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Enseco <br /> A Coming Company <br /> iDUPLICATE CONTROL SAMPLE REPORT <br /> GC Preparation <br /> I <br /> Concentration Accuracy Precision <br /> Analyte Spiked Measured Avera e(%) RPD <br /> DCS1 DCS2 AVG DCS Limits DIS Limit <br /> Category: TPH-GRAV-S <br /> Matrix: SOIL <br /> QC Lot: 19 JUL 91-A <br /> Concentration Units: mg/Kg <br /> Total Petroleum Hydrocarbons 667 763 763 763 114 42-115 0.0 37 <br /> i <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> r <br />• <br /> I <br /> i <br />