2008-06-27_REPORT - C1980007 (7)

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Well SOM-16-H Water Quality and Field Parameters • • E G-15 Mountain Coal West Elk Mine Monitoring Location Well SOM-16-H Baseline 2007 Water Year Description Units Minimum Maximum Mean Field Parameters Water Level Depth feet Electrical Conductivity µmhos/cm pH SU Temperature of Comment Obstructed Obstructed Obstructed Laboratory Parameters 3 Name of Certified Lab z Lab Reference # Sample Date Lab Test Date Sampled By Alkalinity (Total CaCO3) mg/I Aluminum, dissolved mg/l Ammonia mg/I 1.1 17.8 12.3 Anions meq/1 Arsenic, dissolved mg/I 0 0 0 Arsenic, total mg/I Bicarbonate mg/l 0 798 89 Boron, dissolved mg/I Cadmium, dissolved mg/l 0 0 0 Calcium, dissolved mg/I 120 120 120 Carbonate mg/l Cation - Anion Balance % Cations meq/1 Chloride mg/l 91 240 153 Conductivity µmhos/cm 5970 6560 6265 Copper, dissolved mg/I Hardness mg/l 300 1140 720 Hydroxide mg/l Iron, dissolved mg/1 0 2.19 0.79 Iron, total mg/I 0.02 57.8 7.5 Lead, dissolved mg/I 0 0 0 Magnesium, dissolved mg/l 0 0 0 Manganese, dissolved mg/1 0 0.03 0.009 Manganese, total mg/l 0 1.05 0.11 Mercury, dissolved mg/l 0 0 0 Molybdenum, dissolved mg/I Nitrate/Nitrite as N mg/I 0 0.4 0.12 Nitrogen, ammonia mg/l pH SU Phosphate mg/l Phosphorus (Ortho), dissolved mg/I 0 0.07 0.009 Potassium, dissolved mg/I Selenium, dissolved mg/I 0 0 0 Selenium, total mg/I Sodium Absorption Ratio (SAR) calc. 6.27 24.1 12.79 Sodium, dissolved mg/I 582 582 582 Sulfate mg/l 23 42 32 TDS Ratio calc. TDS (Calc.) mg/1 TDS mg/l 34 2900 1890 TSS mg/I Zinc, dissolved mg/l 0 0 0 1 Baseline andWY 2000 data adapted from WWE (2001). 2 ACZ Labs, Steamboat Springs, Colorado 3 Negative values denote readings below lab detection levels West Elk Mine 2007 Annual Hydrology Report HydroGeo, Inc.