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TABLE: 41A <br />TWENTYMILE COAL COMPANY <br />2016 ANNUAL HYDROLOGY REPORT <br />HYDROLOGY I ONITORING DATA <br />PERIOD OF RECORD <br />Site: 307 (307, Surface Samples) DATUM = 6742.29 <br />Location Code <br />307 <br />Chemical Name <br />Units <br />Sample Count <br />Mean <br />Median Maximum Minimum <br />Alkalinity as CaCO3 @ pH 4.5 <br />MG/L <br />2 <br />272 <br />272 <br />283 <br />260 <br />Ammonia Nitrogen <br />MG/L <br />9 <br />0.16 <br />0.08 <br />0.5 <br />0.05 <br />Cadmiu Tot. Rec. <br />UG/L <br />2 <br />0.3 <br />0.3 <br />0.5 <br />0.1 <br />Calcium Dissolved <br />MG/L <br />2 <br />67.9 <br />67.9 <br />70 <br />65.8 <br />Carbon ite as CO3 <br />MG/L <br />2 <br />17 <br />17 <br />33 <br />0 <br />H Brox de as OH <br />MG/L <br />1 <br />20 <br />20 <br />20 <br />20 <br />Iron Tot. Rec. <br />UG/L <br />27 <br />1030 <br />1 290 <br />11600 <br />150 <br />Magnesium Dissolved <br />MG/L <br />2 <br />45.85 <br />45.85 <br />47.7 <br />44 <br />Manganese Tot. Rec. <br />UG/L <br />2 <br />37 <br />37 <br />60 <br />14 <br />Mercury Total <br />UG/L <br />1 <br />1 <br />1 <br />1 <br />1 <br />Molybdenum Tot. Rec. <br />UG/L <br />2 <br />30 <br />30 <br />50 <br />10 <br />NO3-NO2 Nitrogen <br />MG/L <br />2 <br />0.06 <br />0.06 <br />0.1 <br />0.02 <br />H Temperature <br />DEG -C <br />4 <br />21 <br />22 <br />22 <br />20 <br />H Lab <br />S.U. <br />12 <br />8.36 <br />8.45 <br />8.8 <br />7.8 <br />Phosphorus, Ortho hos horus <br />MG/L <br />2 <br />0.028 <br />0.028 <br />0.05 <br />0.005 <br />Selenium Tot. Rec. <br />UG/L <br />2 <br />0.75 <br />0.75 <br />1 <br />0.5 <br />Silver Tot. Rec. <br />UG/L <br />2 <br />0.4 <br />0.4 <br />0.5 <br />0.3 <br />Sodium Dissolved <br />MG/L <br />2 <br />31.95 <br />31.95 <br />33 <br />30.9 <br />Sodium Adsorption Ratio <br />RATIO <br />2 <br />0.7306 <br />0.7306 0.7512 <br />0.71 <br />Solids, Total Suspended <br />MG/L <br />10 <br />82.7 <br />23.5 <br />396 <br />5 <br />Specific Conductivity, Lab <br />UMS/CM <br />13 <br />937.2 <br />839 <br />2220 <br />315 <br />Sulfates <br />MG/L <br />2 <br />134 <br />134 <br />140 <br />128 <br />Total Dissolved Solids, Lab <br />MG/L <br />10 <br />667 <br />628 <br />1640 <br />180 <br />Zinc Tot. Rec. <br />UG/L <br />2 <br />30 <br />30 <br />50 1 <br />10 <br />2016 AHR FC POR <br />