2008-06-27_REPORT - C1980007 (6)

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Deer Creek Spring Water Quality and Field Parameters Mountain Coal West Elk Mine Monitoring Location: Deer Creek Spring Baseline' 2007 Water Year Description Units Minimum Maximum Mean 4 4/27/2007 5/30/2007 Q 5 8/23/2007 Field Parameters Flow m 0.94 4.15 2.88 5.86 7.65 See Electrical Conductivity µmhos/cm 574 889 735 654 647 692 H SU 6.72 7.77 7.10 7.43 7.15 7.50 Temperature OF 44.7 63.4 51.7 44.2 46.4 61.3 Temperature °C 7.1 17.4 10.9 6.8 8.0 16.3 Comment Laboratory Parameters 3 Name of Certified Lab ACZ Lab Reference # L62931-08 Sample Date 5/30/2007 Lab Test Date 5/31-6/21 Sampled B Alkalinity (Total CaC03) mg/I 294 302 298 263 Aluminum, dissolved m /I -0.03 -0.03 -0.03 -0.03 U Aluminum, total m /I Anions me /I 6.6 6.9 6.7 5.9 Arsenic, dissolved m /I Arsenic, total m /I -0.005 -0.005 -0.005 -0.005 U Bicarbonate m /I 294 302 298 263 Boron, dissolved m /I -0.01 -0.01 -0.01 0.03 B Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, total m /I Calcium, dissolved m /I 64.8 68.6 66.8 65.2 Carbonate m /I -2 -2 -2 -2 U Cation - Anion Balance % -5.3 0.0 -2.1 1.7 Cations me /I 6.2 6.6 6.425 6.1 Chloride m /I 3 4 3 3 B Conductivity µmhos/cm 587 660 611 590 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Hardness m /I 241 255 249 239 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I -0.02 -0.02 -0.02 -0.02 U Iron, total m /I -0.02 0.20 0.10 0.22 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 19.1 20.4 20.0 18.5 Manganese, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Manganese, total m /I -0.005 0.005 0.003 0.007 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 1.92 2.33 2.16 1.79 Nitrite as N m /I H SU 7.9 8.2 81 7.7 H Phosphate m /I -0.03 0.03 0.02 0.03 B Phosphorus Ortho , dissolved m /I -0.01 0.01 0.02 0.01 B Potassium, dissolved m /I 1.9 2.1 2.0 1.8 B Selenium, dissolved m /I Selenium, total recoverable m /I -0.001 -0.001 -0.001 -0.001 U Sodium Absorption Ratio SAR talc. 0.87 0.95 0.92 0.83 Sodium, dissolved m /I 31.1 34.7 33.0 29.2 Sulfate m /I 30 40 33 30 B TDS Ratio calc. 0.95 1.06 1.02 1.14 TDS Calc. m /I 329 341 336 306 TDS m /I 320 360 343 350 TSS m /I -5 14 5 8 B Zinc, dissolved m /I 0.02 0.02 0.02 0.01 B Zinc, total mg/I 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. B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). West Elk Mine E-30 2007 Annual Hydrology Report HydroGeo, Inc. 'i