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680 Chesapeake <br /> Sequoia 404 N. get Lanpedv- Wan t Creek.A 94 3 {925)988-9600 FAX(925)9$8-9673 <br /> (650)364-9600 FAX(650)364-9233 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0 100 <br /> 865 FAX(707)792-032 <br /> - 7N Analytical 1551 Industrial455 cDowetiRoad Blvd.North,Ste. SanalCarlos,,CCA 94070-41 11 (650)232-94954 (707) 79Z-19600 FAX(650)232-9642 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2124199 to 2/25/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: NIA Received: 2126199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosk Reported: 315!99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Notes* <br /> PG4(continued) 5903005 X411 <br /> Methyl tent-butyl ether 9030021 3/1/99 313199 0.100 ND mg/kg <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tent-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> Surrogate: 1,2-DCA-d4 60.0-140 106 % <br /> Sequoia Analytical- Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 14 of 21 <br />