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Submission# 2003-10-0407 <br /> i Gas/BTEX Fuel Oxygenates by 82608 <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 41050001FA20 Received 10/09/2003 15 25 <br /> Conoco Phillips #4409 <br /> Site 1502 N EI Dorado Street <br /> Batch QC Re ort <br /> Prep(s) 5030B Test(s), 8260FA13 <br /> Laboratory Control Spike Water QC Batch#2003110129-02.68 <br /> LCS 2403110/21-02 68-055 Extracted 10/21/2003 Analyzed 10/2112003 20 55 <br /> LCSD 2003/10/21-02 68-017 Extracted 10/2112003 Analyzed 10121/2003 21,17 <br /> Compound Conc ug/L. Exp Conc Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Benzene 236 235 25 0 94 4 940 04 69-129 20 <br /> Toluene 24 2 240 25 0 968 960 0 8 70-130 20 <br /> Methyl tert-butyl ether(MTBE) 25 0 231 25 0 1000 924 79 65-165 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 510 486 500 1020 972 76-114 <br /> Toluene-d8 497 523 500 99 4 1046 88-110 <br /> Severn Trent Laboratories, Inc 01/08/2004 13 21 <br /> STL San Francisco" 1220 Quany Lane Pleasanton CA 94566 <br /> AW Sevum TrmlPIG Tel 925 484 1919 Fax 925 484 1096`www stl-mc corn`CA DNS EIRP#2496 Page 11 of 14 <br />