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Table: 17a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: Ashley Bedrock Well, Fish Creek Sandstone Datum: 6820.0 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count <br />Average <br />Median Maximum Minimum STDEV <br />FIELD <br />H Field <br />N <br />S.U. <br />3/18/1996 9/11/2017 <br />14 <br />7.73 <br />7.76 <br />8.2 <br />6.89 <br />0.334 <br />FIELD <br />Specific Conductivity, Field <br />N <br />UMHOS/CM <br />3/18/1996 9/11/2017 <br />14 <br />776 <br />796 <br />960 <br />610 <br />109 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />3/18/1996 9/11/2017 <br />14 <br />10.8 <br />10.5 <br />15.1 <br />8.6 <br />1.83 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />7/2/1997 <br />4/6/2017 <br />17 <br />7.98 <br />8 <br />8.66 <br />7.24 <br />0.339 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />3/18/1996 <br />4/6/2017 <br />18 <br />695 <br />695 <br />841 <br />542 <br />92.7 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />429 <br />420 <br />560 <br />328 <br />69.8 <br />CATION <br />Calcium <br />D <br />MG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />49.3 <br />53.9 <br />98.2 <br />1.7 <br />31.2 <br />CATION <br />Ma nesium <br />D <br />MG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />13.5 <br />13.9 <br />33 <br />0.38 <br />9.11 <br />CATION <br />Sodium <br />D <br />MG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />85 <br />49.8 <br />207 <br />16 <br />58.8 <br />ANION <br />Alkalinity, Bicarbonate as CaCO3 <br />N <br />MG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />417 <br />390 <br />680 <br />327 <br />85.7 <br />ANION <br />Alkalinity., Carbonate as CaCO3 <br />N <br />MG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />34 <br />20 <br />410 <br />1 <br />94 <br />ANION <br />Sulfates <br />N <br />MG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />45 <br />41 <br />70 <br />22 <br />12 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />3 <br />0.5 <br />39 <br />0.1 <br />9.1 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />100 <br />200 <br />200 <br />5 <br />80 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />0.7 <br />1 <br />1 <br />0.2 <br />0.4 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />1.5 <br />0.9 <br />8 <br />0.3 <br />2 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />32 <br />35 <br />60 <br />6 <br />20 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />21 <br />30 <br />40 <br />5 <br />12 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />60 <br />50 <br />100 <br />10 <br />30 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />IN I <br />MG/L <br />3/18/1996 <br />4/6/2017 <br />18 <br />1.78 <br />0.751 <br />9.11 <br />0.15 <br />2.42 <br />NUTRIENT <br />I Phosphorus, Orthophosphorus <br />IN I <br />MG/L <br />3/18/1996 <br />4/6/20171 <br />171 <br />0.0261 <br />0.0281 <br />0.051 <br />0.006 <br />0.014 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL TablesASHLEY <br />