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Well SO.W-t Watar Quality and Field Parometero ~J Mountain Coal West Elk Mlne Monitodn Location Well SO.W-7 Baseline 2004 Water Vear Descd lion Units tainimum Maximum Mean Field Parameters Water Level De th feet Elecldwl Conductivity µmhos/cm 1s8o 1s00 1790 H SU 9.i 9.9 9.5 Tem roture °C 16.4 17.3 18.7 Comment Obstructed Obstructed Obstructed Laboroto Parometero Name of Certifed Lab Lab Reference # Sam le Date Lab Test Date Sam led B Alkalinity (Total CaCO~) mg/1 286 B81 772 Aluminum, dissolved m /I Ammonia m /I 1.23 1.57 1.4 Anions me 11 18.3 19.6 18.9 Arsenic, dissolved m o boot o Arsenic, total m 0.001 O.OOi 0.001 BiCefbOnate m /I 288 737 601 Boron, dissolved m /I Cadmium, dissolved m /I o 0 0 Callum, dissolved m /I 2.1 2.a 2.8 Carbonate m I D 310 171 Cation -Anion Balance % 0.5 2.1 1.3 CaliOns m0 fl 18.1 20 19.4 Chloride m A 14 19 18 COnductivi µmh05/Cm 1670 1750 1703 Co er, dissolved m /I Hardness m /I 18 30 28 H droxitle m /I 0 0 0 Iron, dissolvetl m h 0.04 0.86 0.3 Iron, total m !1 2.59 7.07 4.14 Lead, dissolved m /I b 0 0 Ma nesium, dissolved m A 3.2 5.5 4.9 Man anese, dissolved m h o.01a 0.025 O.oi7 Man anese, total m h 0.044 0.102 0.067 Mercu ,dissolved m A 0 0 0 Mercu ,total m A o 0 0 Mo bdenum, dissolved m /I NitratelNitdte as N m /I o 0.15 0.03 Nitro en, ammonia m A 1.58 2.01 1.71 H SU 9.7 9.2 9.2 Phos hate m /I 0.04 0.04 0.04 Phos horns Ortho ,dissolved m A o 0 0 Potassium, dissolved m /I 8.7 7.1 8.9 Selenium, dissolved m !t 0 0 0 Selenium, total m /I o 0 0 Sodium Abso tion Ratio SAR talc. 33.7 40.8 36.4 Sotlium, dissolved m /I 398 437 420 Sulfate m /I 40 90 78 TDS Ratio talc. TDS Calc. m A TDS m fl 830 1100 1007 TSS m /I 0 38 21 Zinc, dissolved m 1 0.04 0.04 0.04 West Elk Mine G-20 2004 Annual Hydrology Report HydroGeo, Ina.