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Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <br />MC-04-0?- <br />Parameter <br />C-04-02 <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.13 <br />0.16 <br />0.80 <br />8.40 <br />7.60 <br />09/18/17 <br />11/05/14 <br />Lab Cond. <br />1311.75 <br />154.50 <br />844 <br />1490 <br />646 <br />08/27/14 <br />08/20/18 <br />TDS <br />879.06 <br />120.41 <br />630 <br />1010 <br />380 <br />11/01/12 <br />08/20/18 <br />Sulfate <br />265.78 <br />40.18 <br />210 <br />321 <br />111 <br />11/01/12 <br />08/20/18 <br />Calcium <br />126.59 <br />15.27 <br />67 <br />148 <br />81 <br />08/27/14 <br />11/27/18 <br />Iron <br />0.08 <br />0.14 <br />0.77 <br />0.82 <br />0.05 <br />03/14/12 <br />03/22/11 <br />Magnesium <br />79.38 <br />10.03 <br />42 <br />92 <br />50 <br />08/27/14 <br />11/27/18 <br />Sodium <br />59.38 <br />21.53 <br />114 <br />127 <br />13 <br />03/13/13 <br />11/27/18 <br />Elevation <br />11.27 <br />0.92 <br />4.52 <br />14.13 <br />9.61 <br />01/12/15 <br />05/24/17 <br />Evaluation of 2018 data for MC -04-02 Well <br />Minimum values for Lab Conductivity, TDS, Sulfate, Calcium, Magnesium, and Sodium <br />were recorded during 2018. Mining commenced on the Collom Pit in the fall of 2018; <br />therefore, not enough data has been acquired to provide any reasonable analysis of the <br />data acquired to date. <br />M.1 -95-0l <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.00 <br />0.19 <br />1.00 <br />8.30 <br />7.30 <br />11/27/18 <br />11/05/14 <br />Lab Cond. <br />1297.81 <br />81.94 <br />350 <br />1420 <br />1070 <br />08/27/14 <br />05/04/11 <br />TDS <br />850.00 <br />56.91 <br />220 <br />940 <br />720 <br />08/18/11 <br />09/18/17 <br />Sulfate <br />248.13 <br />16.51 <br />63 <br />277 <br />214 <br />08/18/11 <br />05/23/13 <br />Calcium <br />120.44 <br />4.32 <br />18 <br />131 <br />113 <br />05/19/14 <br />05/24/17 <br />Iron <br />0.07 <br />0.05 <br />0.25 <br />0.30 <br />0.05 <br />03/14/12 <br />03/22/11 <br />Magnesium <br />93.50 <br />4.20 <br />14 <br />101 <br />87 <br />05/19/14 <br />03/14/12 <br />Sodium <br />29.25 <br />1.87 <br />9 <br />32 <br />23 <br />08/18/11 <br />05/24/17 <br />Elevation <br />14.17 <br />3.28 <br />16.96 <br />24.29 <br />7.33 <br />11/08/11 <br />04/30/18 <br />Evaluation of 2018 data for MJ -95-01 Well <br />A minimum value for Well Elevation was recorded in 2018. A maximum value for Lab <br />pH was recorded in 2018. Mining commenced on the Collom Pit in the fall of 2018; <br />therefore, not enough data has been acquired to provide any reasonable analysis of the <br />data acquired to date. <br />Page 15 <br />