2010-06-30_REPORT - C1980007 (7)

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Well SOM-23-H-3 Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location: SOM-23-H-3 Baseline' 2009 Water Year Description Units Minimum Maximums Mean 5 5/8/2009 6/2/2009 8/10/2009 Q ° 8/10/2009 (Duplicate ) Q 4 Field Parameters Water Level Depth feet 180.59 186.50 183.86 215.6 216.1 218.1 218.1 Electrical Conductivity mhos/cm 1690 3210 2490 2040 1963 1948 1948 H SU 8.40 8.76 8.59 8.65 8.60 8.55 8.55 Temperature °C 10.2 10.2 10.0 10.0 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ ACZ Lab Reference # L77413-08 1 I L77413-01 Sample Date 8/10/2009 8/10/2009 Lab Test Date 8/11-8/24 8/11-8/24 Sampled B PH PH Alkalinity (Total CaC03) mg/I 937 1240 1144 1120 1150 Aluminum, dissolved m /I Ammonia m /I 0.03 0.09 0.05 0.03 B 0.03 B Anions me /I 19.3 23.9 22.8 22.5 23.0 Arsenic, dissolved m /I -0.001 -0.001 -0.001 -0.0005 U -0.0005 U Arsenic, total m /I Bicarbonate m /I 896 1100 1034 1010 1020 Boron, dissolved m /I 0.64 1.45 0.80 0.73 0.7 Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U -0.005 U Calcium, dissolved m /I 2.8 12.6 4.7 3.7 3.6 Carbonate m g/11 40 140 111 107 122 Cation - Anion Balance % -2.4 2.0 0.9 3.2 -1.8 Cations me /l 20.1 23.7 22.6 24.0 22.2 Chloride m /l 4 6 5 5 B 5 Conductivity mhos/cm 1560 2170 1945 1910 1880 Copper, dissolved m /I Hardness m /I 13 57 22 16 15 Hydroxide Mgt[ -2 -2 -2 -2 U -2 U Iron, dissolved m /l 0.12 10.70 2.63 0.57 0.32 Iron, total m /I 2.77 866' / 10:7" 149.07'/5.69" 13.50 12.30 Lead, dissolved m /l -0.0001 0.0046 -72.1652 0.0003 B 0.0002 B Magnesium, dissolved m /I 1.3 6.1 2.2 1.7 1.5 Manganese, dissolved m /l 0.019 0.310 0.077 0.034 0.031 Manganese, total m /I 0.040 1.79 0.349 0.085 0.081 Mercury, dissolved m /I -0.0002 0.0127 0.0019 -0.0002 U -0.0002 U Mercury, total m /l Molybdenum, dissolved m /I Nitrate as N dissoloved m /I -0.02 0.07 0.02 Nitrate/Nitrite as N m /I -0.02 0.07 0.03 -0.02 U -0.02 U Nitrite as N dissoloved m /I -0.01 -0.01 -0.01 Nitrogen, ammonia m g/1 0.59 1.27 0.74 0.57 0.59 H SU 8.4 8.9 8.7 8.7 H 8.7 H Phosphate m /I -0.03 0.24 0.08 0.15 0.15 Phosphorus Ortho , dissolved m /I -0.01 0.08 0.03 0.05 B 0.05 Potassium, dissolved m g/1 2.5 3.3 2.9 2.4 2.3 Selenium, dissolved m /I -0.001 0.002 0.001 -0.0001 U -0.0001 U Selenium, total m /I Sodium Absorption Ratio SAR calc. 25.1 61.4 53.0 58.30 56.10 Sodium, dissolved m /I 428 526 501 534 496 Sulfate m /I -10 20 7 -1 U -1 U TDS Ratio calc. 0.92 1.00 0.96 0.98 0.98 TDS Calc. m /I 1060 1310 1240 1260 1240 TDS m /l 970 1270 1197 1230 1210 TSS m /I Turbidity NTU 27.3 29.4 Zinc, dissolved mg/I -0.01 0.04 0.01 0.01 U 0.01 U ' Baseline 2005 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. 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). 5 Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. s Suspect data June 6 2005 for total iron; ' indicates data incl suspect data; •' indicates calc exlcuding suspect data. G-17 West Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.