2010-06-30_REPORT - C1980007 (7)

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Well SOM 23-H-4 Water Quality and Field Parameters • Mountain Coal West Elk Mine Monitoring Location: Well SOM 23-H-4 Baseline' 2009 Water Year Description Units Minimum Maximum Mean a 518/2009 6/2/2009 8/10/2009 Q Field Parameters Water Level Depth feet 137.3 136.8 138.4 Electrical Conductivity mhos/cm 1855 1893 1847 H SU 8.07 8.08 8.16 Temperature Oc 9.1 9.4 8.4 Comment Laboratory Parameters 3 Name of Certified Lab z ACZ Lab Reference # L77413-07 Sample Date 8/10/2009 Lab Test Date 8/11-8/24 Sampled B Alkalinity (Total CaC03) mg/I 1030 1140 1073 1060 Aluminum, dissolved m /I Ammonia m /I -0.01 -0.01 -0.01 -0.01 U Anions me /I 21.2 21.8 21.5 21.4 Arsenic, dissolved m /I 0.001 0.003 0.002 0.0027 Arsenic, total m /I Bicarbonate m /I 1000 1090 1031 998 Boron, dissolved Mg/1 0.27 0.30 0.28 0.30 Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m g/1 4.6 5.3 4.8 4.5 Carbonate m /I 21 63 42 66 Cation - Anion Balance % -2.2 1.4 0.7 0.7 Cations me /I 20.3 22.0 21.2 21.7 Chloride m /I 6 7 6 6 Conductivity mhos/cm 1730 2000 1840 1840 Copper, dissolved m /I Hardness m /I 18 21 19 17 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I -0.02 0.75 0.28 0.15 Iron, total m /I 0.63 1.75 1.01 0.78 Lead, dissolved m /I 0.0003 0.0017 0.0010 0.0011 Magnesium, dissolved m /I 1.6 1.9 1.7 1.5 Manganese, dissolved m /I -0.005 0.061 0.044 0.134 Manganese, total m /I 0.051 0.070 0.060 0.218 Mercury, dissolved m /I -0.0002 0.0002 0.0001 -0.0002 U Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N dissoloved m /I -0.02 0.07 0.02 Nitrate/Nitrite as N m /1 -0.02 0.07 0.02 0.04 B Nitrite as N dissoloved m /I -0.02 -0.01 -0.01 Nitrogen, ammonia m /I 0.40 0.51 0.45 0.46 B H SU 8.4 8.5 8.5 8.5 H Phosphate m /I -0.03 0.21 0.13 -0.03 U Phosphorus Ortho , dissolved mg/1 -0.01 0.07 0.04 -0.01 U Potassium, dissolved m /I 2.1 3.5 2.6 2.2 Selenium, dissolved m /I -0.002 -0.001 -0.001 -0.0001 U Selenium, total m /I Sodium Absorption Ratio SAR talc. 46.3 48.7 47.5 50.90 Sodium, dissolved m /I 450 487 470 483 Sulfate m /I -10 20 8 -1 U TDS Ratio talc. 0.95 1.04 1.01 1.00 TDS CaIc. m /I 1110 1170 1143 1160 TDS m g/1 1110 1190 1146 1160 TSS m /I Turbidity NTU 26.1 Zinc, dissolved mg/I -0.01 0.03 0.01 0.03 B ' Baseline 2005 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. West Elk Mine G-13 2009 Annual Hydrology Report HydroGeo, Inc.