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<br />and reflecting lower salinity levels at the measuring stations. This is <br />believed to be a temporary phenomenon and the projected levels through the <br />year 2010 (without water quality improvement projects) are expected to follow <br />the overall rising trend as shown in the graph. <br /> <br /> 1200 <br /> 1100 <br />~ <br />--' <br />... 1000 <br />~ <br />;:;: <br />IJ) <br />9 900 879 mg/L <br />--' <br />0 <br />IJ) <br />c 800 <br />lJJ <br />> <br />--' <br />0 700 <br />IJ) <br />IJ) <br />C <br />--' 600 <br />~ <br />0 <br />I- <br /> 500 <br /> 1940 1950 <br /> <br /> <br />- <br />./ <br />/ <br />/ <br />/ <br />/ <br />I <br />I <br />I <br /> <br />--- <br />- <br /> <br /> <br />Historical <br />, .v <br />__ _ Projected <br /> <br />1960 <br /> <br />1970 <br /> <br />:980 <br /> <br />1990 <br /> <br />20CO <br /> <br />2010 <br /> <br />.JJ Witho:Jt Water Quality Improvement Program <br /> <br />In response to the Federal Water Pollution Control Act (Public Law 92-500), <br />the Colorado River Basin states adopted salinity standards for the Colorado <br />River. These standards, shown below for three stations on the Lower Colorado <br />River, have been approved by the Environmental Protection Agency: <br /> <br />Station <br /> <br />Annual flow-weighted average <br /> <br />Below Hoover Dam <br />Below Parker Dam <br />At Imperial Dam <br /> <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 at or <br />below these standards, based on the 1972 levels, while the basin states <br />continue to develop compact-apportioned waters. To attain this goal, an <br />estimated 2.8 million tons of salt annually must be intercepted before <br />entering the river system by the year 2000. ";,' ~ ," <br /> <br />Palo Verde Irrigation District <br /> <br />The main source of water for the valley is the Colorado River, with some <br />underlying ground waters utilized by individual farmers for domestic needs, <br />for a portion of the agricultural development on the Palo Verde Mesa, and by <br /> <br />7 <br />