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STLSubmission #: 2003-06-0483 <br /> 8021 B-BTEX <br /> Geomatrix Consultants <br /> Attn.: Martin Bloes <br /> 2101 Webster St.,12 th Floor <br /> Oakland, CA 94612 <br /> Phone: (510) 663-4148 Fax: (510) 663-4141 <br /> Project: 7243.011 Received: 06/16/2003 12:50 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/06/16-01.04 <br /> LCS 2003/06/16-01.04-007 Extracted: 06/16/2003 Analyzed: 06/16/200310:08 <br /> LCSD 2003/06/16-01.04-008 Extracted: 06/16/2003 Analyzed: 06/16/200310:33 <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 93.8 92.9 100.0 93.8 92.9 1.0 77-123 20 <br /> Toluene 95.2 94.4 100.0 95.2 94.4 0.8 78-122 20 <br /> Ethyl benzene 95.0 93.6 100.0 95.0 93.6 1.5 70-130 20 <br /> Xylene(s) 267 264 300 89.0 88.0 1.1 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 506 498 500 101.2 99.6 58-124 <br /> Severn Trent Laboratories, Inc. 06/17/200316:38 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 <br /> A part of Severn Trent Pic Tel 925 484 1919 Fax 925 484 1096'www.stl-inc.com`CA DHS ELAP#2496 Page 6 of 7 <br />