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Table 8 (Cont. ) <br /> Comparison of Upstream (Site SW-N1) and Downstream (Site SW-N3) <br /> Water Quality on Tuttle Draw During 1980-1981 and 1985-1986, <br /> Nucla Mine, Montrose County, Colorado <br /> Mean Value for June-September Mean Value for November-February <br /> 1980 1985 1980-1981 1985-1986 <br /> Parameters SW-N1 SW-N3 SW-N1 SW-N3 SW-N1 SW-N3 SW-N1 SW-N3 <br /> Selenium, Total (ug/1 ) 1.00 1.00 2.00 2.00 2.00 2.00 <br /> Silicon, Total (mg/1 ) 7.00 8.60 7.00 6.80 <br /> Sodium (mg/1 ) 42.00 44.75 32.00 39.00 70.00 73.33 68.00 69.00 <br /> SAR 0.68 0.54 0.56 0.47 0.94 0.73 0.87 0.64 <br /> Sulfate (mg/1 ) 479.00 1087.50 368.50 943.00 716.00 1466.33 883.00 1782.00 <br /> N Suspended Solids (mg/1 ) 4.25 7.00 55.00 21.00 19.50 21.25 7.00 9.50 <br /> Zinc, Total (mg/1 ) 0.02 0.02 0.02 0.21 0.01 0.02 <br /> Cation/Anion Balance 4.12 4.07 2.34 2.74 2.90 3.18 2.26 1.83 <br /> Total Dissolved Solids @ <br /> 180°C (mg/1 ) 936.00 1789.25 718.50 1445.00 1422.75 2697.75 1529.50 2721.00 <br /> Total Dissolved Solids, <br /> Calculated (mg/1 ) 966.02 1758.19 781.56 1598.09 1358.26 2400.56 1603.69 2820.20 <br /> . Indicates no data. <br />