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STLSubmission : 2005-04-0622 <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. 11 Received : 04/20/2005 14:00 <br /> 130 N Hunter St. <br /> Batch QC Report <br /> Prep(s): 50308 Test(s): 82608 <br /> Laboratory Control Spike Soil QC Batch # 2005/04/28-03.62 <br /> LCS 2005/04/28-03.62-039 Extracted : 04/28/2005 Analyzed : 04/28/200518:39 <br /> LCSD <br /> Compound Conic. ug/Kg Exp.Conc. Recovery % RPD Ctrl.Limits % Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 63.3 50.0 126.6 69-129 20 <br /> Toluene 64.4 50.0 128.8 70-130 20 <br /> Surrogrates(s) <br /> 1 ,2-Dichloroethane-d4 546 500 109.2 72-124 <br /> Toluene-d8 516 500 103.2 75-116 <br /> Severn Trent Laboratories, Inc. 05/03/200512:45 <br /> STL San Francisco ` 1220 Quarry Lane, Pleasanton, CA 94566 <br /> pad msevem nem Pm Tel 925 484 1919 Fax 925 484 1096 ' w .stl-inc.com a CA DHS ELAP# 2496 Page 4 of 6 <br />