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A � <br /> Submission#: 2005-04-0633 ' <br /> Fuel Oxygenates by 8260B , <br /> Treadwell& Rollo-San Francisco STL San Francisco <br /> 1220 Quarry Lane <br /> Attn.: David Dixon Pleasanton,CA 94566 <br /> 555 Montgomery Street. Suite 1300 <br /> San Francisco, CA 94111-2554 Tel:(925)484-1919 <br /> Phone: (415)955-9040 Fax: (415),955-9041 Fax:(925)484-1096 <br /> www.stl-inc.com <br /> Project: 2597.10 Received: 04/20/2005.14:00 www,chromalab.com <br /> Carando <br /> CA DHS ELAP#2496 <br /> Batch QC Report <br /> Prep(s): 50306 Test(s):8260B <br /> Laboratory Control Spike Water QC Batch#2005/04/30-01.64 <br /> LCS 2005/04/30-01.64-039 Extracted: 04/30/2005 Analyzed: 04/30/2005 09:39 <br /> LCSD <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Methyl tert-butyl ether(MTBE) 24.1 25.0 96.4 65-165 20 <br /> Benzene 30.5 25.0 122.0 69-129 20 <br /> Toluene 30.6 25:0 122.4 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 416 500 83.2 73-130 <br /> Toluene-d8 489 500 97.8 81-114 <br /> 05/13/2005 09:05 STL San Francisco is part of Severn Trent Laboratories,Inc. Page 4 of 6 <br />