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Table: 21 a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 08AV2 (008 -AV -2, Alluvial Well, Foidel Creek Alluvium) Datum: 6677.1 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count <br />Average <br />Median Maximum Minimum <br />STDEV <br />FIELD <br />pH, Field <br />N <br />S.U. <br />9/23/1980 9/10/2017 <br />265 <br />7.37 <br />7.4 <br />8.37 <br />6.1 <br />0.361 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />9/23/1980 9/10/2017 <br />265 <br />1430 <br />1520 <br />2130 <br />560 <br />334.7 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />9/23/1980 9/10/2017 <br />265 <br />9.62 <br />9 <br />24 <br />2 <br />3.76 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />1/11/1987 9/10/20171 <br />47 <br />7.73 <br />7.91 <br />8.3 <br />6.91 <br />0.392 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />1/11/1987 9/10/2017 <br />87 <br />1604 <br />1600 <br />2420 <br />1180 <br />186.5 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />9/23/1980 9/10/2017 <br />111 <br />1215 <br />1222 <br />1970 <br />808 <br />166.6 <br />CATION <br />Calcium <br />D <br />MG/L <br />9/23/1980 9/10/2017 <br />110 <br />187 <br />186 <br />570 <br />21 <br />48.3 <br />CATION <br />Magnesium <br />D <br />MG/L <br />9/23/1980 9/10/2017 <br />110 <br />75.6 <br />77 <br />120 <br />7.4 <br />13.8 <br />CATION <br />Sodium <br />D <br />MG/L <br />9/23/198019/10/2017 <br />110 <br />85.4 <br />86.5 <br />142 <br />8.6 <br />15.9 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />10/7/1980 9/10/2017 <br />110 <br />388.06 <br />395 <br />483.12 <br />153 <br />56.756 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />10/7/1982 9/10/2017 <br />65 <br />7.86 <br />2 <br />20 <br />0 <br />8.83 <br />ANION <br />Sulfates <br />N <br />MG/L <br />9/23/1980 9/10/2017 <br />111 <br />608 <br />611 <br />1070 <br />348 <br />124 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />11/10/1980 9/10/2017 <br />100 <br />2.5 <br />0.5 <br />20 <br />0.1 <br />4.9 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />11/10/1980 9/10/20171 <br />92 <br />80 <br />40 <br />300 <br />20 <br />80 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />11/10/1980 9/10/2017 <br />100 <br />0.46 <br />0.2 <br />5 <br />0.1 <br />0.59 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />11/10/1980 9/10/2017 <br />100 <br />1.6 <br />1 <br />16 <br />0.1 <br />2.2 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />9/23/1980 9/10/2017 <br />110 <br />640 <br />150 <br />23000 <br />5 <br />2650 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />9/23/1980 9/10/2017 <br />109 <br />1260 <br />1100 <br />4310 <br />5 <br />1010 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />11/10/198019/10/2017 <br />92 <br />51 <br />50 <br />300 <br />10 <br />45 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />11/10/1980 9/10/2017 <br />91 <br />0.203 <br />0.05 <br />5 <br />0.001 <br />0.62 <br />NUTRIENT <br />NO3-1\102 Nitrogen <br />N <br />MG/L <br />10/7/1980 9/10/2017 <br />110 <br />0.223 <br />0.105 <br />3.1 <br />0.02 <br />0.366 <br />NUTRIENT <br />Phosphorus, Ortho hos horus <br />N <br />MG/L <br />11/10/1980 9/10/2017 <br />99 <br />0.023 <br />0.01 <br />0.29 <br />0.005 <br />0.037 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables08AV2 <br />