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q I <br /> STL Submission# 2003-10-0311 <br /> Fuel Oxygenates by 8260B <br /> SECOR-Sacramento <br /> Attn Clint Harms <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95670 <br /> Phone (916)861-0400 Fax (916)861-0430 <br /> Protect Circle K 1205 Received 10/09/2003 10 50 <br /> Site 16470 Cambridge Street, Lathrop, CA <br /> Batch QC Report <br /> Prep(s) 50308 Test(s) 8260B <br /> Laboratory Control Spike Water QC Batch#2003/10/13-01 65 <br /> LCS 2003/10/13-01 65-052 Extracted 10/13/2003 Analyzed 10113/200309 52 <br /> LCSD 2003/10/13-0165-014 Extracted 10/13/2003 Analyzed 10113/2003 10 14 <br /> Compound Conc ug/L Exp Conc Recovery% RPD Ctrl Limits% Flags <br /> LCS LCSD LCS LCSD % RBC 1 RPD LCS LCSD <br /> Methyl tert-butyl ether(MTBE) 204 220 250 816 880 75 65-165 20 <br /> Benzene 25 3 233 250 1012 932 8 2 69-129 20 <br /> Toluene 276 231 250 1100 92 4 174 70-130 20 <br /> Surrogates(s) <br /> 1,2-Dichloroethane-d4 406 419 500 812 838 76-114 <br /> Toluene-d8 ' 531 453 500 11062 1906 1 1 88-110 <br /> 1 1 <br /> Severn Trent Laboratories, Inc 10/14/2003 13 37 <br /> STL San Francisco.1220 Quarry Lane Pleasanton CA 94566 <br /> A Pd d S.—T-mM Tel 925 484 1919 Fax 925 484 1096'www stl inc corn'CA OHS ELAP#2496 Page 4 of 4 <br />