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STLSubmission#: 2004-05-0855 <br /> Gas/BTEX Fuel Oxygenates by 8260B <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 <br /> Conoco Phillips# 11195 <br /> Site: 16500 South Interstate 5 Lathrop <br /> Batch QC Report <br /> Prep(s). 50306 Test(s): 8260FAB <br /> Laboratory Control Spike Water QC Batch#2004106103-09.64 <br /> LCS 2004106103-01.64-015 Extracted: 06/03/2004 Analyzed: 06103/200414:15 <br /> LCSD 2004106103-01.64-038 Extracted: 06/03/2004 Analyzed: 06/03/200414:38 <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> f. Benzene 24.7 26.4 25.0 98.8 105.6 6.7 69-129 20 <br /> Toluene 26.8 28.0 25.0 107.2 112.0 4.4 70-130 20 <br /> Methyl tert-butyl ether(MTBE) 26.3 27.5 25.0 105.2 110.0 4.5 65-165 20 <br /> Surrogafes(s) <br /> 1,2-Dichloroethane-d4 473 474 500 94.6 94.8 72-128 <br /> Toluene-d8 516 526 500 103.2 105.2 80-113 <br /> Severn Trent Laboratories, Inc. 06107/200413:05 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 <br /> Apart of Severn Tient Plc Tel 925 484 1919 Fax 925 484 1096'www.sti-inc.com"CA DHS ELAP#2496 Page 26 of 31 <br />