2008-06-27_REPORT - C1980007 (7)

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Well SOM 23-H-4 Wat- nuality and Paid Parameters • • Mountain Coal West Elk Mine Monitoring Location: Well SOM 23-H-4 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 136.2 136.2 136.9 Electrical Conductivity µmhos/cm 1936 1926 1967 1..1 SU 8.11 7.82 7.71 Temperature oC 9.7 10.0 10.6 Temperature of 49.5 50.0 51.1 Comment Laboratory Parameters 3 Name of Certified LaY Lab Reference # 07 Sample Date 07 p Lab Test Date 8/24-9/13 Sam led B Alkalinity (Total CaCO3) mg/1 1030 1140 1073 90 Aluminum, dissolved m /l Ammonia m /I -0.01 -0.01 0.01 -0.01 U Anions me /I 21.2 21.8 21.5 22.2 Arsenic, dissolved m /l 0.001 0.003 0.002 0.0008 B Arsenic, total m /l Bicarbonate m /l 1000 1090 1031 1040 Boron, dissolved m /1 0.27 0.30 0.28 0.33 Cadmium, dissolved m /l -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m /I 4.6 5.3 4.8 4.7 Carbonate m /l 21 63 42 51 Cation - Anion Balance % -2.2 1.4 0.7 2.4 Cations me /l 20.3 22.0 21.2 23.3 Chloride m /I 6 7 6 6 Conductivity µmhos/cm 1730 2000 1840 1910 Copper, dissolved / 1 Hardness 1 18 21 19 19 Hydroxide 1 -2 -2 -2 -2 U Iron, dissolved m 1 -0.02 0.75 0.28 0.34 Iron, total 1 0.63 1.75 1.01 2.00 Lead, dissolved mg / 11 0.0003 0.0017 0.0010 0.0025 Magnesium, dissolved m /I 1.6 1.9 1.7 1.7 Manganese, dissolved m /I -0.005 0.061 0.044 0.041 Manganese, total m /l 0.051 0.070 0.060 0.044 Mercury, dissolved m /l -0.0002 0.0002 0.0001 -0.0002 U Mercury, total m /I Molybdenum, dissolved m /l Nitrate as N dissoloved m q/1 -0.02 0.07 0.02 -0.02 U Nitrate/Nitrite as N m /I -0.02 0.07 0.02 -0.02 U Nitrite as N dissoloved m /l -0.02 -0.01 -0.01 -0.01 U Nitrogen, ammonia m /I 0.40 0.51 0.45 0.22 B H SU 8.4 8.5 8.5 8.4 H Phosphate m q/1 -0.03 0.21 0.13 0.21 Phosphorus Ortho , dissolved m /I -0.01 0.07 0.04 0.07 Potassium, dissolved m /l 2.1 3.5 2.6 2.3 Selenium, dissolved m /l -0.002 -0.001 -0.001 -0.0001 U Selenium, total m /I Sodium Absorption Ratio SAR calc. 46.3 48.7 47.5 52.80 Sodium, dissolved m /l 450 487 470 519 Sulfate -10 20 8 10 B TDS Ratio calc. 0.95 1.04 1.01 0.96 TDS Calc. t 1110 1170 1143 1220 TDS 1110 1190 1146 1170 TSS Zinc, dissolved mg/I -0.01 0.03 0.01 0.01 B 1 Baseline 2005 2 ACZ Labs, Steamboat Springs, Colorado 3 Negative values denote readings below lab detection levels 4Average (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 conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). West Elk Mine G-13 2007 Annual Hydrology Report HydroGeo, Inc. ii