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STLSubmission #: 2003-05-0784 <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 C Received: 05/29/2003 18:05 <br /> 7243.011 C <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/06/06-01.04 <br /> LCS 2003/06/06-01.04-005 Extracted: 06/06/2003 Analyzed: 06/06/2003 09:06 <br /> LCSD 2003/06/06-01.04-006 Extracted: 06/06/2003 Analyzed: 06/06/2003 09:30 <br /> Compound Conc. ug/L Exp.Conc. Recovery RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 107 102 100.0 107.0 102.0 4.8 77-123 20 <br /> Toluene 108 104 100.0 108.0 104.0 3.8 78-122 20 <br /> Ethyl benzene 106 102 100.0 106.0 102.0 3.8 70-130 20 <br /> Xylene(s) 301 289 300 100.3 96.3 4.1 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 592 556 500 118.4 111.2 58-124 <br /> Severn Trent Laboratories, Inc. 06/10/200311:46 <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 10 of 11 <br />