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Table: 29a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: AVF13 ( AVF-13, Alluvial Well, Fish Creek Alluvium) Datum: 6685.68 <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 />H, Field <br />N <br />S.U. <br />8/27/2001 <br />9/10/2017 <br />12 <br />7.63 <br />7.66 <br />8.5 <br />7.03 <br />0.378 <br />FIELD <br />Specific Conductivity, Field <br />N <br />UMHOS/CM <br />8/27/2001 <br />9/10/2017 <br />12 <br />1158 <br />1150 <br />1420 <br />795 <br />202.5 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />8/27/2001 <br />9/10/2017 <br />12 <br />9.21 <br />8.05 <br />14.2 <br />2.8 <br />3.91 <br />PHYSICAL <br />pH, Lab <br />N <br />IS.U. <br />8/27/2001 <br />9/10/2017 <br />27 <br />7.92 <br />8.1 <br />8.41 <br />7.22 <br />0.344 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />8/27/2001 <br />9/10/2017 <br />27 <br />1053 <br />950 <br />1550 <br />786 <br />214.7 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />730 <br />712 <br />1110 <br />510 <br />174 <br />CATION <br />Calcium <br />D <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />108 <br />98.6 <br />240 <br />72.7 <br />35.7 <br />CATION <br />Magnesium <br />D <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />48.51 <br />48.4 <br />72.1 <br />13 <br />13 <br />CATION <br />Sodium <br />D <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />73.5 <br />74.3 <br />100 <br />49.6 <br />16.8 <br />ANION <br />Alkalinity, Bicarbonate as CaCO3 <br />N <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />437 <br />405 <br />587 <br />329 <br />66.3 <br />ANION <br />Alkalinitv, Carbonate as CaCO3 <br />N <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />15 <br />20 <br />20 <br />1 <br />8.1 <br />ANION <br />Sulfates <br />N <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />250 <br />230 <br />460 <br />120 <br />89 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />1 <br />0.5 <br />5 <br />0.5 <br />1 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />200 <br />200 <br />200 <br />50 <br />60 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />0.8 <br />1 <br />1 <br />0.2 <br />0.4 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />0.7 <br />0.3 <br />3 <br />0.1 <br />0.9 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />802 <br />150 <br />15000 <br />5 <br />2870 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />988 <br />910 <br />2000 <br />5 <br />547 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />70 <br />50 <br />100 <br />50 <br />20 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />27 <br />0.48 <br />0.14 <br />5 <br />0.05 <br />1.1 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />8/27/2001 <br />9/10/2017 <br />271 <br />0.069 1 <br />0.11 <br />0.17 <br />0.02 <br />0.042 <br />NUTRIENT <br />Phosphorus, Orthophosphorus <br />N <br />MG/L <br />18/27/200119/10/2017, <br />241 <br />0.0351 <br />0.021 <br />0.17 <br />0.01 <br />0.037 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL TablesAVF13 <br />