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STLSubmission: 2005-04-0633 <br /> Fuel Oxygenates by 8260B <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): 5030B Test(s): 8260B <br /> Laboratory Control Spike Soil' QC Batch#2005/04/24-01.62 <br /> LCS 2005/04/24-01.62-018 Extracted:�04/24/2005 Analyzed:04/24/2005 08:18 <br /> LCSD <br /> Compound Cone. ug/Kg Exp.Conc. Recovery% RPD CtrLLimits% Flags <br /> LCS LCSD LCS . LCSD % _ Rec. I RPD LCS LCSD <br /> Methyl tert-butyl ether(MTBE) 56.1 50.0 112.2 65-165 20 <br /> Benzene 53.2 50.0 106.4 69-129 20 <br /> Toluene 54.3 50.0 108.6 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 498 500 99.6 72-124 <br /> Toluene-d8 511 500 102.2 75-116 <br /> Severn Trent Laboratories, Inc. 05/04/200513:06 <br /> STL San Francisco*1220 Quarry Lane,Pleasanton,CA 94566 <br /> A part of Sevem Tent Plc Tel 925 484 1919 Fax 925 484 1096*www.sti-inc.com*CA DHS ELAP#2496 Page 11 of 15 <br />