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' Submission 2005-05-0037 <br /> 1L L Fuel Oxygenates by 8260B <br /> LAqua Science Engineers, Inc <br /> Attn Dave Allen <br /> 208 West EI Pintado Road <br /> Danville, CA 94526 <br /> ' Phone (925) 820-9391 Fax (925) 837-4853 <br /> Project 3254 Received 05/02/2005 15 50 <br /> Singh <br /> ' Site Tracy, CA <br /> Batch QC Report <br /> Prep(s) 50308 Test(s) 82606 <br /> Matrix Spike ( MS 1 MSD } Water QC Batch#2005105112-01 64 <br /> MW-1 » MS Lab lD 2005-05-0037- 001 <br /> MS 2005105112-01 64-043 Extracted 05/12/2005 Analyzed 05/12/2005 11 43 <br /> Dilution 1 00 <br /> MSD 2005/05112-0164-005 Extracted 05/12/2005 Analyzed 05/12/2005 12 05 <br /> '. Dilution 1 00 <br /> Compound Conc u /L Spk Level Recovery% Limits% Fla s <br /> MS MSD Sample u /L MS MSD RPD Rec RPD MS MSD <br /> Methyl tert-butyl ether 349 375 434 25 0 1222 1500 204 65-165 20 R4 <br /> Benzene <br /> 276 284 ND 250 1104 1136 29 69-129 20 <br /> ' Toluene 31 6 314 ND 25 0 1264 1256 06 70-130 20 <br /> Surrogate(s) <br /> 1 2-Dichloroethane d4 519 555 500 1038 1110 73-130 <br /> Toluene d8 513 499 500 102.5 1998 81-114 <br /> 1 <br /> Severn Trent Laboratories, Inc 05/1812005 16 51 <br /> STL San Francisco*1220 Quarry Lane Pleasanton CA 94566 <br /> Apart of S.—.Trent Plc Tel 925 484 1919 Fax 925 484 1096*www stl-mc com*CA DHS ELAP#2496 Page 10 of 12 <br /> i <br />