2010-12-17_REVISION - C1981019 (153)

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W 66 Groundwater Table 5.9 Summary of valley fill groundwater quality Parameter Units Param sort no. Water Quality MCLs Concentration range Low High METALS Arsenic dissolved mg /I 2 0.01 Primary <0.005 <0.005 Cadmium dissolved mg /I 3 0.005 Primary <0.002 <0.002 Iron dissolved mg /I 5.00 0.30 Secondary <0.05 11.10 Lead dissolved mg /I 6 0.015 Primary <0.02 <0.02 Manganese dissolved mg /I 6.50 0.05 Secondary <0.02 1.49 Mercury dissolved mg /I 7 0.002 Primary <0.001 <0.001 Selenium dissolved mg /I 9 0.05 Primary <0.005 0.021 Zinc dissolved mg /I 10 5 Secondary <0.01 <0.01 Calcium total mg /I 11 80 193 Magnesium total mg /I 12 32 170 Sodium total mg /I 13 8 119 NON - METALS Alkalinity, total as CaCO3 total mg /I 400 Secondary 235 604 pH, lab S.U. 7.6 8.1 Sulfate total mg /I 39 572 Total Dissolved Solids total mg /I 500 Secondary 420 1500 Acidity, total as CaCO3 total mg /I <5 <5 Alkalinity Bicarbonate as HCO3 total mg /I 400 Secondary -total Alk. as CaCO3 331 738 Alkalinity Carbonate as CO3 total mg /I 400 Secondary-total Alk. as CaCO3 <5 <5 Alkalinity Hydroxide as OH total mg /I 400 Secondary-total Alk. as CaCO3 <5 <5 Chloride total mg /I 250 Secondary 11 48 Electrical Conductivity, lab total us/cm 638 1820 Fluoride total mg /I 4.0 Primary 0.3 0.5 Hardness as CaCO3 total mg /I 330 1170 Nitrate as N total mg /I 10.0 Primary <0.1 18.6 Nitrite as N total mg /I 1 Primary <0.1 <0.1 Nitrate +Nitrite as N total mg /I 1 Primary <0.1 18.6 Phosphorus Orthophosphate as P total mg /I <0.1 0.2 FIELD PARAMETERS PH total S.U. 6.5 -8.5 Secondary 7.0 7.3 Electrical Conductivity us/cm 670 2010 Dissolved Oxygen total mg /I 0.4 2.7 Temperature total °C 4.9 11.9 Flow Rate total gpm 0.0 4.0 MCLs are Colorado Drinking Water Standards Primary (MCL) and Secondary water quality standards are from EPA 816 -F -03 -013 (2003). 2572 -R2 Colowyo Coal Company Water Management Consultants