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Well 96-27-1 Water Quality and Field Parameters r U • Mountain Coal West EIk Mine Monitoring Location Well 96-27-1 Baseline 2003 water Year Descri lion Units Minimum Maximum Mean Field Parameters Water Level De th feet Electrical Conductivi umhos/cm 2400 2600 2510 H SU 8.2 8.9 8.5 Tem erature oC 16 19.2 17.9 Comment Obstruction Obstruction Obstruction Laborato Parameters Name of Certified Lab Lab Reference # Sam le Date Lab Test Date Sam led B Alkalini Total CaC03 m /I 1310 1480 1a00 Aluminum, dissolved m /I Ammonia m /I 0.1 0.1 0.1 Anions me /I 26.6 27.6 27.1 Arsenic, dissolved m /1 0 0.001 0 Arsenic, total m A Bicarbonate m /I 1310 1470 1369 Boron, dissolved m A Cadmium, dissolved m A 0 0 0 Calcium, dissolved m A 4.7 7.2 5.7 Carbonate m /I 0 73 31 Cation -Anion Balance % -1.9 4.1 0.8 Cations me A 25.s 29.5 27.s Chloride m 1 10 29 14 Conductivi umhos/om 2290 2350 2323 Co er, dissolved m /I Hardness m /I is 24 20 H droxide m /I 0 0 0 Ifon, dissolved m /I 0 1.32 0.24 Iron, total m /I 0.91 2.54 1.61 Lead, dissolved m /I o 0 0 Ma nesium, dissolved m /I t 2.1 1.46 Man anese, dissolved m /I 0 0.355 0.062 Man anese, total m /I 0.031 0.059 0.0413 Mercu ,dissolved m /I o 0 0 Mol bdenum, dissolved m /I Nitrate/Nitrite as N m /I 0 0.36 0.05 Nitr en, ammonia m /I 0.84 1.06 0.95 H SU 6.9 8.4 7.9 Phos hate m /I o 0 0 Phos horns Ortho ,dissolved m I 0 0.385 0.071 Potassium, dissolved m I 3.4 3.6 3.5 Selenium, dissolved m /I o 0 0 Selenium, total m /I Sodium AbsOr lion Ratio SAR talc. 58.5 67.3 63.7 Sodium, dissolved m /I 571 684 649 Sulfate m /I 0 10 3 TDS Ratio talc. TDS Calc. m /I TDS m /I 1080 1650 1487 TSS m /I 6s 104 81 Zinc, dissolved m P 0 0.37 0.06 ACZ -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-15 2003 Annual Hydrology Report HydroGeo, /nc.