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Table: 16 <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 91M004 Bedrock Well, Fish Creek Sandstone Datum: 7036.79 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count Average <br />Median Maximum Minimum STDEV <br />FIELD <br />pH, Field <br />N <br />S.U. <br />12/30/1992 11/2/1999 <br />27 <br />7.57 <br />7.56 <br />8.6 <br />6.69 <br />0.372 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />12/30/1992 11/2/1999 <br />27 <br />700 <br />700 <br />950 <br />510 <br />100 <br />FIELD <br />Temperature Field <br />N <br />DEG -C <br />12/30/1992 11/2/1999 <br />27 <br />11.9 <br />10.2 <br />54 <br />5 <br />8.75 <br />PHYSICAL <br />S ecific Conductivi Lab <br />N <br />UMHOS/CM <br />12/30/1992 4/30/1996 <br />14 <br />702 <br />692 <br />833 <br />568 <br />87.8 <br />PHYSICAL <br />Total Dissolved Solids Lab <br />N <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />431 <br />407 <br />690 <br />324 <br />99.6 <br />CATION <br />Calcium <br />D <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />93.8 <br />91.5 <br />113 <br />77 <br />11.6 <br />CATION <br />Magnesium <br />D <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />32.2 <br />32.7 <br />38.3 <br />26 <br />3.61 <br />CATION <br />Sodium <br />D <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />17 <br />14.1 <br />63.7 <br />9 <br />14 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />3/30/1993 4/30/1996 <br />13 <br />499.3 <br />434 <br />805 <br />393.6 <br />145.5 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />3/30/1993 4/30/1996 <br />13 <br />0.81 <br />0 <br />2 <br />0 <br />1 <br />ANION <br />Sulfates <br />N <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />64 <br />47 <br />220 <br />14 <br />56 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />12/30/1992,4/30/1996 <br />14 <br />0.2 <br />0.2 <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 />0.5 <br />0.1 <br />0.1 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />12/30/1992 4/30/1996 <br />14 <br />4.11 <br />1 <br />18 <br />1 <br />5.5 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />12/30/1992 4/30/1996 <br />14 <br />911 <br />70 <br />350 <br />20 <br />94 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />12/30/1992 4/30/1996 <br />14 <br />190 <br />190 <br />520 <br />13 <br />150 <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 />0.552 <br />0.07 <br />2.78 <br />0.02 <br />0.957 <br />NUTRIENT <br />Phosphorus, Ortho hos horus <br />N <br />MG/L <br />12/30/1992 4/30/1996 <br />14 <br />0.0089 <br />0.0065 <br />0.025 <br />0.005 <br />0.0059 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables91M004 <br />