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i <br /> 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): 50306 Test(s):8260B <br /> Matrix Spike(MS/MSD) Soil QC Batch#2005/04/24-01.62 <br /> MS/MSD Lab ID: 2005-04-0634-003 <br /> i <br /> MS: 2005/04/24-01.62-011 Extracted:04/24/2005 Analyzed: 04/24/200511:11 <br /> Dilution: 1.00 , <br /> MSD: 2005/04/24-01.62-037 Extracted:04/24/2005 Analyzed: 04/24/200511:37 <br /> Dilution: 1.00 <br /> Compound Conc.. ug/Kg, Recovery k.Level Recove % Limits% Flags <br /> MS MSD Sample ug/Kg MS MSD ° RPD Rec, RPD MS MSD <br /> Methyl tert-butyl ether 51.6 52.0 ND 45.3 113.9 109.5 3.9 65-165 20 <br /> Benzene 48.8 51.7 ND 45.3 107.7 108.8 1.0 69-129 20 <br /> Toluene 51.0 53.7 ND 45.3 112.6 113.1 0.4 70-130 20 <br /> Surrogate(s) <br /> 1,2-Dichloroethane-d4 503 488 500 100.6 97.6 72-124 <br /> Toluene-d8 542 542 500 108.4 108.4 75-116 <br /> t I <br /> Severn Trent Laboratories, Inc. 05/04/200513:06 <br /> STL'San Francisco*1220 Quarry Lane,Pleasanton,CA 94566 <br /> A pan of Severn Trent Plc Tel 925 484 1919 Fax 925 484 1096*www.stl-inc.com*CA DHS ELAP#2496 Page 13 of 15 <br />