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Submission 2445-02-0138 <br /> STL t� <br /> Fuel Oxygenates by 82606 <br /> Aqua Science Engineers, Inc <br /> Attn Robert Kitay <br /> 208 West EI Pintado 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 Report <br /> Prep(s) 50306 Test(s) 82606 <br /> Matrix Spike (MS 1 MSD ) Water QC Batch #2005102111-011 68 <br /> MS/MSD Lab ID 2005-02-0146- 010 <br /> MS 2005102/11-0168-030 Extracted 02/11/2005 Analyzed 02/1112005 10 30 <br /> Dilution 1 00 <br /> MSD 2005/02/11-0168-047 Extracted 02/11/2005 Analyzed 02/11/2005 10 47 <br /> Dilution 1 Op <br /> Compound Conc u /L Spk Level Recovery% Limits% Flags <br /> MS MSD Sample ug/L MS MSD RPD Rec RPD MS MSD <br /> Methyl tert-butyl ether 327 358 ND 250 1308 1432 91 65-165 20 <br /> Benzene 309 31 1 ND 250 1236 1244 06 69-129 20 <br /> Toluene 317 325 ND 250 1268 1300 25 70-130 20 <br /> Surrogate(s) <br /> 1 2-Dichloroethane d4 488 510 500 975 1020 73-130 <br /> Toluene-d8 1539 1553 1 1 500 1 1079 11105 81-114 <br /> Severn Trent Laboratories, Inc 02/11/2005 16 04 <br /> STL San Francisco"1220 Quarry Lane Pleasanton CA 94566 <br /> N Part cr secern Trent Pic Tel 925 484 1919 Fax 925 484 1096"www stl-inc com"CA DNS ELAP#2496 Page 13 of 14 <br /> I - - <br />