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Enseco <br /> i A Corning Company <br /> ° DUPLICATE CONTROL SAMPLE REPORT <br /> 'Hydrocarbon Work Cell <br /> Concentration Accuracy Precision <br /> Analyte Spiked Measured Avera ge(9o} (RPD) <br /> DCSI DCS2 AVG DCS limits DCS Limit <br /> Category: TPH-BTEX-S <br /> Matrix: SOIL <br /> QC Lot: 17 OCT 91-19A <br /> Concentration Units: ug/kg <br /> Benzene 5.0 4.67 4.94 4.80 96 71-121 5.6 12 <br /> Toluene 5.0 4.83 5.19 5.01 100 71-116 7.2 15 <br /> Gasoline 1000 941 1020 980 98 81-117 8. 1 21 <br /> Category: TPN-BTEX-S <br /> Matrix: SOIL <br /> QC Lot: 23 SEP 91-14A <br />• Concentration Units: ug/kg <br /> Benzene 5.0 5.12 4.91 5.02 100 71-121 4.2 12 <br /> Toluene 5.0 4.97 4.89 4.93 99 71-116 1.6 15 <br /> Gasoline 1000 921 894 908 91 81-117 3.0 21 <br />• • Calculations are performed before rounding to avoid round-off errors in calculated results. <br />• <br />• <br />• <br /> • <br />