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Submission #: 2002-05-0424 <br /> Gas/BTEXFuel Oxygenates by 8260B <br /> Batch QC report <br /> STL San Francis-:' <br /> Test Method: 82606 Prep Method: 50306 1220 Quarry Lane. <br /> Pleasanton,CA 94566 <br /> Laboratory Control Spike (LCS/LCSD) Water QC Batch# 2002106103-01.27 Tel 925 484 1919 <br /> LCS: 2002106103-01.27-004 Extracted: 06/03/2002 10:44 Analyzed. 06/03/2002 10:44 Fax 925 484 1496 <br /> www.stl-inc.com <br /> LCSD: 2002/06103-01.27-005 Extracted: 06/031200211:13 Analyzed: 06/031200211:13 www.chromalab.com <br /> CA DHS ELAP#2496 <br /> Compound Conc.[ug/L] Exp.Conc.[ug/L] Recovery RPD Ctrl.Limits(%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recover RPD LCS LCSD <br /> Methyl tert-butyl ether 19.6 16.6 25.0 25.0 78.4 66.4 16.6 65-165 20 <br /> Benzene 22,7 22.3 25.0 25.0 90.8 89.2 1.8 69-129 20 <br /> Toluene 24.9 24.5 25.0 25.0 99.6 98.0 1.6 70-130 20 <br /> Surrogate(s) <br /> 1,2-Dichloroelhane-d4 520 498 500 500 104.0 99.6 76-114 <br /> Toluene-d8 494 499 500 500 98.8 99.8 88-110 <br /> STL San Francisco is a part of Severn Trent Laboratories, Inc. Page 14 of 15 <br />