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65 <br />Table 5.8 Summary of bedrock groundwater quality <br />Groundwater <br />Parameter <br />Units <br />Param <br />sort no. <br />Water Quality MCLs <br />Concentration Range <br />Low High <br />METALS <br />Arsenic <br />dissolved <br />mg /I <br />2 <br />0.01 Primary <br /><0.005 <0.005 <br />Cadmium <br />dissolved <br />mg /I <br />3 <br />0.005 Primary <br /><0.002 <0.002 <br />Iron <br />dissolved <br />mg /I <br />5.00 <br />0.30 Secondary <br /><0.05 1.52 <br />Lead <br />dissolved <br />mg /I <br />6 <br />0.015 Primary <br /><0.02 <0.02 <br />Manganese <br />dissolved <br />mg /I <br />6.50 <br />0.05 Secondary <br /><0.02 0.28 <br />Mercury <br />dissolved <br />mg /I <br />7 <br />0.002 Primary <br /><0.001 <0.001 <br />Selenium <br />dissolved <br />mg /I <br />9 <br />0.05 Primary <br /><0.005 <0.005 <br />Zinc <br />dissolved <br />mg /I <br />10.00 <br />5.00 Secondary <br /><0.01 9.23 <br />Calcium <br />total <br />mg /I <br />11 <br />9 168.00 <br />Magnesium <br />total <br />mg /I <br />12 <br />5.00 96.00 <br />Sodium <br />total <br />mg /I <br />13 <br /><5 317.00 <br />NON - METALS <br />Alkalinity Total (As CaCO3) <br />total <br />mg /I <br />32 <br />400 Secondary <br />347 700 <br />PH <br />S.U. <br />33.0 <br />7.6 8.3 <br />Sulfate <br />total <br />mg /I <br />34 <br />7 287 <br />Total Dissolved Solids <br />total <br />mg /I <br />34.5 <br />500 Secondary <br />510 1000 <br />Acidity Total (As CaCO3) <br />total <br />mg /I <br />37 <br /><5 <5 <br />Alkalinity Bicarbonate as HCO3 <br />total <br />mg /I <br />38 <br />400 Secondary -total Alk. as CaCO3 <br />424 837 <br />Alkalinity Carbonate as CO3 <br />total <br />mg /I <br />39 <br />400 Secondary-total Alk. as CaCO3 <br /><5 9 <br />Alkalinity Hydroxide as OH <br />total <br />mg /I <br />40 <br />400 Secondary-total Alk. as CaCO3 <br /><5 <5 <br />Chloride <br />total <br />mg /I <br />41.0 <br />250.0 Secondary <br />1.0 16.0 <br />Electrical Conductivity <br />total <br />US/cm <br />43 <br />770.0 1370 <br />Fluoride <br />total <br />mg /I <br />44.0 <br />4.0 Primary <br />0.2 4.5 <br />Hardness Calcium /Magnesium (As CaCO3) <br />total <br />mg /I <br />45 <br />40.0 773 <br />Nitrogen Nitrate (As N) <br />total <br />mg /I <br />10 Primary <br /><0.1 <0.1 <br />Nitrogen Nitrite (As N) <br />total <br />mg /I <br />1 Primary <br /><0.1 <0.1 <br />Nitrogen Nitrate - Nitrite (as N) <br />total <br />mg /I <br />1 Primary <br /><0.1 <0.1 <br />Phosphorus Orthophosphate as P <br />total <br />mg /I <br /><0.1 3 <br />FIELD PARAMETERS <br />pH Field <br />total <br />S.U. <br />6.5 -8.5 Secondary <br />6.8 8 <br />Electrical Conductivity <br />total <br />US/cm <br />Gpm <br />767.0 1689 <br />Temperature <br />total <br />°C <br />34.0 <br />7.0 15 <br />Dissolved Oxygen <br />total <br />m /I <br />34.50 <br />0.1 2 <br />NA = Not analyzed <br />Primary (MCL) and Secondary water quality standards are from EPA 816 -F -03 -013 (2003). <br />2572 -R2 Colowyo Coal Company <br />Water Management Consultants <br />