2008-06-27_REPORT - C1980007 (7)

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Well SOM-3-E Water Quality and Field Parameters C? • • Mountain Coal West Elk Mine Monitoring Location Well SOM -3-E Baseline' 2007 Water Year Description Units Minimum Maximum Mean 4/29/2007 5/25/2007 8/27/2007 Q Field Parameters Water Level Depth feet 981.2 984.0 982.1 Electrical Conductivity µmhos/cm 2280 2280 2260 H SU 8.42 8.19 8.19 Temperature (?) OF 67.1 67.1 65.1 Temperature °C 19.5 19.5 18.4 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L64673-02 Sample Date 8/27/2007 Lab Test Date 8/28-9/13 Sampled B Alkalinity (Total CaCO3) mg/I 1050 1360 1252 1280 Aluminum, dissolved m /I Ammonia m /I 0.08 0.08 0.08 0.01 B Anions me /I 25.2 33.3 27.9 25.7 Arsenic, dissolved m /I -0.001 0.0027 0.0005 -0.005 U Arsenic, total m q/1 Bicarbonate m /l 1050 1360 1242, 1150 Boron, dissolved m /I 1.11 1.11 1.11 1.39 Cadmium, dissolved m /I -0.03 -0.01 -0.01 -0.005 U Calcium, dissolved m /l 2.6 33 6 3.6 Carbonate m /l -2 42 11 129 Cation - Anion Balance % .-6.6 4.4 1.1 0.4 Cations me /I 26.3 29 28 25.9 Chloride m /I 4 42 9 4 B Conductivity µmhos/cm 2040 2090 2067 2220 Copper, dissolved m /I Hardness m /I 19 128 56 12 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 0.05 127 10.41 0.13 Iron, total m /I 8.95 419 151 177 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.0001 U Magnesium, dissolved m /I 0.7 11.0 2.1 0.8 B Manganese, dissolved m /I 0.01 1.640 0.170 U Manganese, total m /I 0.139 5.21 1.87 2.380 Mercury, dissolved m /l -0.0002 0.0016 0.0002 -0.0002 U Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N m /I 0.03 0.22 0.14 -0.02 U Nitrate/Nitrite as N m /l -0.2 2.8 0.3 0.02 U Nitrite as N m /I 0.01 0.01 0.01 -0.01 U,H Nitrogen, ammonia m /I 0.61 2.17 0.89 0.49 B H SU 8.2 8.4 8.3 8.8 H Phosphate m /I -0.03 1.4 0.2 0.18 Phosphorus Ortho , dissolved m /I -0.01 0.45 0.05 0.06 Potassium, dissolved m /I 3.7 6.5 4.6 3.4 Selenium, dissolved m /l -0.002 0.000 -0.001 -0.0001 U Selenium, total m /I Sodium Absorption Ratio SAR calc. 23 61 46 73.00 Sodium, dissolved m /I 304 628 546 581 Sulfate m /I -10 530 49 -10 U TDS Ratio calc. 0.83 1.00 0.93 0.97 TDS Calc. m /I 1380 1850 1543 1410 TDS m /I 1330 1540 1395 1370 TSS m /I Zinc, dissolved mg/I -0.01 0.91 0.10 -0.01 U Baseline 2004. 2 ACZ Labs, Steamboat Springs, Colorado 3 Negative values denote readings below lab detection levels a Average (mean) value calc using 1/2 of detection limit for readings below lab detection limit unless all i 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 G-20 2007 Annual Hydrology Report HydroGeo, Inc.