2011-04-18_REPORT - C1996083 (5)

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r Bowie Resources, LLC Bowie No. 2 Mine 2010 Annual Hydrology Report NFG-low North Fork - Drainage System Elevation - 6680 Surface Water Initiated 9/30/1996 9/30/1996 9/30/1996 9/30/1996 9/30/1996 Activated 3/31/1997 3/31/1997 3/3111997 3/31/1997 3/31/1997 Date 11/30/2010 9/7/2010 8/24/2010 6/15/2010 3/23/2010 Summarv Information • • Baseline Operation UNITS Min Ave Max Min Ave Max Flow CFS 99 292 610 53 468 2720 257 242 1040 86 FieldComment ICE ph su 8.1 8.4 8.7 7.6 8.3 8.8 8.5 8.8 8.3 8.2 8.0 Conductivity umhos/cmn 160 180 200 50 180 320 320 250 230 80 230 Tem eralure Celsius 4.0 8.5 14.6 0.3 11.4 22.3 0.4 18.3 21.1 15.1 4.6 DO mg/L 0.0 8.1 11.5 11.1 7.9 8.2 8 10.3 UNITS Bicarbonate mg/L 95 100 105 35 83 124 113.83 50 Chloride mg/L 2.00 2.50 3.00 <MDL 2.62 5.78 5.78 2.38 3.88 Chromium III Crlll mg/L <MDL <MDL <MDL <MDL Chromium VI CrIV mg/L <MDL <MDL <MDL <MDL Cyanide, Total mg/L <MDL <MDL <MDL <MDL Conductivity umhos/cm 201 222 242 93 200 382 382 254 136 Hardness mg/L 84 85 85 <MDL 80 150 98.54 113.33 28.84 Acidity mg/L 2 4 6 6 2 4 Nitrate mg/L <MDL 0.08 0.16 <MDL 0.42 3.90 <MDL Nitrate-Nitrite mg/L 0.00 0.08 0.16 <MDL <MDL <MDL <MDL <MDL Nitrite mg/L <MDL <MDL <MDL <MDL 0.002 0.010 <MDL Ammonia mg/L <MDL <MDL <MDL <MDL 0.05 0.31 <MDL Oil & Grease mg/L <MDL <MDL <MDL <MDL 4 5 <MDL <MDL pH su 8.0 8.0 8.0 7.0 7.9 8.8 7.89 8.25 8.09 7.67 Phosphate mg/L <MDL <MDL <MDL <MDL 0.02 0.10 <MDL 0.081 ResidueFilterable-TDS mg/L 130 140 150 50 146 370 370 200 140 123 ResidueNonFilterable-TSS mg/L <MDL 3 6 <MDL 23 141 50 52 27 SAR 0.55 0.61 0.66 <MDL 0.56 1.65 0.67 0.611 Sulfate mg/L 10.0 15.0 20.0 <MDL 17.5 31.3 25.11 27.57 15.23 Sulfide S mg/L <MDL 0.04 0.04 <MDL Aluminum mg/L 0.10 0.15 0.21 <MDL 0.33 1.32 0.018 1.038 Arsenic mg/L <MDL 0.001 0.001 <MDL 0.0021 0.0110 0.007 0.009 0.0028 Boron mg/L 0.02 0.49 1.35 0.87 Cadmium mg/L <MDL <MDL <MDL <MDL 0.0029 0.0180 0.01 0.001 0.002 Calcium mg/L 24.6 24.8 25.0 7.2 23.2 40.4 26.7 7.23 Copper mg/L <MDL <MDL <MDL <MDL 0.015 0.198 0.01 <MDL 0.002 Iron (Dissolved) mg/L <MDL <MDL <MDL <MDL 0.03 0.14 0.01 0.02 0.03 0.04 Iron (Total) mg/L 0.14 0.21 0.27 <MDL 0.30 1.48 0.14 0.2 0.11 0.5 Lead mg/L <MDL 0.010 0.020 <MDL 0.0142 0.1500 0.01 <MDL 0.02 Magnesium mg/L 530 5.50 5.70 2.00 5.44 12.68 7.74 2.62 Manganese (Dissolved) mg/L <MDL <MDL <MDL <MDL 0.198 2.900 0.05 0.026 Manganese (Total) mg/L 0.021 0.090 0.160 0.007 0.029 0.130 0.048 0.039 0.03 Mercury mg/L <MDL <MDL <MDL <MDL 0.00007 0.00030 0.00009 0.0003 0.00015 Molyebdenum mg/L <MDL <MDL <MDL <MDL 0.005 0.030 0.006 0.008 Nickel mg/L <MDL 0.010 0.010 <MDL Selenium mg/L <MDL <MDL <MDL <MDL 0.003 0.034 0.012 0.034 0.00073 Silver mg/L <MDL <MDL <MDL <MDL Sodium mg/L 11.5 12.2 12.9 3.0 13.5 33.8 15.5 7.7 Zinc mg/L 0.02 0.02 0.03 <MDL 0.01 0.04 0.002 <MDL 0.01 Field parameters, except flow, for the Lower North Fork of the Gunnison River are taken on the river approximately 1500' below the confluence of Terror Creek and the North Fork of the Gunnison. Flow data for the North Fork of the Gunnison river is obtained from USGS station #09132500. Baseline Information for Point NFG-low is derived from events beginning on 9/30/96 through 3/31/97. Point influenced by mining on 3/31197. Figure No. 118