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Table: 2Ta <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site:08AT1 (008 -AT -1, Alluvial Well, Trout Creek Alluvium) Datum: 6580.43 <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 />pH, Field <br />N <br />S.U. <br />2/17/1994 9/10/2017 <br />112 <br />7.51 <br />7.51 <br />8.21 <br />6.59 <br />0.335 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />2/17/1994 9/10/2017 <br />112 <br />1020 <br />1020 <br />1350 <br />460 <br />157 <br />FIELD <br />Tem erature, Field <br />N <br />DEG -C <br />2/17/1994 9/10/2017 <br />112 <br />9.16 <br />9.1 <br />19 <br />3.5 <br />3.05 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />3/4/1997 9/10/2017 <br />52 <br />7.65 <br />7.81 <br />8.2 <br />6.81 <br />0.397 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />3/18/1994 9/10/2017 <br />64 <br />947.8 <br />953 <br />1250 <br />643 <br />149.2 <br />PHYSICAL <br />Total Dissolved Solids Lab <br />N <br />MG/L <br />3/18/1994 9/10/2017 <br />64 <br />683 <br />700 <br />980 <br />426 <br />127 <br />CATION <br />Calcium <br />D <br />MG/L <br />3/18/1994 9/10/2017 <br />64 <br />115 <br />120 <br />240 <br />10 <br />33.8 <br />CATION <br />Magnesium <br />D <br />MG/L <br />3/18/1994 9/10/2017 <br />64 <br />49.6 <br />52.3 <br />105 <br />3.7 <br />13.8 <br />CATION <br />Sodium <br />D <br />MG/L <br />3/18/1994 9/10/2017 <br />64 <br />33.51 <br />32.2 <br />122 <br />2.6 <br />13.4 <br />ANION <br />Alkalinity, Bicarbonate as CaCO3 <br />N <br />MG/L <br />3/18/1994 9/10/2017 <br />64 <br />314 <br />305.5 <br />476 <br />178 <br />59.22 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />3/18/1994 9/10/2017 <br />64 <br />10 <br />2 <br />20 <br />0 <br />9 <br />ANION <br />Sulfates <br />N <br />MG/L <br />3/18/1994 9/10/2017 <br />64 <br />296 <br />282 <br />901 <br />110 <br />113 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />3/18/1994 9/10/2017 <br />64 <br />1 <br />0.5 <br />5 <br />0.1 <br />2 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />3/18/1994 9/10/2017 <br />64 <br />100 <br />50 <br />200 <br />20 <br />80 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />3/18/1994 9/10/2017 <br />64 <br />0.5 <br />0.2 <br />1 <br />0.02 <br />0.4 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />3/18/1994 9/10/2017 <br />64 <br />1 <br />1 <br />2.3 <br />0.1 <br />0.67 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />3/18/1994 9/10/2017 <br />64 <br />755 <br />385 <br />4350 <br />5 <br />920 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />3/18/1994 9/10/2017 <br />64 <br />908 <br />814 <br />2550 <br />5 <br />480 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />3/18/1994 9/10/2017 <br />64 <br />501 <br />50 <br />100 <br />10 <br />30 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />12/28/1994 9/10/2017 <br />60 <br />0.24 <br />0.055 <br />5 <br />0.01 <br />0.68 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />3/18/199419/10/2017 <br />64 <br />0.07 <br />0.05 <br />0.37 <br />0.02 <br />0.061 <br />NUTRIENT <br />Phosphorus, Orthophos horus <br />N <br />MG/L <br />3/18/1994 9/10/2017 <br />61 <br />0.022 <br />0.01 <br />0.12 <br />0.0051 <br />0.021 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables08AT1 <br />