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Colowyo coal company <br />201~7Annual Reclamation and Hydrology Report <br />• <br />• <br />LTC: <br />Parameter Mean de Range Max. Min. Max at Min at Trend <br />Lab pH 8.09 0.27 1.6 8.6 7 02/25/91 02/22/89 Increasin <br />Lab Cond. 1592.35 438.92 3370 3570 200 03/06/98 02/28/90 Increasing <br />TDS 1127.76 355.76 1786 1930 144 10/05/89 02/28/90 Increasing <br />Sulfate 322.65 211.36 1109 1128 19 10/05/89 02/28/90 Increasing <br />Calcium 47.16 25.92 108.2 134 25.8 02/24/86 02/05/01 Decreasing <br />Iron 2.56 18.67 131.99 132 0.01 02/28/90 09/13/95 Increasing <br />Magnesium 58.09 45.65 230 238 8 10/12/88 02/28/90 Increasing <br />Sodium 46.42 36.07 168 174 6 10/05/89 02/28/90 Increasing <br />Flow rate 0.62 0.87 6.3 6.3 0 04/29/86 12/13/02 Decreasing <br />Colowyo currently samples each ground water site for a variety of quality parameters. <br />Of all the parameters that are analyzed for, several key indicator parameters are <br />identified. These are lab pH, lab conductivity, TDS, sulfate, calcium, iron, magnesium, <br />sodium and elevation. Statistical analysis is completed and illustrates historical trends <br />for each parameter in Exhibit 2B. <br />Ground Water Data -The R2 value for linear regression is indicated below. <br />Site Id Lab <br />H Lab <br />Conductivi TDS Sulfate Calcium Iron Magnesium Sodium Elevation <br />(feet) <br />A-6 0.0291 0.0136 0.0372 0.0065 0.0003 0.0044 0.0005 0.038 0.0004 <br />NGSW 0.008 0.001 0.0098 0.0398 0.0142 0.2275 0.00005 0.1656 0.0257 <br />Gossard 0.0325 0.6071 0.7787 0.6871 0.4263 0.0684 0.4564 0.0588 0.4773 <br />Summary of the indicator parameters for each ground water site is provided in the <br />following tables. <br />A-6 Well: <br />• <br />Parameter Mean Std dev Ran a Max. Min. Max at Min at Trend <br />Lab pH 7.58 0.3496 1.9 8.6 6.7 11/30/93 11/21/02 Increasing <br />Lab Cond. 1115.16 82.3983 510 1440 930 05/01/85 04/27/98 Increasing <br />TDS 694.43 102.8067 750 930 180 07/17/01 03/13/93 Increasing <br />Sulfate 149.21 61.7473 334.2 430 95.8 07/17/01 05/15/00 Increasing <br />Calcium 64.70 19.0804 121.1 169 47.9 11/18/97 11/13/00 Increasing <br />Page 2-4 <br />