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Table: 31 a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: AVF15 ( AVF-15, Alluvial Well, Fish Creek Alluvium) Datum: 6628.4 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count <br />Average <br />Median Maximum Minimum <br />STDE <br />FIELD <br />H Field <br />N <br />S.U. <br />4/13/2017 4/13/2017 <br />1 <br />6.84 <br />6.84 <br />6.84 <br />6.84 <br />0 <br />FIELD <br />Specific Conductivity, Field <br />N <br />UMHOS/CM <br />4/13/2017 4/13/2017 <br />1 <br />1370 <br />1370 <br />1370 <br />1370 <br />0 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />4/13/2017 4/13/2017 <br />1 <br />9 <br />9 <br />9 <br />9 <br />0 <br />PHYSICAL <br />pH,Lab <br />N <br />S.U. <br />7/23/2014 4/13/2017 <br />15 <br />7.9 <br />7.8 <br />8.3 <br />7.6 <br />0.21 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />7/23/2014 4/13/2017 <br />15 <br />962 <br />921 <br />1400 <br />765 <br />176 <br />PHYSICAL <br />Total Dissolved Solids Lab <br />N <br />MG/L <br />7/23/2014 4/13/2017 <br />15 <br />657 <br />622 <br />986 <br />480 <br />144 <br />CATION <br />Calcium <br />D <br />MG/L <br />7/23/2014 4/13/2017 <br />15 <br />95.2 <br />89.8 <br />138 <br />71.5 <br />18.4 <br />CATION <br />Magnesium <br />D <br />MG/L <br />7/23/2014 4/13/20171 <br />15 <br />42 <br />39.6 <br />62.5 <br />33.6 <br />8.5 <br />CATION <br />Sodium <br />D <br />MG/L <br />7/23/2014 4/13/2017 <br />15 <br />52 <br />38.4 <br />89.2 <br />32.9 <br />20.6 <br />ANION <br />Alkalinitv, Bicarbonate as CaCO3 <br />N <br />MG/L <br />7/23/2014 4/13/2017 <br />15 <br />436 <br />450 <br />497 <br />320 <br />54.8 <br />ANION <br />Alkalinitv, Carbonate as CaCO3 <br />N <br />MG/L <br />7/23/2014 4/13/2017 <br />15 <br />19 <br />20 <br />20 <br />3.4 <br />4.3 <br />ANION <br />Sulfates <br />N <br />MG/L <br />7/23/201414/13/2017 <br />15 <br />210 <br />1601 <br />400 <br />110 <br />98 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />7/23/201414/13/2017 <br />15 <br />0.5 <br />0.5 <br />0.5 <br />0.1 <br />0.1 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />7/23/2014 4/13/2017 <br />15 <br />200 <br />200 <br />200 <br />200 <br />0 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />7/23/2014 4/13/2017 <br />15 <br />1 <br />1 <br />1 <br />1 <br />0 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />7/23/2014 4/13/2017 <br />15 <br />0.93 <br />0.3 <br />4.2 <br />0.1 <br />1.3 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />7/23/2014 4/13/2017 <br />15 <br />9571 <br />160 <br />6690 <br />40 <br />1860 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />7/23/2014 4/13/2017 <br />15 <br />572 <br />467 <br />1210 <br />299 <br />266 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />7/23/2014 4/13/2017 <br />15 <br />100 <br />100 <br />100 <br />100 <br />0 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />7/23/2014 4/13/2017 <br />15 <br />0.24 <br />0.2 <br />0.731 <br />0.09 <br />0.15 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />7/23/2014 4/13/2017 <br />15 <br />0.08 <br />0.1 <br />0.11 <br />0.03 <br />0.03 <br />NUTRIENTPhos <br />horus, Ortho hos horus <br />N <br />MG/L <br />7/23/2014 4/13/2017 <br />15 <br />0.03 <br />0.02 <br />0.05 <br />0.01 <br />0.02 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL TablesAVF15 <br />