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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 #2003/05/21-01.05 <br /> LCS 2003/05/21-01.05-004 Extracted: 05/21/2003 Analyzed: 05/21/2003 08:27 <br /> LCSD 2003/05/21-01.05-005 Extracted: 05/21/2003 Analyzed: 05/21/2003 08:59 <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 88.9 92.0 100.0 88.9 92.0 3.4 77-123 20 <br /> Toluene 95.2 97.7 100.0 95.2 97.7 2.6 78-122 20 <br /> Ethyl benzene 97.5 96.4 100.0 97.5 96.4 1.1 70-130 20 <br /> Xylene(s) 287 283 300 95.7 94.3 1.5 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 490 497 500 98.0 99.4 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 19 of 20 <br />