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Well GP-6 Water duality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location Well GP-6 Baseline 2003 Water Year Descri lion Units Minimum Maximum Mean 4/10/2003 614/2003 9/28/2003 Field Parameters Water Level De th feet 52.3 50.21 56.38 Electrical Conductivit umhos/cm 1044 1189 1212 H SU 7.42 7.35 7.04 Tem erature oC 56.2 56.4 54.3 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L43143-10 Sam le Date 9/29/2003 Lab Test Date 10/11-10/18 Sam led B Alkalinit Total CaCO3 m /I 502 Aluminum, dissolved m /I Ammonia m /I Anions me /I 10.9 Arsenic, dissolved /I 0.001 Arsenic, total m /I Bicarbonate m /I 502 Boron, dissolved m /I Cadmium, dissolved m /I -0.005 Calcium, dissolved m /I 60.7 Carbonate m A -2 Cation -Anion Balance % 2.2 Cations me /I 11.4 Chloride m /I 9 Conductivi umhos/cm 908 Co er, dissolved m /I Hardness m /I 241 H droxide m /I -2 Iron, dissolved m /I 0.23 Iron, total m /I o.sfi Lead, dissolved m /I -0.04 Ma nesium, dissolved m I 21.8 Man anese, dissolved m I 0.375 Man anese, total m /I 0.451 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m /I Nitrate/Nitrite as N m A 0.86 Nitro en, ammonia m /I 0.25 H SU e Phos hate m /I 0.03 Phos horns Ortho ,dissolved m I 0.01 Potassium, dissolved m /I 3.6 Selenium, dissolved m /I -0.001 Selenium, total m /I Sodium Absor lion Ratio SAR talc. 4.17 Sodium, dissolved m /I 147 Sulfate m /I 30 TDS Ratio talc. TDS Calc. m A TDS m /I 590 TSS m /I Zinc, dissolved m /I 0.04 ACZ -ACZ Labs, Steamboat S rin s, Colorado ' Standard is for reference ur ses onl NA - not a livable NM -not measured NR -not re orted West Elk Mine G-3 2003 Annual Hydrology Report HydroGeo, Inc-