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1 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Secor International Project Unocal 8671,Stockton,CA Sampled 5/11/98 <br /> 9912 Business Park Drive,Ste 100 Project Number N/A Received 5/19/98 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 5/20/98 <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 8050190 Date Prepared, 5/19198 Extraction Method EPA 305013 <br /> Blank $Q5012U BJrKI <br /> Lead 5/19/98 ND mg/kg 250 <br /> LSU 8950190-BSI <br /> Lead 5/19/98 500 479 mg/kg 800-120 95 8 <br /> Matrix Spike 8050190-MS1 S805184-00 <br /> Lead 5/19/98 500 ND 448 mg/kg 800-120 896 <br /> Matrix Spike Dun 8050190-MSD1 5805184-00 <br /> Lead 5119/98 Soo ND 442 mg/kg 800-120 884 200 135 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> /da bnetder, aboratory Director Page 3 of 4 <br />