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STLSubmission #: 2003-06-0255 <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 Received: 06/09/2003 13:45 <br /> 7243.011 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/06/10-01.04 <br /> LCS 2003/06/10-01.04-005 Extracted: 06/10/2003 Analyzed: 06/10/2003 08:49 <br /> LCSD 2003/06/10-01.04-006 Extracted: 06/10/2003 Analyzed: 06/10/2003 09:13 <br /> Compound Conc. ug/L Exp.Conc. Recovery RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 96.1 93.8 100.0 96.1 93.8 2.4 77-123 20 <br /> Toluene 97.7 95.3 100.0 97.7 95.3 2.5 78-122 20 <br /> Ethyl benzene 97.7 94.5 100.0 97.7 94.5 3.3 70-130 20 <br /> Xylene(s) 275 267 300 91.7 89.0 3.0 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 540 516 500 108.0 103.2 58-124 <br /> Severn Trent Laboratories, Inc. 06/10/200316:37 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 <br /> A part of Severn Trent Plc Tel 925 484 1919 Fax 925 484 1096'www.stl-inc.com`CA DHS ELAP#2496 Page 6 of 6 <br />