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Submission# 2005-04-0633 <br /> Fuel Oxygenates by 82608 <br /> Treadwell & Rollo-San Francisco STL San Fran cisc <br /> Attn David Dixon 1220 Quarry Lane <br /> 555 Montgomery Street Suite 1300 Pleasanton,CA 94566 <br /> San Francisco, CA 94111-2554 Tel (925)484-1919 <br /> Phone (415)955-9040 Fax (415)955-9041 Fax (925)484-1096 , <br /> Protect 2597 10 Received 04/20/2005 14 00 www st!-mc corn <br /> www chromalab com <br /> Carando <br /> CA DWS ELARI 2496 <br /> Batch QC Report <br /> Prep(s) 50308 Test(s) 8260E ' <br /> Laboratory Control Spike Water QC Batch#2005104130-01 64 <br /> LCS 2005104/30-01 64-039 Extracted 04/30/2005 Analyzed 04/30/2005 09 39 <br /> LCSD <br /> Compound Conc ug/L Exp Conc Recovery % RPD Ctrl Limits% Flags ' <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Methyl tert-butyl ether(MTBE) 241 250 964 65-165 20 <br /> Benzene 305 25 0 1220 69-129 20 <br /> Toluene 306 25 0 1224 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dtchloroethane-d4 416 500 832 73-130 <br /> Toluene-618 489 500 1978 1 1 181-1141 <br /> 05/13/2005 09 05 STL San Francisco is Dart of Severn Trent Laboratories Inc Page 4 of 6 ' <br />