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<br />I <br />I <br /> <br />Waters <br /> <br />lJ S. Count. <br />(ppm) <br /> <br />Mexican Count. <br />(ppm) <br /> <br />I <br />I <br />I <br /> <br />a) <br />b) <br /> <br />Upstream of Morel os Dam <br />Arriving at Imperial Dam <br />Salinity Differential <br /> <br />764 <br />.62.5. <br />69 <br /> <br />846 <br />m <br />74 <br /> <br />The annual average salinities resulting from operations under Minute No. 242, since it became <br />effective on June 24, 1974, are tabulated as follows: <br /> <br />I <br />I <br /> <br /> ANNUAL AVERAGE SALINITY (U.s. COUNT) AS TOTAL DISSOLVED SOLIDS <br /> (PPM) DIFFERENTIAL <br />YEAR AT IMPERIAL DAM UPSTREAM OF MORELOS DAM (PPM) <br />1974 (Jun 25 - Dee 31) 832 972 140 <br />1975 829 964 135 <br />1976 823 955 132 <br />1977 820 943 123 <br />1978 - . . - . - - 812 . . . . - . " - . 928 - -116 <br />1979 809 739 -70 <br />1980 755 740 -15 <br />1981 806 924 118 <br />1982 825 933 108 <br />1983 733 742 9 <br />1984 670 676 6 <br />1985 607 639 32 <br />1986 579 600 21 <br />1987 610 656 46 <br />. -- - - - - - - . - - - - - - - - -- - - - - - - - . - '- - - - - - - - - - - . - . . _ .u <br />1988 655 733 78 <br />1989 682 800 118 <br />1990 721 846 125 <br />1991 751 858 107 <br />1992 781 898 117 <br />1993 767 613 -154 <br />1994 797 875 78 <br />1995 787 869 82 <br />1996 782 859 77 <br />1997 695 764 69 <br /> <br />I <br />I <br /> <br />I <br /> <br />I <br />_I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />* The difference in the U.S. and Mexican counts is a result of different methods of analysis and of computing the total <br />dissolved solids used by laboratories in each country. <br /> <br />2 <br />