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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)92 1-0 100 <br /> rco <br /> 455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792-0342 <br /> Analytical 11551 Industrial Road San Carlos CA 94070-411 1 (650)232-9600 FAX(650)232-9612 <br /> Client Project I0 Arco #4932 Stockton Sampled May 26 <br /> p y 1999 <br /> 9912 Business Park Dr, Suite #100 Sample Descript Sod, D3@4' Received May 27, 1999 <br /> Sacramento, CA95827 Analysis Method EPA 8260 Analyzed Jun 3, 1999 <br /> Attention Rusty Benkosky lab Number 905-2305 Reported Jun 7, 1999 <br /> QC Batch Number 9050123 <br /> Instrument ID <br /> OXYGENATED COMPOUNDS (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> pg/Kg pg/K9 <br /> 1,2-Dichforoethane 100 N D <br /> Ethanol 50,000 N D <br /> t-Butanol 10,000 N D <br /> Methyl t-Butyl Ether (MTBE) 100 N b <br /> Di-Isopropyl Ether (DfPE) 100 N D <br /> Ethyl t-Butyl Ether (ETRE) 100 N D <br /> t-Amyl Methyl Ether (TAME) 100 N D <br /> Surrogates Control Limit % % Recovery <br /> 1,2-Dichloroethane-d4 70 121 85 <br /> I <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL, San Carlos <br /> *kt'tw" <br /> Dimple Sharma <br /> Project Manager <br /> 9052303 SSS <8> <br />