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STLSubmission # 2006-02-0056 <br /> Gas/BTEX Fuel Oxygenates by 8260B <br /> Stratus Environmental Inc <br /> Attn Jay Johnson <br /> 3330 Cameron Park Drive, Suite 550 <br /> Cameron Park, CA 95682 <br /> Phone (530) 676-6007 Fax (530) 676-6005 <br /> Project U6100 Received 02/15/2006 09 20 <br /> 6100 <br /> Site 25775 S Patterson Pass, Tracy, CA 95376 <br /> Batch QC Report <br /> Prep(s) 5030B Test(s) 8260B <br /> Laboratory Control Spike Water QC Batch #2006102117-1A 62 <br /> LCS 2006102117-1A 62-058 Extracted 02/17/2006 Analyzed 0211 712006 09 58 <br /> LCSD 2006102117-1A 62-017 Extracted 02/17/2006 Analyzed 02/17/2006 11 17 <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) 233 226 25 932 904 31 65-165 20 <br /> Benzene 246 237 25 984 94 8 37 69-129 20 <br /> Toluene 254 239 25 101 6 956 61 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 435 439 500 870 878 73-930 <br /> Toluene-d8 473 470 500 946 940 81-114 <br /> Severn Trent Laboratories, Inc 02/20/2006 1642 <br /> STL San Francisco*1220 Quarry Lane, Pleasanton,CA 94566 <br /> A part of Severn Trent Plc Tel 925 484 1919 Fax 925 484 1096*www stl-inc corn*CA DHS FLAP#2496 Page 9 of 11 <br />