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Table: 9a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 97013TM Bedrock Well, Twentymile Sandstone Datum: 6672.27 <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 />10/15/1998 9/11/2017 <br />18 <br />9.642 <br />9.58 <br />10.89 <br />8.79 <br />0.512 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />10/15/1998 9/11/2017 <br />18 <br />1270 <br />1230 <br />1650 <br />1120 <br />139 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />10/15/1998 9/11/2017 <br />18 <br />10.6 <br />11 <br />14.2 <br />6.1 <br />1.74 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />10/15/1998.4/14/2017 <br />26 <br />9.58 <br />9.5 <br />10.8 <br />9.27 <br />0.346 <br />PHYSICAL <br />Specific Conductivity,Lab <br />N <br />UMHOS/CM <br />10/15/1998 4/14/2017 <br />26 <br />1185 <br />1184 <br />1610 <br />933 <br />152 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />10/15/1998 4/14/2017 <br />26 <br />697 <br />689 <br />960 <br />540 <br />91.5 <br />CATION <br />Calcium <br />D <br />MG/L <br />10/15/1998 4/14/2017 <br />26 <br />1.63 <br />1.16 <br />6.3 <br />0.24 <br />1.28 <br />CATION <br />Magnesium <br />D <br />MG/L <br />10/15/1998 4/14/2017 <br />26 <br />0.451 <br />0.4 <br />1.2 <br />0.01 <br />0.3 <br />CATION <br />Sodium <br />D <br />MG/L <br />10/15/1998 4/14/2017 <br />26 <br />253 <br />251 <br />334 <br />71 <br />50.9 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />10/15/1998 4/14/2017 <br />26 <br />324 <br />351 <br />460 <br />2 <br />110 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />10/15/1998 4/14/2017 <br />26 <br />85.6 <br />85.5 <br />162 <br />2 <br />31.6 <br />ANION <br />Sulfates <br />N <br />MG/L <br />10/15/1998 4/14/2017 <br />26 <br />173 <br />140 <br />490 <br />60 <br />96.2 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />10/15/1998 4/14/2017 <br />26 <br />2 <br />0.5 <br />5 <br />0.4 <br />2 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />10/15/1998 4/14/2017 <br />26 <br />100 <br />50 <br />200 <br />40 <br />80 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />10/15/1998 4/14/2017 <br />26 <br />0.5 <br />0.2 <br />1 <br />0.2 <br />0.4 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />10/15/1998 4/14/2017 <br />26 <br />2.5 <br />1 <br />17 <br />0.2 <br />4.2 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />10/15/1998 4/14/2017 <br />26 <br />1501 <br />96 <br />720 <br />30 <br />160 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />10/15/1998 4/14/2017 <br />26 <br />10 <br />5 <br />30 <br />5 <br />10 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />10/15/1998 4/14/2017 <br />26 <br />50 <br />50 <br />100 <br />10 <br />30 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />10/15/1998 4/14/2017 <br />26 <br />0.05 <br />0.03 <br />0.1 <br />0.02 <br />0.04 <br />NUTRIENT <br />Phosphorus, Ortho hos horus <br />IN <br />MG/L <br />110/15/199814/14/20171 <br />251 <br />0.0894 <br />0.061 <br />0.2941 <br />0.02 <br />0.0708 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables97013TM <br />