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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9Z1-0100 <br /> Anal�T�y��� 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707)792-0342 <br /> Y1 1551 Industrial Read San Carlos CA 94070-4111 (650)2.32 9600 FAX(650)232-9612 <br /> recor Client Project ID Arco# 4932, Stockton Sampled May 26, 1999 <br /> 9912 Business Park Dr Ste 100 Sample Descrlpt Sod, T2S@15' Received May 27, 1999 <br /> Sacramento, CA 95827 Analysis Method EPA 8260 Analyzed Jun 9, 1999 <br /> Attention Rusty Benkosky Lab Number 906-0254 Reported Jun 28, 1999 <br /> QC Batch Number SP0604998260EXA <br /> Instrument IQ GC/MS-2 <br /> OXYGENATED COMPOUNDS (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> mg/Kg mg/Kg <br /> t-Butanol 10 N D <br /> Methyl t-Butyl Ether (MTBE) 020 97 <br /> DI-Isopropyl Ether (DIPE) 020 N D <br /> Ethyl t-Butyl Ether(ETBE) 020 N D <br /> t-Amyl Methyl Ether(TAME) 020 N D <br /> 1,2-Dichloroethane 020 N D <br /> Surrogates Control Limit% % Recovery <br /> Dibromofluoromethane 50 150 98 <br /> eptchloroethane-d4 50 150 102 <br /> Analytes reported as N D were not present above the stated limit of detection Because matrix effects and/or other factors <br /> required additional sample dilution,detection limits for this sample have been raised <br /> SEQUOIA ANALYTICAL, #1271 <br /> f�auvt'4- <br /> Dimple <br /> Sharma <br /> Project Manager <br /> p� 9060251 SSS <5> <br />