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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)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Analytical <br /> 1551 Industrial Road San Carlos CA 94070-4 1 1 1 (650)232 9600 FAX(650)232-966 <br /> Secor Client project ib Arco # 4932, Stockton Sampled May 26, 1999 <br /> 9912 Business Park Dr Ste 100 Sample Descript Soil, TIN(g15' Recetved May 27, 1999 <br /> Sacramento, CA 95827 Analysis Method EPA 8260 Analyzed Jun 9, 1999 <br /> Attention Rusty Benkosky Lab Number 906-0251 Reported Jun 28, 1999 <br /> QC Batch Number SP0604998260FXA <br /> Instrument ID GC/MS-2 <br /> OXYGENATED COMPOUNDS (EPA 8260) <br /> Analyte Detection Limit Sample Results <br /> mg/Kg mg/K9 <br /> t-Butanol 10 N D <br /> Methyl t-Butyl Ether(MTBE) 020 13 <br /> Di-Isopropyl Ether (DIPE) 020 U 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 /> Dlbromofluoromethane 50 150 90 <br /> 1,2-Dichloroethane-d4 50 150 88 <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 /> Dimple Sharma <br /> Project Manager <br /> 9060251 SSS <2> <br />