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STLSubmission#: 2004-03-0073 <br /> Gas/BTEXIMTBE 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): 5030B Test(s): 8260B <br /> Laboratory Control Spike Water QC Batch#20.04103110-1C.65 <br /> LCS 2004103110-1 C.65-053 Extracted: 03/1012004 Analyzed:03/10/2004 08:53 <br /> LCSD 2004103110-1 C.65-018 Extracted: 03/10/2004 Analyzed: 03/10/2004 09:16 <br /> Compound Conc. ug/L Exp.ConcJ Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. I RPD LCS LCSD <br /> Methyl tent-butyl ether(MTBE) 24.1 24.7 25 96.4 98.8 2.5 65-165 20 <br /> Benzene 24,1 25.3 25 96.4 101.2 4.9 69-129 20 <br /> Toluene 25,3 26.2 25 101.2 104.8 3.5 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 418 414 500 83.6 82.8 76-114 <br /> Toluene-d8 459 488 500 91.8 97.6 1 88-110 <br /> Severn Trent Laboratories, Inc, 03/1512004 16:26 <br /> STL San Francisco*1220 Quarry Lane,Pleasanton,CA 94566 <br /> A part of sevem Trent Plc Tel 925 484 1919 Fax 925 484 1096*www.sti-inc.com*CA DHS FLAP#2496 Page 8 of e <br />