2008-06-27_REPORT - C1980007 (7)

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Well 03-11-01 Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location Well 3-11-01 Baseline' 2007 Water Year Description Units Minimum Maximum _Mean 4 4/26/2007 5/23/2007 8/22/2007 Q' 10/16/2007 Q' Field Parameters Water Level Depth feet 162.6 162.5 162.5 163.0 Electrical Conductivity µmhos/cm 1702 3160 Soso 3010 H SU 7.30 7.71 7.49 7.20 Temperature F 62.4 55.9 55.0 53.1 Temperature °C 13.3 12.8 11.7 Comment Baseline 10/03 to 9/04 Holding time Retest Laboratory ParameterS3 Name of Certified Lab ACZ ACZ Lab Reference # L64626-01 L65714-01 Sample Date 8/22/2007 10/16/200 Lab Test Date 8/24-9/13 10/17-11/4 Sampled B Alkalinity (Total CaCQ) mg/I 1620 1950 1802 1710 1690 Aluminum, dissolved m /I Ammonia m /I -0.0t U -0.01 U Anions me /I 35 36 35 36.2 35.9 Arsenic, dissolved m /I -0.0030 0.0010 -0.0007 -0.001 U 0.0005 B Arsenic, total m /I Bicarbonate m /I 1620 1950 1802 1660 1650 Boron, dissolved m /I 1.49 1.56 Cadmium, dissolved m /I -0.010 -0.005 -0.008 -0.005 U -0.005 U Calcium, dissolved m /I 5.3 12.5 8.1 5.6 5.1 Carbonate m /I -2 -2 -2 50 44 Cation - Anion Balance % -3.8 -2.5 -3.2 -2.1 4.4 Cations me /l 33.0 33.4 33.2 34.7 39.2 Chloride m /l 66 177 89 72 73 Conductivity µmhos/cm 2660 2730 2695 3070 3050 Copper, dissolved m /I Hardness m /I 35 38 37 20 18 Hydroxide m /I -2 -2 -2 -2 U -2 U Iron, dissolved m /I 0.02 0.82 0.31 0.28 0.08 Iron, total m /I 0.30 0.49 0.40 3.24 2.32 Lead, dissolved m /I 0.0004 B -0.0001 U Magnesium, dissolved m /l 1.2 3.0 1.6 1.4 1.3 Manganese, dissolved m /I 0.03 0.14 0.07 0.021 B 0.014 B Manganese, total m /I 0.14 0.15 0.15 0.04 B 0.05 B Mercury, dissolved m /I -0.0002 0.0006 0.0002 -0.0002 U -0.0002 B Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N m q/1 0.03 0.21 0.10 -0.02 U 0.18 Nitrate/Nitrite as N m /I -0.02 0.21 0.07 -0.02 U,H 0.18 Nitrite as N m /I 0.06 0.06 0.06 -0.o1 U,H -0.01 U Nitrogen, ammonia m /I 0.73 0.92 0.82 0.60 0.25 B H lab SU 8.1 8.3 8.2 8.4 H 8.4 H Phosphate m /I -0.03 0.09 0.01 0.09 B 0.15 Phosphorus Ortho , dissolved m /I -0.01 0.03 -0.01 0.03 B,H o.o5 B Potassium, dissolved m /I 4.0 4.1 4.1 3.8 4.1 Selenium, dissolved m /I -0.0050 0.0030 -0.0010 -0.0002 U -0.0001 U Selenium, total m /I Sodium Absorption Ratio SAR calc. 52.6 54.5 53.6 76.90 91.00 Sodium, dissolved m /I 723 1780 878 777 879 Sulfate m /I -10 40 1 -10 U -10 U TDS Ratio calc. 0.99 0.96 TDS Calc. m /I 1910 2000 TDS m /I 1850 2130 2044 1900 1910 TSS m /I Zinc, dissolved mg/I -0.02 0.21 0.05 -0.01 U o.o1 B Baseline 2004 2 ACZ Labs, Steamboat Springs, Colorado 3 Negative values denote readings below lab detection levels 4Average (mean) value calc using 1/2 of detection limit for readings below lab detection limit unless; e ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL H -Holding time exceeded; pH is afield test with an immediate hold time. B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). G-19 West Elk Mine 2007 Annual Hydrology Report HydroGeo, Inc.