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Table: 23a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 06AY1 (006 -AY -1, Alluvial Well, Fish Creek Alluvium) Datum: 6827.99 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count Average <br />Median Maximum <br />Minimum <br />STDEV <br />FIELD <br />pH, Field <br />N <br />S.U. <br />2/12/1985 9/10/2017 <br />216 <br />7.61 <br />7.58 <br />10.4 <br />6.53 <br />0.461 <br />FIELD <br />Specific Conductivity,Field <br />N <br />UMHOS/CM <br />1/16/1985 9/10/2017 <br />217 <br />986.4 <br />809 <br />5180 <br />410 <br />642.5 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />1/16/1985 9/10/2017 <br />217 <br />8.87 <br />9 <br />20 <br />2.9 <br />3.36 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />7/9/1986 9/10/2017 <br />46 <br />7.76 <br />7.85 <br />8.4 <br />6.88 <br />0.443 <br />PHYSICAL <br />S ecific Conductivity, Lab <br />N <br />UMHOS/CM <br />1/15/1987 9/10/2017 <br />83 <br />854.5 <br />771 <br />2390 <br />443 <br />360.2 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />1/16/1985 9/10/2017 <br />92 <br />727.1 <br />522 <br />4592 <br />253 <br />687.7 <br />CATION <br />Calcium <br />D <br />MG/L <br />1/16/1985 9/10/2017 <br />91 <br />105 <br />83.9 <br />520 <br />5.1 <br />77.7 <br />CATION <br />Magnesium <br />D <br />MG/L <br />1/16/1985 9/10/2017 <br />91 <br />53.4 <br />42.5 <br />252 <br />2.3 <br />38.9 <br />CATION <br />Sodium <br />D <br />MG/L <br />1/16/198519/10/2017 <br />91 <br />63.2 <br />30 <br />609 <br />1.4 <br />92.7 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />1/16/1985 9/10/2017 <br />95 <br />331.402 <br />311 <br />604 <br />163 <br />80.1674 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />2/28/1991 9/10/2017 <br />59 <br />8.03 <br />2 <br />20 <br />0 <br />8.71 <br />ANION <br />Sulfates <br />N <br />MG/L <br />1/16/1985 9/10/2017 <br />95 <br />317.7 <br />180 <br />2930 <br />40 <br />465.6 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />1/16/1985 9/10/2017 <br />91 <br />11 <br />0.5 <br />5 <br />0.1 <br />2 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />1/15/1987,9/10/2017 <br />82 <br />80 <br />40 <br />200 <br />20 <br />80 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />1/16/1985 9/10/2017 <br />91 <br />0.4 <br />0.2 <br />5 <br />0.1 <br />0.6 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />1/16/1985 9/10/2017 <br />91 <br />2.83 <br />1 <br />48.8 <br />0.2 <br />5.54 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />1/16/1985 9/10/20171 <br />92 <br />475 <br />75 <br />17000 <br />5 <br />1980 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />1/16/1985 9/10/2017 <br />90 <br />1170 <br />525 <br />10200 <br />5 <br />1950 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />1/15/1987 9/10/2017 <br />82 <br />46 <br />50 <br />250 <br />10 <br />35 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />4/8/1985 9/10/2017 <br />83 <br />0.15 <br />0.05 <br />5 <br />0.001 <br />56 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />1/16/1985 9/10/2017 <br />90 <br />0.145 <br />0.03 <br />3.39 <br />0.02E!4-61 <br />NUTRIENT <br />Phos horus, Orthophos horus <br />N <br />MG/L <br />4/8/198519/10/2017, <br />88 <br />0.0478 <br />0.02 <br />0.87 <br />0.005.141 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables06AY1 <br />