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TABLE: 4 <br />TWENTYMILE COAL, LLC <br />2015 ANNUAL HYDROLOGY REPORT <br />WATER QUALITY MONITORING DATA <br />Site: 911V1006 (91M006, Bedrock Well) DATUM=7306.9 <br />CATEGORY <br />PARAMETER <br />ANALYSIS TYPE <br />Units <br />OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br />Date <br />4/16/2015 <br />Water level <br />Field <br />FT <br />939.18 <br />Water Elevation Field <br />FT <br />6367.72 <br />PHYSICAL <br />CONDUCTIVITY LAB <br />UMS/CM <br />1230 <br />PH LAB S.U. <br />9.5 <br />SOLIDS TDS LAB MG/L <br />882 <br />TEMPERATURE FIELD DEGREE C <br />13.6 <br />CATION <br />CALCIUM <br />DISSOLVED <br />MG/L <br />1.4 <br />MAGNESIUM DISSOLVED MG/L <br />0.9 <br />SODIUM DISSOLVED MG/L <br />273 <br />ANION <br />CARBONATE <br />AS CO3 <br />MG/L <br />130 <br />SULFATE MG/L <br />20 <br />PRIMARY <br />CADMIUM <br />DISSOLVED <br />UG/L <br />< 0.5 <br />LEAD DISSOLVED UG/L <br />< 200 <br />MERCURY DISSOLVED UG/L <br />< 1 <br />SELENIUM DISSOLVED UG/L <br />0.1 <br />SECONDARY <br />IRON <br />DISSOLVED <br />UG/L <br />40 <br />MANGANESE DISSOLVED UG/L <br />< 30 <br />TRACE <br />MOLYBDENUM <br />DISSOLVED <br />UG/L <br />60 <br />NUTRIENT <br />NITROGEN <br />NO3-NO2 <br />MG/L <br />< 0.1 <br />PHOSPHATE ORTHO I MGL <br />0.25 <br />