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<br />, acceptable for agricultural purposes. It is anticipated that total TDS will be lowered <br />O{)242'7 <br />through project action. <br /> <br />Studies also show significant increases in dissolved uranium, lithium, iron, strontium, <br /> <br />and other trace elements in addition to selenium within this section of the Arkansas <br /> <br />River and in the ground water5. At times state and EPA standards for maximum <br /> <br />contamination levels are approached or occasionally exceeded. Irrigation induced <br /> <br />leaching of marine shale derived soils and evaporative concentration has been found <br /> <br />to significantly increase concentrations. Extensive irrigation and reuse of irrigation <br /> <br />return flows in this watershed elevate concentration levels downstream. In addition <br /> <br />them is a strong positive correlation exsits between sodium, magnesium, sulfate, and <br /> <br />chloride salts with selenium and nitrates as well as uranium and other trace elements <br /> <br />mentioned above. Changes in specific conductance serves as a useful measurement <br /> <br />to estimate changes in concentration of each6. Also, it has been found that there is a <br /> <br />directly proportional change in concentration of each with any change in deep <br /> <br />percolation. <br /> <br />Eight organochlorine pesticides were detected in bird liver samples, eggs, and in fish <br /> <br />from the reservoirs. All concentrations were well within the ranges of reported <br /> <br />background concentrations and were less than levels of biological concern. <br /> <br />, Uranium Waters oi Southeastem Colorado: A Function og Geology Climate, and Land Use by Robert A. <br />Zielinski and Sigrud A.sher-Bolinder. US Geological Survey, Denver, Colorado. <br />, Selenium in Agriculture and the Environment, Soil Science Society of America, Special Publication #23, <br />1990. <br /> <br />;l;lffi <br /> <br />I <br />