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Sequoia 6:3o Chesapeake Drive Red wood 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)921-0100 <br /> Analytical 1555 McDowell <br /> IIR Blvd.North,Ste.D SaPetaluma, <br /> (Carlos,CA 94070-411 1 (6 0)232-9600 FAX(650) 232-96865 FAX(707) 42 <br /> SECOR International Project: ARCO 4493, Stockton,CA Sampled: 4113199 <br /> 9912 Business Park Drive, Ste 100 Project Number: NIA Received: 4/14/99 <br /> Sacramento,CA 95827 Project Manager: Rust 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 /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Nates* <br /> Matrix Spik�J)UP(continued) 9040167-MSD1 5904168-02 <br /> Zinc 4/15/99 50.0 14.1 59.1 mg/kg 80.0-120 90.0 20.0 7.07 D <br /> match: 9040168 Date Prepared: 4/15/99 Exlracti= Method; ERA 7471 A <br /> Blank 9940168-BLKI <br /> Mercury 4/16/99 ND mg/kg 0.0200 <br /> L ICS 9040168-BS 1 <br /> Mercury 4/16/99 0.417 0.421 mg/kg 80.0-120 101 <br /> Matrix Spike 9040168-MS1 S904164-01 <br /> Mercury 4116199 0.417 0.0583 0.447 mg/kg 75.0-125 93.2 <br /> Matrix Spike Dup 9040168-MSD1 S904164-01 <br /> rcury 4/16/99 0.417 0.0583 0.470 mg/kg 75.0-125 98.7 20.0 5.73 <br /> equoia Analytical-Sacramento 'Refer to end of report fpr text of notes and definitions. <br /> Sandra R. Hanson,Client Services Representative Page 8 of 12 <br />