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Table: 24 <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 06AZ3 (006 -AZ -3, Alluvial Well, Fish Creek Alluvium) Datum: 6749.6 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count Average <br />Median Maximum Minimum <br />STDEV <br />FIELD <br />H Field <br />N <br />S.U. <br />1/15/1987 4/11/2003 <br />186 <br />7.65 <br />7.67 <br />8.5 <br />6.86 <br />0.331 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />1/15/1987 4/11/2003 <br />187 <br />1403 <br />1410 <br />3490 <br />438.2 <br />320.4 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />1/15/1987 4/11/2003 <br />187 <br />8.74 <br />8.9 <br />18 <br />1.8 <br />3.25 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />1/15/1987 <br />5/4/20161 <br />43 <br />7.731 <br />7.68 <br />8.3 <br />7.06 <br />0.372 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />1/15/1987 <br />5/4/20161 <br />82 <br />1454 <br />1435 <br />2070 <br />878 <br />277.2 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />1/15/1987 <br />5/4/2016 <br />82 <br />1079 <br />1041 <br />1720 <br />596 <br />275.4 <br />CATION <br />Calcium <br />D <br />MG/L <br />1/15/1987 <br />5/4/2016 <br />82 <br />132 <br />126 <br />240 <br />19 <br />38.6 <br />CATION <br />Magnesium <br />D <br />MG/L <br />1/15/1987 <br />5/4/2016 <br />82 <br />57 <br />53.8 <br />93.5 <br />6.2 <br />16.8 <br />CATION <br />Sodium <br />D <br />MG/L <br />1/15/1987 <br />5/4/2016 <br />82 <br />139 <br />138 <br />180 <br />13 <br />20.7 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />1/15/1987 <br />5/4/20161 <br />85 <br />406.2 <br />412 <br />690 <br />168 <br />63.84 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />2/28/1991 <br />5/4/2016 <br />59 <br />7.8 <br />2 <br />20 <br />0 <br />8.9 <br />ANION <br />Sulfates <br />N <br />MG/L <br />1/15/1987 <br />5/4/2016 <br />86 <br />528 <br />479 <br />1870 <br />263 <br />218 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />1/15/1987 <br />5/4/2016 <br />81 <br />0.9 <br />0.5 <br />5 <br />0.1 <br />1 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />1/15/1987 <br />5/4/2016 <br />81 <br />70 <br />40 <br />200 <br />20 <br />70 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />1/15/1987 <br />5/4/2016 <br />81 <br />0.4 <br />0.2 <br />1 <br />0.1 <br />0.4 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />1/15/1987 <br />5/4/2016 <br />81 <br />1 <br />1 <br />6 <br />0.1 <br />0.9 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />1/15/1987 <br />5/4/2016 <br />82 <br />485 <br />165 <br />13000 <br />10 <br />1470 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />1/15/1987 <br />5/4/2016 <br />81 <br />128 <br />130 <br />680 <br />5 <br />78.4 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />1/15/1987 <br />5/4/2016 <br />81 <br />43 <br />50 <br />250 <br />10 <br />34 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />1/15/1987 <br />5/4/2016 <br />73 <br />0.589 <br />0.05 <br />4.11 <br />0.001 <br />0.879 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />1/15/1987 <br />5/4/2016 <br />82 <br />0.334 <br />0.2 <br />2.1 <br />0.02 <br />0.366 <br />NUTRIENT <br />Phosphorus, Ortho hos horus <br />N <br />MG/L <br />1/15/1987 <br />5/4/20161 <br />79 <br />0.0512 <br />0.01 <br />1.051 <br />0.005 <br />0.175 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables06AZ3 <br />