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Table: 26a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 08AW3 (008 -AW -3, Alluvial Well, Fish Creek Alluvium) Datum: 6599.39 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count Average <br />Median Maximum Minimum <br />STDEV <br />FIELD <br />pH, Field <br />N <br />S.U. <br />7/8/1983 9/10/2017 <br />232 <br />7.04 <br />6.99 <br />8.3 <br />6.1 <br />0.329 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />7/8/1983 9/10/2017 <br />233 <br />3142 <br />3320 <br />4670 <br />950 <br />666.2 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />7/8/1983 9/10/2017 <br />233 <br />10.2 <br />10 <br />21 <br />2.1 <br />4.11 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />7/3/1986 9/10/20171 <br />50 <br />7.43 <br />7.5 <br />8.2 <br />6.7 <br />0.461 <br />PHYSICAL <br />Specific Conductivity,Lab <br />N <br />UMHOS/CM <br />10/3/1986 9/10/2017 <br />89 <br />3328 <br />3400 <br />4130 <br />945 <br />495.2 <br />PHYSICAL <br />Total Dissolved Solids Lab <br />N <br />MG/L <br />1/13/1984 9/10/2017 <br />99 <br />3277 <br />3280 <br />4310 <br />706 <br />583 <br />CATION <br />Calcium <br />D <br />MG/L <br />1/13/1984 9/10/2017 <br />99 <br />447 <br />437 <br />1100 <br />52 <br />115 <br />CATION <br />Magnesium <br />D <br />MG/L <br />1/13/1984 9/10/2017 <br />99 <br />2751 <br />272 <br />448 <br />28 <br />77.9 <br />CATION <br />Sodium <br />D <br />MG/L <br />1/13/1984 9/10/2017 <br />97 <br />1071 <br />117 <br />179 <br />5 <br />31.3 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />1/13/1984 9/10/2017 <br />102 <br />659.587 <br />659.5 <br />983 <br />344 <br />134.222 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />2/28/199119/10/2017 <br />63 <br />8 <br />2 <br />20 <br />0 <br />9 <br />ANION <br />Sulfates <br />N <br />MG/L <br />1/13/1984 9/10/2017 <br />103 <br />2148 <br />1910 <br />23000 <br />270 <br />2119 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />4/10/1984 9/10/2017 <br />93 <br />1.2 <br />0.5 <br />5 <br />0.1 <br />1.7 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />4/15/1987 9/10/2017 <br />86 <br />1001 <br />50 <br />400 <br />20 <br />100 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />4/10/1984 9/10/2017 <br />93 <br />0.4 <br />0.2 <br />1 <br />0.1 <br />0.4 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />4/10/1984 9/10/2017 <br />93 <br />1.7 <br />1 <br />15 <br />0.1 <br />2.4 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />1/13/1984 9/10/2017 <br />98 <br />5960 <br />365 <br />52600 <br />5 <br />10700 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />1/13/1984 9/10/2017 <br />98 <br />3185 <br />3730 <br />7790 <br />10 <br />2488 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />4/15/1987 9/10/2017 <br />86 <br />56 <br />50 <br />250 <br />10 <br />50 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />4/10/1984 9/10/2017 <br />85 <br />1.06 <br />0.05 <br />701 <br />0.001 <br />7.59 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />1/13/1984 9/10/2017 <br />97 <br />0.3 <br />0.1 <br />3.381 <br />0.02 <br />0.632 <br />NUTRIENT <br />Phosphorus, Orthophos horus <br />N <br />MG/L <br />4/10/1984 9/10/20171 <br />91 <br />0.02 <br />0.01 <br />0.181 <br />0.005 <br />0.028 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables08AW3 <br />