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-y: <br /> - <br /> Submission #: 2001-12-0298 <br /> �. Gas/BTEX by 8015M/8021 <br /> V Batch QC report <br /> STL Chromalab <br /> Test Method: 8021 B Prep Method: 5030 1220 Quarry Lane <br /> Pleasanton,CA 94566 <br /> F <br /> Laboratory Control Spike(LCS/LCSD) Water QC Batch#2001112121-01.05 Tel 925 4841919 <br /> Fax 925 484 1096 <br /> LCS: 2001/12121-01.05-005 Extracted: 12/21/200109:12 Analyzed: 12/21/200109:12 www.stl-inc.com <br /> LCSD: 2001/12121-01.05-006 Extracted: 12/21/200109:44 Analyzed: 12/21/200109:44 www.chromalab.com <br /> CA DHS ELAP#1094 <br /> Compound Conc.(ug/L] Exp.Conc.(ug/L] Recovery[%] RPD Ctrl.Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD <br /> Benzene 92.9 86.9 100.0 100.0 92.9 86.9 6.7 77-123 20 <br /> Toluene 84.3 79.8 100.0 100.0 84.3 79.8 5.5 78-122 20 <br /> Ethyl benzene 89.6 84.4 100.0 100.0 89.6 84.4 6.0 70-130 20 <br /> Xylene(s) 266 249 300 300 88.7 83.0 6.6 75-125 20 <br /> Surrogate(s) <br /> Trifluorotoluene 449 436 500 500 89.8 87.2 58-124 <br /> l V <br /> i <br /> i <br /> V <br /> STL Chromalab is a part of Sever Trent Laboratories,Inc. Page 6 of 7 <br />