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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)921-0 100 <br /> Analytical 1551 d455 usrial Roall d San <br /> North,Ste.D Petaluma,arlos CA44954 (707)79Z-94070-4111 (650)232-1865 fAX(707)9600 FAX(650)232-9612 <br /> i <br /> SECOR International Project: ARCO 4493,Stockton,CA Sampled: 2/11/99 to 2/12/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 313199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 3110/99 <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: 9030073 D,,tte Prgpared: 3/5/99 traction Meth • T� itle,?-STS <br /> Blank 9030073-BLKI <br /> Lead 319/99 ND mg/1 0.500 D <br /> QU 9030073-BS1 <br /> Lead 3/9/99 10.0 9.82 mg/l 80.0-120 98.2 D <br /> Matrix Spike 9030073-MSl S902343-04 <br /> Lead 3/9/99 40.0 3.02 41.0 mg/1 80.0-120 95.0 D <br /> Matrix Spike Din 9030073-MSDI 5902343-04 <br /> Lead 3/9/99 40.0 3.02 41.1 mg/l 80.0-120 95.2 20.0 0.210 D <br /> uoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 3 of 4 <br />