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Lower Dry Fork Flume <br />Surface Water Quality and Field Parameters <br />• <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location: Lower Dry Fork Flume Baseline 2009 Water Year <br />Description Units Minimum Maximum Mean 5/812009 6/3/2009 Q ° 8/11/2010 <br />Field Parameters <br />Flow Staff Gauge or cfs 0.08' 0.47' 0.25' <br />Electrical Conductivity umhos/cm 1129 359 409 <br />H SU 8.41 8.67 8.50 <br />Temperature (C) C 16.4 15.3 17.8 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Lab ACZ <br />Lab Reference # L76236-08 <br />Sample Date 6/3/2009 <br />Lab Test Date 6/5-6/15 <br />Sampled B PH <br />Alkalinity (Total CaC03 m /I <br />Aluminum, dissolved m /I <br />Anions me /I <br />Arsenic, dissolved m /I <br />Arsenic, total m /I <br />Bicarbonate m /I 118 324 220 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I <br />Calcium, dissolved m /I 87.9 87.9 87.9 <br />Carbonate m /I <br />Cation -Anion Balance % <br />Cations meq/1 <br />Chloride m /I 8.4 4.2 <br />Conductivity umhos/cm 207 1920 755 333 <br />Copper, dissolved m /I <br />Hardness m /I 125 726 360 <br />Hydroxide m /I <br />Iron, dissolved m /I 0.178 0.049 0.09 <br />Iron, total m /I 0.02 84 5.6 1.74 <br />Lead, dissolved m /I <br />Lead, total m /I <br />Magnesium, dissolved m /l 9.8 49 29 <br />Manganese, dissolved m /l 0.008 0.013 0.011 <br />Manganese, total m /I 46.4 1.4 <br />Mercury, total m /l <br />Molybdenum, dissolved m /I <br />Nitrate as N), dissolved m /I <br />Nitrate/Nitrite (as N) m /I 0.1 0.3 0.2 <br />Nitrite as N), dissolved m /I <br />pH lab SU 6.9 9 8.2 8.7 H <br />Phosphate m /I <br />Phosphorus Ortho), dissolved m /I 0.763 0.048 <br />Potassium, dissolved m /I <br />Selenium, dissolved m /I <br />Selenium, total m /I <br />Sodium Absorption Ratio (SAR) calc. 0.71 1.48 1.11 <br />Sodium, dissolved m /I 69 69 69 <br />Sulfate m /I 35 613 249 <br />TDS Ratio calc. <br />TDS (Calc. m /I <br />TDS m /I 158 1388 581 210 <br />TSS m /I 1.2 1098 144 36 <br />Zinc, dissolved mg/I <br />Baseline and WY 2000 data adapted from WWE (2001). <br />2 ACZ Laboratory, Steamboat Springs, CO <br />3 Negative values denote readings below lab detection levels. <br />4 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL. <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). <br />West Elk Mine <br />C-8 2009 Annual Hydrology Report HydroGeo, Inc.