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DUPLICATE CONTROL SAMPLE REPORT <br />Hydrocarbon Work Cell <br />Analyte <br />�J Enseco <br />Corning Environmental Services <br />Concentration Accuracy Precision <br />Spiked Measured Averae(% (RPD <br />DCS1 DCS2 AVG DCSimils DCS Limit <br />Category: TPH-BTEX-A <br />' Matrix: AQUEOUS <br />QC Lot: 22 JUL 94-19A <br />Concentration Units: ug/L <br />Benzene 5.00 4.73 4.20 4.46 89 79-121 12*10.0 <br />'Toluene 5.00 4.87 4.35 4.61 92 76-120 11*10.0 <br />Gasoline 1000 899 797 848 85 80-117 12*10.0 <br />* = RPD outside QC Limits <br />Calculations are performed before rounding to avoid round -off errors in calculated results. <br />1 <br />1 <br />t <br />1 <br />1 <br />1 <br />1 <br />1 <br />