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Well SOM-80 <br />Water Quality and Field Parameters <br />• <br />• <br />G-9 <br />Mountain Coal West Elk Mine <br />Monitoring Location Well SOM-80 Baseline' 2009 Water Year <br />Description Units Minimum Maximum Mean 517/2009 5/24/2009 8/12/2009 Q' <br />Field Parameters <br />Water Level Depth feet 93.0 92.9 93.1 <br />Electrical Conductivity mhos/cm 1002 996 1027 <br />H SU 7.15 7.26 7.26 <br />Temperature °C 11.6 9.7 12.6 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Lab 2 ACZ <br />Lab Reference # L77515-05 <br />Sample Date 8/12/2009 <br />Lab Test Date 8/14-8/19 <br />Sampled B PH <br />Alkalinity (Total CaC03) mg/I <br />Aluminum, dissolved m /I <br />Ammonia m /I 0 1.73 0.51 <br />Anions me /I <br />Arsenic, dissolved m /I 0 0 0 <br />Arsenic, total m /I <br />Bicarbonate m /I 213 641 443 <br />Boron, dissolved m /l <br />Cadmium, dissolved M g/1 0 0 0 <br />Calcium, dissolved m /I 60.2 60.2 60.2 <br />Carbonate m /I <br />Cation - Anion Balance % <br />Cations me /I <br />Chloride m /I 3 17 7 <br />Conductivity mhos/cm 886 897 892 951 <br />Copper, dissolved m /I <br />Hardness m /I 45 754 389 <br />Hydroxide m /I <br />Iron, dissolved M g/1 0 0.82 0.15 0.05 <br />Iron, total m /I 0 6.6 0.71 1.21 <br />Lead, dissolved m g/1 0 0 0 <br />Magnesium, dissolved m /I 17.6 17.6 17.6 <br />Manganese, dissolved m /I 0.005 0.01 0.008 <br />Manganese, total m g/1 0 0.557 0.066 <br />Mercury, dissolved m /I 0 0 0 <br />Molybdenum, dissolved m /I <br />Nitrate/Nitrite as N m /I 0.24 0.49 0.33 <br />Nitrogen, ammonia M g/1 <br />H SU 6.7 8.1 7.41 1 8.2 H <br />Phosphate m /I <br />Phosphorus Ortho , dissolved m /I 0 0.3 0.049 <br />Potassium, dissolved m g/1 <br />Selenium, dissolved m /I 0 0 0 <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR calc. 1.94 5.22 2.91 <br />Sodium, dissolved m /l 129 129 129 <br />Sulfate m /I 70 984 515 <br />TDS Ratio talc. <br />TDS Calc. m g/1 <br />TDS m /l 26.8 1888 668 610 <br />TSS m g/11 13 B <br />Zinc, dissolved mg/I 0.02 0.02 0.02 <br />'Baseline and WY 2000 data adapted from WWE (2001). <br />2 ACZ Laboratory, Steamboat Springs, CO <br />3 Negative values denote readings below lab detection levels. <br />"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 />2009 Annual Hydrology Report HydroGeo, Inc.