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Table: 20a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: O1S5 (001-S-5, Alluvial Well, Foidel Creek Alluvium) Datum: 6804.95 <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 />7/18/1979 9/10/2017 <br />279 <br />7.51 <br />7.52 <br />8.5 <br />6.19 <br />0.375 <br />FIELD <br />Specific Conductivity, Field <br />N <br />UMHOS/CM <br />7/18/1979 9/10/2017 <br />277 <br />1556 <br />1520 <br />3020 <br />225 <br />517.8 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />7/18/1979 9/10/2017 <br />275 <br />9.38 <br />9 <br />19 <br />4 <br />3.4 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />7/2/1986 9/10/2017 <br />47 <br />7.88 <br />7.9 <br />8.3 <br />7.15 <br />0.296 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />4/27/1987 9/10/2017 <br />86 <br />1886 <br />1907 <br />2810 <br />1230 <br />353.2 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />3/15/1979 9/10/2017 <br />128 <br />1282 <br />1230 <br />2090 <br />728 <br />370.8 <br />CATION <br />Calcium <br />D <br />MG/L <br />3/15/1979 9/10/2017 <br />129 <br />150 <br />141 <br />440 <br />4 <br />56.1 <br />CATION <br />Magnesium <br />D <br />MG/L <br />3/15/1979 9/10/2017 <br />128 <br />65 <br />61 <br />156 <br />0.65 <br />23.2 <br />CATION <br />Sodium <br />D <br />MG/L <br />3/15/1979 9/10/2017 <br />128 <br />178 <br />182 <br />318 <br />20 <br />47.2 <br />ANION <br />Alkalinity, Bicarbonate as CaCO3 <br />N <br />MG/L <br />5/8/1979 9/10/2017 <br />128 <br />493.623 <br />500.5 <br />892.8 <br />174 <br />98.0934 <br />ANION <br />Alkalinity, Carbonate as CaCO3 <br />N <br />MG/L <br />5/8/1979 9/10/2017 <br />73 <br />8.85 <br />2 <br />33.6 <br />0 <br />9.37 <br />ANION <br />Sulfates <br />N <br />MG/L <br />3/15/197919/10/2017 <br />131 <br />590 <br />580 <br />1100 <br />253 <br />221 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />5/4/1981 9/10/20171 <br />108 <br />3.4 <br />0.5 <br />36 <br />0.1 <br />6.6 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />5/4/1981 9/10/2017 <br />91 <br />901 <br />40 <br />400 <br />20 <br />90 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />5/4/1981 9/10/2017 <br />107 <br />0.46 <br />0.2 <br />7 <br />0.1 <br />0.74 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />5/4/1981 9/10/2017 <br />108 <br />1.89 <br />1 <br />35.3 <br />0.1 <br />3.88 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />3/15/1979 9/10/2017 <br />128 <br />392 <br />95 <br />15000 <br />4 <br />1360 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />3/15/197919/10/2017 <br />126 <br />136 <br />109 <br />640 <br />3 <br />139 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />5/4/1981 9/10/2017 <br />91 <br />53 <br />50 <br />300 <br />10 <br />47 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />5/4/1981 9/10/2017 <br />95 <br />1.36 <br />0.05 <br />17.61 <br />0.001 <br />3.24 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />7/18/1979 9/10/2017 <br />125 <br />0.8056 <br />0.21 <br />12.751 <br />0.01 <br />2.002 <br />NUTRIENT <br />Phosphorus, Orthophosphorus <br />N <br />MG/L <br />5/4/1981 9/10/20171 <br />104 <br />0.188 <br />0.02 <br />1.781 <br />0.0051 <br />0.396 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL TablesOlS5 <br />