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Submission 2005-02-0138 <br /> STL• Fuel Oxygenates by 8260B <br /> Aqua Science Engineers, Inc <br /> Attn Robert Kitay <br /> 208 West EI Plntado Road <br /> Danville, CA 94526 <br /> Phone (925) 820-9391 Fax (925) 837-4853 <br /> Project 3254 Received 02/04/2005 17 20 <br /> Singh <br /> Site 574 West Grant Line Rd , Tracy, CA <br /> Batch QC Re ort <br /> Prep(s) 50306 Test(s) 8260E <br /> Laboratory Control Spike Water QC Batch#2005102111-01 68 <br /> LCS 2005/02111-0168-005 Extracted 02111/2005 Analyzed 02/11/2005 07 05 <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) 224 25 0 89 6 65-165 20 <br /> Benzene 239 25 0 95 6 69-129 20 <br /> Toluene 246 25 0 984 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 448 500 89 6 73-130 <br /> Toluene-d8 569 500 11138 1 81-114 <br /> • Severn Trent Laboratories, Inc 02111120051604 <br /> STL San F=rancisco*1220 Quarry Lane Pleasanton CA 94566 <br /> A part of severe Trent Me Tel 925 484 1919 Fax 925 484 1 096*www stl-inc corn*CA DHS ELAP#2496 Page 11 of 14 <br />