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r� <br /> Submission #: 2002-03-0551 <br /> Gas/BTEX by 8015M/8021 <br /> Batch QC Report <br /> ;> Test Method: 8021 B Prep Method: 5035 STL San Francisco <br /> 1220 Quarry Lane <br /> Pleasanton,CA 94566 <br /> Matrix Spike( MS I MSD ) Soil QC Batch#2002104/03-01.03 <br /> Tel 925 484 1919 <br /> Sample ID: MW-11-21.5 » MS Lab ID: 2002-03-0551-004 Fax 9254841096 <br /> MS: 2002104103-01.03-019 Extracted:04/03/2002 19:04 Analyzed: 04/03/200219:04 www,stl-inc.com <br /> www.chromalab.com <br /> Dilution: 1 <br /> CA DHS ELAP#1094 <br /> MSD: 2002104/03-01.03-020 Extracted:04/03/200219:35 Analyzed: 04103/200219:35 <br /> Dilution: 1 <br /> Compound Conc.[mg/K9] Exp.Conc. Re overt'[%] RPD Ctrl.Limits[%] Flags <br /> 1- MS MSD Sample MS MSD MS MSD [%] Recovery RPD MS MSD <br /> Benzene 0.0887 0.0863 NO 0.0988 0.0990 89.8 87.2 2.9 65-135 35 <br /> Toluene 0.0884 0.0862 ND 0.0988 0.0990 89.5 87.1 2.7 65-135 35 <br /> - Ethyl benzene 0,0893 0.0872 ND 0,0988 0.0990 90.4 88.1 2.6 65-135 35 <br /> Xylene(s) 0.265 0.259 ND 0.300 0.297 88.3 87.2 1.3 65-135 35 <br /> -: Surrogate(s) <br /> Trifluorotoluene 485 460 500 500 97.0 92.0 53-125 <br /> � 3 <br /> STL San Francisco is a part of Severn Trent Laboratories,Inc. Page 25 of 26 <br />