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From:STL Chromalab To: Dai Watkins Date:12/21/01 Time:6:09:50 PM Fax Page 39 of 43 <br /> MI <br /> ,- Submission#: 2001-12-0252 <br /> •f; t <br /> F-1 Gas/BTEX by 8015M18021 <br /> Batch QC report <br /> STL Chromalab <br /> Test Method: 8021 B Prep Method: 5030 1220 Quarry Lane <br /> a Pleasanton,CA 94666 <br /> Laboratory Control Spike(LCSILCSD) Water QC Batch#2001/12120-01.01 Tel 925464 1919 <br /> Analyzed: Fax 926 484 1 096 <br /> LCS: 2001112120-01.01-004 Extracted: 121201200108:32 121201200108:32 www.sf-lnc.com <br /> LCSD: 2001112120-01.01-005 Extracted: 121201200109:01 Analyzed: 121201200109.01 www.chromalah.com <br /> CA DHS ELAPM094 <br /> Compound Cone.(ug/Ll Exp.Conc.[ug1L] Recovery[%] RPD Ctrl.Limits[°k] Flags <br /> =< LCS LCSD LCS LCSD LCS LCSD (%] Recovery RPD LCS LCSD <br /> _4 Benzene 106 104 100.0 100.0 106.0 104.0 1.9 77-123 20 <br /> Toluene 110 108 100.0 100.0 110.0 108,0 1.0 78-122 20 <br /> Ethyl benzene 106 102 100.0 100.0 108.0 102.0 3,8 70-130 20 <br /> Xylene(s) 320 316 300 300 106.7 105.0 1.6 75.125 20 <br /> Surrogafe(s) <br /> 1 . <br /> Tritlucrotoluene 635 626 600 600 107.0 106,0 66.124 <br /> s <br /> STL Chromalab Is a part of Severn Trent Laboratories,Inc. Page 11 of 15 <br />