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Table: 8a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: FBR2 (FBR-2 Bedrock Well, Twentymile Sandstone) Datum: 6794.3 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count Average <br />Median Maximum <br />Minimum <br />STDEV <br />FIELD <br />pH, Field <br />N <br />S.U. <br />11/29/1995 <br />9/11/2017 <br />20 <br />8.88 <br />8.86 <br />9.14 <br />8.53 <br />0.167 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />11/29/1995 9/11/2017 <br />20 <br />1710 <br />1730 <br />1910 <br />1540 <br />79.6 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />11/29/1995 <br />9/11/2017 <br />20 <br />11.3 <br />11.5 <br />13 <br />9.3 <br />0.888 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />5/12/1997 <br />4/6/2017 <br />21 <br />8.95 <br />91 <br />9.2 <br />8.6 <br />0.149 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />11/29/1995 <br />4/6/2017 <br />25 <br />1719 <br />1690 <br />1910 <br />1541 <br />104.9 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />1020 <br />980 <br />1170 <br />928 <br />81.7 <br />CATION <br />Calcium <br />D <br />MG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />4.59 <br />4.3 <br />6.9 <br />3.5 <br />0.884 <br />CATION <br />Magnesium <br />D <br />MG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />2.12 <br />2.1 <br />3.1 <br />1.11 <br />0.466 <br />CATION <br />Sodium <br />D <br />MG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />3991 <br />415 <br />485 <br />100 <br />81.2 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />8911 <br />835 <br />1190 <br />780 <br />118 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />67.7 <br />68 <br />83 <br />54 <br />7.82 <br />ANION <br />Sulfates <br />N <br />MG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />20 <br />10 <br />50 <br />1 <br />20 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />11/291995 <br />4/6/2017 <br />25 <br />1 <br />0.5 <br />5 <br />0.5 <br />2 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />110 <br />90 <br />200 <br />20 <br />76 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />0.51 <br />0.2 <br />1 <br />0.2 <br />0.4 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />11/29/1995 <br />4/6/20171 <br />25 <br />1 <br />1 <br />6 <br />0.3 <br />1 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />186 <br />120 <br />1190 <br />10 <br />262 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />12 <br />7 <br />35 <br />5 <br />9.8 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />40 <br />50 <br />100 <br />10 <br />30 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />11/29/1995 <br />4/6/2017 <br />25 <br />0.05 <br />0.03 <br />0.1 <br />0.02 <br />0.04 <br />NUTRIENT <br />Phosphorus, Orthophosphorus <br />N I <br />MG/L <br />11/29/1995 <br />4/6/2017 <br />24 <br />0.0161 <br />0.011 <br />0.05 <br />0.005 <br />0.011 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL TablesFBR2 <br />