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Table: 33a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 800 (USGS 09243800, Surface Water, Foidel Creek) Datum: 6940 <br />Type <br />Parameter <br />Fraction <br />Units <br />Period of Record <br />Sample Count Average <br />Median Maximum <br />Minimum <br />STDE <br />FIELD <br />Flow <br />N <br />CFS <br />3/5/1976 9/13/2017 <br />131 <br />2.884 <br />0.8 <br />56 <br />0.01 <br />7.25 <br />FIELD <br />H Field <br />N <br />S.U. <br />3/5/1976 9/13/2017 <br />257 <br />7.99 <br />8.01 <br />9.2 <br />6.8 <br />0.364 <br />FIELD <br />Specific Conductivity, Field <br />N <br />UMHOS/CM <br />3/5/1976 9/13/2017 <br />261 <br />2259 <br />2500 <br />3940 <br />210 <br />881.5 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />4/8/1976 9/13/2017 <br />253 <br />12.6 <br />14 <br />26.21 <br />0 <br />6.38 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />11/5/1986 8/15/2017 <br />76 <br />8.13 <br />8.2 <br />8.7 <br />7.68 <br />0.21 <br />PHYSICAL <br />Sodium Adsorption Ratio <br />N <br />RATIO <br />3/5/1976 8/15/2017 <br />169 <br />19.55 <br />0.58 <br />3200 <br />0.057 <br />246.1 <br />PHYSICAL <br />Solids, Total Suspended <br />N <br />MG/L <br />3/5/1976 8/15/2017 <br />160 <br />93.1 <br />21.5 <br />2400 <br />2 <br />260 <br />PHYSICAL <br />Specific Conductivity, Lab <br />N <br />UMHOS/CM <br />10/2/1980 8/15/2017 <br />139 <br />2428 <br />2700 <br />4400 <br />6601 <br />882.3 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />11/5/1986 8/15/2017 <br />106 <br />2635 <br />2967 <br />3770 <br />8 <br />793.2 <br />CATION <br />Calcium <br />D <br />MG/L <br />3/5/197618/15/2017 <br />165 <br />255 <br />280 <br />730 <br />25 <br />120 <br />CATION <br />Magnesium <br />D <br />MG/L <br />3/5/1976 8/15/2017 <br />166 <br />188 <br />178 <br />415 <br />10 <br />116 <br />CATION <br />Sodium <br />D <br />MG/L <br />3/5/1976 8/15/2017 <br />165 <br />49.3 <br />47 <br />160 <br />6.1 <br />21 <br />ANION <br />Alkalinity,Bicarbonate as CaCO3 <br />N <br />MG/L <br />3/5/1976 8/15/2017 <br />117 <br />335.5 <br />330 <br />564 <br />140 <br />93.49 <br />ANION <br />Alkalinity, Carbonate as CaCO3 <br />N <br />MG/L <br />6/25/1992 8/15/2017 <br />83 <br />8.75 <br />2 <br />31 <br />0 <br />8.94 <br />ANION <br />Sulfates <br />N <br />MG/L <br />3/5/1976 8/15/2017 <br />165 <br />1222 <br />1210 <br />2510 <br />46 <br />746.4 <br />PRIMARY <br />Mercury <br />TR <br />UG/L <br />4/9/1979 8/2/2011 <br />82 <br />0.2 <br />0.2 <br />1 <br />0.0002 <br />0.1 <br />PRIMARY <br />Selenium <br />TR <br />UG/L <br />6/17/1987 8/15/2017 <br />97 <br />1.6 <br />1 <br />20 <br />0.1 <br />2.8 <br />SECONDARY <br />Iron <br />TR <br />UG/L <br />4/9/1979 8/15/2017 <br />158 <br />1350 <br />4501 <br />33000 <br />30 <br />3610 <br />SECONDARY <br />Manganese <br />TR <br />UG/L <br />4/9/197918/15/2017 <br />142 <br />323 <br />191 <br />4080 <br />10 <br />495 <br />SECONDARY <br />Silver <br />TR <br />UG/L <br />11/5/1986 8/15/2017 <br />105 <br />0.7 <br />0.5 <br />5 <br />0.0001 <br />1 <br />SECONDARY <br />Zinc <br />TR <br />UG/L <br />4/9/1979 8/15/2017 <br />121 <br />39 <br />20 <br />240 <br />5 <br />37 <br />TRACE <br />Molybdenum <br />TR <br />UG/L <br />4/9/1979 8/15/2017 <br />118 <br />561 <br />50 <br />300 <br />1 <br />60 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />2/12/1985 8/15/2017 <br />114 <br />0.15 <br />0.05 <br />0.5 <br />0.001 <br />0.18 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />IN <br />MG/L <br />3/5/1976.8/15/2017, <br />161 <br />1.35 <br />0.11 <br />66 <br />0.01 <br />6.36 <br />NUTRIENT <br />Phosphorus, Orthophosphorus <br />I N <br />I MG/L <br />1 3/5/197618/15/20171 <br />155 <br />0.0245 <br />0011 <br />0.21 <br />0.005 <br />0.031 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables800 <br />