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COAL <br />s, <br />COMPANY <br />��.¢o� <br />31X .pEOPLS•PRODOCT'0*'" �+ <br />supported Colowyo's approved Probable Hydrologic Consequences PAP <br />assertion of minimal impacts due to mining activities from the existing <br />operation. <br />Colowyo provides the Division with monitoring results for both surface and <br />shallow groundwater monitoring in the Annual Hydrology Repot (AHR). These <br />data sets include trending information incorporating all data collected since <br />the inception of monitoring activities. It is displayed in spreadsheets, <br />graphically, and is further summarized in the report text. The data provided in <br />the AHR for surface water monitoring indicates that specific parameters such <br />TDS is increasing up gradient (New Upper Good Springs Creek - NUGSC) of the <br />mine as well as down gradient (Lower Good Springs Creek -LGSC) of the mine <br />operation. Other parameters for LGSC are trending downward, down gradient <br />of the mine site. Conversely, up- gradient of mining, the same parameters are <br />trending upward. Please see data presented below for NUGSC and LGSC, <br />which summarize the comparison in data trends up and down gradient of the <br />mine. <br />New Upper Good Spring Creek - NUGSC (Up- Gradient): <br />Parameter <br />Mean <br />Std <br />dev <br />Range <br />Max. <br />Min. <br />Max at <br />Min at <br />Trend <br />Lab pH <br />8.13 <br />0.24 <br />1.1 <br />8.6 <br />7.5 <br />04127198 <br />10124102 <br />Increasing <br />Lab Cond. <br />1499.95 <br />279.97 <br />2842 <br />3600 <br />758 <br />03106198 <br />05127193 <br />Level <br />TDS <br />1135.87 <br />241.79 <br />1250 <br />1610 <br />360 <br />08106101 <br />05108102 <br />Increasing <br />Sulfate <br />504.67 <br />145.21 <br />760 <br />930 <br />170 <br />07108102 <br />05120197 <br />Decreasing <br />Calcium <br />126.54 <br />19.50 <br />165.6 <br />169 <br />3.4 <br />08102102 <br />06101193 <br />Increasing <br />Iron <br />0.78 <br />1.60 <br />8.53 <br />8.54 <br />0.01 <br />05117199 <br />02111102 <br />Decreasing <br />Magnesium <br />122.61 <br />29.63 <br />226.9 <br />228 <br />1.1 <br />08102102 <br />04127198 <br />Increasing <br />Sodium <br />47.34 <br />16.16 <br />121.1 <br />138 <br />16.9 <br />11110108 <br />04127198 <br />Increasing <br />Flow rate <br />3.00 <br />3.22 <br />19.8 <br />20 <br />0.2 <br />04127198 <br />03118196 <br />Increasing <br />A Western Fuels- Colorado, LLC mining property <br />