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Sequoia w Chesapeake Drjve 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 /> 619 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 /> Project UnocaVTosco Sampled 2/1199 to 2/2/99 <br /> gDigital Dr Suite 6 Project Number 227903/Unocal 5098 Received 2/3/99 <br /> ovato,CA 94949 Pro ect Manager Mark Dockum Reported 2/18199 <br /> Total Metals by EPA 6000/7000 Series Methods/Quality Control <br /> Sequoia Analytical-Petaluma <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> alyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 9020209 Date Prepared 2/10199 Extraction Method EPA 3050B <br /> lank 9020209-BLKI <br /> lead 2/10/99 ND mg/kg 750 <br /> fd <br /> 9020204-BS1 <br /> 2/10/99 500 Soo mg/kg 800-120 100 <br /> Matrix Spike 9020209-MSI P902150-01 <br /> lad 2/10199 455 ND 410 mg/kg 750-125 901 <br /> Atrix Spike Du <br /> „pn 9020209-MSD/ P9021 50-01 <br /> Lead 2/10/99 48 1 ND 441 mg/kg 750-125 917 200 176 <br /> 1 <br /> ia Analytical-Petaluma *Refer to end of report for test of notes and definitions <br /> Page 23 of 24 <br />