2008-06-27_REPORT - C1980007 (7)

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Well SOM-C-76 Water Minlity and Mold Paramaters • • • Mountain Coal West Elk Mine Monitoring Location: Well SOM-C-76 Baseline' 2007 Water Year Description Units Minimum Maximum Mean 4/29/2007 5/25/2007 8/23/2007 Q Field Parameters Water Level Depth feet 276.1 277.0 280.2 Electrical Conductivity µmhos/cm 1910 2500 2970 2600 2560 2510 H SU 5.2 8.2 9.3 7.94 7.77 7.68 Temperature OF 55.4 56.5 58.6 Temperature °C 13.0 13.6 14.8 Comment Laboratory Parameters 3 Name of Certified Lab ACZ Lab Reference # L64613-03 Sample Date 8/23/2007 Lab Test Date 8/27-9/3 Sampled B Alkalinity (Total CaCO3) 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 /I Bicarbonate m /I 41 1181 1894 Boron, dissolved m /I Cadmium, dissolved m /I 0.000 0.000 Calcium, dissolved m /I 2.0 2.3 Carbonate m /I P 30 186 Cation - Anion Balance % -0.45 3.0 Cations me /I 9. 30.53 31.50 Chloride m /I 4 17 Conductivity µmhos/cm 2300 2487 2650 2450 Copper, dissolved m /I Hardness m /I 6 15 43 Hydroxide m /I 0 0 0 Iron, dissolved m /I 0.00 0.13 1.00 0.96 Iron, total m /I 0.00 5.01 18.00 2.66 Lead, dissolved m /I 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 8.5 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 talc. 46.1 102.7 128.6 Sodium, dissolved m /I 658 700 756 Sulfate m /I 0 9 180 TDS Ratio talc. TDS Calc. m /I TDS m /I 1530 1642 2590 1500 TSS m /I 7 37 226 20 Zinc, dissolved mg/I 0.00 0.00 0.01 Baseline pre-2000 data, adapted from WWE (2001). Numerous suspect data in baseline summary 2 ACZ Labs, Steamboat Springs, Colorado 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). West Elk Mine G-16 2007 Annual Hydrology Report HydroGeo, Inc.