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Client Number 020105306 <br /> Facility Number 2133 <br /> Arco Representative Kyle Christie <br /> Project ID Stockton <br /> Work Order Number C4-03-0403 <br /> QC Check Sample Results <br /> Date of Expected <br /> Analyte Source Analysis Value Unds Recoverya, % <br /> Modified EPA 8020 <br /> Benzene Supeico 03/16/94 500 ug/L 970 <br /> Toluene Supeico 03/16/94 500 ug/L 946 <br /> Ethylbenzene Supeico 03/16/94 500 ug/L 942 <br /> X ene, total Su elco 03/16/94 150 u L..+-- 994 <br /> QC Matrix Spike and Duplicate Spike Results <br />. Matrix Water <br /> Duplicate <br /> Sample Spike Recovery, Recovery, Control <br /> Analyte ID Amount Units % % RPD, % Limits <br /> Modified EPA 8020: <br /> Benzene C4030384-08 200 ug/L 915 90 0 1 7 573- 138 <br /> Toluene C4030384-08 200 ug/L 910 89 0 22 630- 134 <br /> Ethylbenzene C4030384-08 200 ug/L 90.0 88 5 1 7 593- 137 <br /> Xylene,total C4030384-08 60 0 1 ugJL 1 945 92 2 25 59 3- 144 <br /> GTEL Concord,CA Page 5 <br /> IGTELC4030403DOIC <br /> ENV I R <br /> LAAORAT0RIES <br /> INC. <br />