Laserfiche WebLink
Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <br />Summary of the indicator parameters for each surface water site is provided in the <br />following tables. <br />NUGSC: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.17 <br />0.25 <br />1.1 <br />8.6 <br />7.5 <br />04/27/98 <br />10/24/02 <br />Lab Cond. <br />1498.01 <br />277.75 <br />2842 <br />3600 <br />758 <br />03/06/98 <br />05/27/93 <br />TDS <br />1132.65 <br />231.50 <br />1250 <br />1610 <br />360 <br />08/06/01 <br />05/08/02 <br />Sulfate <br />497.44 <br />142.64 <br />760 <br />930 <br />170 <br />07/08/02 <br />05/20/97 <br />Calcium <br />125.90 <br />18.84 <br />165.6 <br />169 <br />3.4 <br />08/02/02 <br />06/01/93 <br />Iron <br />0.77 <br />1.53 <br />8.53 <br />8.54 <br />0.01 <br />05/17/99 <br />02/11/02 <br />Magnesium <br />122.15 <br />29.02 <br />226.9 <br />228 <br />1.1 <br />08/02/02 <br />04/27/98 <br />Sodium <br />47.25 <br />15.48 <br />121.1 <br />138 <br />16.9 <br />11/10/08 <br />04/27/98 <br />Flow rate <br />2.96 <br />3.24 <br />19.94 <br />20 <br />0.06 <br />04/27/98 <br />07/30/13 <br />Evaluation of 2018 Data For NUGSC <br />No results from 2018 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. <br />LGSC: <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Lab pH <br />8.07 <br />0.26 <br />2.5 <br />8.6 <br />6.1 <br />08/19/91 <br />05/14/91 <br />Lab Cond. <br />1714.92 <br />323.49 <br />3139 <br />3300 <br />161 <br />08/21/18 <br />06/23/92 <br />TDS <br />1360.57 <br />342.86 <br />3420 <br />4050 <br />630 <br />11/08/00 <br />05/23/95 <br />Sulfate <br />648.20 <br />160.14 <br />815 <br />1050 <br />235 <br />08/21/18 <br />05/20/97 <br />Calcium <br />140.12 <br />24.33 <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 />04/08/15 <br />Magnesium <br />144.23 <br />29.43 <br />225.3 <br />226 <br />0.7 <br />12/04/89 <br />05/20/97 <br />Sodium <br />80.94 <br />38.09 <br />323.3 <br />343 <br />19.7 <br />08/21/18 <br />04/17/00 <br />Flow rate <br />4.04 <br />5.12 <br />46.94 <br />47 <br />0.06 <br />04/27/98 <br />12/06/99 <br />Evaluation of 2018 data for LGSC <br />Maximum values for Lab Conductivity, Sulfate, and Sodium were recorded during this <br />period. Trend line analysis determined no significant correlations over time. <br />Page 6 <br />