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<br />. <br /> <br />Station <br /> <br />. <br /> <br />Annual Flow-Weighted Average <br /> <br />Below Parker Dam <br /> <br />723 mg/L <br />747 mg/L <br />879 mg/L <br /> <br />Below Hoover Dam <br /> <br />At Imperial Dam <br /> <br />The CRWQIP goal is to maintain Lower Colorado River salinity levels <br /> <br /> <br />at or below these standards, based on the 1972 levels, while the basin <br /> <br /> <br />states continue to develop compact-apportioned waters. To attain this <br /> <br /> <br />goal, an estimated 2.8 million tons of salt annually must be intercepted <br /> <br /> <br />before 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 <br /> <br />some underlying ground waters utilized by individual farmers for <br /> <br />domestic needs, for a portion of the agricultural development on the <br />Palo Verde Mesa and by others for municipal and industrial purposes, <br />The mountain streams upstream from theirrigated lands oroduce high- <br /> <br />quality water with total dissolved solids ranging from 30 to 350 mg/L. <br /> <br />Water quality in the Colorado River Basin has deteriorated as riverflows <br /> <br /> <br />have been utilized for man's beneficial use and by return flows from <br /> <br />irrigated areas to the Colorado River and its tributaries, <br /> <br />Palo Verde Irrigation District Unit area, as a part of the CRWQIP, <br /> <br /> <br />contributes about 152,000 tons of salt annually to the Colorado River, <br /> <br />much of it from irrigated lands in the Palo Verde subarea of the District. <br /> <br />Irrigation return flows from this subarea contribute an estimated 144,000 <br /> <br />tons of salt annually to the Colorado River resulting in an {9(T~~.4J <br /> <br /> <br />about 18 mg/L at Imperial Dam. <br /> <br />10 <br />