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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 />8.14 <br />0.25 <br />1.1 <br />8.6 <br />7.5 <br />04/27/98 <br />10/24/02 <br />Increasing <br />Lab Cond. <br />1498.78 <br />278.17 <br />2842 <br />3600 <br />758 <br />03/06/98 <br />05/27/93 <br />Level <br />TDS <br />1137.04 <br />238.35 <br />1250 <br />1610 <br />360 <br />08/06/01 <br />05/08/02 <br />Increasing <br />Sulfate <br />503.55 <br />143.73 <br />760 <br />930 <br />170 <br />07/08/02 <br />05/20/97 <br />Decreasing <br />Calcium <br />126.57 <br />19.28 <br />165.6 <br />169 <br />3.4 <br />08/02/02 <br />06/01/93 <br />Increasing <br />Iron <br />0.77 <br />1.57 <br />8.53 <br />8.54 <br />0.01 <br />05/17/99 <br />02/11/02 <br />Decreasing <br />Magnesium <br />122.78 <br />29.49 <br />226.9 <br />228 <br />1.1 <br />08/02/02 <br />04/27/98 <br />Increasing <br />Sodium <br />47.35 <br />15.91 <br />121.1 <br />138 <br />16.9 <br />11/10/08 <br />04/27/98 <br />Increasing <br />Flow rate <br />2.99 <br />3.22 <br />19.84 <br />20 <br />0.16 <br />04/27/98 <br />08/02/12 <br />Increasing <br />Site Id <br />Lab <br />pH <br />Lab <br />Conductivity <br />TDS <br />Sulfate <br />Calcium <br />Iron <br />Magnesium <br />Sodium <br />Flow rate <br />(cfs) <br />NUGSC <br />0.0751 <br />0.0000005 <br />0.007 <br />0.0016 <br />0.007 <br />0.0041 <br />0.0011 <br />0.0409 <br />0.0071 <br />LGSC <br />0.0908 <br />0.0556 <br />0.0936 <br />0.0161 <br />0.0008 <br />0.0108 <br />0.0003 <br />0.1296 <br />0.0355 <br />UWFGSC <br />0.0117 <br />0.001 <br />0.0153 <br />0.0308 <br />0.0006 <br />0.0104 <br />0.0053 <br />0.0182 <br />0.0014 <br />LTC <br />0.0497 <br />0.1995 <br />0.2785 <br />0.1732 <br />0.0293 <br />0.0009 <br />0.032 <br />0.4527 <br />0.1259 <br />Colowyo Coal Company <br />2012 Annual Reclamation and Hydrology Report <br />Surface Water Data - The R value for linear regression is indicated below. <br />Summary of the indicator parameters for each surface water site is provided in the <br />following tables. <br />NUGSC: <br />