2008-06-27_REPORT - C1980007 (5)

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Poison Gulch Surface Water Quality and Field Parameters • • • C-21 Mountain Coal West Elk Mine Monitoring Location: Poison Gulch Baseline "4 2007 Water Year Description Units Minimum Maximum Mean 4/27/2007 5/30/2007 Q s 8/23/2007 Field Parameters' Flow m 15 60 D Electrical Conductivity µmhos/cm 308 356 H SU 7.81 7.57 Temperature °C °C 12.5 4.4 Temperature °F OF 54.5 39.9 Comment Laboratory Parameters 3 Name of Certified Labs ACZ Lab Reference # L62931-10 Sample Date 5/30/2007 Lab Test Date 5-31-6/21 Sampled B Alkalinity (Total CaC03) mg/I 119 152 136 157 Aluminum, dissolved m /I -0.03 -0.03 -0.03 -0.03 U Anions me /1 2.4 3.0 2.7 3.2 Arsenic, dissolved m /I Arsenic, total m /I -0.0005 0.0007 0.0005 0.0008 B Bicarbonate m /I 119 152 136 157 Boron, dissolved m /I 0.02 0.03 0.03 0.02 B Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m g/11 22.0 35.5 28.8 38.0 Carbonate m /l -2 -2 -2 -2 U Cation - Anion Balance % -2.1 7.7 4.4 8.6 Cations me /I 2.3 3.5 2.9 3.8 Chloride m /I 1 1 1 2 B Chromium m /I Conductivity µmhos/cm 240 295 268 321 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Cyanide, total m /I Hardness m /I 78 124 tol l- 134 Hydroxide m /l -2 -2 -2 -2 U Iron, dissolved m /l 0.07 0.11 0.09 0.04 B Iron, total m /I 0.41 0.43 0.42 3.14 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Lead, total m /I Magnesium, dissolved m /I 5.6 8.6 7.1 9.4 Manganese, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Manganese, total m /I -0.005 0.010 0.006 0.071 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 Nickel, dissolved mall Nitrate as N), dissolved m /l Nitrate/Nitrite as N m /I -0.02 U Nitrite as N , dissolved m /I H SU 7.8 8.1 8.0 8.0 H Phosphate m /I 0.21 0.21 0.21 0.12 B Phosphorus Ortho , dissolved m /1 0.07 0.07 0.07 0.04 B Potassium, dissolved m /l 2.9 2.9 2.9 2.3 Selenium, dissolved m /l Selenium, total m /I -0.001 -0.001 -0.001 -0.001 U Silver, total m /I Sodium Absorption Ratio SAR calc. 0.82 0.92 0.87 0.93 Sodium, dissolved m /I 16.6 23.3 20.0 24.6 Sulfate m /I -10 -10 -10 -10 U TDS Ratio calc. 1.04 .1.08 1.06 1.17 TDS Calc. m /I 120 163 142 171 TDS m /I 130 170 150 200 TSS m /I -5 28 15 118 Zinc, dissolved mg/I -0.01 -0.01 -0.01 -0001 U Baseline 2005. z 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 s 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 West Elk Mine HydroGeo, Inc. 2007 Annual Hydrology Report