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Table: 12a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary, of Water Quality <br />Site: 95M001 Bedrock Well, Trout Creek Sandstone Datum: 7184.68 <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 />5/2/1996 4/6/2017 <br />16 <br />9.946 <br />9.855 <br />11.14 <br />9.16 <br />0.4205 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />5/2/1996 4/6/2017 <br />16 <br />1190 <br />1250 <br />1790 <br />700 <br />274 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />5/2/1996 4/6/2017 <br />16 <br />12.8 <br />13.1 <br />15.1 <br />10.3 <br />1.23 <br />PHYSICAL <br />pH, Lab <br />N <br />1S.U. <br />5/7/1997 4/6/2017 <br />18 <br />10.07 <br />9.95 <br />11.39 <br />9.6 <br />0.4184 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />5/2/1996 4/6/2017 <br />20 <br />1127 <br />1150 <br />1761 <br />651 <br />275.4 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />5/2/1996 4/6/2017 <br />20 <br />665 <br />684 <br />1010 <br />450 <br />140 <br />CATION <br />Calcium <br />D <br />MG/L <br />5/2/1996 4/6/2017 <br />20 <br />3.68 <br />3.26 <br />8.2 <br />0.31 <br />2.34 <br />CATION <br />Ma nesium <br />D <br />MG/L <br />5/2/199614/6/2017 <br />20 <br />1.3 <br />0.65 <br />5.2 <br />0.01 <br />1.5 <br />CATION <br />Sodium <br />D <br />MG/L <br />5/2/1996 4/6/2017 <br />20 <br />221 <br />228 <br />410 <br />72 <br />70.4 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />5/2/1996 4/6/2017 <br />19 <br />158 <br />129 <br />410 <br />62 <br />85.6 <br />ANION <br />Alkalinity, Carbonate as CaCO3 <br />N <br />MG/L <br />5/2/1996 4/6/2017 <br />20 <br />136 <br />134 <br />253 <br />42 <br />65.5 <br />ANION <br />Sulfates <br />N <br />MG/L <br />5/2/1996 4/6/2017 <br />20 <br />180 <br />210 <br />4301 <br />20 <br />100 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />5/2/1996,4/6/2017 <br />20 <br />3 <br />0.5 <br />30 <br />0.5 <br />7 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />5/2/1996 4/6/2017 <br />20 <br />80 <br />50 <br />200 <br />20 <br />70 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />5/2/1996 4/6/2017 <br />20 <br />0.4 <br />0.2 <br />1 <br />0.2 <br />0.4 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />5/2/1996 4/6/2017 <br />20 <br />2.9 <br />1 <br />18 <br />0.1 <br />4.5 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />5/2/1996 4/6/2017 <br />20 <br />174 <br />95 <br />1110 <br />5 <br />260 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />5/2/199614/6/2017 <br />20 <br />10 <br />5 <br />30 <br />5 <br />10 <br />TRACE <br />Mol bdenum <br />D <br />UG/L <br />5/2/199614/6/2017 <br />20 <br />50 <br />50 <br />70 <br />30 <br />10 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />5/2/1996 4/6/20171 <br />201 <br />0.04 <br />0.02 <br />0.1 <br />0.02 <br />0.03 <br />NUTRIENT <br />I Phosphorus, Ortho hos horus <br />N <br />MG/L <br />15/2/199614/6/20171191 <br />0.9541 <br />0.89 <br />4.3 <br />0.017 <br />0.902 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables95M001 <br />