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Submission#: 2005-04-0633 <br /> Fuel Oxygenates by 82608 • ,®• <br /> Treadwell&Rollo-San Francisco STL San Francisco <br /> Attn.: David Dixon Plea Quarry Lane <br /> 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: 04/20/200514:00 www.chromalab.com <br /> Carando <br /> CA DHS ELAP#2496 <br /> Batch QC Report <br /> Prep(s): 50308 Test(s):8260B <br /> Matrix Spike(MS/MSD) Water QC Batch#2005/04/30-01.64 <br /> MS/MSD Lab ID: .2005-04-0640-005 <br /> MS: 2005/04/30-01.64-052 Extracted:04/30/2005 Analized: 04/30/200514:52 <br /> Dilution: 1.00 <br /> MSD: 2005/04/30-01.64-014 Extracted:04./30/2005 Analized: 04/30/200515:14 <br /> Dilution: 1.00 <br /> Compound Conc. ug/L S ((.Leve Recovery% Limits% Flags <br /> MS MSD Sample ug/L. MS MSD RPD Rec. RPD MS MSD <br /> Methyl tert-butyl ether 1050 1090 1080 25.0 -120.0 40.0 -400 65-165 20 M3 M3,R1 <br /> 'Benzene 144 172 124 25.0 80.0.. 192.0 82.4 69-129 20 M3 M3,R1 <br /> Toluene 38.6 43.6 9.59 25.0 116.0 136.0 15.9 70-130 20 M4 <br /> Surrogate(s) <br /> 1,2-Dichloroethane-d4 426 420 500 85.2 84.0 73-130 <br /> Toluene-d8 490 492 500 98.0 98.4 81-114 <br /> 05/13/2005 09:05 STL San Francisco is part of Severn Trent Laboratories,Inc. Page 5 of 6 <br />