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STLSubmission #: 2003-05-0695 <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: 05/23/2003 18:40 <br /> Batch QC Report <br /> Prep(s): 5035 Test(s): 8021 B <br /> Laboratory Control Spike Soil QC Batch #2003/05/28-01.01 <br /> LCS 2003/05/28-01.01-004 Extracted: 05/28/2003 Analyzed: 05/28/2003 08:25 <br /> LCSD 2003/05/28-01.01-005 Extracted: 05/28/2003 Analyzed: 05/28/2003 08:55 <br /> Compound Conc. mg/Kg Exp.Conc. Recovery RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 0.0930 0.0932 0.1000 93.0 93.2 0.2 77-123 35 <br /> Toluene 0.0925 0.0927 0.1000 92.5 92.7 0.2 78-122 35 <br /> Ethyl benzene 0.0927 0.0938 0.1000 92.7 93.8 1.2 70-130 35 <br /> Xylene(s) 0.281 0.286 0.300 93.7 95.3 1.7 75-125 35 <br /> Surrogates(s) <br /> Trifluorotoluene 505 506 500 101.0 101.2 53-125 <br /> Severn Trent Laboratories, Inc. 05/28/200317:30 <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 4 of 4 <br />