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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 /> Project ID (name) ARCO/#2133/Stockton CA Matrix A ueous <br /> Laboratory Control Sample Summary <br /> Spike check Sawie QC Percent AcCeptaW lity Limits <br /> Analyte Amount Concentration Recovery Recovery <br /> EPA 8020 Units ug/L QC Batch Q070294-2 <br /> Benzene 20 0 19 0 95 0 71.5-121% <br /> Toluene 20 0 19 5 97 5 72 4-124% <br /> Ethylbenzene 20 0 19 5 97 5 73 3-124X <br /> Xylenes (Total) 60 0 56 2 93 7 71 9-13OX <br /> Notes <br /> GTEL Concord. CA <br /> C4060485 2 <br /> WSTEL <br /> iNVINONMINTAI <br /> IMEWARORATORIER INC. <br />