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Well SOM-129-H <br />Wafar f iinlity and Fialrt Paramatarc <br />0 <br />0 <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location Well SOM-129-H Baseline 2007 Water Year <br />Description Units Minimum Maximum Mean 4/26/2007 5/24/2007 8/22/2007 Q4_ <br />Field Parameters <br />Water Level Depth feet 231.5 232.1 232.5 <br />Electrical Conductivity µmhos/cm 13370 13,300 13070 <br />H SU 8.01 7.95 7.85 <br />Temperature (°F) OF 57.4 58.5 57.4 <br />Temperature (°C) °C 14.1 14.7 14.1 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Lab ACZ <br />Lab Reference # L64626-09 <br />Sample Date 8/22/2007 <br />Lab Test Date 8/27-9/6 <br />Sampled B <br />Alkalinity (Total CaCO3) mg/I <br />Aluminum, dissolved m /I <br />Ammonia rn /l <br />Anions me /I <br />Arsenic, dissolved m /I <br />Arsenic, total m /l <br />Bicarbonate m /I <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I <br />Calcium, dissolved m /I <br />Carbonate m /I <br />Cation - Anion Balance % <br />Cations me /I <br />Chloride m /I <br />Conductivity µmhos/cm 13200 <br />Copper, dissolved m /I <br />Hardness m /I <br />Hydroxide m /I <br />Iron, dissolved m /I 0.2 B <br />Iron, total m /I 0 9.5 2 0.4 <br />Lead, dissolved m /I <br />Magnesium, dissolved m /I <br />Manganese, dissolved m /I <br />Manganese, total m /I 0 0.3 0.1 <br />Mercury, dissolved m /I <br />Molybdenum, dissolved m /I <br />Nitrate/Nitrite as N m /I <br />Nitrogen, ammonia m /I <br />H lab SU 8.6 H <br />Phosphate m /I <br />Phosphorus Ortho , dissolved m /I <br />Potassium, dissolved m /I <br />Selenium, dissolved m /I <br />Selenium, total m /l <br />Sodium Absorption Ratio SAR talc. <br />Sodium, dissolved m /I <br />Sulfate m /I <br />TDS Ratio calc. <br />TDS Calc. m /I <br />TDS m /I 3208 3924 3559 8380 <br />TSS m /I 34 <br />Zinc, dissolved mg/I <br />Baseline andWY 2000 data adapted from WWE (2001). <br />2 ACZ Labs, Steamboat Springs, Colorado ° <br />3 Negative values denote readings below lab detection levels <br />4 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). <br />West Elk Mine <br />G-23 2007 Annual Hydrology Report <br />HydroGeo, Inc.