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Sequoia 68u Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 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)92 1-0 100 <br /> Analytical 1455 McDowell Blvd. North,Ste. D Petaluma,CA 94954 <br /> (707)792-1865 fAX(707)792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-41 1 1 (650)232-9600 <br /> FAX(650)232-9612 <br /> Pinnacle-C.P. Project: ARCO,5469,Stockton CA Sampled: 2/1 1/99 <br /> 3939 Cambridge Road,Ste. 220 Project Number: N/A <br /> Cameron Park,CA 95682Received: 2/12/99 <br /> Project Manager: Mark Capps Reported: 3/1/99 <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: 9020179 Date Prepared! 2/16/99 _Extraction Method,• FPA 3050B <br /> Blank 9020179-B .Kl <br /> Lead 2/17/99 ND mg/kg 2.50 <br /> ISS 9020179-BSI <br /> Lead 2/17/99 50.0 47.8 mg/kg 80.0-120 95.6 <br /> Matrix Spiko 90201_ 79-Ms1 5902038-02 <br /> Lead 2/17/99 50.0 4.53 51.7 mg/kg 80.0-120 94.3 <br /> Matrix Sp4ke Duo 9020179-MSD! S902038-02 <br /> Lead 2/17/99 50.0 4.53 51.1 mg/kg 80.0-120 93.1 20.0 1.28 <br /> sequoia Analytical-Sacramento *Refer-to end of report for text ofnotes and definitions. <br /> onald W. Bobel,Client Services Representative <br /> Page 13 of 15 <br />