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Well SOM-80 Water Quality and Field Parameter r1 ~J • Mountain Coal West Elk Mine Monitorin Location Well SOM-80 Baseline 2004 Water Year Descri lion Units Minimum Maximum Mean 5/4/2004 5/27/2004 9/7/2004 Field Parameters Water Level De th feet sa.o8 94.18 95.23 Electrical COndudivity µmhos/Cm 1170 1282 1090 H SU 6.75 8.88 8.8 Tem erature °C 56.3 55.5 58.8 Comment Laborato Paremeters Name of Certified Lab AC2 Lab Reference # La7654-oa Sam le Date sr7/2so4 lab Tesl Date s/10-a/28 Sam led B Alkalinity (Total CaCO~) mg/I Aluminum, dissolved m /I Ammonia m /I 0 1.73 0.51 Anions me /I Arsenic, dissolved m R o 0 0 Arsenic, total m /I Bicarbonate m A 2t3 Sal a43 Boron, dissolved m ll Cadmium dissolved m 11 0 0 0 Calcium, dissolved m A so.2 80.2 so.z Carbonate m A Cation -Anion Balance Cations me /1 Chloride m /I 3 17 7 COndUClivily µmhos/Gm 886 897 892 7130 Co er, dissolved m /I Hardness m /I a5 754 3as H droxide m /i Iron, di55olved m A 0 0.82 0.15 0.38 Iran, total m n o s.e 0.71 2.t2 Lead, dissolved m A o 0 0 Ma nesium, dissolved m /I t7.s 17.6 17.8 Man anese, dissolved m /I O.ooS 0.01 O.o08 Man anese total m I 0 0.557 0.066 Mercu ,dissolved m A o 0 0 Mol bdenum, dissolved m /I Nitrate/Nitrite as N m fl 0.24 0.49 0.33 Nitro en, ammonia m /I H SU 8.7 8.1 7.4 7.4 Phos hate m /I Phos horns Ortho ,dissolved m /I o 0.3 o.o4s Potassium, dissolved m /I Selenium, dissolved m /I o 0 0 Selenium, total m /l Sodium Abso lion Ratio SAR talc. 1.94 5.22 2.91 Sodium, dissolved m A 129 1zs 1zs Sulfate m A 7o se4 s75 TDS Ratio talc. TDS Calc. m /l TDS m /I 26.8 t888 888 870 TSS m /I Zinc, dissolved mg/I o.oz o.oz 0.02 ACZ Labs, Steamboat S rin s, Colorado Ne alive values denote readin s below lab detection levels NA - not a licable NM -not measured NR -not re orted West Elk Mine G-12 2004 Annual Hydrology Report HydroGeo, Inc.