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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: 04/20/200514:00 <br /> Carando <br /> Batch QC Report <br /> Prep(s): 50308 Test(s): 8260B <br /> Method Blank Water QC Batch#2005/04/25-02.64 <br /> MB:2005/04/25-02.64-026 Date Extracted: 04/25/2005,l 8:26 <br /> Compound Conc. RL Unit Analyzed Flag <br /> Gasoline ND 50 ug/L 04/25/200518:26 <br /> Methyl tert-butyl ether(MTBE) ND 0.5 ug/L 04/25/2005 18:26 <br /> Benzene ND 0.5 ug/L 04/25/200518:26 <br /> Toluene ND 0.5 ug/L 04/25/200518:26 <br /> Ethylbenzene ND 0.5 ug/L 04/25/200518:26 <br /> Total xylenes ND 1.0 ug/L 04/25/2005 18:26 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 113.4 73-130 % 04/25/200518:26 <br /> Toluene-d8 93.2 81-114 % 04/25/200518:26 <br /> Severn Trent Laboratories, Inc. 05/13/200509:04 <br /> STL San Francisco*1220 Quarry Lane,Pleasanton,CA 94566 <br /> A pan of Severn Trent Plc Tel 925 484 1919 Fax 925 484 1096*www.sti-inc.com*CA DHS ELAP#2496 Page 3 of 6 <br />