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STLSubmission#: 2004-03-0073 <br /> Gas/BTEX/MTBE by 82608 <br /> SECOR-Sacramento <br /> Attn.: Amy Draffan <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> Phone: (916) 861-0400 Fax: (916)861-0430 <br /> Project: Conoco Philips Site# 11195 Received: 03/02/2004 17:40 <br /> Site: 16500 Louise Ave, Stockton <br /> Batch QC Report _ <br /> Prep(s): 50308 Test(s): 8260B <br /> Laboratory Control Spike Water QC Batch#200.41.03111 A A.62 <br /> LCS 2004/03/1 1-1A.62-030 Extracted: 03/11/2004 Analyzed: 03/11/2004.:09:30. <br /> LCSD 2004103111-1A.62-052 Extracted: 03/11/2004 Analyzed: 0311112004.09`.52 <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPDJ Ctrl.Limlts% Flags <br /> LCS LCSD LCS LCSD % Rec. I RPD LCS LCSD <br /> Methyl tert-butyl ether(MTBE) 27.2 23.4 25 108.8 93.6 15.0 65-165 20 <br /> Benzene 22.0 21,9 25 88.0 87.6 0.5 69-129 20 <br /> Toluene 23.2 23.0 25 92.8 92.0 0.9 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 511 485 500 102.2 97.0 76-114 r` <br /> Toluene-d8 478 494 1500 95.6 198.8 1 1 88-1101 1 <br /> Severn Trent Laboratories, Inc. 03/15/2004 .- <br /> STL San Francisco'1220 Quarry Lane,Pleasanton, CA 94566 <br /> Apad of Severn Tient Plc Tel 925 484 1919 Fax 925 484 1096*www.su-inc.com*CA DHS ELAP#2496 Page 7 of 8 <br />