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STLSubmission #: 2003-05-0647 <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: 05/22/2003 18:40 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/05/23-01.04 <br /> LCS 2003/05/23-01.04-005 Extracted: 05/23/2003 Analyzed: 05/23/2003 09:13 <br /> LCSD 2003/05/23-01.04-006 Extracted: 05/23/2003 Analyzed: 05/23/2003 09:38 <br /> Compound Conc. ug/L Exp.Conc. Recovery RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 98.6 97.0 100.0 98.6 97.0 1.6 77-123 20 <br /> Toluene 99.1 97.5 100.0 99.1 97.5 1.6 78-122 20 <br /> Ethyl benzene 98.5 97.0 100.0 98.5 97.0 1.5 70-130 20 <br /> Xylene(s) 279 274 300 93.0 91.3 1.8 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 553 529 500 110.6 105.8 58-124 <br /> Severn Trent Laboratories, Inc. 05/28/200310:26 <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 9 of 9 <br />