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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-%W FAX(916)921-0 100 <br /> Analytical 1455 McDowell Blvd.North,Ste. D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650)232-9600 FAX(650) 232-9612 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2/10/99 to 2/12/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2/16/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/2/99 <br /> Volatile Organic 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 /> _MW-4 010 59022_31-18 W <br /> Tert-butyl alcohol 9020258 2/22/99 2/22/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 ND " <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> Surrogate: 1,2-DCA-d4 60.0-140 105 % <br /> MWA a20 S902231-20 SAW <br /> i <br /> Tert-butyl alcohol 9020258 2/22/99 2/22/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 1.52 " <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tert-butyl ether 0.100 ND <br /> Aftrt-amyl methyl ether 0.100 ND " <br /> rrogate: 1,2-DCA-d4 " 60.0-140 91.6 % <br /> MWA 07d 5902231-21 SAW <br /> Tert-butyl alcohol 9020258 2/22/99 2/22/99 10.0 ND mg/kg <br /> Methyl tent-butyl ether 0.100 ND " <br /> Di-isopropyl ether 0.100 ND <br /> Ethyl tert-butyl ether 0.100 ND <br /> Tert-amyl methyl ether 0.100 ND <br /> Surrogate: 1,2-DCA-d4 60.0-140 92.8 % <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 8 of 15 <br /> Sandra R.Hanson,Client Services Representative <br />