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STLSubmission# 2004-01-0474 <br /> Gas/BTEX Compounds (High Leel) <br /> Treadwell & Rollo-San Francisco ' <br /> Attn David Dixon <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 01/16/2004 16 50 <br /> Stockton -Carando Site <br /> Batch QC Report 1 <br /> Prep(s) 5030 Test(s) 8021 B <br /> Laboratory Control Spike Soil QC Batch#2004101121-05 01 ' <br /> LCS 2004101121-05 01-002 Extracted 01/21/2004 Analyzed 01/21/2004 22 35 ' <br /> LCSD 2004/01121-05 01-003 Extracted 01/21/2004 Analyzed 01/21/2004 23 01 <br /> Compound Conc mg/Kg 1 Exp Conic Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD ' <br /> Benzene 0 133 0138 0 125 1064 1104 37 77-123 35 <br /> Toluene 0 136 0140 0 125 1088 1120 29 78-122 35 <br /> Ethyl benzene 0 126 0 134 0 125 1008 1072 62 70-130 35 <br /> Xylene(s) 0 387 0 408 0 375 1032 1088 53 75-125 35 41 <br /> Surrogates(s) <br /> Tntluorotoluene 1978 1971 100 978 971 53-125 0 <br /> 1 <br /> Severn Trent Laboratories, Inc 011291200412 19 ' <br /> STL San Francisco* 1220 Quarry Lane,Pleasanton CA 94566 <br /> A part of Se—7rer*Rc Tel 925 484 1919 Fax 925 484 1096*www stl-Inc corn*CA DHS ELAP#2496 Page 7 of 9 <br />