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<br />RECORDED SALINITY LEVELS AT IMPERIAL DAM <br />WITH PROJECTIONS THROUGH THE YEAR 2010 <br /> <br /> 1200 <br />~ 1100 <br />..J <br />'- <br />(!) <br />::E <br /> 1000 <br />Ul <br />0 <br />..J <br />0 900 879 /l <br />Ul <br />0 <br />w <br />:3 800 <br />0 <br />Ul <br />Ul <br />0 700 <br />..J <br /><l: <br />I- <br />0 600 <br />I- <br /> 500 <br /> 1940 1950 1960 1970 <br /> <br /> <br />,..~ <br />/" <br />/ <br />I <br />I <br />/ <br />! <br />I <br />I <br /> <br />-- <br />--- <br /> <br /> <br />Historica I <br />Pl'Ojectedll <br /> <br /> <br />1980 <br /> <br />1990 <br /> <br />2000 <br /> <br />2010 <br /> <br />lJ Without Water Quality Impravement Program. <br /> <br />In response to the Federal Water Pollution Control Act Amendments of <br />1972 (Public Law 92-500), the Colorado River Basin States adopted salinity <br />control standards for the Colorado River. These standards, shown below <br />for three stations on the Lower Colorado River, have been approved by <br />the Environmental Protection Agency: <br /> <br />Station <br />Below Hoover Dam <br />Below Parker Dam <br />At Imperial Dam <br /> <br />Flow-weighted <br />average annual <br />concentration <br />(mg!L) <br />723 <br />747 <br />879 <br /> <br />The CRWQIP goal is to maintain Lower Colorado River salinity levels <br />at or below 1972 historical levels while the Basin States continue to <br />develop their compact-apportioned waters. To attain this goal, an esti- <br />mated 2.8 million tons of salt annually must be intercepted before <br />entering the .river system by the year 2000. <br /> <br />,",\ ~ ". ~ '"l ~ <br />VJL qL~ <br /> <br />11 <br />