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<br />B.259297 <br /> <br />W <br />CJl <br />CJ1 <br />0) <br /> <br />liter (mg/L), are 723 mg/L for below Hoover Dam; 747 mg/L for below <br />Parker Dam; and 879 mg/L for above Imperial Darn. <br /> <br />Since 1974, measurements of salinity at all three stations have been below <br />the established limits. As an example, figure 2 shows the salinity <br />measurements at the southernmost station (Imperial Dam), in relation to <br />the limit (879 mg/L), from 1974 through 1991 (the latest year for which <br />data were available). <br /> <br />Figure 2: Salinity Measurements Above Imperial Dam, 1974 Through 1991 <br /> <br />900 mglL <br /> <br />850 <br /> <br />800 <br /> <br /> <br />750 <br /> <br />700 <br /> <br />650 <br /> <br />600 <br /> <br />550 <br /> <br />500 <br />1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 <br /> <br />Year <br /> <br />- - - - ~ Numeric Criteria = 879 mglL <br /> <br />Source: GAD's representation of data presented in Quality of Water, Colorado River Basin, U.S. <br />Department of the Interior, Progress Rpt. No. 16 (Jan. 1993). <br /> <br />The dip in salinity shown in figure 2 is due primarily to the high-water <br />years experienced through the mid-1980s, according to Interior's report <br />cited above. The record-high flows during this period increased the <br />volume of water in the river, thus lessening the concentration of salt. The <br /> <br />Page 15 <br /> <br />GAOIRCED-95-58 Salinity Control Projects in the Colorado River Basin <br />