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STLSubmission #: 2003-06-0042 <br /> 8021 B-BTEX <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: 06/02/2003 18:25 <br /> 7243.011 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/06/03-01.04 <br /> LCS 2003/06/03-01.04-005 Extracted: 06/03/2003 Analyzed: 06/03/2003 09:36 <br /> LCSD 2003/06/03-01.04-006 Extracted: 06/03/2003 Analyzed: 06/03/200310:01 <br /> Compound Conc. ug/L Exp.Conc. Recovery RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 99.3 95.6 100.0 99.3 95.6 3.8 77-123 20 <br /> Toluene 100 97.5 100.0 100.0 97.5 2.5 78-122 20 <br /> Ethyl benzene 98.9 95.2 100.0 98.9 95.2 3.8 70-130 20 <br /> Xylene(s) 279 272 300 93.0 90.7 2.5 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 546 524 500 109.2 104.8 58-124 <br /> Severn Trent Laboratories, Inc. 06/04/200313:05 <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 10 <br />