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<br />'. <br /> <br />. <br /> <br />Evan 0, Dildine, P.E., Technical <br />\~ater Qua 1 ity Contra 1 \ Commi ss ion <br />May 22, 1979 <br /> <br />Secretary <br /> <br />. <br /> <br />-2- <br /> <br />W <br />f-l. <br />"1 salinity levels is greater. The comparative levels of salinity con- <br />eo <br />centrations in major streams in Colorado are shown at the state line <br /> <br />points in Table I. <br /> <br />TABLE I <br />AVERAGE SALINITY (TDS) CONCENTRATION A~ <br />STATE LINES <br /> <br />Arkansas River <br />Rio Grande River <br />South Platte. River <br />North Platte River <br />Colorado River <br /> <br />*3861 mg/l <br />* 251 mg/l <br />*1458 mg/l <br />* 180 mg/l <br />** 619 mg/l II <br /> <br />*Oepartment of Llea lth 1968-1978 <br />**BLH 1960-1975 ,IJ <br /> <br />It should be noted that the average salinity concentration in the <br /> <br />Colorado River at the Utah state line is only slightly above the 500 mg/l <br /> <br />EPA recommended level of TDS for domestic water and the same number is <br /> <br />considered by some as the threshold number for irrigation water, These <br /> <br />so called threshold levels are probably over simplifications as there are <br /> <br /> <br />many cities using water with higher TDS for domestic purposes and ranchers <br /> <br />and farmers in the lO\^ler Arkansas Valley in Colorado are using .Iater for <br /> <br />irrigation with TDS in the 3000 mg/l range. vJhile the Environmental Pro- <br />tection Agency has determined that the sidinity pollution of the Colorado <br />River is a matter which must be addressed through the requirements of the <br />