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680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364 9233 <br /> a 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Sequoi <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> ArAff Analytical 1455 McDowell Blvd. North,Ste. D Petaluma,CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> ]551 Industrial Road San Carlos,CA 94070-4111 (650)232-96W FAX(650)232-9612 <br /> 0 <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 3/10/99 <br /> 9912 Business Park Drive, Ste. 100 Project Number: 7G600-022-02 Received: 3/11/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/15/99 <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: 9030124 Date Prepared: 3/11/99 Extraction Method, EPA 3050B <br /> filanli 9030124-BL K 1 <br /> Lead 3/11/99 ND mg/kg 2.50 <br /> LCS 9030124-BSI <br /> Lead 3/11199 50.0 48.1 mg/kg 80.0-120 96.2 <br /> Matrix Spike 9030124-MSI 5903135-02 <br /> Lead 3/11/99 50.0 299 415 mg/kg 80.0-120 NR 2,D <br /> Matrix Spike Dua 9030124-MS121 5903135-02 <br /> Lead 3/11/99 50.0 299 569 mg/kg 80.0-120 NR 20.0 2,D <br /> 9'quoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson, tient Services Representative Page 5 of 6 <br />