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Table: 19a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 09S10 (009-S-10, Alluvial Well, Foidel Creek Alluvium) Datum: 6906.67 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count Average <br />Median Maximum Minimum STDEV <br />FIELD <br />H, Field <br />N <br />S.U. <br />7/2/1979 9/10/2017 <br />292 <br />7.65 <br />7.7 <br />8.8 <br />6.2 <br />0.463 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />6/18/1979 9/10/2017 <br />292 <br />1062 <br />1158 <br />3220 <br />330 <br />299 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />6/18/1979 9/10/2017 <br />294 <br />9.08 <br />8.4 <br />20 <br />3 <br />3.19 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />7/3/1986 9/10/2017 <br />48 <br />8.14 <br />8.2 <br />8.6 <br />7.57 <br />0.282 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />7/3/1986 9/10/2017 <br />88 <br />1199 <br />1202 <br />1540 <br />920 <br />81.76 <br />PHYSICAL <br />Total Dissolved Solids Lab <br />N <br />MG/L <br />3/8/1979 9/10/2017 <br />140 <br />759.6 <br />755 <br />1220 <br />580 <br />77.01 <br />CATION <br />Calcium <br />D <br />MG/L <br />3/8/1979 9/10/2017 <br />140 <br />43.21 <br />42 <br />122 <br />13.16 <br />12.8 <br />CATION <br />Magnesium <br />D <br />MG/L <br />3/8/1979 9/10/2017 <br />140 <br />20.9 <br />21 <br />92 <br />1.23 <br />8.95 <br />CATION <br />Sodium <br />D <br />MG/L <br />3/8/1979 9/10/2017 <br />140 <br />214 <br />212 <br />310 <br />20 <br />31.9 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />6/4/1979 9/10/2017 <br />137 <br />514.886 <br />526.8 <br />625 <br />204 <br />61.713 <br />ANION <br />Alkalinity, Carbonate as CaCO3 <br />N <br />MG/L <br />6/4/1979 9/10/2017 <br />84 <br />11.6 <br />8.8 <br />43.2 <br />0 <br />11.3 <br />ANION <br />Sulfates <br />N <br />MG/L <br />3/8/1979 9/10/2017 <br />140 <br />211 <br />208 <br />550 <br />110 <br />63.5 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />6/18/1979 9/10/2017 <br />111 <br />3.8 <br />0.5 <br />33 <br />0.1 <br />6.8 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />6/18/1979 9/10/2017 <br />99 <br />80 <br />40 <br />200 <br />10 <br />80 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />6/18/1979 9/10/2017 <br />116 <br />0.46 <br />0.2 <br />3 <br />0.1 <br />0.45 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />6/18/1979 9/10/2017 <br />115 <br />1.4 <br />1 <br />24 <br />0.1 <br />2.3 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />3/8/1979V9/10/2017 <br />140 <br />119 <br />40 <br />4300 <br />5 <br />403 <br />SECONDARY <br />Man anese <br />D <br />UG/L <br />3/8/19792017 <br />139 <br />66.4 <br />33 <br />568 <br />5 <br />83.8 <br />TRACE <br />Mol bdenum <br />D <br />UG/L <br />6/18/19792017 <br />99 <br />61 <br />50 <br />500 <br />10 <br />73NUTRIENT <br />Ammonia Nitro en <br />N <br />MG/L <br />7/5/19792017 <br />99 <br />0.256 <br />0.02 <br />3 <br />0.001 <br />0.517 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />6/4/1979 9/10/2017 <br />138 <br />0.765 <br />0.73 <br />2.91 <br />0.02 <br />0.514 <br />NUTRIENT <br />Phosphorus, Orthophos horus <br />N <br />MG/L 16/18/197919/10/2017 <br />112 <br />0.141 <br />0.0395 <br />2.36 <br />0.005 <br />0.323 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables09S10 <br />