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Upper Dry Fork Surtace Water duality and Field Parameters Mountain Coal West Elk Mine Monitoring Location Descri lion Field Parameters U. Dry Fork Flume Units Baseline Minimum Maximum Mean 2005 Water Year 5/5/2005 6/5/2005 10/2/2005 Flow Stall Gua a o.3z El6ctdCel COndUCIIVI UmhOS/Cm 236 348 130 H SU fi.96 7.07 7.37 Temperature (°C °C Tem efatufe °F) °F 42.6 53.3 54.5 COmmenl aubmer9etl submergetl New LOCaBOn Laborato Parameters' Name of Certified Lab ACZ Lab Reference # L515z5-os Sam le Dale 615/2005 Lab Test Date 618-6122 Sam led B Alkalini Total CaCO3 m A Aluminum, dissolved m /I 0.16 0.16 0.16 Anions me /I Arsenic, dissolved m /1 Arsenic, total m fl 0.002 0.002 0.002 Bicarbonate m /I 22 740 64 Boron, dissolved m A Cadmium, dissolved m /I Calcium, dissolved m /I 8.8 8.8 8.8 Carbonate m /I Cation -Anion Balance Cations me A Chloride m /I 49 7.3 Conductivi umhos/cm 43 877 t7s 256 Co er, dissolved m ~ Hardness m !I 19 98.5 48.7 H droxide m /I Iron, dissolved m /I 0,3 0.1 0.08 Iron, total m !I 0.17 27,2 3.92678471 7.09 Lead, dissolved m 11 Lead, total m ~ Ma nesium, dissolved m !I t.2 7.7 1.45 Man anese, dissolved m /I 0.014 0.024 0.018 Man anese, total m /I 0.004 0.45 0.078 Mercu ,dissolved m h Mol bdenum, dissolved m /I Nitrate as N ,dissolved m /I NitratelNitrite as N m /I O.o2 0.13 0.06 Nitrite as N ,dissolved m 11 H lab SU 6.1 8.2 7 4 8.2 Phos hate m /I Phos horns Onho ,dissolved m /I 3.19 0.27 Potassium, dissolved m /l Selenium, dissolved m /l Selenium, total m /l Sodium Abso lion Ratio SAR talc. 0.26 ua o.fis Sodium, dissolved m /I 6.5 6.5 6.5 Sulfate m 11 as t1 TDS Ratio calc. TDS Calc. m /l TDS m /l 30 454 106 170 TSS m 11 1.8 568 97 18 Zinc, dissolved m9/ •Baseline,WY 2000, and WY 2001 data ada ted from W WE. ACZ -ACZ Laboratories, Inc., Steamboat S rin s, CO Ne alive values denote readin s below lab detection levels NM -Not Measured West Elk Mine C-10 2005 Annual Hydrology Report HydroGeo, Inc.