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nq ) <br /> Suhmissian # 2004-05-0856 <br /> Em "', STL I <br /> Gas/BTEX Fuel Oxygenates by 82608 <br /> TRC Alton Geoscience <br /> Attn An1u Farfan <br /> 21 Technology Drive <br /> Irvine, CA 92718 <br /> Phone (949) 341-7440 Fax (949) 753-0111 <br /> Project 41050001 FA20 Received 05/24/2004 11 50 <br /> Conoco Phillips# 11192 <br /> Site 1403 Country Club Blvd, Stockton <br /> Batch QC Report <br /> Prep(s) 5030E Test(s) 8260FAB <br /> Laboratory Control Spike Water QC Batch #2004106103-2B 66 <br /> LCS 2004106103-2B 66-017 Extracted 06/03/2004 Analyzed 06/03/2004 17 17 <br /> LCSD 2004/06/03-2B 66-041 Extracted 06/03/2004 Analyzed 06/03/2004 17 41 <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) 283 269 25 1132 1076 51 65-165 20 <br /> Benzene 303 281 25 1212 1124 75 69-129 20 <br /> Toluene 29 6 258 25 1184 1032 137 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-l4 495 517 500 990 1034 72-128 <br /> Toluene-d8 519 1511 1500 1038 11022 80-113 <br /> Severn Trent Laboratories, Inc G6107/2004 16 04 <br /> STL San Francisco"1220 Quarry Lane Pleasanton CA 94566 <br /> Apart of Severn Trent Plc Tel 925 484 1919 Fax 925 484 1095*www stl-inc corn'CA DHS ELAP*2496 Page 16 of 19 <br />