2010-06-30_REPORT - C1980007 (6)

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Upper Sylvester Gulch Surface Water Quality and Field Parameters • • C-3 Mountain Coal West Elk Mine Monitoring Location U. Sylvester Gulch Flume Baseline' 2009 Water Year Description Units Minimum Maximum Mean 5/7/2009 5/24/2009 Q ° 8/10/2009 Field Parameters Flow staff ua a/cfs 0.26 0.64 0.45 0.24' staff 0.15' staff Dry Electrical Conductivity umhos/cm 300 380 340 579 578 H SU 8.1 8.3 8.2 8.32 8.37 Temperature °C °C 8.4 9.5 9.0 6.6 10.9 Comment Laboratory Parameters 3 Name of Certified Lab ACZ Lab Reference # L76064-04 Sam le Date 5/24/2009 Lab Test Date 5/25-6/5 Sampled B PH Alkalinity Total CaC03 m /I 212 212 212 Aluminum, dissolved m /I 0.03 0.03 0.03 Anions me /I 5.1 5.1 5.1 Arsenic, dissolved m /I Arsenic, total m /I Bicarbonate m /I 204 204 204 Boron, dissolved m /I Cadmium, dissolved m /I 0.003 0.003 0.003 Calcium, dissolved m /I 35.1 35.1 35.1 Carbonate m /l 8 8 8 Cation - Anion Balance % -4.1 -4.1 -4.1 1 1 Cations me /I 4.7 4.7 4.7 Chloride m /I 2 2 2 Conductivity urnhos/cm 462 462 462 557 Copper, dissolved m /I 0.01 0.01 0.01 Hardness m /I 124 124 124 Hydroxide m /I 2 2 2 Iron, dissolved m /I 0.01 0.01 0.01 0.02 B Iron, total m /I 0.07 0.07 0.07 0.381 1 Lead, dissolved m /I 0.04 0.04 0.04 Lead, total m /I Magnesium, dissolved m /I 8.8 8.8 8.8 Manganese, dissolved m /I 0.005 0.005 0.005 Manganese, total m /I 0.005 0.005 0.005 Mercury, total m /I 0.0002 0.0002 0.0002 Molybdenum, dissolved m /I 0.01 0.01 0.01 Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I Nitrite as N), dissolved m /I H lab SU 8.7 H Phosphate m /I 0.03 0.03 0.03 Phosphorus Ortho , dissolved m /I 0.005 0.005 0.005 Potassium, dissolved m /I 1.4 1.4 1.4 Selenium, dissolved m /I Selenium, total m /I 0.04 0.04 0.04 Sodium Absorption Ratio SAR calc. 2.03 2.03 2.03 Sodium, dissolved mg/1 51.4 51.4 51.4 Sulfate m /I 40 40 40 TDS Ratio calc. TDS Calc. m /I TDS m /I 250 260 255 340 TSS m /I 1 s 20 14 7 B Zinc, dissolved mg/I 0.01 0.01 0.01 ' Baseline and WY 2000 data adapted from WWE (2001). 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). Welst Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.