2008-06-27_REPORT - C1980007 (6)

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Spring 35-3 Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location: Spring 35-3 Baseline' 2007 Water Year Description Units Minimum Maximum Mean 4 4/28/2007 5/29/2007 Q 5 9/11/2007 Field Parameters Flow m 0.63 26.5 6.3 7.89 4.6 1.13 Electrical Conductivity µmhos/cm 223 560 427.5 278 340 450 H SU 6.53 8.74 7.5 7.69 7.58 7.65 Temperature OF 42.6 53.8 48.1 42.6 43.7 45.3 Temperature OC 5.9 6.5 7.4 Comment Laboratory Parameters' Name of Certified Lab ACZ Lab Reference # L62928-04 Sample Date 39231 Lab Test Date 5/31-6/18 Sampled B Alkalinity (Total CaC03) mg/l 102 217 170 127.0 Aluminum, dissolved m /l -0.03 0.09 0.04 0.0 U Aluminum, total m /l Anions me /l 2.5 4.8 3.9 3.0 Arsenic, dissolved m g/1 Arsenic, total m g/1 0.0009 0.0130 0.0039 0.0 Bicarbonate M g/1 102 212 169 127.0 Boron, dissolved m g/1 -0.01 -0.01 -0.01 0.01 B Cadmium, dissolved m /l -0.005 -0.005 -0.005 -0.005 U Calcium, total M g/1 Calcium, dissolved M g/1 18.2 47.2 34.3 28.4 Carbonate m /I -2 4 2 -2 U Cation - Anion Balance % -8.6 -2.1 -4.4 1.6 Cations me /I 2.3 4.6 3.6 3.1 Chloride m /l 1 11 3 2 B Conductivity µmhos/cm 216 451 351 302 Copper, dissolved m /l -0.01 -0.01 -0.01 -0.01 U Hardness m g/1 59 142 105 89 Hydroxide m g/1 -2 -2 -2 -2 U Iron, dissolved m g/1 -0.02 0.12 0.06 0.12 Iron, total m /l 0.19 42.50 9.14 2.1 Lead, dissolved M g/1 -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 3.3 5.8 4.8 4.4 Manganese, dissolved M g/1 -0.005 0.272 0.055 -0.005 U Manganese, total m /l 0.021 1.280 0.325 0.08 Mercury, total m /I -0.0002 0.0003 0.0001 -0.0002 U Molybdenum, dissolved m /l -0.01 -0.01 -0.01 -0.01 U Nitrate as N m /I Nitrate/Nitrite as N m g/1 -0.02 0.17 0.08 0.06 B Nitrite as N M g/1 H Lab SU 7.8 8.3 8.2 7.9 H Phosphate M g/1 -0.03 0.15 0.07 0.03 B Phosphorus Ortho , dissolved - m /l -0.01 0.05 0.02 0.01 H,B Potassium, dissolved M g/1 0.7 1.4 0.9 0.9 B Selenium, dissolved m /l Selenium, total recoverable m /l -0.001 -0.001 -0.001 -0.001 U Sodium Absorption Ratio SAR talc. 1.27. 1.60 1.45 1.37 Sodium, dissolved m /l 25.7 42.5 33.4 29.3 Sulfate m /l 10 30 20 20 B TDS Ratio calc. 0.09 1.22 0.93 1.24 TDS Ca1c. m /l 131 248 199 161 TDS m g/1 160 250 210 200 TSS m g/1 -5 510 133 -5 U Zinc, dissolved m /l -0.01 0.02 0.01 -0.01 U Zinc, total mg/l Baseline 2006 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels 4 Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit 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). West Elk Mine E-29 2007 Annual Hydrology Report HydroGeo, Inc.