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Submission #: 2002-03-0524 <br /> Gas/BTEX by 8015M/8021 tim[IN <br /> Batch QC report <br /> STL San Francisco <br /> Test Method: 8021 B Prep Method: 5035 1220 Quarry Lane <br /> Pleasanton,CA 94566 <br /> . i Laboratory Control Spike (LCS/LCSD) Soil QC Batch#2002/04102-01.03 Tel 925 484 1919 <br /> Analyzed: Fax 925 484 1096 <br /> LCS: 2002104102-01.03-002 Extracted: 04/02/2002 09:27 04/02/2002 09:27 <br /> www.sti-inc.com <br /> LCSD: 2002/04102-01.03-003 Extracted: 04/02/2002 09:57 Analyzed: 04/02/2002 09:57 www.chromalab.com <br /> CA DHS ELAP#1094 <br /> Compound Conc.[mg/Kg] Exp.Conc.[mglKg] Recovery RPD CtrI.Limits j%j Flags <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recover RPD LCS LCSD <br /> Benzene 0.0962 0.0892 0.1000 0.1000 96.2 89.2 7.6 77-123 35 <br /> Toluene 0.0948 0.0881 0.1000 0.1000 94.6 88.1 7.3 78-122 35 <br /> -Ethyl benzene 0.0945 0.0892 0.1000 0.1000 94.5 89.2 5.8 70-130 35 <br /> �_- Xylene(s) 0.279 0.262 0,300 0.300 93.0 87.3 6.3 75-125 35 <br /> Surrogate(s) <br /> Trifluorotoluene 488 445 500 500 97.6 89.0 53-125 <br /> =4 <br /> STL San Francisco is a part of Severn Trent Laboratories,Inc. Page 17 of 21 <br /> � :i <br />