2010-06-30_REPORT - C1980007 (7)

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Deep Creek Spring # 2 Water Quality and Field Parameters u • • Mountain Coat West Elk Mine Monitoring Location : Deep Creek Spring #2 Baseline' 2009 Water Year Description Units Minimum Maximum Means 5/9/2009 6/4/2009 Q 4 8/9/2009 Field Parameters Flow m 0.19 0.29 0.24 0.36 0.38 0.26 Electrical Conductivity umhos/cm 396 453 433 340 377 411 H SU 7.97 8.19 8.09 8.20 8.18 8.29 Temperature °C 7.1 13.4 10.4 13.6 9.2 13.2 Comment Laboratory Parameters' Name of Certified Labe ACZ Lab Reference # L76236-11 Sample Date 6/4/2009 Lab Test Date 6/5-6/17 Sampled B PH Alkalinity Total CaC03 m /I 167 219 195 164 Aluminum, dissolved m /I -0.03 0.09 0.06 -0.03 U Anions me /I 3.8 4.8 4.3 3.8 Arsenic, dissolved m /I Arsenic, total m /I -0.0005 0.0012 0.0006 -0.0005 U Bicarbonate m /I 159 211 185 154 Boron, dissolved m /I 0.01 0.02 0.01 0.01 B Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m /I 41.6 47.8 44.2 36.6 Carbonate m /I 6 14 9 10 B Cation - Anion Balance % 0 4.9 1.8 0 Cations me /I 4.1 4.9 4.5 3.8 Chloride m /I 2 3 2 2 B Conductivity µmhos/cm 393 440, 422 340 . Copper, dissolved m /I -0.01 0.03 0.01 -0.01 U Hardness m /I 127 147 136 112 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved MOB 0.02 0.08 0.05 -0.02 U Iron, total m /I 1.07 9.71 3.70 0.89 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 5.7 6.7 6.3 5.1 Manganese, dissolved m /I -0.005 0.008 0.003 -0.005 U Manganese, total m /I 0.018 0.146 0.057 0.024 B Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U Molybdenum, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I -0.02 0.25 0.08 -0.02 U Nitrite as N), dissolved m /I H SU 8.4 8.5 8.4 8.5 H Phosphate m /I -0.03 0.18 0.05 -0.03 U Phosphorus Ortho , dissolved m /I -0.01 0.06 0.02 -0.01 U Potassium, dissolved m /I 0.9 1.4 1.2 1.0 B Selenium, total m /I -0.001 -0.001 -0.001 0.0002 B Sodium Absorption Ratio SAR talc. 1.37 1.63 1.49 1.46 Sodium, dissolved m /I 35.1 44.8 39.5 35.3 Sulfate m /I 20 20 20 24 TDS Ratio calc. 1.01 1.16 1.06 1.02 TDS Calc. m /I 209 257 234 206 TDS /1 m 230 260 247 210 TSS /I m 6 302 136 21 Zinc, dissolved mg/I -0.01 0.03 0.01 -0.01 U Baseline 2007 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. 4 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL. H - Holding time exceeded; pH is a field test with an immediate hold time. B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). 5 Average mean value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. E-35 West Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.