2011-04-18_REPORT - C1996083 (5)

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s Bowie Resources, LLC Bowie No. 2 Mine 2010 Annual Hydrology Report SW-10 Terror Ditch Elevation - 6480 Surface Water Initiated 7/1/1983 7!1/1983 7!1!1983 7/1/1983 Activated Date 12/14/2010 9/28/2010 6/1712010 5/26/2010 Summary Information • • Baseline Operation UNITS Min Ave Max Min Ave Max Flow CFS 0.00 3.18 12.80 0.07 0.47 5.23 5.23 Water Level in Flume Feet 0.00 0.41 0.87 0.04 0.14 0.66 0.66 Temperature Celsius 0.1 9.5 21.3 1.2 1 9.1 10.6 10.4 Conductivity umhos/cm 20 138 970 190 190 100 70 pH su 5.6 8.2 9.2 8.5 8.5 8.5 7.8 Field Comments 1Remv recrdr Chng Chart , UNITS Bicarbonate mg/L 25.3 78.2 184.0 83.65 67.46 Chloride mg/L <MDL 3.1 21.8 6.81 11.79 Conductivity umhos/cm 53 162 310 220 234 215 Hardness m /L 32 62 129 57.01 36.27 Acidity mg/L 3.76 4.46 5.62 376 4 5.62 Nitrate-Nitrite mg/L <MDL 0.44 0.44 0.44 <MDL Oil and Grease mg/L <MDL <MDL <MDL <MDL <MDL pH su 6.9 7.7 8.3 7.65 8.1 7.2 Phosphate mg/L <MDL <MDL <MDL 0.06 <MDL ResidueFilterable-TDS mg/L 50 116 214 148 110 156 ResidueNonFilterable-TSS mg/L <MDL 27.1 136.0 12 14 16 SAR 0.20 0.53 1.47 0.557 0.531 Sulfate mg/L <MDL 11.98 54.00 9.06 20.58 Aluminum (Total) mg/L 0.376 0.383 0.389 0.376 0.389 Arsenic (Total) mg/L 0.010 0.013 0.015 0.01 0.015 Cadmium (Total) mg/L 0.004 0.007 0.010 0.01 0.004 Copper (Total) mg/L 0.01 0.01 0.01 0.01 0.01 Calcium (Total) mg/L 6.10 8.69 11.27 11.27 6.1 Iron (Dissolved) mg/L 0.02 0.03 0.05 0.02 0.03 0.05 Iron (Total) mg/L 0.11 0.12 0.13 0.11 0.13 0.11 Lead (Total) mg/L 0.01 0.04 0.06 0.06 0.01 Magnesium (Total) mg/L 5.10 6.06 7.01 7.01 5.1 Manganese (Total) mg/L 0.01 0.01 0.02 0.02 0.01 0.01 Mercury (Total) mg/L 0.00013 0.00017 0.00020 0.00013 0.0002 Molybdenum (Total) mg/L 0.0060 0.0060 0.0060 0.006 0.0060 Selenium (Total) mg/L <MDL 0.00018 0.00018 <MDL 0.00018 Sodium (Total) mg/L 7.47 8.64 9.81 9.81 7.47 Zinc (Total) mg/L 0.002 0.006 0.010 0.01 0.002 The area of concern for monitoring point SW-10 has not been affected by the mining operation. Therefore, all recorded monitoring events are considered Baseline. A stilling well and recorder were installed on a 30" Parshall flume on the Terror Ditch. This stream gauge is located in the NE114NE114, Sec 17, T13S, R9 Baseline Information Collection initiated on 7/1/83 and not yet considered complete. Point SWA 0 has not been influenced by mining. Figure No. 130