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STLSubmission #: 2003-06-0601 <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 /> Laboratory Control Spike Water QC Batch #2003/06/19-01.04 <br /> LCS 2003/06/19-01.04-005 Extracted: 06/19/2003 Analyzed: 06/19/2003 08:54 <br /> LCSD 2003/06/19-01.04-006 Extracted: 06/19/2003 Analyzed: 06/19/2003 09:19 <br /> Compound Conc. ug/L Exp.Conc. Recovery% RPD Ctrl.Limits% Flags <br /> LCS LCSD LCS LCSD % Rec. RPD LCS LCSD <br /> Benzene 92.5 96.9 100.0 92.5 96.9 4.6 77-123 20 <br /> Toluene 93.2 98.0 100.0 93.2 98.0 5.0 78-122 20 <br /> Ethyl benzene 91.7 96.1 100.0 91.7 96.1 4.7 70-130 20 <br /> Xylene(s) 260 274 300 86.7 91.3 5.2 75-125 20 <br /> Surrogates(s) <br /> Trifluorotoluene 456 500 500 91.2 100.0 58-124 <br /> Severn Trent Laboratories, Inc. 06/23/2003 08:30 <br /> STL San Francisco'1220 Quarry Lane,Pleasanton,CA 94566 <br /> A Part of Severn Trent Pc Tel 925 484 1919 Fax 925 484 1096'www.stl-inc.com`CA DHS ELAP#2496 Page 6 of 6 <br />