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GTEL Client ID 020105306 QUALITY CONTROL RESULTS <br /> Login Number C4060485 Volatile Organics <br /> Project ID (number) GTI GC-A94-5 Method EPA 8020 <br /> Pro ect ID (name) ARCO/#2133/Stockton CA Matrix Aqueous <br /> Matrix Spike and Matrix Spike Duplicate Results <br /> Matrix Matrix Matrix Spike Matrix Spike <br /> Original Spike Spike Spike Ovplicate Duplicate Acceptability Limits <br /> Analyte Concentration Amount Concentration Recovery % Concentration Recovery X RPD I RPD X _ _Recovery X <br /> EPA 8020 GTEL Sample ID C4060492 04 Spike ID Q070294-3 Dup ID Q070294-4 <br /> Units u /L Analysis Date 01 JUL-94 02-JUL-94 02-JUL-94 Client ID Batch QC _ <br /> Benzene < 0 30 20 0 — 18.9 94 5 18 6 93 0 1 6 34 -57.3.1382 <br /> Toluene < 0 30 20 0 18 9 94 5 18 6 93 0 1 6 31 63-134% <br /> Ethylbenzene < 0 30 20 0 18 9 94 5 18.7 93 5 1 38 59 3-137% <br /> Xylenes (Total) < 0 50 60 0 53 9 89 8 53 0 88 3 1 6 31 59 3-144% <br /> Notes <br /> GTEL Concord, CA NGTEL <br /> C4060485 1 etlARORATORIIIs INC, <br />