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680 Chesapeake Drive Redwood City,CA 94063 (650)364-%00 FAX(650) 364-9233 <br /> Sequoia <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(92 5)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Pinnacle-C.P. Project: ARCO,5469, Stockton CA Sampled: 2/17/99 <br /> 3939 Cambridge Road,Ste.220 Project Number: N/A Received: 2/17/99 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Reported: 2/25,3/3/99 <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: 9020195 Date Prepared, 1./18/99 <br /> Extraction Method; EPA 't0 OB <br /> Blank 9020195-13LIK1 <br /> Lead 2/18/99 ND mg/kg 2.50 <br /> LCS 9020195-BS1 <br /> Lead 2/18/99 50.0 48.9 mg/kg 80.0-120 97.8 <br /> Matrix Spike 90201_ 95-MS S902229-02 <br /> Lead 2/18/99 50.0 11.5 60.0 mg/kg 80.0-120 97.0 D <br /> Matrix pike D-n 9020195-MSDI S902229-02 <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 /> Sequoia Analytical-Sacramento *Refer to end of report for test of notes and definitions. <br /> Ronald W. Bobel,Client Services Representative Page 7 of 9 <br />