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QC Acceptability Limits <br /> QC Check Duplicate <br /> Analyte Sample Air Matrix <br /> Recovery Sample Spike <br /> N RPD Recovery <br /> N N <br /> Modified EPA 8020: <br /> Benzene --- 38 --- <br /> Toluene --- 34 <br /> Ethylbenzene --- 48 --- <br /> Xylene,total --- 34 --- <br /> Modified EPA 8015 <br /> Gasoline -- --- <br /> GTEL Concord,CA Page 3 of 3 <br /> March, 1992 <br /> CHEVQCLSET EGTEL� <br /> R <br /> LABORATORIES INC <br />