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STLSubmission #: 2003-06-0142 <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 C Received: 06/05/2003 12:15 <br /> 7243.011 C <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Matrix Spike ( MS/MSD ) Water QC Batch #2003/06/06-01.04 <br /> S2-2-060403 >> MS Lab ID: 2003-06-0142 - 002 <br /> MS: 2003/06/06-01.04-030 Extracted: 06/06/2003 Analyzed: 06/06/2003 20:01 <br /> Dilution: 1.00 <br /> MSD: 2003/06/06-01.04-031 Extracted: 06/06/2003 Analyzed: 06/06/2003 20:25 <br /> Dilution: 1.00 <br /> Compound Conc. ug/L Spk.Level Recovery Limits% Flags <br /> MS MSD Sample ug/L MS MSD RPD Rec. RPD MS MSD <br /> Benzene 112 119 ND 100.0 112.0 119.0 6.1 65-135 20 <br /> Toluene 113 121 ND 100.0 113.0 121.0 6.8 65-135 20 <br /> Ethyl benzene 111 120 ND 100.0 111.0 120.0 7.8 65-135 20 <br /> Xylene(s) 313 323 ND 300 104.3 107.7 3.2 65-135 20 <br /> Surrogate(s) <br /> 4-Bromofluorobenzene 1539 1541 1 1 500 1 107.8 1 108.2 1 150-150 <br /> Severn Trent Laboratories, Inc. 06/09/200315:21 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 <br /> A part of Severn Trent Pic Tel 925 484 1919 Fax 925 484 1096'www.stl-inc.com`CA DHS ELAP#2496 Page 11 of 11 <br />