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Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Trend <br />Lab pH <br />7.76 <br />0.29 <br />1.7 <br />8.5 <br />6.8 <br />8/19/91 <br />10/03/00 <br />Level <br />Lab Cond. <br />1984.23 <br />270.99 <br />1550 <br />2700 <br />1150 <br />10/17/91 <br />04/27/98 <br />Increasing <br />TDS <br />1618.13 <br />251.60 <br />1320 <br />2100 <br />780 <br />8/13/08 <br />04/27/98 <br />Increasing <br />Sulfate <br />765.96 <br />171.03 <br />1192 <br />1340 <br />148 <br />3/17/09 <br />5/5/10 <br />Level <br />Calcium <br />168.91 <br />29.60 <br />169.3 <br />262 <br />92.7 <br />3/13/07 <br />10/8/98 <br />Increasing <br />Iron <br />0.08 <br />0.09 <br />0.45 <br />0.46 <br />0.01 <br />8/14/97 <br />10/1/01 <br />Decreasing <br />Magnesium <br />168.04 <br />30.35 <br />194 <br />270 <br />76 <br />03/13/07 <br />04/27/98 <br />Increasing <br />Sodium <br />91.36 <br />18.98 <br />140.3 <br />172 <br />31.7 <br />11/18/97 <br />04/27/98 <br />Increasing <br />Elevation <br />6535.26 <br />1.78 <br />10 <br />6540.65 <br />6530.65 <br />03/13/93 <br />05/19/99 <br />Decreasing <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Trend <br />Lab pH <br />7.92 <br />0.18 <br />0.6 <br />8.2 <br />7.6 <br />8/17/11 <br />11/10/08 <br />Increasing <br />Lab Cond. <br />1489.47 <br />231.72 <br />1100 <br />2260 <br />1160 <br />6/18/08 <br />05/05/10 <br />Decreasing <br />TDS <br />1186.32 <br />323.18 <br />1110 <br />2100 <br />990 <br />6/18/08 <br />8/19/09 <br />Decreasing <br />Sulfate <br />446.05 <br />183.23 <br />772 <br />1110 <br />338 <br />6/18/08 <br />05 /05/10 <br />Decreasing <br />Calcium <br />129.79 <br />25.83 <br />102 <br />214 <br />112 <br />05/03/11 <br />03/21/11 <br />Level <br />Iron <br />0.05 <br />0.01 <br />0.05 <br />0.1 <br />0.05 <br />08/17/11 <br />6/18/08 <br />Level <br />Magnesium <br />128.89 <br />37.14 <br />146 <br />244 <br />98 <br />06/18/08 <br />03/21/11 <br />Decreasing <br />Sodium <br />45.53 <br />8.81 <br />40 <br />77 <br />37 <br />06/18/08 <br />8/19/09 <br />Decreasing <br />Elevation <br />6889.21 <br />3.63 <br />14.63 <br />6899.68 <br />6886.99 <br />05/03/11 <br />10/31/12 <br />Decreasing <br />Parameter <br />Mean <br />Std dev Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Trend <br />Lab pH <br />7.95 <br />0.19 <br />0.6 <br />8.2 <br />7.6 <br />5/5/2010 <br />11/10/08 <br />Increasing <br />Lab Cond. <br />1106.00 <br />210.01 <br />683 <br />1570 <br />887 <br />11/2/09 <br />5/5/2010 <br />Level <br />TDS <br />837.65 <br />227.99 <br />740 <br />1360 <br />620 <br />3/21/11 <br />3/13/12 <br />Increasing <br />Sulfate <br />279.65 <br />143.56 <br />453 <br />626 <br />173 <br />3/21/11 <br />8/3/2010 <br />Increasing <br />Calcium <br />114.12 <br />24.44 <br />75 <br />165 <br />90 <br />11/2/09 <br />6/18/08 <br />Increasing <br />Iron <br />0.07 <br />0.08 <br />0.31 <br />0.36 <br />0.05 <br />11/10/08 <br />6/18/08 <br />Decreasing <br />Magnesium <br />89.65 <br />21.42 <br />64 <br />136 <br />72 <br />3/21/11 <br />3/13/12 <br />Increasing <br />Sodium <br />15.94 <br />4.42 <br />12 <br />23 <br />11 <br />2/23/10 <br />3/13/12 <br />Decreasing <br />Elevation <br />7107.12 <br />5.06 <br />16.72 <br />7116.93 <br />7100.54 <br />6/18/2008 <br />8/12/12 <br />Decreasing <br />Colowyo Coal Company <br />2012 Annual Reclamation and Hydrology Report <br />A -7 Well: <br />A -8 Well: <br />NGSW: <br />