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TLSubmission # 2004-04-0904 <br /> Gas/BTEX Fuel Oxygenates by 8260B <br /> TRC Alton Geoscience <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 04/28/2004 15 35 <br /> Conoco Phillips#01205 <br /> Site 16470 Cambridge St,Lathrop <br /> Batch QC Re ort <br /> Prep(s) 50306 Test(s) 8260FAB <br /> Laboratory Control Spike Water QC Batch#2004105110-1 B 64 <br /> LCS 2004/05/10-16 64-030 Extracted 05110/2004 Analyzed 05/10/2004 18 30 <br /> LCSD 2004105110-1 B 64-052 Extracted 05/10/2004 Analyzed 05/10/2004 18 52 <br /> Compound Conc uglL Exp Conc Recovery % RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Methyl tert-butyl ether(MTBE) 234 240 25 936 960 25 65-165 20 <br /> Benzene 222 23 8 25 88 8 952 7 0 69-129 20 <br /> Toluene 224 238 25 896 952 6 1 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 476 465 500 952 930 76-114 <br /> Toluene-d8 484 491 500 1968 1982 1 88-110 <br /> Severn Trent Laboratories, Inc 05/121200417 13 <br /> STL San Francisco•1220 Quarry Lane,Pleasanton,CA 94566 <br /> ApartmSev�m Trtrrt Ply Tel 925 484 1919 Fax 925 484 1096'www stl-inc corn'CA DHS FLAP#2496 Page 20 of 22 <br />