2010-06-30_REPORT - C1980007 (6)

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Lower Raven Gulch Surface Water Quality and Field Parameters Mountain Coal We • Monitoring Location Description Field Parameters* Flow Electrical Conductiv H Temperature (OC) Comment Laboratory Param Name of Certified L Lab Reference # • L. Raven Gulch Baseline' 2009 Water Year Units Minimum Maximum Mean 5 5/6/2009 5/26/2009 Q 4 5/26/2009 (Duplicate) Q 4 8/8/2009 rp 30510 6950 6950 165 mhos/cm 151 231 231 464 SU 8.01 8.43 8.43 8.68 °( 9.5 9.6 9.6 17.1 L76041-04 L76041-01 5/26/2009 5/26/2009 5/27-6/9 5/27-6/9 PH PH 101 97 Aluminum, dissolved m /I -0.03 0.05 0.01 -0.03 U -0.03 u Anions me /I 1.6 1.7 1.7 2.4 2.4 Arsenic, dissolved m /I Arsenic, total m /I 0.0009 0.0012 0.0011 0.0013 B 0.0013 B Bicarbonate m /I 58 76 67 97 92 Boron, dissolved m /I -0.01 -0.01 -0.01 -0.01 U -0.01 U Cadmium, dissolved m g/1 -0.005 -0.005 -0.005 -0.005 U -0.005 U Calcium, dissolved m g/1 15 20 18 23.2 22.9 Carbonate m /I -2 -2 -2 4 B 5 B Cation - Anion Balance m /I 0.0 2.9 1.5 -2.1 -2.1 Cations me /I 2 2 2 2.3 2.3 Chloride m /I -1 1 0 1 B 2 BI I Conductivity mhos/cm 145 170 158 218 219 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U -0.01 u Hardness m /I 51 64 58 76 75 Hydroxide m /I -2 -2 -2 -2 U -2 U Iron, dissolved m /I 0.05 0.10 0.08 0.05 0.07 Iron, total m /I 7.88 9.04 8.46 12.3 12.6 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U -0.04 U Magnesium, dissolved m /I 3.0 3.5 3.3 4.3 4.2 Manganese, dissolved m /I -0.005 0.006 0.001 -0.005 U -0.005 U Manganese, total m g/1 0.168 0.192 0.180 0.224 0.222 Mercury, total m g/1 -0.0002 -0.0002 -0.0002 -0.0002 U -0.0002 U Molybdenum, dissolved m /I -0.01 -0.01 -0.01 -0.01 U -0.01 U Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I -0.02 0.02 0.00 0.05 B 0.02 B Nitrite as N), dissolved m /I H SU 7.8 8.3 8.1 8.5 H 8.5 H Phosphate m /I 0.09 0.18 0.14 0.03 B 0.06 B Phosphorus Ortho , dissolved m /I 0.03 0.06 0.05 0.01 B 0.02 B Potassium, dissolved m /l 0.9 1.1 1.0 1.2 B 1.1 B Selenium, total m /I -0.001 -0.001 -0.001 0.0004 B 0.0005 B Sodium Absorption Ratio SAR calc. 0.65 0.81 0.73 0.92 0.92 Sodium, dissolved m /I 11.8 13.2 12.5 18.2 18.1 Sulfate m g/1 10 20 15 17 20 TDS Ratio calc. 1.24 1.30 1.27 1.10 1.16 TDS Cale. m /I 89 92 91 127 129 n TDS m /I 110 120 115 140 150 TSS m /I 186 296 241 480 366 Zinc, dissolved mg/I -0.01 -0.01 -0.01 -0.01 U -0.01 u 1 Baseline 2005 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. ° 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). e Average (mean) value calc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. • C-19 West Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.