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<br />e <br /> <br />2 <br /> <br />e <br /> <br />2) The average salinities of the waters of the Colorado River a) upstream of <br />Morelos Dam; b) arriving at Imperial Dam; and c) the resulting salinity <br />differential were as follows: <br /> <br />Waters <br /> <br />Total Dissolved Solids in ppm 1/ <br />1990 <br />U.S. Count ----Mexican Count <br /> <br />a) Colorado River upstream of More1os Darn <br />b) Arriving at Imperial Dam <br />c) Salinity Differential <br /> <br />846 <br />721 <br />125 <br /> <br />887 <br />770 <br />117 <br /> <br />The Commission agreed by exchange of letters that the records show that the <br />differential during calendar year 1990 was in accord with above cited Point 1 <br />of Minute No. 242. <br /> <br />The results of operations under Minute No. 242 since it became effective on <br />June 24, 1974, are tabulated as follows: <br /> <br />Year <br /> <br />1974 (June 25 to December 31) <br />1975 <br />1976 <br />1977 <br />1978 <br />1979 <br />1980 <br />1981 <br />1982 <br />1983 <br />1984 <br />1985 <br />1986 <br />1987 <br />1988 <br />1989 <br />1990 <br /> <br />Salinity in ppm (U.S. Count) <br />Imperial Dam Above Morelos Dam Differential <br /> <br />832 <br />829 <br />823 <br />820 <br />812 <br />809 <br />755 <br />806 <br />825 <br />733 <br />670 <br />607 <br />579 <br />610 <br />655 <br />682 <br />721 <br /> <br />972 <br />964 <br />955 <br />943 <br />928 <br />739 <br />740 <br />924 <br />933 <br />742 <br />676 <br />639 <br />600 <br />656 <br />733 <br />800 <br />846 <br /> <br />140 <br />135 <br />132 <br />123 <br />116 <br />-70 <br />-15 <br />118 <br />108 <br />9 <br />6 <br />32 <br />21 <br />46 <br />78 <br />118 <br />125 <br /> <br />The results of operations under Minute No. 242 are shown graphically on <br />Exhibit 2, which also shows the salinity of the waters arriving at Imperial <br />Dam and of the waters made available to Mexico at the Northerly International <br />Boundary since 1951, the first full year of deliveries to Mexico under the <br />Water Treaty of 1944. <br /> <br />1/ The difference 1n U.S. count and Mexican count are due to the use of <br />different methods of analyses and of computing the total dissolved solids, <br />by each country's laboratory. <br />