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r <br /> STL <br /> Submission # 2003-04-0709 <br /> Fuel Oxygenates by 8260B <br /> rClayton Group Services, Inc <br /> Attn Marc Mullaney <br /> 6920 Koll Center Parkway <br /> Suite 216 <br /> Pleasanton, CA 94566-4756 <br /> Phone (925) 426-2656 Fax (925) 426-0106 <br /> Project 80-02263 00 Received 04/29/2003 10 30 <br /> r <br /> Batch QC Report <br /> Prep(s) 5030B Test(5) 82606 <br /> Laboratory Control Spike Water QC Batch # 2003105106-1 b 62 <br /> LCS 2003105/06-1 b 62-046 Extracted 05/06/2003 Analyzed 05/06/2003 09 46 <br /> LCSD 2003105106-1 b 62-009 Extracted 05/06/2003 Analyzed 05/06/2003 10 09 <br />' Compound Conc ug/L Exp Conc Recovery RPD Ctrl Limits % Flags <br /> LCS LCSD LCS LCSD % Rec RPD LCS LCSD <br /> Benzene 281 26 4 25 1124 1056 6 2 69-129 20 <br /> Toluene 264 242 25 1056 968 87 70-130 20 <br /> Methyl tert-butyl ether(MTBE) 283 275 25 1132 110 0 29 65-165 20 <br /> Surrogates(s) <br />' 1 2-Dichloroethane-d4 469 473 500 938 946 76-114 <br /> Toluene-d8 1505 495 500 101 0 1990 1 1 88-110 <br /> r <br /> 1 <br /> i <br /> Severn Trent Laboratories, Inc 06/04/2003 12 31 <br /> STL San Francisco' 1220 Quarry Lane, Pleasanton CA 94566 <br /> Apart at Sevam Trent Plc Tei 925 484 1919 Fax 925 484 1096 a www stl-mc corn*CA DMS ELAP#2496 Page 6 of 6 <br /> r <br />