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STLSubmission 2005-05-0037 <br /> • Fuel Oxygenates by 82608 <br /> Aqua Science Engineers, Inc <br /> ' Attn Dave Allen <br /> 208 West El 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) 5030B Test(s) 8260E <br /> Matrix Spike ( MS/MSD ) Water QC Batch#2005105113-01 64 <br /> MS/MSD Lab ID 2005-05-0262-002 <br /> ' MS 2005/05/13-0164-045 Extracted 05/13/2005 Analyzed 05/13/2005 15 45 <br /> Dilution 1 00 <br /> MSD 2005/05/13-0164-008 Extracted 05/1312005 Analyzed 05/13/2005 16 08 <br /> Dilution 100 <br /> Compound Conc ug/L S k Leve Recovery% Limits% Flags <br /> ' MS MSD Sample ug/L MS MSD RPD Rec RPD M5 MSD <br /> Methyl tert-butyl ether 288 286 ND 250 1152 1144 07 65-165 20 <br /> Benzene 270 263 NO 25 0 1080 1052 26 69-129 20 <br /> Toluene 31 2 301 NO 25 0 1248 1204 36 70-130 20 <br /> ' <br /> Surrogate(s) <br /> 1 2-Dichloroethane-d4 551 551 500 1101 1102 73-130 <br /> Toluene-d8 519 1505 1 500 1037 1010 81-114 <br /> Severn Trent Laboratories, Inc 05/18/2005 16 51 <br /> ' STL San Francisco"1220 Quarry Lane,Pleasanton,CA 94566 <br /> A part of seem Trent Pic Tel 925 484 1919 Fax 925 484 1096"www stl-inc corn'CA DHS ELAP#2496 Page 1 i of 12 <br />