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Submission #: 2002-02-0493 <br /> Gas/BTEXFuel Oxygenates by 8260E <br /> ' Batch QC report <br /> STL San FrencE;co <br /> Test Method: 8260FAS Prep Method: 50308 1220 Quarry Lana <br /> Pleasanton,CA 94556 <br /> Laboratory Control Spike(LCS/LCSD) Water QC Batch#2002103/01-01.27 Tel 925 484 1919 <br /> LCS: 2002103/01-01.27-003 Extracted: 031011200210:25 Analyzed: 03/011200210:25 Fax 925 484 1096 <br /> www.sti-inc.com <br /> LCSD: 2002103101-01.27-004 Extracted: 03/01/2002 10:53 Analyzed: 03/01/2002 10:53 www.chromalab.com <br /> 1 CA DHS ELAP*1094 <br /> 1 Compound Conc.[ug/L] Exp.Conc.[ug/L] Recovery RPD Ctrl.Llmits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recover RPD LCS LCSD <br /> Benzene 20.2 19.9 25.0 25.0 80.8 79.6 11.5 69-129 20 <br /> Toluene 21.5 21.6 25.0 25.0 86.0 86.4 0.5 70-130 20 <br /> ' Methyl tett-butyl ether 21.9 20.9 25.0 25.0 87.6 83.6 4.7 65-165 20 <br /> Surrogate(s) <br /> 1,2-Dichioroethane-d4 520 509 500 500 104.0 101.8 76-114 <br /> Toluene-d8 493 491 500 500 98.6 98.2 88-110 <br /> 1 <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> STL San Francisco is a part of Severn Trent Laboratories.Inc. Page 13 of 15 <br />