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STLSubmission #: 2003-06-0352 <br /> Gas/BTEX Compounds by 8015M/8021 <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 TC Received: 06/11/2003 15:50 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/06/12-01.04 <br /> LCS 2003/06/12-01.04-005 Extracted: 06/12/2003 Analyzed: 06/12/2003 08:30 <br /> LCSD 2003/06/12-01.04-006 Extracted: 06/12/2003 Analyzed: 06/12/2003 08:55 <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 97.8 91.4 100.0 97.8 91.4 6.8 77-123 20 <br /> Toluene 99.5 93.0 100.0 99.5 93.0 6.8 78-122 20 <br /> Ethyl benzene 98.7 92.6 100.0 98.7 92.6 6.4 70-130 20 <br /> Xylene(s) 277 261 300 92.3 87.0 5.9 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 535 494 500 107.0 98.8 58-124 <br /> Severn Trent Laboratories, Inc. 06/13/200310:34 <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 8 of 8 <br />