2008-04-30_REPORT - C1981038 (5)

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Bowie Resources, LLC Bowie No. 1 Mine 2007 Annual Hydrology Report SM07 Monitoring Well SM-7 Depth - 55' Top of Pipe Elevation - 7800' Pipe 2.5' Above Ground Ground Water Initiated 8/22/1985 8/22/1985 Activated 10/1!1997 10/1/1997 Date 12/13/2007 6/19/2007 • C7 Summary Information Field Parameters Baseline Operation UNITS Min Ave Max Min Ave Max Static Water Level Feet 18.2 26.2 32.3 0.0 27.5 45.0 29.11 24.25 Water Elevation Feet 7767.7 7773.8 7781.8 7755.0 7772.5 7800.0 .7770.89 7775.75 Tem erature Celsius 6.0 9.2 15.8 6.4 8.1 10.3 7.1 8.8 Conductivity umhos/cm 180 267 510 180 260 580 200 190 pH su 6.8 7.6 8.5 6.8 7.4 7.8 7.8 7.6 Field Comments Lab Parameters UNITS Bicarbonate mg/L 102 165 680 64 126 198 100.71 104.33 Carbonate mg/L <MDL <MDL <MDL <MDL <MDL <MDL <MDL <MDL Chloride mg/L 2 5 13 <MDL 3.5 11 2.56 4.53 Conductivity umhos/cm 229 280 362 218 275 401 250.85 226 Hardness m /L 103 139 193 83 123 192 115.12 105.81 H su 6.5 7.2 8.0 6.5 7.2 8.3 8.34 7.36 ResidueFilterable-TDS mg/L 117 164 220 110 171 243 154 135 ResidueNonFilterable-TSS mg/L 8 257 846 <MDL 47 154 42 <MDL SAR 0.19 0.24 0.29 0.26 0.32 0.46 0.352 0.403 Sulfate mg/L <MDL 19 78 <MDL 14.9 30.0 6.17 2.88 Calcium Dissolved) mg/L 1.9 40.4 59.0 20.8 37.1 59.2 37 29.1 Magnesium (Dissolved) mg/L 6.0 7.9 11.0 5.5 7.4 11.1 5.52 8.05 Sodium (Dissolved) mg/L 6.0 6.8 8.3 6.2 8.1 10.5 8.69 9.54 TDS Ratio (grav./talc.) 0.95 1.07 1.19 0.85 1.11 1.58 0.96 0.85 Shallow monitoring wells SM-1 through SM-11 were constructed in 1985 in order to gather additional information on alluvial/colluvia/deyosits within the permit boundary. They are depicted on Map 4-1. Baseline Information for Point SM07 is derived from events beginning on 8/22/85 through 10/1/97. Point influenced by mining on 10/1/97. Figure No. 13