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Sequoia °Chesapeake Drive Redwood City,CA 94063 (650)364-5500 FAX(650)364-9233 <br /> 404 N.1Mget 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 /> 1551 Industrial Road San Carlos,CA 94070-41 11 (650)232-9600 FAX(650)232-9612 <br /> • <br /> SFCOR International Project: ARCO 4493,Stockton,CA Sampled: 4113/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: NIA Received: 4/14/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 4119/99 <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 /> lAnalyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9040167 Datcfrcpared: 4/15199 Extraction Mcthgd; EPA 3050B <br /> RIank 9040167-BLKI <br /> Antimony 4/15/99 ND mg/kg 2.50 <br /> Lead ND 2.50 <br /> Arsenic ND 2.50 <br /> Barium ND 2.50 <br /> Beryllium ND 0.250 <br /> Cadmium ND 0.250 <br /> Chromium ND 0.250 <br /> Cobalt ND 1.00 <br /> Copper ND 0.250 <br /> Lead ND 2.50 <br /> Molybdenum ND 1.00 <br /> Nickel ND 1.00 <br /> 0 plum ND 2.50 <br /> er ND 0.250 <br /> Thallium ND 2.50 <br /> Vanadium ND 1.00 <br /> Zinc ND 0.500 <br /> LCIS 9040167-BS 1 <br /> Lead 4115199 50.0 46.9 mg/kg 80.0-120 93.8 <br /> Arsenic 50.0 45.8 80.0-120 91.6 <br /> Cadmium 50.0 46.7 80.0-120 93.4 <br /> Chromium 50.0 47.5 80.0-120 95.0 <br /> Nickel 50.0 47.2 80.0-120 94.4 <br /> Zinc 50.0 47.0 80.0-120 94.0 <br /> Matrix Spike 9040167-MS1 S904168-02 <br /> Lead 4/15199 50.0 15.2 58.6 mg/kg 80.0-120 86.8 D <br /> Arsenic 50.0 26.6 71.8 80.0-120 90.4 D <br /> Cadmium 50.0 ND 45.2 80.0-120 90.4 D <br /> Chromium 50.0 3.80 49.9 80.0-120 92.2 D <br /> Nickel 50.0 ND 49.2 80.0-120 98.4 D <br /> Zinc 50.0 14.1 62.4 80.0-120 96.6 D <br /> Matrix Spike Duo 9040167-MSD1 S904168-02 <br /> Lead 4/15/99 50.0 15.2 57.3 mg/kg 80.0-120 84.2 20.0 3.04 D <br /> Arsenic 50.0 26.6 68.8 80.0-120 84.4 20.0 6.86 D <br /> Cadmium 50.0 ND 44.8 80.0-120 89.6 20.0 0.889 D <br /> Chromium 50.0 3.80 48.9 80.0-120 90.2 20.0 2.19 D <br /> kel 50.0 ND 48.1 80.0-120 96.2 20.0 2.26 D <br /> equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 7 of 12 <br />