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- <br /> �'� <br /> • 6 <br /> Emeco <br /> A Cummq C�Nnv <br /> DUPLICATE CONTROL SAMPLE REPORT <br /> Volatile Organics by GC/MS <br /> Concentration Accuracy Precision <br /> Analyte Spiked Measured Average;X) JRPD) <br /> DCS1 OCS2 AVG DCS Limits D S Limit <br /> Category: 624-A <br /> Matrix: AQUEOUS <br /> QC Lot: 01 MAY 91-03A <br /> Concentration Units: ug/L <br /> 1,1-Dichloroethene 50 60.5 58.1 59.3 119 '52-150 4.0 15 <br /> Trichloroethene 30 60.8 58.4 59.6 . 119 76-129 4.0 13 <br /> Benzene 50' 53.0 51.4 52.2 I04 80-130 3.1 12 <br /> Toluene 50 51.8 52.3 52,0 104 77-127 1.0 10 <br /> Chlorobenzene 50 55.1 56.6 55.8 112 84-128 2.7 11 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. r <br /> r. <br /> 4_ <br />