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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-%00 FAX(925)988-8673 <br /> 819 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 1 <br /> 1551 Industrial Road San Carlos,CA 94070-41 1 1 (650)232-9600 FAX(650)232-9612 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 4/13199 <br /> 9912 Business Park Drive,Ste. 100 Project Number: NIA Received: 4/14199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 4128/99 <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 /> RaUlr: 9040225 pate Prepared: 4120199 Extraction Method: EPA 30508 <br /> Blank 9040225-R1.K1 <br /> Cadmium 4121/99 ND mg/kg 0.250 <br /> Chromium ND 0.250 <br /> Lead ND 2.50 <br /> Nickel ND 1,00 <br /> Zinc ND 0.500 <br /> LCS 9040225-BS1 <br /> Cadmium 4/21/99 50.0 48.2 mg/kg 80.0-120 96.4 <br /> Chromium 50.0 48.3 80.0-120 96.6 <br /> Lead 50.0 50.6 80.0-120 101 <br /> Nickel 50.0 49.5 80.0-120 99.0 <br /> Zinc 50.0 49.1 80.0-120 98.2 <br /> 9040225-MSI 04207-01 <br /> 14Fadmium 4/21199 50.0 ND 46.9 mg/kg 80.0-120 93.8 D <br /> Chromium 50.0 15.5 61.9 80.0-120 92.8 D <br /> Lead 50.0 ND 52.7 80.0-120 105 D <br /> Nickel 50.0 ND 49.5 80.0-120 99.0 D <br /> Zinc 50.0 108 160 80.0-120 104 D <br /> Matrix Spike Aun 9040225-MSD2 5904207-01 <br /> Cadmium 4/21/99 50.0 ND 48.4 mg/kg 80.0-120 96.8 20.0 3.15 D <br /> Chromium 50.0 15.5 62.6 80.0-120 94.2 20.0 1.50 D <br /> Lead 50.0 ND 53.7 80.0-120 107 20.0 1.89 D <br /> Nickel 50.0 ND 512 80.0-120 102 20.0 2.99 D <br /> Zinc 50.0 108 156 80.0-120 96.0 20.0 8.00 D <br /> 'qWquota Analytical -Sacramento *Refer to end of report for text of nates and definitions. <br /> Sandra R. Hanson, Client Services Representative Page 13 of 19 <br />