Laserfiche WebLink
Colowyo Coal Company <br />2017 Annual Reclamation and Hydrology Report <br />UCG: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.56 <br />0.10 <br />0.4 <br />8.7 <br />8.3 <br />08/01/12 <br />03/22/11 <br />Lab Cond. <br />700.30 <br />157.05 <br />676 <br />1140 <br />464 <br />03/18/11 <br />04/26/16 <br />TDS <br />479.63 <br />119.47 <br />530 <br />820 <br />290 <br />03/22/11 <br />05/19/14 <br />Sulfate <br />114.74 <br />67.66 <br />272 <br />273 <br />1 <br />03/22/11 <br />11/08/11 <br />Calcium <br />75.00 <br />16.15 <br />63 <br />118 <br />55 <br />03/22/11 <br />05/19/14 <br />Iron <br />1.50 <br />2.23 <br />8.95 <br />9.0 <br />0.05 <br />04/26/16 <br />08/18/11 <br />Magnesium <br />46.52 <br />15.02 <br />70 <br />97 <br />27 <br />03/22/11 <br />05/19/14 <br />Sodium <br />12.19 <br />2.77 <br />11 <br />18 <br />7 <br />07/31/13 <br />05/19/14 <br />Flow rate <br />0.27 <br />0.42 <br />1.44 <br />1.44 <br />0 <br />04/26/16 <br />03/13/13 <br />Evaluation of 2017 data. or UCG <br />No results from 2017 sampling were minimum or maximum values for any parameters <br />listed above during the monitoring period. Mining impacts associated with the Collom <br />expansion did not occur in 2017. <br />CJC: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.42 <br />0.08 <br />0.4 <br />8.6 <br />8.2 <br />08/18/11 <br />03/14/12 <br />Lab Cond. <br />2013.21 <br />278.53 <br />1460 <br />2380 <br />920 <br />11/26/16 <br />03/22/11 <br />TDS <br />1556.07 <br />215.74 <br />1150 <br />1820 <br />670 <br />08/01/12 <br />03/22/11 <br />Sulfate <br />638.43 <br />131.53 <br />680 <br />859 <br />179 <br />11/21/16 <br />03/22/11 <br />Calcium <br />141.32 <br />16.62 <br />76 <br />178 <br />102 <br />08/01/12 <br />03/22/11 <br />Iron <br />0.32 <br />0.36 <br />1.56 <br />1.61 <br />0.05 <br />03/22/11 <br />08/18/11 <br />Magnesium <br />159.50 <br />23.88 <br />130 <br />199 <br />69 <br />11/21/16 <br />03/22/11 <br />Sodium <br />135.82 <br />25.67 <br />140 <br />167 <br />27 <br />08/01/12 <br />03/22/11 <br />Flow rate <br />0.07 <br />0.06 <br />0.2 <br />0.22 <br />0.02 <br />05/15/12 <br />07/31/13 <br />Evaluation of 2017 data for CJC <br />No results from 2017 sampling were minimum or maximum values for any parameters <br />listed above during the monitoring period. Mining impacts associated with the Collom <br />expansion did not occur in 2017. <br />Page 8 <br />