2008-06-27_REPORT - C1980007 (5)

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East Gulch, East of Horse Gulch Surface Water Quality and Field Parameters 0 Mountain Coal West Elk Mine Monitoring Location E. Gulch, E. of Horse Gulch Baseline' 2007 Water Year Description Units Minimum Maximum Mean 4/27/2007 5/30/2007 8/24/2007 Field Parameters D D D Flow m Electrical Conductivity umhos/cm 260 480 402 H SU 7.7 8.4 8.0 Temperature (°C) °C 4.8 14.8 10.0 Temperature (°F OF 40.6 58.6 50.0 Comment Laboratory Parameters 3 Name of Certified Lab Lab Reference # Sample Date Lab Test Date Sampled B Alkalinity Total CaCC3 m q/1 135 245 202 Aluminum, dissolved m /I 0.03 0.03 0.03 Anions me /I 4.9 4.9 4.9 Arsenic, dissolved m /I Arsenic, total m q/1 Bicarbonate mg/ I 135 245 202 Boron, dissolved m /I Cadmium, dissolved m /I Calcium, dissolved m q/1 26.8 53.6 42.6 Carbonate m /I 6 0.5 Cation - Anion Balance Cations me /1 4.9 4.9 4.9 Chloride m q/1 1 4 2 Conductivit umhos/cm 453 453 453 Copper, dissolved m /I Hardness m /I 95 190 156 Hydroxide m /I dissolved Iron m q/1 0.05 0.05 0.05 , Iron, total m /I 0.41 3.59 1.07 Lead, dissolved m /l Lead, total m /I Magnesium, dissolved m /I 6.9 13.7 11.6 Manganese, dissolved m /I 0.012 0.012 0.012 Manganese, total m /I 0.01 0.094 0.068 Mercury, total m /I Molybdenum, dissolved m /l Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I 0.04 0.23 0.13 dissolved Nitrite as N) m /I , H l b SU 8 8 8 a Phosphate m /I 0.2 0.2 0.2 Phosphorus Ortho , dissolved m /I 0.066 0.018 Potassium, dissolved m /I 1.8 1.8 1.8 Selenium, dissolved m /I Selenium, total m /I calc 0.94 Sodium Absorption Ratio SAR . q Sodium, dissolved m /I 20.9 47.8 E40. fate Sul m /I TDS Ratio calc. TDS Calc. m /I m /I 170 290 252 TDS TSS m /I 50 17 Zinc, dissolved mg/I Baseline and WY 2000 data adapted from WWE (2001). 2 ACZ Laboratory, Steamboat Springs, CO Negative values denote readings below lab detection levels West Elk Mine HydroGeo, Inc. C-14 2007 Annual Hydrology Report