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Table: 10a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 0183106 (001-83-106, Bedrock Well, Trout Creek Sandstone) Datum: 6892.7 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count Average <br />Median Maximum <br />Minimum <br />STDE <br />FIELD <br />H Field <br />N <br />S.U. <br />4/12/2017 4/12/2017 <br />1 <br />8.51 <br />8.51 <br />8.51 <br />8.51 <br />0 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />4/12/2017 4/12/2017 <br />1 <br />1450 <br />1450 <br />1450 <br />1450 <br />0 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />4/12/2017 4/12/2017 <br />1 <br />13.8 <br />13.8 <br />13.8 <br />13.8 <br />0 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />4/17/2007 4/12/2017 <br />6 <br />8.8 <br />8.8 <br />91 <br />8.6 <br />0.14 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />4/17/2007 4/12/2017 <br />6 <br />1370 <br />1380 <br />1420 <br />1260 <br />57.4 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />4/17/2007 4/12/2017 <br />6 <br />861 <br />855 <br />920 <br />820 <br />33.6 <br />CATION <br />Calcium <br />D <br />MG/L <br />4/17/2007 4/12/2017 <br />6 <br />2 <br />1.9 <br />2.8 <br />1.6 <br />0.47 <br />CATION <br />Magnesium <br />D <br />MG/L <br />4/17/2007 4/12/2017 <br />6 <br />0.6 <br />0.5 <br />1 <br />0.4 <br />0.2 <br />CATION <br />Sodium <br />D <br />MG/L <br />4/17/2007 4/12/2017 <br />6 <br />326 <br />328 <br />339 <br />306 <br />11.3 <br />ANION <br />Alkalinity, Bicarbonate as CaCO3 <br />N <br />MG/L <br />4/17/2007 4/12/2017 <br />6 <br />585 <br />607 <br />635 <br />490 <br />56.8 <br />ANION <br />Alkalinity, Carbonate as CaCO3 <br />N <br />MG/L <br />4/17/2007 4/12/2017 <br />6 <br />34.6 <br />33.7 <br />45 <br />24 <br />8.89 <br />ANION <br />Sulfates <br />N <br />MG/L <br />4/17/2007 4/12/2017 <br />6 <br />190 <br />190 <br />210 <br />160 <br />17 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />4/17/2007 4/12/2017 <br />6 <br />0.5 <br />0.5 <br />0.5 <br />0.5 <br />0 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />4/17/2007 4/12/2017 <br />6 <br />200 <br />200 <br />200 <br />200 <br />0 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />4/17/2007 4/12/2017 <br />6 <br />1 <br />1 <br />1 <br />1 <br />0 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />4/17/2007 4/12/20171 <br />6 <br />0.3 <br />0.3 <br />0.5 <br />0.3 <br />0.08 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />4/17/2007 4/12/2017 <br />6 <br />68 <br />55 <br />110 <br />50 <br />26 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />4/17/2007 4/12/2017 <br />6 <br />203 <br />30 <br />671 <br />7 <br />285 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />4/17/2007 4/12/2017 <br />6 <br />80 <br />80 <br />100 <br />50 <br />30 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />IN <br />MG/L <br />4/17/2007 4/12/2017 <br />6 <br />0.3 <br />0.2 <br />0.9 <br />0.05 <br />0.32 <br />NUTRIENT <br />Phosphorus, Orthophos horus <br />IN <br />MG/L <br />4/17/2007 4/12/20171 <br />5 <br />0.05 <br />0.04 <br />0.09 <br />0.04 <br />0.02 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables0183106 <br />