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Table: 6a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 93M001 Bedrock Well, Wadge Overburden Datum: 7013.5 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count Average <br />Median MaximuMinimum <br />STDE <br />FIELD <br />pH, Field <br />N <br />S.U. <br />12/29/1993 <br />9/11/2017 <br />24 <br />9.44 <br />9.42 <br />10.6 <br />8.4 <br />0.478 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />12/29/1993 <br />9/11/2017 <br />24 <br />2100 <br />1980 <br />2970 <br />1720 <br />307 <br />FIELD <br />Temperature Field <br />N <br />DEG -C <br />12/29/1993 <br />9/11/2017 <br />24 <br />11.3 <br />11.3 <br />19 <br />8 <br />2.13 <br />PHYSICAL <br />H Lab <br />N <br />S.U. <br />5/6/1997 <br />4/6/2017 <br />22 <br />9.47 <br />9.5 <br />9.9 <br />8.89 <br />0.219 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />12/29/1993 <br />4/6/2017 <br />30 <br />2080 <br />1900 <br />3950 <br />1800 <br />492.2 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />1225 <br />1105 <br />2564 <br />980 <br />350.6 <br />CATION <br />Calcium <br />D <br />MG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />1.98 <br />1.7 <br />4 <br />1.3 <br />0.738 <br />CATION <br />Magnesium <br />D <br />MG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />1.47 <br />1.15 <br />5 <br />0.5 <br />0.994 <br />CATION <br />Sodium <br />D <br />MG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />468 <br />468 <br />723 <br />120 <br />107 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />693.1 <br />767.5 <br />908 <br />105 <br />199.8 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />216.1 <br />189.5 <br />359 <br />111 <br />72.69 <br />ANION <br />Sulfates <br />N <br />MG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />133.7 <br />10 <br />1346 <br />1 <br />341.6 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />1 <br />0.5 <br />5 <br />0.1 <br />1 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />90 <br />50 <br />200 <br />20 <br />80 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />0.5 <br />0.2 <br />1 <br />0.2 <br />0.4 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />12/29/1993 <br />4/6/20171 <br />30 <br />1 <br />11 <br />5 <br />0.2 <br />1 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />227 <br />45 <br />4970 <br />5 <br />898 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />15 <br />10 <br />30 <br />5 <br />11 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />40 <br />40 <br />100 <br />10 <br />30 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />12/29/1993 <br />4/6/2017 <br />30 <br />0.051 <br />0.03 <br />0.11 <br />0.02 <br />0.04 <br />NUTRIENT <br />Phosphorus, Orthophosphorus <br />IN <br />MG/L <br />12/29/1993 <br />4/6/20171 <br />29 1 <br />0.0211 <br />0.02 <br />0.0511 <br />0.005 <br />0.012 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables93M001 <br />