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STLSubmission #: 2003-06-0600 <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: 06/19/2003 11:25 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Matrix Spike ( MS/MSD ) Water QC Batch #2003/06/19-01.04 <br /> S2-1-061803 >> MS Lab ID: 2003-06-0600 - 001 <br /> MS: 2003/06/19-01.04-027 Extracted: 06/19/2003 Analyzed: 06/19/200319:28 <br /> Dilution: 1.00 <br /> MSD: 2003/06/19-01.04-028 Extracted: 06/19/2003 Analyzed: 06/19/200319:53 <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 106 109 ND 100.0 106.0 109.0 2.8 65-135 20 <br /> Toluene 107 110 ND 100.0 107.0 110.0 2.8 65-135 20 <br /> Ethyl benzene 107 110 ND 100.0 107.0 110.0 2.8 65-135 20 <br /> Xylene(s) 298 308 ND 300 99.3 102.7 3.4 65-135 20 <br /> Surrogate(s) <br /> Trifluorotoluene 1586 1 590 1 1 500 1 117.3 1 118.0 1 1 58-124 <br /> Severn Trent Laboratories, Inc. 06/20/200314:10 <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 7 of 7 <br />