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TABLE: 39A <br />TWENTYMILE COAL COMPANY <br />2016 ANNUAL HYDROLOGY REPORT <br />HYDROLOGY MONITORING DATA <br />PERIOD OF RECORD <br />Site: 27A (27A, Surface Samples) DATUM = 6589.05 <br />Location Code <br />27A <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 />94 <br />238 <br />240 <br />1190 <br />84 <br />Alkalinity, Bicarbonate as CaCO3 <br />MG/L <br />10 <br />261 <br />287 <br />400 <br />78 <br />Ammonia Nitrogen <br />MG/L <br />97 <br />0.176 <br />0.05 <br />3 <br />0.001 <br />Arsenic Total <br />UG/L <br />41 <br />2 <br />1 <br />5 <br />1 <br />Cadmium Tot. Rec. <br />UG/L <br />104 <br />0.89 <br />0.5 <br />5 <br />0.1 <br />Calcium Dissolved <br />MG/L <br />204 <br />71.58 <br />70.2 <br />128 <br />27 <br />Carbonate as CO3 <br />MG/L <br />106 <br />13.52 <br />12 <br />84 <br />0 <br />Chloride <br />MG/L <br />66 <br />7 <br />6 <br />18 <br />1 <br />Hydroxide as OH <br />MG/L <br />57 <br />10 <br />20 <br />20 <br />0 <br />Iron Tot. Rec. <br />UG/L <br />104 <br />2820 <br />970 <br />29900 <br />220 <br />Iron Total <br />UG/L <br />100 <br />5546 <br />2580 <br />36750 <br />320 <br />Magnesium Dissolved <br />MG/L <br />204 <br />49.84 <br />50.6 <br />101 <br />13 <br />Manganese Dissolved <br />UG/L <br />1 <br />10 <br />10 <br />10 <br />10 <br />Manganese Tot. Rec. <br />UG/L <br />104 <br />109 <br />86.5 <br />602 <br />5 <br />Mercury (Total) <br />UG/L <br />76 <br />0.63 <br />1 <br />2 <br />0.1 <br />Molybdenum Tot. Rec. <br />UG/L <br />104 <br />40 <br />50 <br />100 <br />10 <br />NO3-NO2 Nitrogen <br />MG/L <br />204 <br />0.548 <br />0.175 <br />3.32 <br />0.005 <br />H Temperature <br />DEG -C <br />45 <br />21.13 <br />21 <br />24 <br />18.1 <br />H, Lab <br />S.U. <br />75 <br />8.38 <br />8.4 <br />8.8 <br />7.6 <br />Phosphorus, Ortho hos horus <br />MG/L <br />139 <br />0.0281 <br />0.02 <br />0.17 <br />0.005 <br />Selenium Tot. Rec. <br />UG/L <br />104 <br />1.5 <br />1 <br />9 <br />0.3 <br />Silver Tot. Rec. <br />UG/L <br />105 <br />1.8 <br />0.4 <br />50 <br />0.0001 <br />Sodium Dissolved <br />MG/L <br />204 <br />59.85 <br />46 <br />390 <br />8 <br />Sodium Adsorption Ratio <br />RATIO <br />187 <br />1.2654 <br />1 <br />7.7 <br />0.31 <br />Solids Settleable <br />ML/L <br />1 <br />0.2 <br />0.2 <br />0.2 <br />0.2 <br />Solids Total Suspended <br />MG/L <br />203 <br />146.2 <br />35 <br />1692 <br />2 <br />Specific Conductivity,Lab <br />UMS/CM <br />115 <br />927.2 <br />849 <br />2480 <br />297 <br />Sulfates <br />MG/L <br />208 <br />295.5 <br />260 <br />1124 <br />10 <br />Total Dissolved Solids, Lab <br />MG/L- <br />204 <br />636 <br />590 <br />1826 <br />182 <br />Zinc Tot. Rec. <br />UG/L <br />104 <br />30 <br />20 <br />140 <br />5 <br />2016 AHR FC POR <br />