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t <br /> STLSubmission # 2004-01-0751 <br /> Fuel Oxygenates by 82606 <br /> ' Treadwell & Rollo-Orinda <br /> Attn Brian Moore <br /> 2 Theater Square, Suite 216 <br /> Orinda, CA 94563 <br /> ' Phone (925) 253-4980 Fax (925) 253-4985 <br /> Project 2597 10 Received 01/15/2004 <br /> Stockton_Carado Site <br /> Batch QC Re ort <br /> ' Prep(s) 50306 Test(s) 82609 <br /> Laboratory Control Spike Sod QC Batch#2004101129-01 69 <br /> ' LCS 2004101129-01 69-014 Extracted 01/29/2004 Analyzed 01/29/2004 08 14 <br /> LCSD 2004101129-01 69-033 Extracted 01/29/2004 Analyzed 01/29/2004 08 33 <br /> Compound Conc ug/Kg Exp Cone Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Methyl tert-butyl ether(MTBE) 579 538 500 1158 1076 73 65-165 20 <br /> Benzene 508 475 500 1016 950 6 7 69-129 20 <br /> Toluene 508 475 500 1016 950 6 7 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 459 463 500 91 8 926 70-121 <br /> Toluene d8 1479 481 500 958 1962 81-117 <br /> I <br /> I <br /> Severn Trent Laboratories Inc 01129120041605 <br /> ' STL San Francisco*1220 Quarry Lane Pleasanton,CA 94566 <br /> A pert of Se"m Trent Plc Tel 925 484 1919 Fax 925 484 1096*www stl-inc com*CA OHS ELAP*2496 Page 6 of 7 <br />