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i <br /> �® STL Submission: 2005-04-0633 <br /> Gas/BTEXFuel Oxygenates by 8260B (High Level) <br /> Treadwell& Rollo-San Francisco <br /> Attn.:David Dixon <br /> 555 Montgomery Street.Suite 1300 <br /> San Francisco, CA 94111-2554 <br /> Phone: (415)955-9040 Fax: (415)955-9041 <br /> Project: 2597.10 Received:04/20/2005 14:00 <br /> Carando <br /> Batch QC Report <br /> Prep(s): 50308 Test(s): 8260B <br /> it <br /> Laboratory Control Spike Soil QC Batch#2005/05/01-03.69 <br /> jt <br /> LCS 2005/05/01-03.69-018 Extracted: 05/03/2005 Analyzed: 05/03/200512:18 <br /> LCSD 2005/05/01-03.69-038 Extracted:05/03/2005 Analyzed: 05/03/200512:38 <br /> Compound Conc. ug/Kg Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD %: _ Rec. RPD LCS LCSD <br /> Benzene 7290 8750 10000 72.9 87.5 18.2 69-129 20 <br /> Toluene 8400 8930 10000 84.0 89.3 6.1 70-130 20 <br /> Methyl tert-butyl ether(MTBE) 8760 9870 10000 87.6 98.7 11.9 65-165 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 253 252 250 101.2 100.8 53-129 <br /> Toluene-d8 253 259 250 101.2 103.6 47-136 <br /> Severn Trent Laboratories, Inc. 05/04/2005 13:15 <br /> STL San Francisco*1220 Quarry Lane,Pleasanton,CA 94566 <br /> A part of5ewm hen[Plc Tel 925 484 1919 Fax 925 484 1096*www.stl-inc.com*CA DHS ELAP#2496 Page 5 of 6 <br />