2008-06-27_REPORT - C1980007 (6)

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• Deep Creek Spring 2 Watelsity and Field Parameters • Mountain Coal West Elk Mine Monitoring Location : Deep Creek Spring #2 Baseline' 2007 Water Year Description Units Minimum Maximum Mean 4/30/2007 Q 5/29/2007 Q 7/2/2007 Q 8/9/2007 Q 9/11/2007 Q 9/27/2007 Q Field Parameters Flow m 0.19 0.29 0.24 0.27 0.29 0.27 0.25 0 19 0 19 Electrical Conductivit umhos/cm 396 453 433 396 426 433 438 . 451 . 453 H SU 7.97 8.19 8.09 8.19 8.11 8.11 6.13 7.97 8.03 Temperature °F 44.8 56.1 50.7 56.1 49.5 54.0 49.6 50.4 44.8 Temperature °C 7.1 13.4 10.4 13.4 9.7 12.2 9.8 10.2 7.1 Comment Laboratory Parameters' Name of Certified Labe Lab Reference # ACZ L62286-02 ACZ L62928-06 ACZ L63600-03 ACZ L64362 ACZ L64966-04 ACZ L65367-01 Sample Date 4/30/2007 5/29/2007 7/2/2007 8/9/2007 9/11/2007 9/27/2007 Lab Test Date 5/1-5/23 5/31-6/18 7/3-7/19 8/13-8/29 9/13-9/27 10/1-10/19 Sampled B Alkalinity Total CaCO3 m /I 167 219 195 167 172 198 195 216 219 Aluminum, dissolved m /I -0.03 0.09 -0.06 -0.03 U 0.03 B -0.03 U 0.09 B 0.09 B 0.09 B Anions me q4 3.8 4.8 4.3 3.8 3.9 4.4 4.3 4.7 4.8 Arsenic, dissolved mg/I Arsenic, total mg/l -0.0005 0.0012 -0.0006 0.0008 B -0.0005 U -0.0005 U 0.0012 -0.0005 U 0.0010 B Bicarbonate m A 159 211 185 159 166 183 188 203 211 Boron, dissolved m /I 0.01 0.02 0.01 0.01 B 0.01 B 0.01 B 0.01 B 0.02 B 0.01 B Cadmium, dissolved m A -0.005 -0.005 -0.005 -0.005 U -0.005 U -0.005 U -0.005 U -0.005 U -0.005 U Calcium, dissolved m A 41.6 47.8 44.2 41.6 42.2 44.3 42.8 46.3 47.8 Carbonate m A 6 14 9 8 B 6 B 14 B 7 B 12 B 8 B Cation - Anion Balance m A 0.0 4.9 1.8 3.8 4.9 1.1 0.0 0.0 1 0 Cations me /I 4.1 4.9 4.5 4.1 4.3 4.5 4.3 4.7 . 4.9 Chloride m /I 2 3 2 2 B 3 B 2 B 2 B 2 B 2 B Conductivity µmhos/cm 393 440 422 401 393 432 430 436 440 Copper, dissolved m /I -0.01 0.03 -0.01 -0.01 U -0.01 U -0.01 U -0.01 U 0.03 B -0.01 U Hardness m A 127 147 136 127 131 137 132 143 147 Hydroxide m A -2 -2 -2 -2 U -2 U -2 U -2 U -2 U -2 U Iron, dissolved m /I 0.02 0.08 0.05 0.06 0.05 0.02 B 0.08 0.02 B 0.07 Iron, total m /I 1.07 9.71 3.70 6.38 1.83 1.07 9.71 1.31 1.90 Lead, dissolved m I -0.04 -0.04 -0.04 -0.04 U -0.04 U -0.04 U -0.04 U -0.04 U -0.04 U Magnesium, dissolved m A 5.7 6.7 6.3 5.7 6.1 . 6.5 6.2 6.7 6.7 Manganese, dissolved m A -0.005 0.008 -0.003 -0.005 U -0.005 U -0.005 U -0.005 U 0.008 B -0.005 U Manganese, total m A 0.018 0.146 0.057 0.146 0.024 B 0.018 B 0.109 0.022 B 0.024 B Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U -0.0002 U -0.0002 U -0.0002 U -0.0002 U -0.0002 U Molybdenum, dissolved m I -0.01 -0.01 -0.01 -0.01 U -0.01 U -0.01 U -0.01 U -0.01 U -0.01 U Nitrate as N), dissolved m Ntrate/Nitrite as N m A -0.02 0.25 -0.08 -0.02 U -0.02 U -0.02 U 0.03 B 0.18 0.25 Nitrite as N), dissolved m /I H SU 8.4 8.5 8.4 8.4 H 8.4 H 8.5 H 8.4 H 8.5 H 8.4 H Phosphate Phosphorus Ortho , dissolved Potassium, dissolved Selenium, total Sodium Absorption Ratio SAR m I m A m A m A talc. -0.03 -0.01 0.9 -0.001 1.37 0.18 0.06 1.4 -0.001 1.63 -0.05 -0.02 1.2 -0.001 1.49 0.03 0.01 0.9 -0.001 1.37 B B B U -0.03 -0.01 1.4 -0.001 1.46 U H,U B U -0.03 -0.01 1.1 -0.001 1.47 U U B U 0.18 0.06 12 -0.001 1.45 I 0.06 0.02 1.2 -0.001 1.55 B B B U -0.03 -0.01 1.4 -0.001 1.63 U H,U F - U Sodium, dissolved m I 35.1 44.8 39.5 35.1 37.9 39.2 37.8 42.2 44.8 Sulfate m /I 20 20 20 20 B 20 B 20 B 20 B 20 B 20 B TDS Ratio calc. 1.01 1.16 1.06 1.10 1.16 1.01 1.04 1.03 1 01 TDS Calc. m A 209 257 234 209 216 237 230 252 . 257 TDS mg/I 230 260 247 230 250 240 240 260 260 TSS Zinc, dissolved m A m A 6 -0.01 302 0.03 136 -0.01 256 -0.01 U 32 0.01 U 46 0.03 B 302 -0.01 U 6 0.01 B B 172 -0.01 U Baseline 2007 ACZ Laboratory, Steamboat Springs, CO Negative values denote readings below lab detection levels 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). E-35 West Elk Mine 2007 Annual Hydrology Report HydroGeo, Inc.