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680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 4D Sequoia 404 N.Wlget 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 /> • <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2/25199 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 318199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/11/99 <br /> STLC CAM 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: 9030114 Extraction MtUMd- 9k1 -S1LC <br /> MuLk 9030114-131.K1 <br /> Lead 3/10/99 ND mg/l 0.500 D <br /> LCS 9030114-BS1 <br /> Lead 3/10/99 10.0 9.87 mg/1 80.0-120 98.7 D <br /> Matrix Spikc 90301]4-MS1 S9-03087-02 <br /> Lead 3110/99 10.0 21.8 30.7 mg/1 80.0-120 89.0 D <br /> Matrix spoke DUP 9030114-MS D I 5903087-02 <br /> Lead 3/10/99 10.0 21.8 30.4 mg/I 80.0-120 86.0 20.0 3.43 D <br /> 0 <br /> equoia Analytical-Sacramento *Refer to end of report for test of notes and definitions. <br /> Qr-Ja <br /> Sandra R.�Han,,41,,nt Services Representative Page 3 of 4 <br />