2010-06-30_REPORT - C1980007 (7)

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Well SOM-C-76 Water Quality and Field Parameters is • Mountain Coal West Elk Mine Monitoring Location: Well SOM-C-76 Baseline' 2009 Water Year Description Units Minimum Maximum Mean 5 5/9/2009 5/25/2009 8/11/2009 Q Field Parameters Water Level Depth feet 303.2 303.7 306.5 Electrical Conductivity mhos/cm 1910 2500 2970 2490 2490 2520 H SU 5.2 8.2 9.3 8.07 8.07 8.18 Temperature °C 13.2 13.5 14.6 Comment Laboratory Parameters 3 Name of Certified Lab ACZ Lab Reference # L77515-04 Sample Date 8/11/2009 Lab Test Date 8/14-8/19 Sampled B PH Alkalinity (Total CaC03) mg/I 1294 1503 1860 Aluminum, dissolved m /I Ammonia m /I 0.00 0.64 1.36 Anions me /I 29.6 30.88 32.71 Arsenic, dissolved m /I 0.000 0.000 0.001 Arsenic, total m /l Bicarbonate m /I 41 1181 1894 Boron, dissolved Mg/1 Cadmium, dissolved m /I 0.000 0.000 0.000 Calcium, dissolved m /I 1.6 2.0 2.3 Carbonate m /I 0 30 186 Cation - Anion Balance % -3.3 -0.45 3.0 Cations me /I 29.30 30.53 31.50 Chloride m /I 0 4 17 Conductivity mhos/cm 2300 2487 2650 2290 Copper, dissolved m /I Hardness m /I 6 15 43 Hydroxide m /l 0 0 0 Iron, dissolved m /I 0.00 0.13 1.00 0.19 Iron, total m /I 0.00 5.01 18.00 2.23 Lead, dissolved m /l 0.00 0.00 0.00 Magnesium, dissolved m /I 0.6 0.8 1.5 Manganese, dissolved m /I 0.000 0.005 0.016 Manganese, total m /I 0.000 0.017 0.145 Mercury, dissolved m /I 0.0000 0.0000 0.0000 Molybdenum, dissolved m /I Nitrate/Nitrite as N m /I 0.00 0.16 2.16 Nitrogen, ammonia m /I 0.57 0.65 0.73 H lab SU 7.9 8.4 9.3 8.6 H Phosphate m /I 0.06 0.06 0.06 Phosphorus Ortho , dissolved m /I 0.000 0.068 1.26 Potassium, dissolved m /I 3.6 3.9 4.2 Selenium, dissolved m /I 0.000 0.000 0.000 Selenium, total m /I Sodium Absorption Ratio SAR calc. 46.1 102.7 128.6 Sodium, dissolved m /I 658 700 756 Sulfate m /l 0 9 180 TDS Ratio calc. TDS Calc. m /I TDS m /I 1530 1642 2590 1560 TSS m /I 7 37 226 19 B Zinc, dissolved mg/I 0.00 0.00 0.01 ' Baseline pre-2000 data, adapted from VWVE (2001). Numerous suspect data in baseline summary table. 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. 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). P Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. West Elk Mine G-16 2009 Annual Hydrology Report HydroGeo, Inc.