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I <br /> Submission: 2005-04-0633 <br /> STL <br /> Fuel Oxygenates by 82608 <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): 50306 Test(s):8260B <br /> Matrix Spike (MS/MSD) Water QC Batch#2005/04/25-02.64 <br /> MS/MSD Lab ID: 2005-04-0699-008 <br /> MS: 2005/04/25-02.64-015 .Extracted:04/25/2005 Analyzed: 04/25/2005 22:15 <br /> Dilution: 1.00 <br /> MSD: 2005/04/25-02.64-037 Extracted:04/25/2005 Analyzed: 04/25/2005 22:37 <br /> Dilution: 1.00 <br /> Compound Conc. ug/L S k.Le el Recove % Limits% Flags <br /> MS MSD Sample ug/L MS MSD 'RPD Rec. RPD MS MSD <br /> Methyl tert-butyl ether 19.4 18.6 ND 25.0 77.6 74.4 4.2 65-165 20 <br /> Benzene 22.3 21.2 ND 25.0 89.2 84.8 5.1 69-129 20 <br /> Toluene 24.8 24.1 ND 25.0 99.2 96.4 2.9 70-130 20 <br /> Surrogates) <br /> 1,2-Dichloroethane-d4 398 392 500 79.6 78.4 73-130 <br /> Toluene-d8 1462 1462 1 1 500 92.4 92.4 1 81-114 <br /> ISI <br /> Severn Trent Laboratories, Inc. 05/13/200509:04 <br /> STL San Francisco*1220 Quarry Lane,Pleasanton,CA 94566 <br /> A part of Sevem Trent Plc Tel 925 484 1919 Fax 925 484 1096*www.stl-inc.com*CA DHS FLAP#2496 Page 5 of 6 <br />