2010-06-30_REPORT - C1980007 (7)

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Spring J-7 Water Quality and Field Parameters 0 s Average (mean) value calc using 112 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. Mountain Coal West Elk Mine Monitoring Location : Spring J-7 Baseline' 2009 Water Year Description Units Minimum Maximum Mean a 5/9/2009 6/3/2009 Q 4 8/9/2009 Field Parameters Flow m 0.19 9.09 4.29 4.44 5.70 D Electrical Conductivity mhos/cm 242 496 376 332 362 H SU 6.55 8.25 7.60 7.91 8.32 Temperature °C 9.7 21.0 15.4 10.9 20.7 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L76196-04 Sample Date 6/3/2009 Lab Test Date 6/5-6/16 Sampled B PH Alkalinity (Total CaC03) mg/I 121 188 142 122 Aluminum, dissolved m /I -0.03 0.05 0.03 -0.03 U Aluminum, total m /I Anions me /I 2.7 4.4 3.8 3.6 Arsenic, dissolved m /I Arsenic, total m /I -0.005 0.0008 0.002 0.0005 B Bicarbonate m /I 116 188 140 115 1 1 Boron, dissolved m /I -0.01 0.02 0.02 B Cadmium, dissolved m /I -0.005 -0.005 -0.005 U Calcium, total m /I Calcium, dissolved m /I 21.1 33.9 30.3 29.0 Carbonate m /I -2 7 1 7 B Cation - Anion Balance % -7.3 0 -2.60 -1.4 Cations me /I 2.6 4.3 3.6 3.5 Chloride m /I 2 4 3 2 B Conductivity mhos/cm 250 426 354 357 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Hardness m /I 79 125 107 98 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 0.02 0.11 0.05 -0.02 U Iron, total m /I 0.53 1.96 1.02 2.43 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 6.3 9.9 7.5 6.1 Manganese, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Manganese, total m /I -0.005 0.037 0.019 0.025 B Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U Molybdenum, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Nitrate as N m /I Nitrate/Nitrite as N m /I -0.02 0.33 0.16 -0.02 U Nitrite as N m /I H SU 7.6 8.4 8.2 8.6 H Phosphate m /I -0.03 0.24 0.09 0.21 Phosphorus Ortho , dissolved m /I -0.01 0.08 0.03 0.07 Potassium, dissolved m /I 1.2 2.2 1.62 1.3 B Selenium, dissolved m /I Selenium, total m /I Selenium, total recoverable m /I -0.001 -0.001 -0.001 0.0002 B Sodium Absorption Ratio SAR talc. 1.19 1.61 1.41 1.59 Sodium, dissolved m /I 23.9 41 33.2 35.7 Sulfate m /I 10 60 44 57 TDS Ratio calc. 0.99 1.38 1.14 1.11 TDS Calc. m /I 138 234 205 207 TDS m /I 190 270 230 230 TSS m /I -5 24, 10 62 Zinc, dissolved mg/I -0.01 0.03 0.02 -0.01 U ' Baseline 2006 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). West Elk Mine E-33 2009 Annual Hydrology Report HydroGeo, Inc.