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Enseco <br /> A Coming Companv <br /> • DUPLICATE CONTROL SAMPLE REPORT <br /> Volatile Organics by GC <br /> Concentration Accuracy Precision` <br /> Analyte Spiked Measured Average(%) (RPD <br /> DCS1 DCS2 AVG DCS Limits DCS L mit <br /> Category: TPH-BTEX-S <br /> i Matrix: SOIL <br /> QC Lot: 25 JUN 91-14A <br /> Concentration Units: ug/kg <br /> Benzene 5.0 5.53 5.32 5.42 109 75-123 3.9 13 <br /> Toluene 5.0 5.19 5.03 5.11 102 74-126 3.1 18 <br /> Gasoline 1000 1040 1000 1020 102 74-126 3.9 18 <br /> Category: TPH-BTEX-S <br /> Matrix: SOIL <br /> QC Lot: 28 JUN 91-20A <br /> Concentration Units: ug/kg <br /> Benzene 5.0 4.77 4.69 4.73 95 75-123 1.7 13 <br /> Toluene 5.0 5.08 4.91 5.00 100 74-126 3.4 18 <br /> Gasoline 1000 905 909 907 91 74-126 0.4 18 <br />• Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> I <br /> I <br /> i . <br />