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QC Sample Results <br />Client: Coors Energy Company <br />Project/Site: Keenesburg Mine, CO <br />TestAmerica Job ID: 280 - 33543 -1 <br />Method: SM 2510B - Conductivity, Specific Conductance (Continued) <br />Lab Sample ID: LCSD 280 - 139351/4 <br />Client Sample ID: Lab Control Sample Dup <br />Matrix: Water <br />Matrix: Water <br />Prep Type: Total /NA <br />Analysis Batch: 139351 <br />Prep Type: Total /NA <br />Analysis Batch: 138650 <br />Spike LCSD <br />LCSD <br />%Rec. RPD <br />Analyte <br />Added Result <br />Qualifier <br />Unit D %Rec Limits RPD Limit <br />Specific Conductance <br />1410 1400 <br />umhos /cm 99 90-110 0 10 <br />Lab Sample ID: 280 - 33481 -G-4 DU <br />Total Dissolved Solids <br />ND <br />Client Sample ID: Duplicate <br />Matrix: Water <br />09/24/12 09:22 1 <br />Lab Sample ID: LCS 280 - 138650/2 <br />Prep Type: Total /NA <br />Analysis Batch: 139351 <br />Client Sample ID: Lab Control Sample <br />Matrix: Water <br />Sample Sample <br />DU <br />DU <br />RPD <br />Analyte Result Qualifier <br />Result <br />Qualifier <br />Unit D RPD Limit <br />• <br />Specific Conductance 560 <br />552 <br />Spike <br />umhos /cm 1 10 <br />%Rec. <br />Method: SM 2540C - Solids, Total Dissolved (TDS) <br />Lab Sample ID: MB 280 - 13865011 <br />Client Sample ID: Method Blank <br />Matrix: Water <br />Prep Type: Total /NA <br />Analysis Batch: 138650 <br />MB MB <br />Analyte <br />Result Qualifier <br />RL Unit <br />D Prepared Analyzed Dil Fac <br />Total Dissolved Solids <br />ND <br />10 mg /L <br />09/24/12 09:22 1 <br />Lab Sample ID: LCS 280 - 138650/2 <br />Client Sample ID: Lab Control Sample <br />Matrix: Water <br />Prep Type: Total /NA <br />Analysis Batch: 138650 <br />Spike <br />LCS LCS <br />%Rec. <br />Analyte <br />Added <br />Result Qualifier <br />Unit D %Rec Limits <br />Total Dissolved Solids <br />500 <br />486 <br />mg /L 97 86-110 <br />Lab Sample ID: LCSD 280 - 138650/3 <br />Client Sample ID: Lab Control Sample Dup <br />Matrix: Water <br />Prep Type: Total /NA <br />Analysis Batch: 138650 <br />Spike <br />LCSD LCSD <br />%Rec. RPD <br />Analyte <br />Added <br />Result Qualifier <br />Unit D %Rec Limits RPD Limit <br />Total Dissolved Solids <br />500 <br />458 <br />mg /L 92 86-110 6 20 <br />Lab Sample ID: 280 - 33508 -A-5 DU <br />Client Sample ID: Duplicate <br />Matrix: Water <br />Prep Type: Total /NA <br />Analysis Batch: 138650 <br />Sample Sample <br />DU DU <br />RPD <br />Analyte <br />Result Qualifier <br />Result Qualifier <br />Unit D RPD Limit <br />Total Dissolved Solids <br />84 <br />88.0 <br />mg /L 5 10 <br />Lab Sample ID: MB 280 - 138879/1 <br />Client Sample ID: Method Blank <br />Matrix: Water <br />Prep Type: Total /NA <br />Analysis Batch: 138879 <br />MB MB <br />Analyte <br />Result Qualifier <br />RL Unit <br />D Prepared Analyzed Dil Fac <br />Total Dissolved Solids <br />ND <br />10 mg /L <br />09/25/12 09:47 1 <br />TestAmerica Denver <br />Page 23 of 33 9/28/2012 <br />