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Sequoia 680 Chesapeake Drive Redwood City,CA 91'063 (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 McDowell Blvd. North,Ste. D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Analytical ',551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2/24/99 to 2/25/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: NIA Received: 2/26/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/5/99 <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 /> 2-6(continued) S903005- <br /> SAW <br /> Surrogate: 1,2-DCA-d4 60.0-140 93.2 % <br /> L-4--5 S903005-16 SAW <br /> Tert-butyl alcohol 9030021 3/1/99 313/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 0.194 " <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 96.8 % <br /> fl-1 5903005-19 SAW <br /> 4 butyl alcohol 9030021 3/1/99 3/3/99 10.0 ND mg/kg <br /> hyl Cert-butyl ether 0.100 ND " <br /> Di-isopropyl ether 0.100 ND <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Ter -amyl methyl ether 0.100 ND " <br /> Surrogate: 1,2-DCA-d4 60.0-140 98.8 % <br /> EG--1 S903005-20 SOE <br /> Tert-butyl alcohol 9030021 3/l/99 3/3/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 ND " <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 98.8 % <br /> PC-3 5903005-21 sad <br /> Tert-butyl alcohol 9030021 3/l/99 3/3/99 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 98.4 % <br /> PG-4 5903005-22 S 2 <br /> -butyl alcohol 9030021 311/99 3/3/99 10.0 ND mg/kg <br /> equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson, Client Services Representative Page 13 of 21 <br />