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STLSubmission #: 2003-07-0325 <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: 07/10/2003 19:30 <br /> 7243.011 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/07/11-01.04 <br /> LCS 2003/07/11-01.04-005 Extracted: 07/11/2003 Analyzed: 07/11/2003 09:11 <br /> LCSD 2003/07/11-01.04-006 Extracted: 07/11/2003 Analyzed: 07/11/2003 09:37 <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 104 97.5 100.0 104.0 97.5 6.5 77-123 20 <br /> Toluene 105 98.9 100.0 105.0 98.9 6.0 78-122 20 <br /> Ethyl benzene 105 97.4 100.0 105.0 97.4 7.5 70-130 20 <br /> Xylene(s) 293 275 300 97.7 91.7 6.3 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 532 494 500 106.4 98.8 58-124 <br /> Severn Trent Laboratories, Inc. 07/14/200312:33 <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 5 of 5 <br />