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STLSubmission #: 2003-04-0681 <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: 04/28/2003 18:30 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/04/29-01.04 <br /> LCS 2003/04/29-01.04-004 Extracted: 04/29/2003 Analyzed: 04/29/2003 08:29 <br /> LCSD 2003/04/29-01.04-005 Extracted: 04/29/2003 Analyzed: 04/29/2003 08:53 <br /> Compound Conc. ug/L Exp.Conc. Recovery RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 99.3 96.2 100.0 99.3 96.2 3.2 77-123 20 <br /> Toluene 99.3 96.2 100.0 99.3 96.2 3.2 78-122 20 <br /> Ethyl benzene 99.1 94.7 100.0 99.1 94.7 4.5 70-130 20 <br /> Xylene(s) 282 272 300 94.0 90.7 3.6 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 529 510 500 105.8 102.0 58-124 <br /> Severn Trent Laboratories, Inc. 04/30/200310:18 <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 8 of 9 <br />