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al f1 <br /> a Submission 2004-08-0169 <br /> i <br /> Gas/BTEX Fuel Oxygenates by 8260B <br /> TRC Alton Geoscience- Irvine <br /> Attn Anju Farfan <br /> 21 Technology Drive <br /> Irvine, CA 92718 <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 Re ort <br /> Prep(s) 5030B Test(s) 8260FAB <br /> Laboratory Control Spike Water QC Batch #2004108116-2A 64 <br /> LCS 2004108116-2A 64-005 Extracted 08/16/2004 Analyzed 08/16/2004 19 05 <br /> LCSD 2004108116-2A 64-041 Extracted 08/16/2004 Analyzed 08/16/2004 19 41 <br /> Compound Conc uglL Exp Conc Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Methyl tent-butyl ether(MTBE) 254 248 25 1016 992 24 65-165 20 <br /> Benzene 238 23 3 25 952 932 2 1 69-129 20 <br /> Toluene 24 4 25 5 25 97 6 1020 44 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 500 481 500 1000 962 72-128 <br /> Toluene-d8 503 490 500 11006 1980 1 1 80-113 <br /> Severn Trent Laboratories, Inc 08/17/200413 300 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 <br /> Apan W Severn Trent Plc Tel 925 484 1919 Fax 925 484 1096'www stl-inc com•CA DHS ELAP#2496 Page 17 of 18 <br />