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Table: 30a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: AVF14 ( AVF-14, Alluvial Well, Fish Creek Alluvium) Datum: 6650.39 <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 />8/27/2001 <br />9/10/2017 <br />11 <br />7.69 <br />7.53 <br />8.55 <br />7.05 <br />0.427 <br />FIELD <br />Specific Conductivity, Field <br />N <br />UMHOS/CM <br />8/27/2001 <br />9/10/2017 <br />11 <br />993.6 <br />980 <br />1359 <br />860 <br />132.2 <br />FIELD <br />Tem erature Field <br />N <br />DEG -C <br />8/27/2001 <br />9/10/2017 <br />11 <br />8.83 <br />7.4 <br />15 <br />2.7 <br />3.99 <br />PHYSICAL <br />pH, Lab <br />N <br />IS.U. <br />8/27/2001 <br />9/10/2017 <br />26 <br />8.02 <br />8.1 <br />8.41 <br />7.31 <br />0.302 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />8/27/2001 <br />9/10/2017 <br />26 <br />831 <br />808 <br />990 <br />723 <br />81.4 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />555 <br />531 <br />710 <br />450 <br />72.1 <br />CATION <br />Calcium <br />D <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />86.8 <br />84.9 <br />130 <br />71.1 <br />12.6 <br />CATION <br />Magnesium <br />D <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />34.9 <br />34.1 <br />54 <br />14 <br />7.43 <br />CATION <br />Sodium <br />D <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />54.5 <br />52.8 <br />94 <br />44.7 <br />9.58 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />335 <br />340 <br />388 <br />284 <br />25.8 <br />ANION <br />AlkalinitV, Carbonate as CaCO3 <br />N <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />15 <br />20 <br />20 <br />1 <br />8.3 <br />ANION <br />Sulfates <br />N <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />25 <br />190 <br />170 <br />330 <br />140 <br />46 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />1 <br />0.5 <br />5 <br />0.5 <br />1 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />200 <br />200 <br />200 <br />50 <br />60 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />0.8 <br />1 <br />1 <br />0.2 <br />0.3 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />1 <br />0.3 <br />13 <br />0.1 <br />2.5 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />300 <br />110 <br />4500 <br />5 <br />860 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />102 <br />83.5 <br />310 <br />5 <br />67.8 <br />TRACE <br />Mol bdenum <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />26 <br />70 <br />50 <br />100 <br />50 <br />20 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />18/27/200119/10/2017 <br />26 <br />0.59 <br />0.2 <br />5 <br />0.05 <br />1.3 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />18/27/200119/10/2017 <br />26 <br />0.1 <br />0.1 <br />0.87 <br />0.02 <br />0.16 <br />NUTRIENT <br />Phosphorus, Orthophosphorus <br />IN <br />I MG/L <br />18/27/200119/10/2017 <br />23 <br />0.03 <br />0.031 <br />0.051 <br />0.01 <br />0.02 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL TablesAVF14 <br />