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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 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 /> 455 865 FAX(707)792-0342 <br /> Analytical 1551 In rial welIRoad North,Ste. D SanalCarlos,CA 94070-4111 (650)232-Petuma.CA 94954 (707) 9600 FAX(650)232-%l2 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2124199 to 2125/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2126199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3!5/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/QuaIity Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> B.it1_rb: 9030021 xtracti[!i Meth2rl: EPA 503.08 [MeOHI <br /> Blank 9030021-BLK1 <br /> Tert-butyl alcohol 313199 ND mg/kg 10.0 <br /> Methyl tert-butyl ether ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> Surrogate: 1,2-DCA-d4 2.50 2.54 60.0-140 102 <br /> I.CS 9030021-OSI <br /> Methyl tert-butyl ether 313199 2.50 2.40 mg/kg 70.0-130 96.0 <br /> Surrogate: 1,2-DCA-d4 1, 2.50 2.54 60.0-140 102 <br /> 9030021-MSl 5902285-18 <br /> Yl tert-butyl ether 3/3/99 2.50 ND 2.40 mg/kg 60.0-140 96.0 <br /> urrogale: 1,2-DCA-d4 02.50 2.44 60.0-140 97.6 <br /> Matrix Spike un 9030021-MSD1 5902285-18 <br /> Methyl tert-butyl ether 3/3/99 2.50 ND 2.37 mg/kg 60.0-140 94.8 25.0 1.26 <br /> Surrogate., 1,2-DCA-d4 2.50 2.37 60.0-140 94.8 <br /> q5 uoia Analytical -Sacramento *Refer to end of report for Text of notes and definitions. <br /> c � (C-1 7� <br /> Sandra R. Hanson,Client Services Representative Page 20 of 21 <br />