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Table: 25a <br />Twentymile Coal, LLC <br />2017 Annual Hydrology Report <br />Period of Record Summary of Water Quality <br />Site: 08AU3 (008 -AU -3, Alluvial Well, Fish Creek Alluvium) Datum: 6609.86 <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 />9/23/1980 9/10/2017 <br />257 <br />7.4 <br />7.4 <br />8.21 <br />6.2 <br />0.338 <br />FIELD <br />Specific Conductivity, Field <br />N <br />UMHOS/CM <br />9/23/1980 9/10/2017 <br />257 <br />991.4 <br />1020 <br />1425 <br />390 <br />234.9 <br />FIELD <br />Temperature, Field <br />N <br />DEG -C <br />9/23/1980 9/10/2017 <br />258 <br />9.63 <br />9.4 <br />20 <br />2.6 <br />3.69 <br />PHYSICAL <br />pH, Lab <br />N <br />S.U. <br />7/3/1986 9/10/2017 <br />46 <br />7.72 <br />7.57 <br />8.4 <br />7.1 <br />0.383 <br />PHYSICAL <br />Specific Conductivity,Lab <br />N <br />UMHOS/CM <br />10/3/1986 9/10/2017 <br />83 <br />1077 <br />1050 <br />3310 <br />780 <br />281.5 <br />PHYSICAL <br />Total Dissolved Solids, Lab <br />N <br />MG/L <br />9/23/1980 9/10/2017 <br />107 <br />769.3 <br />720 <br />3760 <br />470 <br />330.8 <br />CATION <br />Calcium <br />D <br />MG/L <br />9/23/1980 9/10/2017 <br />106 <br />120 <br />111 <br />475 <br />12 <br />46.4 <br />CATION <br />Magnesium <br />D <br />MG/L <br />9/23/1980 9/10/2017 <br />106 <br />49.2 <br />46.7 <br />321 <br />3.9 <br />28.8 <br />CATION <br />Sodium <br />D <br />MG/L <br />9/23/1980 9/10/2017 <br />106 <br />62.6 <br />63.7 <br />200 <br />6 <br />19.2 <br />ANION <br />Alkalinity, Bicarbonate as CaCO3 <br />N <br />MG/L <br />9/23/1980 9/10/2017 <br />110 <br />372.734 <br />371.5 <br />756 <br />220 <br />58.1229 <br />ANION <br />Alkalinity,Carbonate as CaCO3 <br />N <br />MG/L <br />11/9/1981 9/10/2017 <br />60 <br />7.61 <br />2 <br />20 <br />0 <br />8.58 <br />ANION <br />Sulfates <br />N <br />MG/L <br />9/23/1980 9/10/2017 <br />111 <br />309 <br />280 <br />2330 <br />97 <br />208 <br />PRIMARY <br />Cadmium <br />D <br />UG/L <br />11/10/1980 9/10/2017 <br />98 <br />2.7 <br />0.5 <br />20 <br />0.1 <br />4.9 <br />PRIMARY <br />Lead <br />D <br />UG/L <br />11/10/1980 9/10/2017 <br />87 <br />80 <br />40 <br />300 <br />20 <br />80 <br />PRIMARY <br />Mercury <br />D <br />UG/L <br />11/10/1980 9/10/2017 <br />98 <br />0.5 <br />0.2 <br />7 <br />0.1 <br />0.8 <br />PRIMARY <br />Selenium <br />D <br />UG/L <br />11/10/1980 9/10/2017 <br />98 <br />1.51 <br />1 <br />16 <br />0.1 <br />2 <br />SECONDARY <br />Iron <br />D <br />UG/L <br />9/23/1980 9/10/2017 <br />106 <br />1660 <br />230 <br />52000 <br />5 <br />6140 <br />SECONDARY <br />Manganese <br />D <br />UG/L <br />9/23/1980 9/10/2017 <br />105 <br />556 <br />570 <br />1240 <br />8 <br />216 <br />TRACE <br />Molybdenum <br />D <br />UG/L <br />11/10/1980 9/10/2017 <br />87 <br />54 <br />50 <br />300 <br />10 <br />48 <br />NUTRIENT <br />Ammonia Nitrogen <br />N <br />MG/L <br />5/8/1981 9/10/2017 <br />85 <br />0.12 <br />0.01 <br />51 <br />0.001 <br />0.55 <br />NUTRIENT <br />NO3-NO2 Nitrogen <br />N <br />MG/L <br />9/23/1980 9/10/2017 <br />105 <br />0.145 <br />0.06 <br />1.21 <br />0.02 <br />0.252 <br />NUTRIENT <br />Phosphorus, Orthophosphorus <br />N <br />MG/L <br />11/10/1980 9/10/20171 <br />97 <br />0.021 <br />0.01 <br />0.221 <br />0.005 <br />0.027 <br />2/27/2018 I:\Environmental\CDMG - CDRMS\AHR\2017\AHR ALL FINAL Tables08AU3 <br />