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STLSubmission# 2004-01-0542 <br /> 16 <br /> Gas/BTEX Compounds (High Level) <br /> Treadwell & Rollo-San Francisco <br /> Attn Brian Moore <br /> 555 Montgomery Street, Suite 1300 <br /> San Francisco, CA 94111-2554 <br /> Phone (415) 955-9040 Fax (415) 955-9041 <br /> Project 2597 10 Received 01/20/2004 17 25 <br /> Stockton-Area 16 <br /> Batch QC Report <br /> Prep(s) 5030 Test(s) 8021 B <br /> Laboratory Control Spike Soil QC Batch#2004/01123-05 01 <br /> LCS 2004101123-05 01-002 Extracted 01/23/2004 Analyzed 01/23/2004 08 54 <br /> LCSD 2004101123-05 01-003 Extracted 01/23/2004 Analyzed 01/23/2004 09 20 <br /> Compound Conc mg/Kg Exp Conc Recovery % RPD Ctrl Limas% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Benzene 0 121 0130 0125 968 1040 7 2 77-123 35 <br /> Toluene 0 124 0 132 0125 992 1056 6 3 78-122 35 <br /> Ethyl benzene 0 117 0 124 0 125 936 99 2 5 6 70-130 35 <br /> Xylene(s) 0 349 0 374 0 375 931 99 7 6 8 75-125 35 <br /> Surrogates(s) <br /> Trifluorotoluene 442 457 500 1884 1914 53-125 0 <br /> Severn Trent Laboratories, Inc 01129/2004 12 36 <br /> STL San Francisco*1220 Quarry Lane Pleasanton CA 94566 <br /> A part of 5e rn Trent Pb Tel 925 484 1919 Fax 925 484 1096*www sti-mc com*CA DHS EIRP*2496 Page 5 of 7 <br /> r <br />