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S�Enseco <br /> A Corning Cumpanv <br /> DUPLICATE CONTROL SAMPLE REPORT <br /> Hydrocarbon Work Cell <br /> Concentration Accuracy Precision <br /> Analyte Spiked Measured Average(%) (RPD) <br /> DCS1 DCS2 AVG DCS Limits DCS Limit <br /> Category- TPH-BTEX-A <br /> Matrix: AQUEOUS <br /> QC Lot: 07 OCT 91-14A <br /> Concentration Units ug/L <br /> Benzene 5 0 4.74 4.56 4 65 93 82-112 3.9 11 <br /> Toluene 5.0 4 73 4.58 4 66 93 81-114 3 2 13 <br /> Gasoline 1000 1010 963 986 99 81-114 4 8 13 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> i <br />