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ST <br /> TSubmission#: 2003-11-0887 <br /> L <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: 11/25/2003 15:00 <br /> Conoco Phillips#11195 <br /> Site: 16500 South Interstate 5, Lathrop <br /> Batch QC Report . <br /> Prep(s): 5030B Test(s)'82608 <br /> Matrix Spike ( MS 1 MSD ): Water QC Batch#2003112103-01.68' <br /> MW-10 » NfS Lab 1D:. 2003-11-0887 004 <br /> MS` 2003/12/03-01.68-058 Extracted; 1.2103/2003 Analyzed: 1210312003-1.6:58 <br /> Dilution: 1.00; <br /> MSD: 2003/12/03-01:68.-016 Extracted::12103/2003 Analyzed: 12/031200317:16 <br /> Dilution: 1.00 <br /> Compound Conc. ug/L Spk.Level Recove ry% Limits% Flags <br /> MS MSD Sample ug/L MS MSD RPD Rec. RPD MS MSD <br /> Benzene 22.5 22,0 ND 25.0 90.0 88.0 2.2 69-129 20 <br /> Toluene 24.1 21.9 0.690 25.0 93.6 84,8 9.9 70-130 20 <br /> Methyl tent-butyl ether 32.7 27.5 3.46 25.0 117.0 96.2 19,5 65-165 20 <br /> Surrogates) <br /> 1,2-Dichloroethane-d4 559 518 500 111.8 103.6 76-114 <br /> Toiuene-d8 481 480 500 96.2 96.0 88-110 <br /> Severn Trent Laboratories, Inc. 12/1112603 17:29 <br /> STL San Francisco*1220 Quarry Lane, Pleasanton,CA 94566 <br /> A Pal of5"ern TremPt Tel 925 484 1919 Fax 925 484 1096*www.stl-inc.com*CA DHS ELAP#2496 Page 28 of 30 <br />