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STL <br /> Submission # 2004-02-0755 <br /> GaslBTEX duel Oxygenates by 82606 <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 02/24/2004 16 25 <br /> Conoco Phillips# 11192 <br /> Site 1403 Country Club Blvd Stockton <br /> Batch QC Report <br /> Prep(s) 50306 Test(s) 8260FAB <br /> Laboratory Control Spike Water QC Batch#2004103102-2A 64 <br /> LCS 2004103102-2A 64-009 Extracted 03/0212004 Analyzed 03/02/2004 18 09 <br /> LCSD 2004103102-2A 64-032 Extracted 03/0212004 Analyzed 03/02/2004 18 32 <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) 226 230 25 904 920 1 8 65-165 20 <br /> Benzene 228 232 25 91 2 928 1 7 69-129 20 <br /> Toluene 250 245 25 1000 98 0 2 0 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 417 419 500 834 838 76-114 <br /> Toluene-d8 504 1490 1 500 11008 980 88-110 <br /> Severn Trent Laboratories, Inc 03/08/2004 16 31 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton CA 94566 <br /> A Part a!Severn Trent Pk Tel 925 484 1919 Fax 925 484 1096'www stl-inc cam"CA DHS FLAP#2496 Page 10 of 13 <br />