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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 #2003/06/09-01.04 <br /> LCS 2003/06/09-01.04-005 Extracted: 06/09/2003 Analyzed: 06/09/2003 08:35 <br /> LCSD 2003/06/09-01.04-006 Extracted: 06/09/2003 Analyzed: 06/09/2003 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 93.0 89.8 100.0 93.0 89.8 3.5 77-123 20 <br /> Toluene 94.2 91.5 100.0 94.2 91.5 2.9 78-122 20 <br /> Ethyl benzene 94.2 89.8 100.0 94.2 89.8 4.8 70-130 20 <br /> Xylene(s) 264 257 300 88.0 85.7 2.6 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 522 496 500 104.4 99.2 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 11 of 11 <br />