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<br />EXHIBIT 2 <br /> <br />Historical Differentials in Salinity between <br />Imperial Dam and Northerly International Boundary <br />(flows in 1,000 acre-feet) <br /> <br />f09E <br /> <br />Year N. LB. Arri vi n9 at Differential <br /> Imperial Dam <br /> AF PPM AF PPM PPM <br />1964 1501. 7 1,382 5,903 819 563 <br />1965 1524.2 1,345 5,723 900 445 <br />1966 1420.4 1,248 5,849 889 359 <br />1967 1322.6 1,219 5,615 838 .--..-.--. 381 <br />1968 1326.6 1,189 5,738 842 347 <br />1969 1319.9 1,187 5,609 880 307 <br />1970 1312.7 1,140 5,692 897 243 <br />1971 1316.2 1,162 5,831 888 274 <br />1972 1325.0 1,104 5,800 866 238 <br />1973 1281. 1 979 5,856 843 136 <br />1974 1346.7 l! 966 6,218 835 131 <br />1975 1404.9 l! 964 6,192 829 135 <br />1976 1460.71! 955 5,905 823 132 <br />1977 1478.81! 943 5,705 820 123 <br />1978 Y 1458.0 l! 926 5,781 809 117 <br />II Including Tijuana del1very and Cooper Wasteway. <br />II Actual through September- October through December estimated. <br /> <br />Note: The salinity differential had no significant meaning prior to June 24, 1974, but is provided <br />for illustration. <br />