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Table: 15 <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 91M001 Bedrock Well, Fish Creek Sandstone Datum: 6986.9 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count Average <br />Median Maximum <br />Minimum <br />STDEV <br />FIELD <br />pH, Field <br />N <br />S.U. <br />12/30/1992 11/2/1999 <br />27 <br />7.67 <br />7.67 <br />8.4 <br />6.86 <br />0.366 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />12/30/1992 11/2/1999 <br />27 <br />640 <br />640 <br />860 <br />490 <br />71 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />12/30/1992 11/2/1999 <br />27 <br />11.3 <br />9.6 <br />56 <br />5 <br />9.2 <br />PHYSICAL <br />Specific Conductivity,Lab <br />N <br />UMHOS/CM <br />12/30/1992 4/30/19961 <br />14 <br />6421 <br />676 <br />755 <br />345 <br />107 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />370 <br />375 <br />452 <br />278 <br />48.4 <br />CATION <br />Calcium <br />D <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />80.4 <br />82.5 <br />103 <br />54 <br />17.6 <br />CATION <br />Magnesium <br />D <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />35.8 <br />36.5 <br />42.1 <br />28 <br />5.67 <br />CATION <br />Sodium <br />D <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />16 <br />15.1 <br />23 <br />11.7 <br />3.43 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />3/31/1993 4/30/1996 <br />13 <br />414.9 <br />439.2 <br />531 <br />310 <br />74.27 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />3/31/1993 4/30/1996 <br />13 <br />1 <br />0 <br />5 <br />0 <br />2 <br />ANION <br />Sulfates <br />N <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />38.1 <br />23.5 <br />134 <br />6 <br />35.7 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />12/30/1992 4/30/1996 <br />14 <br />0.3 <br />0.21 <br />0.5 <br />0.1 <br />0.2 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />12/30/1992 4/30/1996 <br />14 <br />20 <br />20 <br />40 <br />20 <br />5 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />12/30/1992 4/30/1996 <br />14 <br />0.2 <br />0.2 <br />0.2 <br />0.1 <br />0.04 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />12/30/1992 4/30/1996 <br />14 <br />1 <br />1 <br />1 <br />1 <br />0 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />12/30/1992 4/30/1996 <br />14 <br />56 <br />45 <br />160 <br />20 <br />47 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />12/30/1992 4/30/1996 <br />14 <br />47 <br />27 <br />270 <br />10 <br />68 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />12/30/1992 4/30/1996 <br />14 <br />20 <br />10 <br />50 <br />10 <br />10 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />0.559 <br />0.09 <br />2.41 <br />0.02 <br />0.838 <br />NUTRIENT <br />Phosphorus, Ortho hos horus <br />N <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />0.0264 <br />0.005 <br />0.131 <br />0.005 <br />0.0402 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables91M001 <br />