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STLSubmission# 2004-03-0072 <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 Conoco Philips Site # 5886 Received 03/02/2004 17 40 <br /> Site 2701 West March Lane, Stockton, CA <br /> Batch QC Report <br /> Prep(s) 5030E Test(s) 8260B <br /> Laboratory Control Spike Water QC Batch#2004103109-2A 66 <br /> LCS 2004103109-2A 66-040 Extracted 03/09/2004 Analyzed 03/09/2004 17 40 <br /> LCSD 2004103109-2A 66-004 Extracted 03/09/2004 Analyzed 03/09/2004 18 04 <br /> Compound Conc ug/L Exp Conc. Recovery% RPDJ Ctrl Limits %4 Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS I LCSD <br /> Methyl tent-butyl ether(MTBE) 243 21 4 25 972 85 6 12 7 65-165 20 <br /> Benzene 244 224 25 976 89 6 85 69-129 20 <br /> Toluene 259 23 3 25 1036 93 2 106 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 484 473 500 968 946 76-114 <br /> Toluene-d8 522 512 500 11044 11024 88-110 <br /> Severn Trent Laboratories, Inc 03/15/2004 13 28 <br /> STL San Francisco' 1220 Quarry Lane Pleasanton CA 94566 <br /> A pan of Severn Trent p. Tel 925 484 1919 Fax 925 484 1096'www stl-inc com-CA DHS ELAP#2496 Page 7 of 9 <br />