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Table: 13a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: FBR2E (FBR-2-E, Bedrock Well, Trout Creek Sandstone) Datum: 6794.29 <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 4/6/2017 <br />19 <br />9.663 <br />9.47 <br />11.46 <br />7.76 <br />0.7547 <br />FIELD <br />Specific Conductivity, Field <br />N <br />UMHOS/CM <br />11/29/1995 4/6/2017 <br />19 <br />1660 <br />1740 <br />1870 <br />610 <br />285 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />11/29/1995 4/6/2017 <br />19 <br />11.3 <br />11.3 <br />12.7 <br />9.6 <br />0.833 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />5/12/1997 4/6/2017 <br />19 <br />9.7 <br />9.6 <br />10.6 <br />8.3 <br />0.551 <br />PHYSICAL <br />Specific Conductivity,Lab <br />N <br />UMHOS/CM <br />11/29/1995 4/6/2017 <br />23 <br />1504 <br />1700 <br />1850 <br />246 <br />438.1 <br />PHYSICAL <br />Total Dissolved Solids Lab <br />N <br />MG/L <br />11/29/1995 4/6/2017 <br />23 <br />828 <br />960 <br />1010 <br />96 <br />257 <br />CATION <br />Calcium <br />D <br />MG/L <br />11/29/1995 4/6/2017 <br />23 <br />4.13 <br />1.2 <br />44.3 <br />0.7 <br />9.58 <br />CATION <br />Ma nesium <br />D <br />MG/L <br />11/29/1995 4/6/2017 <br />23 <br />3.9 <br />0.6 <br />60 <br />0.1 <br />12.5 <br />CATION <br />Sodium <br />D <br />MG/L <br />11/29/1995 4/6/2017 <br />23 <br />334 <br />382 <br />454 <br />42.8 <br />130 <br />ANION <br />Alkalinity, Bicarbonate as CaCO3 <br />N <br />MG/L <br />11/29/1995 4/6/2017 <br />23 <br />398 <br />393 <br />810 <br />2 <br />266 <br />ANION <br />Alkalinity, Carbonate as CaCO3 <br />N <br />MG/L <br />11/29/1995 4/6/2017 <br />23 <br />225 <br />170 <br />497 <br />2 <br />153 <br />ANION <br />Sulfates <br />N <br />MG/L <br />11/29/199514/6/2017 <br />23 <br />30 <br />20 <br />140 <br />4 <br />30 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />11/29/1995 4/6/2017 <br />23 <br />2 <br />0.5 <br />5 <br />0.5 <br />2 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />11/29/1995 4/6/2017 <br />23 <br />80 <br />50 <br />200 <br />30 <br />60 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />11/29/1995 4/6/2017 <br />23 <br />0.4 <br />0.2 <br />1 <br />0.2 <br />0.3 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />11/29/1995 4/6/2017 <br />23 <br />2.41 <br />1 <br />29 <br />0.3 <br />5.8 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />11/29/1995 4/6/2017 <br />23 <br />69 <br />50 <br />180 <br />5 <br />57 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />11/29/1995 4/6/2017 <br />23 <br />21.7 <br />5 <br />150 <br />5 <br />36.3 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />11/29/1995 4/6/2017 <br />23 <br />40 <br />50 <br />100 <br />10 <br />30 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />11/29/1995,4/6/2017 <br />23 <br />0.054 <br />0.02 <br />0.43 <br />0.02 <br />0.087 <br />NUTRIENT <br />Phosphorus, Orthophosphorus <br />N I <br />MG/L 111/29/199514/6/2017, <br />221 <br />0.017 <br />0.01 <br />0.05 <br />0.005 <br />0.014 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL TablesFBR2E <br />