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680 Chesape-ke 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 /> 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 4493,Stockton,CA Sampled: 2/24/99 to 2/25/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 2/26/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/5/99 <br /> Total Metals by EPA 6000/7000 Series Methods/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: 9030010 Date Prepared: 3/1199 Extraction Method: Epi,3050H <br /> Blank 9030010-BLKI <br /> Lead 3/2/99 ND mg/kg 2.50 <br /> LICS 90010-BS1 <br /> Lead 3/2/99 56.0 48.7 mglkg 80.0-120 97.4 <br /> Matrix Spike 9030010-MS1 5902337-01 <br /> Lead 3/2/99 50.0 24.9 77.2 mg/kg 80.0-120 105 D <br /> Matrix Spike un 9030010-MSD1 S902337-01 <br /> Lead 3/2/99 50.0 24.9 70.4 mg/kg 80.0-120 91.0 20.0 14.3 D <br /> Oqu—oia Analytical -Sacramento *Refer to end of report for test of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 17 of 21 <br />