2010-06-30_REPORT - C1980007 (6)

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Box Canyon Surface Water Quality and Field Parameters • • C-17 Mountain Coal West Elk Mine Monitoring Location Box Canyon Baseline 2009 Water Year Description Units Minimum Maximum Mean 5/7/2009 5/24/2009 Q 8/10/2009 Field Parameters* Flow m 5.74 1.08 0.23 Electrical Conductivity umhos/cm 840 1020 916 984 1232 1370 H SU 7.9 8.9 8.3 8.58 8.69 8.81 Temperature (°C) C 2.0 15.9 10.0 7.0 12.5 15.0 Comment Laboratory Parameters Name of Certified Lab ACZ Lab Reference # L76064-09 Sample Date 5/24/2009 Lab Test Date 5129-6/5 Sampled B PH Alkalinity Total CaC03 m /I 401 447 '- 427 Aluminum, dissolved m /I Aluminum, total m /I 0 0.07 0.03 Anions me /I 10.3 12.1 11.1 Arsenic, dissolved m /I 0 0 0 Arsenic, total m /I 0 0.006 0.001 Bicarbonate m /I 398 447 425 Boron, dissolved m /I Cadmium, total m /I 0 0.003 0.0008 Calcium, dissolved m /I 40.2 67.9 58.0 Carbonate m /I 0 12 2 Cation -Anion Balance % -4 3.6 0.02 Cations me /I 9.5 12.23 11.1 Chloride m /I 2 6 5 Conductivity umhos/cm 86B 968 921 1190 Copper, dissolved m /I Hardness m /I 195 283 255 Hydroxide m /I 0 0 0 Iron, dissolved m /I 0 0.02 0.01 0.03 B Iron, total m /I 0.02 0.44 0.16 0.71 Lead, dissolved m /I Lead, total m /I Magnesium, dissolved m /I 23 28 27 Manganese, dissolved m /I Manganese, total m /I 0 0.009 0.002 Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N), dissolved m /I 0.13 0.48 0.30 Nitrate/Nitrite as N m /I 0.13 0.48 0.30 Nitrite as N), dissolved m /I H lab SU 8 8.2 8.1 8.8 H Phosphate m /I 0 0.03 0,01 Phosphorus Ortho , dissolved m /I 0 0.007 0.002 Potassium, dissolved m /I 2.6 3.3 3.0 Selenium, dissolved m /I 0.001 0.002 0.002 Selenium, total m /I o 0.003 0.001 Sodium Absorption Ratio SAR calc. 3.43 4.26 3.91 Sodium, dissolved m /I 127 154 141 Sulfate m /I 100 140 118 TDS Ratio calc. TDS Calc. m /I TDS m /I 540 620 586 770 TSS m /I 0 38 191 1 11 B Zinc, dissolved mg/I 0 0.01 0.002 1 Baseline and WY 2000 data adapted from WWE (2001). Shaded cells indicate value different from AHR 2000 baseline value due to rounding. 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. 4 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 2009 Annual Hydrology Report HydroGeo, Inc.