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STLSubmission #: 2003-05-0454 <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: 05/16/2003 13:00 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/05/19-01.05 <br /> LCS 2003/05/19-01.05-004 Extracted: 05/19/2003 Analyzed: 05/19/2003 08:38 <br /> LCSD 2003/05/19-01.05-005 Extracted: 05/19/2003 Analyzed: 05/19/2003 09:10 <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 89.4 92.4 100.0 89.4 92.4 3.3 77-123 20 <br /> Toluene 96.1 96.4 100.0 96.1 96.4 0.3 78-122 20 <br /> Ethyl benzene 93.9 96.2 100.0 93.9 96.2 2.4 70-130 20 <br /> Xylene(s) 280 283 300 93.3 94.3 1.1 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 484 516 500 96.8 103.2 58-124 <br /> Severn Trent Laboratories, Inc. 09/05/2003 09:54 <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 18 of 20 <br />