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STLSubmission M 2003-04-0034 <br /> Gas/BTEX Compounds by 8015M/8021 <br /> Geomatrix Consultants <br /> Attn.: Julie Eyre <br /> 2101 Webster Street, 12th Floor <br /> Oakland, CA 94612 <br /> Phone: (510) 663-4192 Fax: (510) 663-4141 <br /> Project: 7243.011 Received: 04/01/2003 18:30 <br /> Batch QC Report <br /> Prep(s): 5030 Test(s): 8021 B <br /> Laboratory Control Spike Water QC Batch #2003/04/02-01.02 <br /> LCS 2003/04/02-01.02-004 Extracted: 04/02/2003 Analyzed: 04/02/2003 09:18 <br /> LCSD 2003/04/02-01.02-005 Extracted: 04/02/2003 Analyzed: 04/02/2003 09:48 <br /> Compound Conc. ug/L Exp.Conc. Recovery RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 91.9 91.6 100.0 91.9 91.6 0.3 77-123 20 <br /> Toluene 91.8 91.4 100.0 91.8 91.4 0.4 78-122 20 <br /> Ethyl benzene 90.9 93.8 100.0 90.9 93.8 3.1 70-130 20 <br /> Xylene(s) 269 274 300 89.7 91.3 1.8 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 421 416 500 84.2 83.2 58-124 <br /> Severn Trent Laboratories, Inc. 04/02/200316:17 <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 5 of 5 <br />