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STLSubmission #: 2003-04-0681 <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 Received: 04/28/2003 18:30 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Matrix Spike ( MS/MSD ) Water QC Batch #2003/04/29-01.04 <br /> S44-42803 >> MS Lab ID: 2003-04-0681 - 004 <br /> MS: 2003/04/29-01.04-015 Extracted: 04/29/2003 Analyzed: 04/29/200313:31 <br /> Dilution: 1.00 <br /> MSD: 2003/04/29-01.04-016 Extracted: 04/29/2003 Analyzed: 04/29/200313:56 <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 98.9 101 ND 100.0 98.9 101.0 2.1 65-135 20 <br /> Toluene 98.9 101 ND 100.0 98.9 101.0 2.1 65-135 20 <br /> Ethyl benzene 97.8 100 ND 100.0 97.8 100.0 2.2 65-135 20 <br /> Xylene(s) 279 282 ND 300 93.0 94.0 1.1 65-135 20 <br /> Surrogate(s) <br /> Trifluorotoluene 1561 1583 1 1 500 1112.2 1116.6 1 158-124 <br /> Severn Trent Laboratories, Inc. 04/30/200310:18 <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 9 of 9 <br />