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STLSubmission #: 2003-06-0779 <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: 06/25/2003 15:31 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/06/26-01.04 <br /> LCS 2003/06/26-01.04-005 Extracted: 06/26/2003 Analyzed: 06/26/2003 08:48 <br /> LCSD 2003/06/26-01.04-006 Extracted: 06/26/2003 Analyzed: 06/26/2003 09:14 <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 99.6 95.3 100.0 99.6 95.3 4.4 77-123 20 <br /> Toluene 102 97.3 100.0 102.0 97.3 4.7 78-122 20 <br /> Ethyl benzene 99.9 95.4 100.0 99.9 95.4 4.6 70-130 20 <br /> Xylene(s) 284 273 300 94.7 91.0 4.0 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 523 489 500 104.6 97.8 58-124 <br /> Severn Trent Laboratories, Inc. 07/01/200310:16 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 <br /> A Part of Severn Trent Pc Tel 925 484 1919 Fax 925 484 1096'www.stl-inc.com`CA DHS ELAP#2496 Page 6 of 6 <br />