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From:STL Chromal-ab To:Dai Watldns Date:12/21101 Time:6:09:50 PM Fax Page 42 of 43 <br /> Submission#: 2001-12-0252 <br /> -j Gas/BTEX by 801 5M/8021 <br /> Batch QC report <br /> STL Chromalab <br /> -:� Test Method: 8021 B Prep Method: 5030 1220 Quarry Lane <br /> Pleasanton,CA 94566 <br /> I <br /> Laboratory Control Spike(LCSILCSD) Water QC Batch#2001112120-91.5 Tel 925 484 1919 <br /> Analyzed: Fax 9254841096 <br /> r LCS: 2001112120-01.05-025 Extracted: 12/201200109:26 121201200109:28 www.sli-Inc.com <br /> LCSD: 2001112120-01.05-026 Extracted: 121201200110:01 Analyzed: 121201200110:01 www.chromalab.com <br /> CA DHS ELAP#1094 <br /> Compound Conc.[uglL] Exp.Conc.[uglL] Recovery[%I RPD Ctrl.Urnits[%] Flags <br /> LCS LCSD LCS LCSD <br /> LCS LCSD [°/a] Recovery RPD LCS LCSD <br /> Benzene 97.0 96.2 100.0 100.0 97.0 96.2 0.8 77-123 20 <br /> Toluene 89.1 68.0 100.0 100.0 89,1 88,0 1.2 70-122 20 <br /> i <br /> d Ethyl benzene 93.0 92.9 100.0 100.0 93.0 92,9 0.1 70-130 20 <br /> J <br /> Xylene(s) 275 273 300 300 91.7 91.0 0.8 75-125 20 <br /> Surrogafa(s) <br /> ;._� Trifluoro toluene 457 476 500 500 91.4 95.2 58.124 0 <br /> [:J <br /> is <br /> 'r <br /> 1 <br /> 1 � <br /> STL Chromalab Is a part of Sevam Trent Laboratories,Inc. Page 14 of 15 <br /> } .i <br />