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STLSubmission#: 2004-04-0045 <br /> Gas/BTEX/MTBE by 8260B =>, <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: 1751 SEC550/551 Received: 04/01/2004 15:40 <br /> Conoco Philips Site#11195 <br /> Site: 16500 Louise, Lathrop, CA <br /> Batch QC Report <br /> Prep(s): 5030B Test(s): 82608 <br /> Laboratory Control Spike Water QC Batch#2004/04107-1B.64 <br /> LCS 2004104/07-1 B.64-043 Extracted: 04/07/2004 Analyzed: 04/07/2004 07:43 <br /> LCSD 2004104107-1 B,64-005 Extracted: 04/07/2004 Analyzed: 0410712004.08:05 <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Methyl tert-butyl ether(MTBE) 22,2 21.8 25 88.8 87.2 1.8 65-165 20 <br /> Benzene 23.1 22.6 25 92.4 90.4 2,2 69-129 20 ) <br /> Toluene 22.9 23.1 25 91.6 92.4 0.9 70-130 20 `s <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 451 429 500 90.2 85.8 76-114 <br /> Toluene-d8 479 470 500 95.8 94.0 88-110 <br /> Severn Trent Laboratories, Inc. 04/12/2004 <br /> STL San Francisco*1220 Quarry Lane,Pleasanton,CA 94566 <br /> A pad Plc of Severn Trent <br /> Tel 925 484 1919 Fax 925 484 1096'www.sti-inc.com'CA I]HS ELAP#2496 Page 6 of 8 <br />