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Well SOM-16-H Water Quality and Field Parameters C J C J r1 LJ Mountain Coal West Elk Mine Monitoring Location Well SOM-16-H Baseline 2003 Water Year Descrl tion Units Minimum Maximum Mean 4/12/2003 6/6/2003 9/19/2003 Field Parameters Water Level De th feet 1013.6 1014.3 1015.69 Electrical Conductivi umhos/cm H SU Tem erature oC Comment Laborato Parameters Name of Certified Lab Lab Reference # Sam le Date Lab Test Date Sam led B Alkalini Total CaCO3 m /I Aluminum, dissolved m /I Ammonia m /I 1.1 17.8 12.3 Anions me /I Arsenic, dissolved m /l 0 0 0 Arsenic, total m /I Bicarbonate m /I 0 798 89 Boron, dissolved m /I Cadmium, dissolved m /I o 0 0 Calcium, dissolved m /I 120 120 120 Carbonate m /I Cation -Anion Balance Cations me !I Chloride m A 91 240 153 Conductivi umhos/cm 5970 6560 6265 Co r, dissolved m 11 Hardness m /I 300 1140 720 H droxide m /I Iron, dissolved m /I 0 2.19 0.79 Iron, total m A 0.02 57.6 Z5 Lead, dissolved m /I o 0 0 Ma nesium, dissolved m 11 0 0 0 Man anese, dissolved m /I o 0.03 0.009 Man anese, total m /I o 1.05 0.11 Mercu ,dissolved m /I o 0 0 Mol bdenum, dissolved m A Nitrate/Nitrite as N m A 0 0.4 0.12 Nitro en, ammonia m /I H SU Phos hate m /I Phos horns Ortho ,dissolved m /I o 0.07 0.009 Potassium, dissolved m /I Selenium, dissolved m l 0 0 0 Selenium, total m /I Sodium Absor tion Ratio SAR talc. 6.27 24.1 12.79 Sodium, dissolved m /I 582 582 582 Sulfate m /1 23 42 32 TDS Ratio talc. TDS Calc. m /1 TDS m /I 34 2900 1890 TSS m /I Zinc, dissolved m /I o 0 0 AGZ - ACZ Labs, Steamboat S rin s, Colorado ' Standard is for reference ur oses onl NA - not a livable NM -not measured NR -not re orted West Elk Mine G-13 2003 Annual Hydrology Report HydroGeo, Inc.