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Table 9 <br /> Comparison of October 1979 Water Quality to <br /> October 1985 Water Quality on Tuttle Draw, <br /> Upstream and Downstream from the <br /> .Nucla Mine, Montrose County, Colorado <br /> Site SW-N1 Site SW-N3 <br /> Parameter (Upstream) (Downstream) <br /> (mg/l )* 10/19/79 10/17/85 10/29/79 10/27/85 <br /> Acidity as CaCO3 -326 0.00 -291 0.00 <br /> Alkalinity as CaCO3 353 380 321 370 <br /> Aluminum, Total 0.2 0.34 0.3 0.18 <br /> Barium, Total 0.2 0.02 <br /> Boron, Total 0.179 0.463 0.295 0.451 <br /> Calcium 194 194 396 358 <br /> Chloride 24 23 13 16 <br /> Chromium, Total 0.02 0.04 <br /> Conductivity <br /> (umhos/cm @ 25°C) 1632 1670 2540 2600 <br /> Copper, Total 0.02 0.002 0.02 0.002 <br /> Flow (gpm) 210 194 1346 618 <br /> Fluoride 1.00 0.98 0.96 1.17 <br /> Hardness as CaCO3 960 969 1766 1674 <br /> Iron, Total 0.09 0.22 0.25 0.34 <br /> Magnesium 116 118 188 190 <br /> Manganese, Total 0. 10 0.36 0.37 0.76 <br /> Mercury, Total 0.02 0.002 0.02 0.002 <br /> Molybdenum, Total 0.2 0.05 0.2 0.05 <br /> Nickel , Total 0.02 0.02 <br /> NO3-N 0.03 0.05 0.09 0.23 <br /> Ortho Phosphate .01 .01 <br /> pH at 25' (Units) 8.3 8.0 7.8 7.7 <br /> pH, Field (Units) 7.0 8.25 6.7 7.8 <br /> Potassium 4.0 4.0 7.0 6.0 <br /> Silver, Total 0.004 0.009 <br /> 33 <br />