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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)921-0 100 <br /> 455 Analytical 1551 Industrial ll Blvdioad.North.Ste.0 San/uma,CACarlos,CA94070-4111 (650)232-4954 (707) 1865 FAX(707)792-0342 <br /> 9600 FAX(6 0)232-9612 <br /> i <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2112/99 <br /> 9912 Business Park Drive, Ste. 100 Project Number: NIA Relogged: 3/10199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3/17/99 <br /> TCLP Metals by EPA 1311/6000/7000 Series Methods/Quality Control <br /> Sequoia AnaIytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9030177 Date Prepared-, 3/16/99 Extraction Method: EPA 30IQA TCLP_ <br /> Blank9030177-BLKI <br /> Lead 3/16/99 ND mg/l 0.100 <br /> L.CS 9030177-01 <br /> Lead 3116/99 2.00 2.00 mg/I 80.0-120 100 <br /> Matrix Spike 9030177-MSI S903187-01 <br /> Lead 3116/99 2.00 ND 2.03 mgll 80.0-120 101 <br /> Matrix Spike Duo 9030177-MSD1 S903187-01 <br /> Lead 3/16199 2.00 ND 2.00 mg/l 80.0-120 I00 20.0 0.995 <br /> 0 <br /> quota Analytical-Sacramento *Refer to end of report for test of notes and definitions. <br /> Sandra R. Hanson,Client Services representative Page 3 of 4 <br />