2008-06-27_REPORT - C1980007 (7)

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Well SOM 23-H-2 Water Qualitv and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location: SOM 23-H-2 Baseline 2007 Water Year Description Units Minimum Maximum Mean 4/27/2007 5/25/2007 8/23/2007 Q Field Parameters Water Level Depth feet 359.0 360.0 359.3 357.5 357.2 357.1 Electrical Conductivity µmhos/cm 1850 2300 2070 1697 1630 1629 pH SU 7.68 8.01 7.85 7.87 7.52 7.53 Temperature °C 13.2 13.8 14.0 Temperature of 39.1 58.3 52.5 55.8 56.8 57.2 Comment Laboratory Parameters 3 Name of Certified Labs ACZ Lab Reference # L64613-06 Sample Date 8/23/2007 Lab Test Date 8/24-9/13 Sampled B Alkalinity (Total CaCC3) mg/I 924 2560 1206 931 Aluminum, dissolved m /I Ammonia m /I -0.01 0.01 0.01 -0.01 U Anions me /I 18.8 23.5 19.8 18.8 Arsenic, dissolved m /I -0.001 -0.001 -0.001 -0.0005 U Arsenic, total m /I Bicarbonate m /I 908 2440 1149 895 Boron, dissolved m /I 0.71 1.52 1.34 1.72 Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m /I 4.1 12.5 10.7 14.1 Carbonate m /I -2 146 57 36 Cation - Anion Balance % -0.8 2.7 1.5 1.6 Cations me /1 18.9 24.8 20.4 19.4 Chloride m /I 5 6 6 6 Conductivity µmhos/cm 1550 1910 1678 1620 Copper, dissolved m /I Hardness m /I 18 58 49 60 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /l 0.38 17.50 4.64 0.78 Iron, total 6 m /I 6.74 89Q`tZ35 tfi145'f':":: 114 Lead, dissolved m /I -0.0001 0.0044 0.0014 0.0003 B Magnesium, dissolved m /I 1.8 6.5 5.5 6.0 Manganese, dissolved m q/1 0.025 0.068 0.044 0.044 Manganese, total m /I 0.055 11.6 2.081 0.204 Mercury, dissolved m /I -0.0002 -0.0002 -0.0002 -0.0002 U Mercury, total m /I Molybdenum, dissolved m g/1 Nitrate as N dissolved m /I -0.02 0.22 0.04 -0.02 U Nitrate/Nitrite as N m /I -0.02 0.23 0.05 0.02 B Nitrite as N dissoloved m q/1 -0.01 0.01 0.01 0.01 B Nitrogen, ammonia m /I 0.78 15.10 2.98 0.75 H SU 8.3 8.8 8.5 8.4 H Phosphate m /I -0.03 0.15 0.06 0.09 B Phosphorus Ortho , dissolved m /I -0.01 0.05 0.02 0.03 B Potassium, dissolved m /I 2.9 3.7 3.3 3.2 Selenium, dissolved m /I -0.001 0.001 -0.001 -0.0001 U Selenium, total m /l Sodium Absorption Ratio SAR calc. 23.5 57.8 29.7 23.30 Sodium, dissolved m /I 396 552 426 409 Sulfate m /l -10 20 7 -10 U TDS Ratio calc. 0.86 1.03 0.96 0.96 TDS Calc. m /I 996 1330 1071 1010 TDS m /I 970 1140 1018 970 TSS m /I Zinc, dissolved mg/I -0.01 0.02 0.01 0.01 B Baseline 2005 2 ACZ Labs, Steamboat Springs, Colorado 3 Negative values denote readings below lab detection levels "Average (mean) value calc using 1/2 of detection limit for readings below lab detection limit unless all readings are below detection limit 5 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 conadetected at a value bet method detection limit (MDL) and practical quantitation limit (POL). West Elk Mine G-21 2007 Annual Hydrology Report HydroGeo, Inc.