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Submission #: 2002-05-0424 <br /> Gas/BTEXFuel Oxygenates by 8260B <br /> Batch QC report <br /> STL San Franclsd '—'-:-3 <br /> Test Method: 8260FAB Prep Method: 5030B 1220 Quarry Lane <br /> Pleasanton,CA 94566 <br /> Laboratory Control Spike (LCSILCSD) Water QC Batch # 2002105131-01.27 Tel 925484 1919 <br /> LCS: 2002105131-01.27-003 Extracted: 05/3112002 10:48 Analyzed: 05/31/2002 10:48 Fax 925 484 1096 <br /> www.sti-inc.com <br /> LCSD: 2002105131-01.27-004 Extracted: 051311200211:18 Analyzed: 051311200211:18 www.chromalab.com <br /> CA DHS ELAP#2496 <br /> Compound Conc.[ug/L] Exp.Conc.[ug1L] Recovery RPD Ctrl.Limits Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recover RPD LCS LCSD <br /> Benzene 23.7 23.0 25.0 25.0 94.8 92.0 3.0 69-129 20 <br /> Toluene 25.7 24.8 25.0 25.0 102.8 99.2 3.6 70-130 20 <br /> Methyl tert-butyl ether 21.9 19.8 25.0 25.0 87.6 79.2 10.1 65-165 20 <br /> Surrogate(s) <br /> 1,2-Dichloroethane-d4 518 527 500 500 103.6 105.4 76-114 <br /> Toluene-d8 506 509 500 500 101.2 101.8 88-110 <br /> STL San Francisco is a part of Severn Trent Laboratories, Inc. Page 12 of 14 <br />