2010-06-30_REPORT - C1980007 (7)

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96-2-2 Area Spring Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location 96-2-2 Area Spring Baseline' 2009 Water Year Description Units Minimum Maximum Mean a 5/9/2009 614/2009 Q ° 8/9/2009 Field Parameters Flow m 0.11 2.5 0.75 2.76 1.35 Trickle Electrical Conductivity umhos/cm 348 430 399 290 357 513 H SU 7.78 8.18 7.88 7.67 7.73 8.19 Temperature C 6.9 12.3 10.6 5.4 6.0 10.8 Comment Laboratory Parameters 3 Name of Certified Lab ACZ Lab Reference # L76236-14 Sample Date 6/4/2009 Lab Test Date 6/5-6/17 Sampled B PH Alkalinity (Total CaC03 m /I 129 172 156 144 , Aluminum, dissolved m /I -0.03 0.21 0.09 -0.03 U Anions me /I 3.2 4 3.8 Arsenic, dissolved m /I 3.5 Arsenic, total m /I -0.0005 0.0012 0.0007 -0.0005 U Bicarbonate m /I 129 171 154 144 Boron, dissolved m /I 0.01 0.02 0.02 0.02 B Cadmium, dissolved m /I -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m /I 11.8 18.3 16.2 13.6 Carbonate m /I -2 10 a -2 U Cation-Anion Balance % 0.0 5.6 2.2 0 Cations me /I 3.3 4.3 4.0 3.5 Chloride m /I 2 3 2 2 B Conductivity umhos/cm 332 421 387 327 Copper, dissolved m /I -0.01 -0.01 -0.01 -0.01 U Hardness m /I 38 59 52 44 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 0.05 0.30 0.13 0.02 B Iron, total m /I 0.84 9.08 4.55 1.78 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 2.1 3.3 2.9 2.4 Manganese, dissolved m /I -0.005 0.177 0.045 -0.005 U Manganese, total m /I 0.013 0.153 0.075 0.025 B Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U Molybdenum, dissolved m /I -0.01 0.01 0.01 -0.01 U Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I -0.02 0.04 0.03 0.03 B Nitrite as N), dissolved m /I H SU 8.2 8.5 8.4 8.2 H Phosphate m /I 0.03 0.18 0.08 -0.03 U Phosphorus Ortho , dissolved m /I 0.01 0.06 0.03 -0.01 U Potassium, dissolved m /I 0.7 1.4 1.2 0.6 B Selenium, total m /I -0.001 0.002 0.0008 0.0003 B Sodium Absorption Ratio SAR talc. 3.93 4.17 4.09 4.05 Sodium, dissolved m /I 58.5 70.8 67.0 60.9 Sulfate m /I 30 30 30 29 TDS Ratio talc. 0.97 1.04 1.02 1.03 TDS Calc. m /I 183 231 216 195 TDS m /I 190 240 220 200 TSS m /1 22 510 175 311 1 Zinc, dissolved mg/I -0.01 0.11 0.03 0.01 U Baseline 2007 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). 5 Avera a mean value talc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. West Elk Mine E-36 2009 Annual Hydrology Report HydroGeo, Inc-