2008-06-27_REPORT - C1980007 (7)

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Upper Dry Fork Alluvial Water Onality and Field Parameters C] f1 u • Mountain Coal West Elk Mine Monitoring Location: Upper Dry Fork Alluvial Well Baseline' 2007 Water Year Description Units Minimum Maximum Mean 4/28/2007 5/25/2007 8/23/2007 Q Field Parameters Water Level Depth feet 13.7 13.6 15.5 Electrical Conductivity µmhos/cm 604 598 604 H SU 6.45 7.45 7.31 Temperature OF 51.3 49.6 47.8 Temperature °C 10.7 9.8 8.8 Comment Laboratory Parameters 3 Name of Certified Lab z ACZ" Lab Reference # L64613-02 Sample Date 8/23/2007 Lab Test Date 8/24-9/13 Sampled B Alkalinity (Total CaC03) mg/1 227 266 248 252 Aluminum, dissolved m /I Ammonia m /I -0.01 U Anions me /I 5.6 6.2 5.8 6.0 Arsenic, dissolved m /I -0.0005, 0.0006 0.0002 .0039 Arsenic, total m q/1 Bicarbonate m /I 227 266 248 252 Boron, dissolved m /I .05 Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m g/1 3.2 5.1 3.7 4.3 Carbonate m /I -2 -2 -2 -2 U Cation - Anion Balance % 0.9 3.9 1.9 0.8 Cations me /I 5.7 6.7 6.0 6.1 Chloride m g/1 -1 6 4 6 Conductivity µmhos/cm 493 509 503 577 Copper, dissolved m /I Hardness m /I 10 16 12 13 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m g/1 0.03 0.49 0.19 0.25 Iron, total m g/1 1.3 25.9 13.6 2.84 Lead, dissolved m /I -0.04 -0.04 -0.04 0.0005 Magnesium, dissolved m /I -0.2 0.7 0.4 0.6 B Manganese, dissolved m /I 0.067 0.101 0.081 0.081 Manganese, total m /I 0.109 0.349 0.229 0.188 Mercury, dissolved m /I -0.0002 0.0015 0.0002 -0.0002 U Mercury, total m /I Molybdenum, dissolved m q/1 Nitrate as N dissoloved m /I 0.05 B Nitrate/Nitrite as N m /I 0.04 0.87 0.16 0.05 B Nitrite as N dissoloved m /I -0.01 U Nitrogen, ammonia m /I -0.05 0.20 0.10 -0.05 U H SU 8.0 8.1 8.0 8.2 H Phosphate m /I 0.1 0.4 0.2 0.24 Phosphorus Ortho , dissolved m /I 0.03 0.13 0.06 0.08 Potassium, dissolved m /I 0.9 2.7 1.8 1.1 B Selenium, dissolved m /I -0.0010 0.0003 0.0003 -0.0001 U Selenium, total m /I Sodium Absorption Ratio SAR calc. 16 17 17 16 Sodium, dissolved m g/1 113 144 126 132 Sulfate m q/1 30 50 35 40 B TDS Ratio calc. 1 1 1 0.98 TDS Calc. m /I 313 313 313 336 TDS m g/1 290 390 326 330 TSS m /I Zinc, dissolved mg/I -0.01 0.04 0.02 0.02 B Baseline 2004 2 ACZ Labs, Steamboat Springs, Colorado ' Negative values denote readings below lab detection levels 4Average (mean) value calc using 1/2 of detection limit for readings below lab detection limit unless all re 5 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). G-7 West Elk Mine 2007 Annual Hydrology Report HydroGeo, Inc.