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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 /> 94954 (707) <br /> 865 FAX(707) <br /> Analytical 555 Inddu t al Beadell North,Ste.D San ICarlos ,,CCA 94070-4111 (650)Z32-9600 FAX(650) 232 96412 <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 UnitsNates* <br /> MW-2 QZO(continued) 5902231-10 &H <br /> Tert-amyl methyl ether 9020258 2/22/99 2/22/99 0.100 ND mg/kg <br /> Surrogate: 1,2-DCA-d4 60.0-140 92.8 % <br /> MW-z 6U5 S902231-11 sail <br /> Tert-butyl alcohol 9020258 2/22199 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 92.4 % <br /> MW-3 a10 S202231-13 SQU <br /> W-butyl alcohol 9020258 2/22/99 2/22199 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 88.0 % <br /> W-3 t20 S202231-15 5411 <br /> Tert-butyl alcohol 9020258 2/22/99 2122/99 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 93.2 % <br /> MA-3 (a)25 S902231-16 Sail <br /> Tert-butyl alcohol 9020258 2122/99 2/22/99 10.0 ND mg/kg <br /> Methyl tert-butyl ether 0.100 0.345 <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 /> Al R <br /> Sandra R. Hanson,Client Services Representative page 7 of 15 <br />