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STLSubmission #: 2003-05-0695 <br /> Volatile Organic Compounds by 82608 <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: 05/23/2003 18:40 <br /> Batch QC Report <br /> Prep(s): 5030B Test(s): 8260B <br /> Laboratory Control Spike Water QC Batch #2003/05/28-01.07 <br /> LCS 2003/05/28-01.07-006 Extracted: 05/28/2003 Analyzed: 05/28/200312:56 <br /> LCSD 2003/05/28-01.07-004 Extracted: 05/28/2003 Analyzed: 05/28/200312:06 <br /> Compound Conc. ug/L Exp.Conc. Recovery RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 18.0 16.8 20.0 90.0 84.0 6.9 69-129 20 <br /> Toluene 17.5 16.7 20.0 87.5 83.5 4.7 70-130 20 <br /> Surrogates(s) <br /> 4-Bromofluorobenzene 468 469 500 93.6 93.8 86-115 <br /> 1,2-Dichloroethane-d4 502 483 500 100.4 96.6 76-114 <br /> Toluene-d8 483 491 500 96.6 98.2 88-110 <br /> Severn Trent Laboratories, Inc. 05/28/200317:26 <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 17 of 17 <br />