2008-06-27_REPORT - C1980007 (7)

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Well SOM-3-B Water Qualitv and Field Parameters • Mountain Coal West Elk Mine Monitoring Location: Well SOM 3-B Baseline' 2007 Water Year Description Units Minimum Maximum Mean 4/29/2007 5/31/2007 8/27/2007 Q Field Parameters Water Level Depth feet NR 1165 NR Electrical Conductivity µmhos/cm NR 6140 6240 I-{ SU NR 7.72 7.53 Temperature (°C) °C 21.8 22.6 Temperature (°F OF 71.2 72.7 Comment Bailer Stuck. No FWQ Sounder coated in mud Laboratory ParameterS3 Name of Certified Lab z ACZ Lab Reference # L64673-01 Sample Date 8/27/2007 Lab Test Date 8/28-9/13 Sampled B Alkalinity (Total CaCQ) mg/I 1240 2060 1685 4000 Aluminum, dissolved m /I Ammonia m /I -0.01 -0.01 -0.01 0.01 B Anions me /I 35 39 37 82.0 Arsenic, dissolved m /I -0.0030 0.0020 -0.0002 -0.003 U Arsenic, total m a/1 Bicarbonate m /I 1240 2060 1685 4000 Boron, dissolved m /I 1.58 1.58 1.58 3.36 Cadmium, dissolved m /I -0.01 -0.01 -0.01 -0.03 U Calcium, dissolved m /I 0.8 37.7 8.2 17 Carbonate m /I -2 -2 -2 -2 U Cation - Anion Balance % -5.8 4.1 2.7 -2.8 Cations me /I 34.3 38.2 36.5 77.6 Chloride m /I 50 108 59 69 Conductivity µmhos/cm 2860 3070 2957 6370 Copper, dissolved m q/1 Hardness m /l 71 153 105 75 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 1.7 383 45.7 1.0 Iron, total m /I 156 445 275 1500 Lead, dissolved m /I -0.08 -0.08 -0.08 -0.0005 U Magnesium, dissolved m /I 2.8 14.2 6.1 8 Manganese, dissolved m /I 0.08 4.60 0.63 -0.03 U Manganese, total m /l 1.71 4.64 2.98 19.90 Mercury, dissolved m /I -0.0002 0.0006 0.0001 -0.0002 U Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N m /I 0.03 2.42 0.59 0.63 Nitrate/Nitrite as N m /I -0.20 2.42 0.45 0.63 Nitrite as N m /I 0.04 0.04 0.04 -0.01 U,H Nitrogen, ammonia m /I -0.1 1.8 0.7 1.1 B H SU 7.7 7.9 7.8 8.4 H Phosphate m /I 0.03 0.86 0.15 0.24 Phosphorus Ortho , dissolved m /I 0.01 0.28 0.05 0.08 H Potassium, dissolved m /I 7.6 8.5 8.1 10 Selenium, dissolved m /I -0.0050 0.0002 0.0007 -0.0005 U Selenium, total m /I Sodium Absorption Ratio SAR talc. 27.5 41.6 34.0 87.20 Sodium, dissolved m /I 657 992 794 1720 Sulfate m /l -10 400 62 -10 U TDS Ratio calc. 1.08 1.10 1.09 1.03 TDS Calc. m /I 1970 2070 2017 4230 TDS m /I 1920 2370 2117 4360 TSS rn /l Zinc, dissolved mg/I -0.02 2.33 0.32 0.11 B Baseline 2004. 2 ACZ Labs, Steamboat Springs, Colorado " Negative values denote readings below lab detection levels °Average (mean) value calc using 1/2 of detection limit for readings below lab detection limit unless 5 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL H - Holding time exceeded; pH is a field test with an immediate hold time. B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). G-27 West Elk Mine 2007 Annual Hydrology Report HydroGeo, Inc.