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Submission 2005-05-0037 II <br /> • STL Fuel Oxygenates by 82606 <br /> ' Aqua Science Engineers, Inc <br /> Attn Dave Allen <br /> 208 West EI Plntado 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) 50306 Test(s) 8260E <br /> ' Laboratory Control Spike Water QC Batch#2005105112-01 64 <br /> LCS 2005/05/12-0164-059 Extracted 05/12/2005 Analyzed 05/12/2005 06 59 <br /> LCSD 2005105112-01 64-022 Extracted 05/12/2005 Analyzed 05/12/2005 07 22 <br /> Compound Conc ug/L Exp Conc Recovery% RPDJ Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Methyl tert-butyl ether(MTBE) 265 267 250 1060 1068 0 8 65-165 20 <br /> Benzene 257 24 5 25 0 1028 980 4 8 69-129 20 <br /> Toluene 287 27 5 250 1148 1100 43 70-130 20 <br /> Surrogates(s) <br /> 1,2-Drchloroethane-d4 493 506 500 986 101 2 73-130 <br /> Toluene-d8 515 498 500 1 1030 996 1 181-114 <br /> Severn Trent Laboratories, Inc 05/18/2005 16 51 <br /> STL San Francisco`1220 Quarry Lane, Pleasanton CA 94566 <br /> Apart of Be—Tient Plc Tel 925 484 1919 Fax 925 484 1 095"www stl me com'CA DHS FLAP*2496 Page 8 of 12 <br />