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Quality Control Results <br />Job Number: 720-948-1Client: Kennedy/Jenks Consultants <br />WaterClient Matrix: <br />1.0Dilution: <br />Date Analyzed: <br />Lab Sample ID: <br />12/24/2005 1154 <br />Method Blank - Batch: 720-3588 <br />Date Prepared: <br />Instrument ID: <br />Lab File ID: <br />Initial Weight/Volume: <br />Final Weight/Volume: <br />Injection Volume: <br />Analysis Batch: 720-3588 <br />Prep Batch: N/A <br />12/24/2005 1154 <br />10 mL <br />10 mL <br />Units:ug/L <br />Column ID:PRIMARY <br />Method: 8021B <br />Preparation: 5030B <br />N/A <br />PID/FID Gas/BtexMB 720-3588/1 <br />Analyte Result Qual RL <br />ND 0.50Benzene <br />ND 0.50Toluene <br />ND 0.50Ethylbenzene <br />ND 0.50Xylenes, Total <br />Surrogate % Rec Acceptance Limits <br />a,a,a-Trifluorotoluene (pid)107 58 - 124 <br />4-Bromofluorobenzene 108 50 - 150 <br />Water <br />1.0 <br />12/24/2005 1228Date Analyzed: <br />Laboratory Control Sample - Batch: 720-3588 <br />Client Matrix: <br />Lab Sample ID: <br />Dilution: <br />Date Prepared: <br />Instrument ID: <br />Lab File ID: <br />Initial Weight/Volume: <br />Final Weight/Volume: <br />Injection Volume:12/24/2005 1228 <br />Analysis Batch: 720-3588 <br />Prep Batch: N/A <br />10 mL <br />10 mL <br />Units:ug/L <br />Column ID:PRIMARY <br />Method: 8021B <br />Preparation: 5030B <br />N/A <br />PID/FID Gas/BtexLCS 720-3588/2 <br />Analyte QualLimit% Rec.ResultSpike Amount <br />50.5 57 112 77 - 123Benzene <br />50.4 53 105 78 - 122Toluene <br />50.3 54 108 70 - 130Ethylbenzene <br />152 140 95 75 - 125Xylenes, Total <br />Surrogate % Rec Acceptance Limits <br />a,a,a-Trifluorotoluene (pid)115 58 - 124 <br />4-Bromofluorobenzene 111 50 - 150 <br />STL San Francisco <br />Calculations are performed before rounding to avoid round-off errors in calculated results. <br />Page 28 of 32