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Colowyo Coal Company <br />2013 Annual Reclamation and Hydrology Report <br />Calcium <br />140.68 <br />24.77 <br />198 <br />208 <br />10 <br />12/28/89 <br />3/13/84 <br />Iron <br />0.65 <br />0.91 <br />8.81 <br />8.84 <br />0.03 <br />08/13/08 <br />02/01/88 <br />Magnesium <br />144.82 <br />29.68 <br />225.3 <br />226 <br />0.7 <br />12/04/89 <br />05/20/97 <br />Sodium <br />76.56 <br />31.21 <br />195.3 <br />215 <br />19.7 <br />08/02/12 <br />04/17/00 <br />Flow rate <br />4.03 <br />5.19 <br />46.94 <br />47 <br />0.06 <br />04/27/98 <br />12/06/99 <br />Evaluation of2013 data for LGSC <br />No results from 2013 sampling were minimum or maximum values for any parameters <br />listed above during the monitoring period. Trend line analysis determined no significant <br />correlations over time. Sodium levels will continue to be monitored for any long -term <br />shift in concentration level. <br />UWFGSC: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.45 <br />0.12 <br />0.5 <br />8.6 <br />8.1 <br />6/18/08 <br />11/2/09 <br />Lab Cond. <br />943.45 <br />216.94 <br />937 <br />1240 <br />303 <br />11/18/13 <br />4/15/08 <br />TDS <br />704.80 <br />128.52 <br />480 <br />900 <br />420 <br />11/18/13 <br />6/03/09 <br />Sulfate <br />221.42 <br />71.26 <br />260 <br />341 <br />81 <br />7/30/13 <br />6/03/09 <br />Calcium <br />97.77 <br />14.80 <br />58 <br />121 <br />63 <br />11/10/11 <br />5/12/08 <br />Iron <br />1.38 <br />2.00 <br />7.85 <br />7.9 <br />0.05 <br />3/17/09 <br />10/31/12 <br />Magnesium <br />77.55 <br />18.56 <br />68 <br />103 <br />35 <br />11/18/13 <br />5/12/08 <br />Sodium <br />10.12 <br />2.88 <br />13 <br />19 <br />6 <br />2/23/10 <br />6/18/08 <br />Flow rate <br />0.81 <br />1.18 <br />5.84 <br />5.86 <br />0.02 <br />5/12/08 <br />10/31/12 <br />Evaluation of 2013 data for UWFGSC <br />Maximum values for conductivity, TDS, Sulfate and Magnesium were recorded during <br />2013. Trend line analysis determined no significant correlations over time. Colowyo is <br />unaware of any change in management or additional disturbance up gradient of this <br />location. This location is up gradient of all mining activity and is not representative of <br />potential impacts from mining. <br />LTC: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.11 <br />0.28 <br />1.6 <br />8.6 <br />7 <br />02/25/91 <br />02/22/89 <br />Lab Cond. <br />1634.64 <br />486.38 <br />3410 <br />3610 <br />200 <br />11/10/11 <br />02/28/90 <br />IDS <br />1216.28 <br />461.76 <br />2766 <br />2910 <br />144 <br />11/10/11 <br />02/28/90 <br />Sulfate <br />563.11 <br />270.64 <br />1591 <br />1610 <br />19 <br />11 /10 /11 <br />02/28/90 <br />Calcium <br />94.36 <br />27.49 <br />133.2 <br />159 <br />25.8 <br />11/10/11 <br />02/05/01 <br />Iron <br />4.55 <br />17.82 <br />131.99 <br />132 <br />0.01 <br />02/28/90 <br />09/13/95 <br />Magnesium <br />119.93 <br />45.16 <br />230 <br />238 <br />8 <br />10/12/88 <br />02/28/90 <br />Sodium <br />116.64 <br />86.36 <br />477 <br />483 <br />6 <br />11 /10 /11 <br />02/28/90 <br />Flow rate <br />0.37 <br />0.82 <br />6.3 <br />6.3 <br />0 <br />04/29/86 <br />12/13/02 <br />Page 2 -4 <br />