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Parameter <br />Mean <br />Std dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Trend <br />Lab pH <br />7.66 <br />0.35 <br />1.9 <br />8.6 <br />6.7 <br />11/30/93 <br />11/21/02 <br />Increasing <br />Lab Cond. <br />1113.67 <br />81.42 <br />512 <br />1440 <br />928 <br />05/01/85 <br />04/27/98 <br />Decreasing <br />TDS <br />694.91 <br />90.88 <br />750 <br />930 <br />180 <br />07/17/01 <br />03/13/93 <br />Increasing <br />Sulfate <br />141.67 <br />56.21 <br />334.2 <br />430 <br />95.8 <br />07/17/01 <br />05/15/00 <br />Decreasing <br />Calcium <br />63.77 <br />17.92 <br />121.1 <br />169 <br />47.9 <br />11/18/97 <br />11/13/00 <br />Decreasing <br />Iron <br />0.31 <br />0.43 <br />1.81 <br />1.82 <br />0.01 <br />09/26/98 <br />11/18/97 <br />Decreasing <br />Magnesium <br />55.22 <br />16.91 <br />128 <br />169 <br />41 <br />11/18/97 <br />03/21/11 <br />Decreasing <br />Sodium <br />121.89 <br />19.75 <br />128.1 <br />146 <br />17.9 <br />3/11/08 <br />04/27/98 <br />Increasing <br />Elevation <br />6898.02 <br />2.91 <br />14.53 <br />6902.53 <br />6888 <br />05/01/85 <br />07/31/00 <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 />Elevation <br />(feet) <br />A -6 <br />0.1752 <br />0.0083 <br />0.0167 <br />0.0158 <br />0.0036 <br />0.0384 <br />0.0099 <br />0.068 <br />0.0025 <br />A -7 <br />0.2751 <br />0.0645 <br />0.034 <br />0.0695 <br />0.003 <br />0.0296 <br />0.0263 <br />0.1223 <br />0.0906 <br />A -8 <br />0.1913 <br />0.0015 <br />0.0121 <br />0.0184 <br />0.0478 <br />0.0906 <br />0.0025 <br />0.0084 <br />0.0923 <br />NGSW <br />0.0644 <br />0.0751 <br />0.162 <br />0.002 <br />0.0688 <br />0.0938 <br />0.000005 <br />0.3469 <br />0.0022 <br />Gossard <br />0.0015 <br />0.5164 <br />0.7964 <br />0.5647 <br />0.4245 <br />0.0778 <br />0.4609 <br />0.1101 <br />0.5174 <br />MT -95 -02 <br />0.2655 <br />0.1125 <br />0.3327 <br />0.0562 <br />0.0991 <br />0.0033 <br />0.0487 <br />0.3407 <br />0.0192 <br />Colowyo Coal Company <br />2012 Annual Reclamation and Hydrology Report <br />Ground Water Data - The R value for linear regression is indicated below. <br />Summary of the indicator parameters for each ground water site is provided in the <br />following tables. <br />A -6 Well: <br />