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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 - <br /> l Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988-9673 <br /> $19 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0 100 <br /> 455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> Analytical 11551 551 Industrial Road San Carlos CA 94070-411 l (650) Z32 9600 FAX(650)232-9612 <br /> 1. <br /> SECOR International Project ARCO 2133, Stockton,CA Sampled 3/15/99 <br /> 9912 Business Park Drive, Ste 100 Project Number 7G600-079-04 Received 3/16/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 4/1/99 <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 /> Y-8-4' S903219,-24 $911 <br /> Tert-butyl alcohol 9030385 3/26199 3126199 100 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 /> Ethanol 150 ND " <br /> Surrogate 1 2-DCA-d4 600-140 82 0 <br /> Y-_2-4' 5903219-25 sad <br /> Tert-butyl alcohol 9030385 3/26/99 3129/99 100 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 /> t-amyl methyl ether 0 100 ND <br /> nol 150 ND " <br /> urrogate 12-DCA-d4 600-140 767 % <br /> srquoia Analytical -Sacramento *Refer to end of report for text of notes and definitions <br /> andra R Hanson,Client Services Representative Page 14 of 22 <br />