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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)921-01(X1 <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 411 1 (6SO)232-9600 FAX(650)232 9612 <br /> lie <br /> SECOR International Project ARCO 2133,Stockton,CA Sampled 3118/99 <br /> 9912 Business Park Drive,Ste 100 Project Number 7G600-019-04 Received 3118/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 411/99 <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. 9030385 Date Prepared, 3126199 Extraction Method, EPA 543013 [MeOHI <br /> Blank 9030385-13LK1 <br /> Tert-butyl alcohol 3/26/99 ND mg/kg 100 <br /> Methyl tert-butyl ether ND 0 100 <br /> D1-isopropyl ether ND 0 100 <br /> Ethyl tent-butyl ether ND 0 100 <br /> Tert-amyl methyl ether ND 0 100 <br /> Ethanol ND 150 <br /> Surrogate 1 2-DCA-d4 300 2 73 600-140 910 <br /> LCS 9030385-BSI <br /> Methyl tert-butyl ether 3/26/99 250 2 56 mg/kg 700-130 102 <br /> Surrogate 12-DCA-d4 3 00 260 600-140 867 <br /> 90303185—MSI S903219-17 <br /> lyl tert-butyl ether 3/26/99 250 9 88 11 6 mg/kg 600-140 688 <br /> r-rogate 1 2-DCA-d4 11300 220 600-140 733 <br /> Matrix Spike Dun 9030385-MSD1 S903219-17 <br /> Methyl tert-butyl ether 3/26/99 250 988 108 mg/kg 600-140 368 250 606 2,3 <br /> Surrogate 12-DCA-d4 " 300 220 11600-140 733 <br /> Batch. 9030387 Date Prepared. 3129/99 Extraction Method, EPA 50308 [MeOHl <br /> Blank 9030387-BLKI <br /> Tert-butyl alcohol 3/29/99 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 ISO _ <br /> Surrogate 12-DCA-d4 250 256 600-140 102 <br /> LC.5 9030387-BSI <br /> Methyl tert-butyl ether 3/29/99 250 235 mg/kg 700-130 940 <br /> Surrogate 12-DCA-d4 11250 261 600-140 104 <br /> MOtrax Spike 9030U-MSI 5903255-05 <br /> Methyl tert-butyl ether 3129/99 250 124 409 mg/kg 600-140 NR 4 <br /> Surrogate 12-DCA-d4 11250 248 600-140 992 <br /> Matrix Spike Duo 9030387-MSDI 5903255-05 <br /> rhyl tert-butyl ether 3/29/99 250 124 396 mg/kg 600-140 NR 250 4 <br /> 301moia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Sandra R Hanson,Client Services Representative Page 9 of l I <br />