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Well SOM-13 <br />Water Quality and Field Parameters <br />• <br />• <br />u <br />Mountain Coal West Elk Mine <br />Monitoring Location Well SOM-13 Baseline 2009 Water Year <br />Description Units Minimum Maximum Mean <br />Field Parameters <br />Water Level Depth feet <br />Electrical Conductivity pmhos/cm <br />pH SU <br />Temperature (°F) OF <br />Comment Ca ing Compromised <br />Laboratory Parameters 3 <br />Name of Certified Lab 2 <br />Lab Reference # <br />Sample Date <br />Lab Test Date <br />Sampled B <br />Alkalinity (Total CaC03) mg/I <br />Aluminum, dissolved m /I <br />Ammonia m /l 0.375 0.487 0.421 <br />Anions me /I <br />Arsenic, dissolved m q/1 <br />Arsenic, total m /I <br />Bicarbonate m /I 460 590 511 <br />Boron, dissolved m /l <br />Cadmium, dissolved m /I <br />Calcium, dissolved m /I <br />Carbonate m /I <br />Cation - Anion Balance % <br />Cations me /l <br />Chloride m /l 6 13 10 <br />Conductivity 4mhos/cm <br />Copper, dissolved m /I <br />Hardness m /I 249 292 264 <br />Hydroxide m /l <br />Iron, dissolved m /I o 0.027 0.009 <br />Iron, total m /I 0.37 1.07 0.61 <br />Lead, dissolved m /I <br />Magnesium, dissolved m /I <br />Manganese, dissolved m /I 0.006 0.026 0.013 <br />Manganese, total m /I <br />Mercury, total m /l <br />Molybdenum, dissolved m /l <br />Nitrate/Nitrite as N m /I <br />Nitrogen, ammonia mg/1 <br />H SU 7.15 7.55 7.37 <br />Phosphate m /l <br />Phosphorus Ortho , dissolved m /l 0 0.065 0.012 <br />Potassium, dissolved m q/1 <br />Selenium, dissolved m /I <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR calc. <br />Sodium, dissolved m /I <br />Sulfate m /I 32.9 77.5 61 <br />TDS Ratio calc. <br />TDS Calc. m /I <br />TDS m /I 512 688 622 <br />TSS m /l <br />Zinc, dissolved mg/I <br />Baseline and WY 2000 data adapted from WWE (2001). <br />West Elk Mine <br />G-10 2009 Annual Hydrology Report HydroGeo, Inc.