerly International Boundary since 1951, the first full year of deliveries to Mexico under the Water Treaty of 1944. 1/ The difference in u.s. count and Mexican count is due to the use of different methods of analyses and of computing the total dissolved solids, by each country's laboratory. .