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Well SOM-05-H-1 Water Quality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location Well SOMOS-H-1 Baseline 2003 Water Year Desch lion Units Minimum Maximum Mean 4/14/2003 6/6/2003 9/30/2003 Field Parameters Water Level De th feet 315.59 315.52 315.62 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 Anions me /I Arsenic, dissolved m /I 0.001 0.001 0.007 Arsenic, total m /I Bicarbonate m /I 768 768 768 Boron, dissolved m /I Cadmium, dissolved m /I 0 0 0 Calcium, dissolved m /I 6 6 6 Carbonate m /I Cation -Anion Balance Cations me /I Chlodde m /I 9 9 9 Conductivi umhos/cm Co er, dissolved m /I Hardness m I 23 23 23 H droxide m /I Iron, dissolved m I o.3a 0.34 0.3a Iron, total m /I Lead, dissolved m /I Ma nesium, dissolved m /I 1.9 1.9 1.9 Man anese, dissolved m /I 0.056 0.056 0.056 Man anese, total m /I Mercu ,total m /I 0 0 0 Mol bdenum, dissolved m /I Nitrate/Nitrite as N m /I 0 0 0 Nitro en, ammonia m P H SU Phos hate m /I Phos horns Ortho ,dissolved m 8 0.007 0.007 0.007 Potassium, dissolved m A Selenium, dissolved m /I 0 0 0 Selenium, total m A Sodium Abso lion Ratio SAR talc. 32.9 32.9 32.9 SOdium, dissolved m /I 357 357 357 Sulfate m /I 30 30 30 TDS Ratio talc. TDS Calc. m /I TDS m /I 850 850 850 TSS m /I Zinc, dissolved m /I 0.01 0.07 0.01 ACZ - ACZ Labs, Steamboat S do s, Colorado ' Standard is for reference u oses onl NA - not a livable NM -not measured NR -not re orted West EIk Mine G-8 2003 Annual Hydrology Report HydroGeo, Inc.