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5 , b <br /> Client Number 6NC01ARC01 <br /> Facility Number 434 <br /> Arco Reoresentatwe Chuck Carmel <br /> Work Order Number C3-110032 <br /> QC Check Sample Results <br /> Date of Expected <br /> Analyte Source Analysis Value Units Recoverya, % <br /> Modified EPA 8020 <br /> Benzene Supelco 1 09/27/93 500 ug/L 109 <br /> Toluene Supelco 09/27/93 500 ug/L 103 <br /> Ethylbenzene Supelco 09/27/93 .500 ug/L 104 <br /> Xylene, total Supelco 09/27/93 150 ug/L 105 <br /> QC Sample and Sample Duplicate Results <br /> Matrix Air <br /> • Sample <br /> Sample Date of Sample Duplicate Control <br /> Analyte ID Analysis Units Results Results RPD, % Limits <br /> Modified EPA 8020 <br /> Benzene C3110035 01 11/03/93 ug/L 0 805 0 925 139 53 <br /> Toluene 03110035-01 11/03/93 ug/L 139 153 96 39 <br /> Ethylbenzene C3110035-01 11/03/93 ug/L <05 0 552 NA 33 <br /> Xylene, total C3110035 01 1 1 03/93 ug L 448 560 222 41 <br /> NA = Not Applicable <br /> 1 Concord CA <br /> 031MGTEL <br /> 03110032 BGA <br /> ENY I R ON M E NTA l <br /> LAOORATORIE5 INC <br />