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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)92 1-0 100 <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 2133,Stockton,CA Sampled 3/15/99 <br /> 9912 Business Park Drive, Ste 100 Project Number 7G600-079-04 Received 3116199 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 4/1/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes" <br /> Batch, 9030275 Date Prepared. 3122/99 Extraction Method. EPA 50308 I[11eOHl <br /> $lank 9030275-BL K I <br /> Tert-butyl alcohol 3/22/99 ND mg/kg 100 <br /> Methyl tert-butyl ether ND 0 100 <br /> Di-isopropyl ether ND 0 100 <br /> Ethyl tert-butyl ether ND 0 100 <br /> Tert-amyl methyl ether ND 0 100 <br /> Ethanol ND 150 <br /> Surrogate 12-DCA-d4 250 242 600-140 968 <br /> LSA 9030275-BSI <br /> Methyl tert-butyl ether 3/22/99 250 255 mg/kg 700-130 102 <br /> Surrogate 1 2-DCA-d4 11 250 258 600-140 103 <br /> ]Untrir Sm 9030275-MSI S903213-01 <br /> hyl tert-butyl ether 3/22/99 250 ND 239 mg/kg 600-140 956 <br /> arrogate 12-DCA-d4 11 250 240 600-140 960 <br /> Matrix spike Dun 9030275-MSD1 5903213-01 <br /> Methyl tert-butyl ether 3/22/99 250 ND 2 21 mg/kg 600-140 884 250 783 <br /> Surrogate 1 2-DCA-d4 11 250 225 600-140 900 <br /> Batch, 9030385 Date Prepared, 3126199 Extraction Method., EPA 5030B JMeQM <br /> Blank 9030385-BLK1 <br /> Tert-butyl alcohol 3126199 ND mg/kg 100 <br /> Methyl cert-butyl ether ND 0 100 <br /> Di-isopropyl ether ND 0 100 <br /> Ethyl tert-butyl ether ND 0100 <br /> Tert-amyl methyl ether ND 0100 <br /> Ethanol ND 150 <br /> Surrogate 12-DCA-d4 3 00 2 73 600-140 910 <br /> LSU 9030385-BSI <br /> Methyl tert-butyl ether 3126/99 250 256 mg/kg 700-130 102 <br /> Surrogate 12-DCA-d4 11 300 2 60 600-140 867 <br /> Matnx Spike 9030385-MS1 S903219-17 <br /> Methyl tert-butyl ether 3/26/99 250 9 88 11 6 mg/kg 600-140 688 <br /> Surrogate 12-DCA-d4 11300 220 600-140 733 <br /> Matrix Spike Dun 9030385-MSDI 5903219-17 <br /> thyI tert-butyl ether 3/26/99 2 50 9 88 108 mg/kg 600-140 36 8 25 0 606 3,4 <br /> srquoia Analytical-Sacramento *Refer to end of report jar text of notes and definitions <br /> (i Sandra R Hanson,Client Services Representative Page 20 of 22 <br />