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STLSubmission 2005-04-0633 <br /> Fuel Oxygenates by 8260B <br /> Treadwell & Rollo-San Francisco <br /> Attn David Dixon <br /> 555 Montgomery Street Suite 1300 , <br /> San Francisco, CA 94111-2554 <br /> Phone (415) 955-9040 Fax (415) 955-9041 <br /> Project 2597 10 Received 04/20/2005 14 00 ' <br /> Carando <br /> Batch QC Report <br /> Prep(s) 50306 Test(s) 82608 <br /> Matrix Spike ( MS 1 MSD) Water QC Batch #2005104125-02 64 <br /> MS/MSD Lab ID 2005-04-0699-008 , <br /> MS 2005104125-02 64-015 Extracted 04/25/2005 Analyzed 04/25/2005 22 15 <br /> Dilution 100 <br /> MSD 2005104125-02 64-037 Extracted 04/2512005 Analyzed 04/25/2005 22 37 <br /> Dilution 1 00 <br /> Compound Conc uglL Spk Level Recove % Limits% Fla s <br /> MS MSD Sample u /L MS MSD RPD Rec RPD MS MSD <br /> Methyl lert-butyl ether 194 186 ND 25 0 776 744 4 2 65-165 20 , <br /> Benzene 223 21 2 ND 250 892 848 51 69-129 20 <br /> Toluene 248 241 ND 250 99 2 964 29 70-130 20 <br /> Surrogate(s) ' <br /> 1,2-Dlchloroethane-d4 398 392 500 796 78 4 73-130 <br /> Toluene-d8 1462 462 500 1924 924 81-114 <br /> 1 <br /> Severn Trent Laboratories, Inc 0511 312005 09 04 ' <br /> STL San Francisco*1220 Quarry Lane Pleasanton,CA 94566 <br /> A part of S—m Trend Plc Tel 925 484 1919 Fax 925 484 1096*www std-mc com*CA DHS ELAP#2496 Page 5 of 6 <br />