2010-06-30_REPORT - C1980007 (7)

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Well 3-11-01 Water Quality and Field Parameters G-19 Mountain Coal West Elk Mine Monitoring Location Well 3-11-01 Baseline' 2009 Water Year Description Units Minimum Maximum Mean 5 5/6/2009 5124/2009 8/8/2009 Q 4 Field Parameters Water Level Depth feet 170.6 170.2 169.6 Electrical Conductivity µmhos/cm 3240 3220 3210 H SU 7.60 7.51 7.67 Temperature °C 14.1 14.0 15.4 Comment Baseline 10/03 to 9/04 .Laboratory Parameters Name of Certified Lab ACZ Lab Reference # L77413-04 Sample Date 8/812009 Lab Test Date 8/11-8/14 Sampled B PH Alkalinity (Total CaC03) mg/l 1620 1950 1802 Aluminum, dissolved m /I Ammonia m /I Anions me /I 35 36 35 Arsenic, dissolved m /I -0.0030 0.0010 -0.0007 Arsenic, total m /l Bicarbonate m /I 1620 1950 1802 Boron, dissolved m /I Cadmium, dissolved m /I -0.010 -0.005 -0.008 Calcium, dissolved m /I 5.3 12.5 8.1 Carbonate m /I -2 -2 -2 Cation - Anion Balance % -3.8 -2.5 -3.2 Cations me /1 33.0 33.4 33.2 Chloride M CI/[ 66 177 89 Conductivity µmhos/cm 2660 2730 2695 2950 Copper, dissolved m /I Hardness m /l 35 38 37 Hydroxide m /l -2 -2 -2 Iron, dissolved m /I 0.02 0.82 0.31 0.10 Iron, total m /I 0.30 0.49 0.40 1.00 Lead, dissolved m /I Magnesium, dissolved m /I 1.2 3.0 1.8 Manganese, dissolved m /I 0.03 0.14 0.07 Manganese, total m /l 0.14 0.15 0.15 Mercury, dissolved m /l -0.0002 0.0006 0.0002 Mercury, total m /l Molybdenum, dissolved m /I Nitrate as N m /I 0.03 0.21 0.10 Nitrate/Nitrite as N m /I -0.02 0.21 0.07 Nitrite as N m /I 0.06 0.06 0.06 Nitrogen, ammonia m /I 0.73 0.92 0.82 H lab SU 8.1 8.3 8.2 8.4 H Phosphate m /I -0.03 0.09 0.01 Phosphorus Ortho , dissolved m /I -0.01 0.03 -0.01 Potassium, dissolved m /I 4.0 4.1 4.1 Selenium, dissolved m /I -0.0050 0.0030 -0.0010 Selenium, total m /l Sodium Absorption Ratio SAR calc. 52.6 54.5 53.6 Sodium, dissolved m /I 723 1780 878 Sulfate m /I -10 40 1 TDS Ratio calc. TDS Calc. m /I TDS m /i 1850 2130 2044 1980 TSS m /I 16 B Zinc, dissolved mg/I -0.02 0.21 0.05 ' Baseline 2004 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). 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. West Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.