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T ' <br /> ® Submission 2004-08-0169 <br /> STL <br /> Gas16TEX Fuel Oxygenates by $260B <br /> TRC Alton Geoscience- Irvine <br /> Attn Anju Farfan <br /> 21 Technology Drive <br /> Irvine, CA 92716 <br /> Phone (949) 341-7440 Fax (949) 753-0111 <br /> Project 41050001 FA20 Received 08/05/2004 18 30 <br /> Conoco Phillips#08671 <br /> Site 8606 Thornton Rd , Stockton <br /> Batch QC Report <br /> Prep(s) 50306 Test(s) 8260FAB <br /> Laboratory Control Spike Water QC Batch#2004/08112-18 66 <br /> LCS 2004/08112-1 B 66-004 Extracted 08/12/2004 Analyzed 08/12/2004 07 04 <br /> LCSD 2004108112-1 B 66-027 Extracted 08/12/2004 Analyzed 08/12/2004 07 27 <br /> Compound Conc ug/L Exp Conc Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS I LCSD <br /> Methyl tert-butyl ether(MTBE) 23 2 214 25 928 85 6 81 65-165 20 <br /> Benzene 232 23 7 25 928 948 2 1 69-129 20 <br /> Toluene 249 250 25 996 1000 0 4 70-130 20 <br /> Surrogates(s) <br /> 1 2-Dichloroethane-d4 446 432 500 892 864 72-128 <br /> Toluene-d8 504 489 500 1 1008 1978 1 1 80-113 <br /> Severn Trent Laboratories, Inc 08/17/2004 13 30 <br /> STL San Francisco.1220 Quarry Lane,Pleasanton,CA 94566 <br /> A;W of Se—Tr"Pk Tel 925 484 1919 Fax 925 04 1096'www sti-inc com"CA QHS ELAP#2496 Page 16 of 18 <br />