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G1 �t <br /> g; Submission# 2004-03-0365 <br /> STL GasIBTEX Fuel Oxygenates by 82608 • <br /> TRC Alton Geoscience <br /> Attn Anlu Farfan_ _ <br /> 21 Technology Drive <br /> Irvine, CA 92718 <br /> Phone (949) 341-7440 Fax (949) 753-0111 <br /> Project 41050001 FA20 Received 03/10/2004 17 20 <br /> Conoco Phillips#6981 <br /> Site 4707 Pacific Ave Stockton <br /> Batch QC Report <br /> Prep(s) 5030B Test(s) 8260FAB <br /> Laboratory Control Spike Water QC Batch ##2004103118-28 66 <br /> LCS 2004103118-2B 66-042 Extracted 03/18/2004 Analyzed 03/18/2004 17 42 <br /> LCSD 2004103118-213 66-006 Extracted 03/18/2004 Analyzed 03/18/2004 18 06 <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 9 248 25 956 992 37 65-165 20 <br /> Benzene 252 26 0 25 1008 1040 31 69-129 20 <br /> Toluene 246 25 4 25 984 1016 32 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 493 529 500 98 6 1058 76-114 <br /> Toluene-d8 1512 512 500 1024 1024 1 88-110 <br /> Severn Trent Laboratories, Inc 0312412ao4 16 56 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton CA 94566 <br /> A part of Sevem Trent Plc Tel 925 484 1 91 9 Fax 925 484 1 696"www stl-inc com 'CA DMS ELAP#2496 Page 14 of 16 <br />