2009-07-01_REPORT - C1980007 (8)

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Well SOM-23-1-1-3 Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location: SOM-23-1-1-3 Baseline' 2008 Waiter Year Description Units Minimum Maximum a Mean ° 5/5/2008 6/7/2008 8/22/2008 Enviro- Chem MDL Field Parameters Water Level Depth feet 180.59 166.50 183.86 204.9 203.7 207.2 Electrical Conductivity mhos/cm 1690 3210 2490 2090 2110 2130 H SU 8.40 8.76 8.59 8.16 8.63 8.64 Temperature °C 11.4 10.5 12.0 Comment Laboratory Parameters 3 Name of Certified Lab Enviro-Chem Lab Reference # 08/1520 Sample Date 8/22/2004 Lab Test Date 8/22-9/11 Sampled B P. Holder Alkalinity (Total CaC03) mg/l 937 1240 1144 950.32 2 Aluminum, dissolved m g/1 Ammonia m /l 0.03 0.09 0.05 0.48 0.05 Anions me /I 19.3 23.9 22.8 1.323 calc Arsenic, dissolved m g/1 -0.001 -0.001 -0.001 0.046 0.001 Arsenic, total m /l Bicarbonate m /I 896 1100 1034 Boron, dissolved m /I 0.64 1.45 0.80 1.01 0.01 Cadmium, dissolved m g/1 -0.005 -0.005 -0.005 0.007 0.001 Calcium, dissolved m /l 2.8 12.6 4.7 2.24 0.1 Carbonate m g/1 40 140 111 Cation - Anion Balance % -2.4 2.0 0.9 2.86 calc Cations me /l 20.1 23.7 22.6 1.362 calc Chloride m /l 4 6 5 1.26 0.1 Conductivity pmhos/cm 1560 2170 1945 1738.6 1 Copper, dissolved m /I Hardness m /l 13 57 22 11.48202 calc Hydroxide m /l -2 -2 -2 Iron, dissolved m /l 0.12 10.70 2.63 0.12 0.01 Iron, total m g/1 2.77 866*/ 10.7** 149.07*/5,69** 1.04 0.01 Lead, dissolved m /l -0.0001 0.0046 -72.1652 0.005 0.005 Magnesium, dissolved m /I 1.3 6.1 2.2 1.43 0.1 Manganese, dissolved m /I 0.019 0.310 0.077 0.01 0.005 Manganese, total m /l 0.040 1.79 0.349 0.081 0.005 Mercury, dissolved m g/1 -0.0002 0.0127 0.0019 0.00013 0.000025 Mercury, total m /I Molybdenum, dissolved m /l Nitrate as N dissoloved m /l -0.02 0.07 0.02 0 0.13 Nitrate/Nitrite as N m /l -0.02 0.07 0.03 0 0.13 Nitrite as N dissoloved m /I -0.01 -0.01 -0.01 0.02 0.01 Nitrogen, ammonia m /1 0.59 1.27 0.74 H SU 8.4 8.9 8.7 8.95 0.1 Phosphate m /I -0.03 0.24 0.08 0 0.08 Phosphorus Ortho , dissolved m /l -0.01 0.08 0.03 0.02 0.01 Potassium, dissolved m /I 2.5 3.3 2.9 3.48 0.1 Selenium, dissolved m /l -0.001 0.002 0.001 0 0.001 Selenium, total m /I Sodium Absorption Ratio SAR calc. 25.1 61.4 53.0 0.319 calc Sodium, dissolved m g/1 428 526 501 453.75 0.1 Sulfate m /l -10 20 7 2.06 2 5 TDS Ratio calc. 0.92 1.00 0.96 8.03 calc TDS Calc. m /l 1060 1310 1240 1417.37 2 TDS m /I 970 1270 1197 1212 2 TSS m /I i 4 - - Zinc, dissolved mg/I -0.01 0.04 0.01 0.007 0.005 Baseline 2005 2 Enviro-Chem Analytical, Grand Junction, CO 3 Zero values denote readings below lab detection levels (MDL). 4 Average (mean) value talc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit 5 Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Calc.)) / TDS)] * 100 e Suspect data June 6 2005 for total iron; * indicates data incl suspect data; ** indicates calc exlcuding suspect data G-17 West Elk Mine 2008 Annual Hydrology Report HydroGeo, Inc.