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Submission #: 2002-03-0551 Erawl E761 <br /> Gas/BTEX by 8015M18021 <br /> Batch QC report <br /> STL San Francesco <br /> =' Test Method: 8021 B Prep Method: 5035 1220 Quarry Lane <br /> ,_";I Pleasanton,CA 94566 <br /> Laboratory Control Spike (LCSILCSD) Soil QC Batch#2002104104-01.01 Tel 925 484 1919 <br /> LCS: 2002104104-01.01-007 Extracted: 04/04/2002 10:50 Analyzed: 04/04/2042 10:50 Fax 925 484 1096 <br /> www.stl-inc.c om <br /> LCSD: 2002104104-01.01-008 Extracted: 041041200211:20 Analyzed: 041041200211:20 www,chrDmalab.com <br /> CA DHS ELAP#1094 <br /> Compound Conc.[mg/Kg] Exp.Conc.[mg/Kg] Recovery RPD Ctrl.Limits[%] Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recover RPD LCS LCSD <br /> j Benzene 0.0971 0.0999 0.1000 0.1000 97.1 99,9 2.8 77-123 35 <br /> `= Toluene 0.0994 0.102 0.1D00 0.1000 99.4 102.0 2.6 78-122 35 <br /> Ethyl benzene 0.0988 0.100 0.1000 0.1000 98.8 100.0 1.2 70-130 35 <br /> Xylene(s) 0.298 0.306 0.300 0.300 993 102.0 2.7 75-125 35 <br /> Surrogate(s) <br /> Trifluorotoluene 579 591 500 500 115.8 118.2 53-125 <br /> D <br /> =;1 <br /> Al <br /> M'.±r <br /> 'r <br /> N <br /> II <br /> i <br /> STL San Francisco is a part of Severn Trent Laboratories,Inc. Page 24 of 26 <br />