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<br />. <br /> <br />. <br /> <br />CHAPTER IV <br /> <br />PROBLEMS AND NEEDS <br /> <br /> 1100 <br />...J 1000 <br />"- <br />'" <br />:::E <br />'" 900 <br />0 <br />...J <br />0 <br />'" 800 <br />0 <br />!oJ <br />> <br />...J <br />0 700 <br />'" <br />'" <br />0 <br />...J 600 <br />;: <br />0 <br />~ <br /> 500 <br /> 1940 1950 <br /> <br /> <br />".... <br />/' <br />/ <br />/' <br />/ <br />/ <br /> <br />~, <br />-'" <br /> <br />~~ <br /> <br />/ <br /> <br />Historical <br /> <br />_ _ _ Without Water Quality <br />Improvement Program <br /> <br />- _ _ _ _ With Water Quality <br />Improvement Program <br /> <br />1960 <br /> <br />1970 <br /> <br />1980 <br /> <br />1990 <br /> <br />2000 <br /> <br />2010 <br /> <br />In response to the Federal Water Pollution Control Act (Public Law <br /> <br />92-500), the Colorado River Basin States adopted salinity control <br /> <br />standards for the Colorado River. These standards, shown below for three <br /> <br />stations on the Lower Colorado River, have been approved by the <br /> <br />Environmental Protection Agency. <br /> <br />Station <br />Below Hoover Dam <br />Below Parker Dam <br />At Imperial Dam <br /> <br />Annual flow- <br />weighted average <br />723 mg /L <br />747 mg/L <br />879 mg/L <br /> <br />The CRWQIP goal is to maintain Lower Colorado River salinity levels <br /> <br />at or below these standards while the basin states continue to develop <br /> <br />their compact-apportioned waters. To attain this goal, an estimated <br /> <br />2.8 million tons of salt per year must be intercepted before entering <br /> <br />the river system by the year 2000. <br /> <br />001489 <br /> <br />15 <br />