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k <br /> ' I <br /> STLSubmission#: 2004-05-0855 f <br /> Gas/BTEX Fuel Oxygenates by 82608 <br /> TRC Alton Geoscience <br /> Attn.: Anju Farfan <br /> 21 Technology Drive <br /> Irvine, CA 92718 <br /> Phone: (949) 341-7440 Fax: (949) 753-0111 <br /> Project: 41050001 FA20 Received: 05/24/2004 11:50 f <br /> Conoco Phillips# 11195 I <br /> Site: 16500 South Interstate 5 Lathrop 1 <br /> f <br /> F <br /> Batch QC Report <br /> Prep(s): 5030B Test(s): 8260FAB <br /> Matrix Spike(MS!MSD ) Water QC Batch#2004106103-01.64 <br /> MW-10 » MS Lab ID: 2004-05-0855-001 <br /> MS: 2004/06/03-01-64-048 Extracted: 06/03/2004 Analyzed: 06/03/2004 21:48 i <br /> Dilution: 1.00 <br /> MSD: 2004106103-01.64-010 Extracted: 06/03/2004 Analyzed: 06/03/2004 22:10 <br /> F _r_= Dilution: 1.00 <br /> Compound Conc. ug1L Spk.Level Recovery% Limits% Flags <br /> MS MSO Sample uglL MS MSD RPD Rec. RPD MS MSD <br /> Benzene 25.2 25.8 ND 25,0 100.8 103.2 2.4 69-129 20 <br /> Toluene 27.5 27.2 ND 25.0 110.0 108.8 1.1 70-130 20 <br /> Methyl lert-butyl ether 28.3 29.3 0.978 25.0 109.3 113.3 3.6 65-165 20 <br /> Surrogate(s) <br /> 1,2-Dichloroethane-d4 472 501 500 94.4 100.1 72-128 <br /> Toluene-d8 527 518 500 105.3 103.6 80-113 <br /> Severn Trent Laboratories, Inc. 06!071200413:05 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 <br /> A pal of Severn Trent Pie Tel 925 484 1919 Fax 925 484 1 096"www.stl-inc.com'CA DHS ELAP*2496 Page 30 of 31 <br />