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Submission# 2002-06-0146 <br /> Gas/BTEXFuei Oxygenates by 8260B ff in-T111101 Lei <br /> Gettler Ryan STL San Francisco <br /> Attn Deanna Harding 1220 Quarry Lane <br /> 6747 Sierra Court Suite J Pleasanton,CA 94566 <br /> Dublin, CA 94568 Tel (925)484-1919 <br /> Phone (925) 551-7444 Fax (925) 551-7899 Fax (925)484-1096 <br /> wwwProject 6981 Received 06/10/2002 16 41 www chrorsti-incorn <br /> TOSCO www chromalab oom <br /> Site 4707 Pacific Avenue CA DHS ELAN 2496 <br /> Stockton, CA <br /> Batch QC ReRort <br /> Prep(s) 6030B Test(s) 8260B <br /> Laboratory Control Spike Water QC Batch#2002106111-01.27 <br /> LCS 2002/06/11-0127-004 Extracted 0611.1/2002 Ana9yzeid 0'6111/2002 10 22 <br /> LCSD 2002/06111-01 27 005 Extracted 06111/2002 Analyzed 06/1112002 10 44 <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) 207 203 250 828 81 2 2 0 65-165 20 <br /> Benzene 244 239 25 0 976 956 2 1 69-129 20 <br /> Toluene 250 24 7 250 1000 988 1 2 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 506 512 500 1012 1024 76-114 <br /> Toluene-d8 493 504 500 986 1008 88-110 <br /> 08/01/2002 15 57 STL San Francisco is part of Severn Trent Laboratories, Inc Page 22 of 26 <br />