2008-06-27_REPORT - C1980007 (6)

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Spring WCC-24 Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location: Spring WCC-24 Baseline' 2007 Water Year Description Units Minimum Maximum Mean" 4/27/2007 5/30/2007 QS 8/24/2007 Field Parameters Flow m 6.12 40.85 23.36 56.77 60.0 88.67 Electrical Conductivity µmhos/cm 1778 3240 2319 1479 1835 1770 H SU 7.3 8.64 8.05 8.42 8.08 7.97 Temperature OF 52.6 66.2 55.65 55.6 50.9 55.2 Temperature °C 11.4 19.0 13.10 13.1 10.5 12.9 Comment Laboratory Parameters 3 Name of Certified Lab z ACZ Lab Reference # L62931-06 Sample Date 5/30/2007 Lab Test Date 5/31-6/21 Sampled B Alkalinity (Total CaCO3) mg/l 323 406 368 286 Aluminum, dissolved m /I -0.03 0.04 0.02 -0.03 U Aluminum, total m /I Anions me /1 22.5 25.3 24.2 20.9 Arsenic, dissolved m /I Arsenic, total m /I 0.00079 0.0086 0.0070 0.0072 Bicarbonate m /l 321 406 364 286 Boron, dissolved m /I 0.74 0.86 0.79 0.75 Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, total m /l Calcium, dissolved m q/1 165 197 180 158 Carbonate m /l -2 16 4 -2 U Cation - Anion Balance % -2 2 -0.2 2.6 Cations me /I 23.2 25.8 24.2 22.0 Chloride m /I 2 4 3 3 B Conductivity µmhos/cm 1710 2070 1925 1710 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Hardness m /I 856 969 905 827 Hydroxide m /I 2 -2 -2 -2 U Iron, dissolved m /l -0.02 0.07 0.03 0.06 Iron, total m /l -0.02 0.53 0.20 0.31 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m q/1 106 116 111 105 Manganese, dissolved m /I -0.005 0.009 0.003 -0.005 U Manganese, total m /I -0.005 0.053 0.012 0.015 B Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U Molybdenum, dissolved m /l -0.01 0.02 0.01 0.01 B Nitrate as N m /I Nitrate/Nitrite as N m /I 2.39 2.97 2.62 0.11 Nitrite as N m /I F{ SU 8.1 8.4 8.2 8.2 H Phosphate m /I 0.12 0.34 0.24 0.15 Phosphorus Ortho , dissolved m /l 0.04 0.11 0.08 0.05 Potassium, dissolved m /I 22.9 26.9 25.0 23.2 Selenium, dissolved m /l Selenium, total m /I 0.014 0.019 0.016 0.017 Selenium, total recoverable m /l Sodium Absorption Ratio SAR calc. 1.71 1.85 1.81 1.72 Sodium, dissolved m /I 116 131 123 112 Sulfate m /I 760 820 800 720 TDS Ratio calc. 1.04 1.11 1.07 1.07 TDS Calc. m /l 1380 1530 1465 1290 TDS m /l 1460 1630 1561 1380 TSS m /I -5 48 12 26 Zinc, dissolved m /l -0.01 0.03 0.02 0.03 B Zinc, total mg/l ' Baseline 2006 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels 4 Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab 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. IB - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). West Elk Mine E31 2007 Annual Hydrology Report HydroGeo, Inc.