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Colowyo coal company <br />2010Annual Reclamation and HydrolgWReporr <br /> <br />Ote Id Lab <br />PH Lab <br />Conductivity <br />TDS <br />Sulfate <br />Calcium <br />Iron <br />Magnesium <br />Sodium <br />Elevation <br />(feet) <br />A-6 0.0967 0.0014 0.0291 0.0064 0.0001 0.0146 0.0021 0.0262 0.0038 <br />A-7 0.049 0.4469 0.3733 0.3342 0.3152 0.75 0.311 0.1515 0.3212 <br />A-8 0.0145 0.0032 0.0685 0.039 0.1535 0.0417 0.023 0.2327 0.2402 <br />NGSW 0.0009 0.0368 0.0916 0.0002 0.0283 0.2412 0.00005 0.1998 0.0022 <br />Gossard 0.0042 0.5668 0.8033 0.5768 0.417 0.0732 0.4439 0.0793 0.5012 <br />MT-95-02 0.0551 0.3636 0.1657 0.0975 0.0004 0.0068 0.0982 0.0171 0.2994 <br />Summary of the indicator parameters for each ground water site is provided in the <br />following tables. <br />A-6 Well: <br />0 <br />Parameter Mean Std dev Range Max. Min. Max at Min at Trend <br />Lab pH 7.63 0.34 1.9 8.6 6.7 11/30/93 11/21/02 Increasing <br />Lab Cond. 1109.04 80.19 510 1440 930 05/01/85 04/27/98 Static <br />TDS 695.91 94.95 750 930 180 07/17/01 03/13/93 Increasing <br />Sulfate 143.71 58.52 334.2 430 95.8 07/17/01 05/15/00 Static <br />Calcium 64.35 18.69 121.1 169 47.9 11/18/97 11/13/00 Static <br />Iron 0.34 0.44 1.81 1.82 0.01 09/26/98 11/18/97 Decreasing <br />Magnesium 55.30 18.22 127 169 42 11/18/97 08/19/82 Static <br />Sodium 120.33 20.04 124.1 142 17.9 3/11/08 04/27/98 Increasing <br />Elevation 6897.80 3.20 14.53 6902.53 6888 05/01/85 07/31/00 Static <br />A-7 Well: <br /> <br />Parameter Mean Std dev Range Max. Min. Max at Min at Trend <br />Lab pH 7.86 0.14 0.4 8 7.6 8/13/08 11/10/08 Increasing <br />Lab Cond. 1478.18 279.64 910 2260 1350 6/18/08 8/19/09 Decreasing <br />TDS 1160.91 317.32 1110 2100 990 6/18/08 8/19/09 Decreasing <br />Sulfate 445.45 222.02 744 1110 366 6/18/08 11/2/09 Decreasing <br />Calcium 126.0 20.14 70 186 116 6/18/08 8/19/09 Decreasing <br />Iron 0.05 0.00 0.00 0.05 0.05 6/18/08 6/18/08 Static <br />Magnesium 126.45 39.20 133 244 111 6/18/08 8/19/09 Decreasing <br />Sodium 47.82 10.46 40 77 37 6/18/08 8/19/09 Decreasing <br />Elevation 6889.93 2.72 8.88 6895.87 6886.99 6/18/08 11/2/09 Decreasing <br />Page 2-6