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STLSubmission #: 2003-06-0011 <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: 06/02/2003 08:40 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Matrix Spike ( MS/MSD ) Water QC Batch #2003/06/02-01.04 <br /> S1-0-060103 >> MS Lab ID: 2003-06-0011 - 001 <br /> MS: 2003/06/02-01.04-029 Extracted: 06/02/2003 Analyzed: 06/02/200318:49 <br /> Dilution: 1.00 <br /> MSD: 2003/06/02-01.04-030 Extracted: 06/02/2003 Analyzed: 06/02/200319:13 <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 105 105 ND 100.0 105.0 105.0 0.0 65-135 20 <br /> Toluene 106 105 ND 100.0 106.0 105.0 0.9 65-135 20 <br /> Ethyl benzene 105 104 ND 100.0 105.0 104.0 1.0 65-135 20 <br /> Xylene(s) 293 291 ND 300 97.7 97.0 0.7 65-135 20 <br /> Surrogate(s) <br /> Trifluorotoluene 1582 1 580 1 1 500 1 116.4 1 116.0 1 1 58-124 <br /> Severn Trent Laboratories, Inc. 06/04/200313:07 <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 10 of 10 <br />