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680 Chesapeake Drive P edwood 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)921-0100 <br /> 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)Z3Z-9600 FAX(650) 232-9612 <br /> SECOR Intemational Project: ARCO 4493,Stockton,CA Sampled: 2/10/99 to 2112199 <br /> 9912 Business Park Drive,Ste. 100 Project Number: NIA Received: 2116199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 312/99 <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 /> Anal to Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9020195 Date Prepared: 2118199 Extraction Method: EPA 30508 <br /> Blank 9 95-SLKI <br /> Lead 2/18/99 ND mg/kg 2.50 <br /> LS-S 9020195-13SI <br /> Lead 2118/99 50.0 48.9 mg/kg 80.0-120 97.8 <br /> Matrix Spike 9020195-MSI 5902229-02 <br /> Lead 2118/99 50.0 11.5 60.0 mg/kg 80.0-120 97.0 D <br /> Matrix Spike Duo 9020195-MSDI S902224-02 <br /> Lead 2/18/99 50.0 11.5 74.3 mg/kg 80.0-120 126 20.0 26.0 2,3,D <br /> Batch: 90202.66 Date Prepared: 2/24199 Extraction Method: EPA 305011 <br /> 9020266-E .KI <br /> �d 2/24/99 ND mg/kg 2.50 <br /> LCE 9020266-13SI <br /> Lead 2124/99 50.0 47.6 mg/kg 80.0-120 95.2 <br /> Matrix Spike 2020266-MSI S902263-02 <br /> Lead 2/24/99 50.0 23.6 76.9 mg/kg 80.0-120 107 D <br /> Matrix Spike Pup 9020266-M5D1 5902263-02 <br /> Lead 2/24/99 50.0 23.6 56.2 mglkg 80.0-120 65.2 20.0 48.5 2,3,D <br /> equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> �- R b/fes <br /> Sandra R.Hanson,Client Services Representative Page 13 of 15 <br />