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Sequoia 680 Chesapeake Drive Redwood City CA 9401 (415) 364-9600 FAX(415) 364.9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 9459b (510) 988-9600 FAX(510)988.9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> TAW Analytical <br /> Kleinfelder-Stockton Project: N/A Sampled: 7/16/98 <br /> 2825 East Myrtle Street Project Number: 20-4202-O1.PO2 Received: 7/20/98 <br /> Stockton,CA 95205 Project Manager: Tony Martin Reported: 8/11/98 <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 Analvzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 8070308 Date Prepared: 7/73/98 Extraction Method: EPA 7471A <br /> Blank 8070308-BLKI <br /> Mercury 7/23/98 ND mg/kg 0.0200 <br /> ILS 8070308-BSI <br /> Mercury 7/23/98 0.417 0.402 mg/kg 80.0-120 96.4 <br /> Matrix Spike 8070308-MS1 5807216-07 <br /> Mercury 7/23/98 0.417 0.0467 0.433 mg/kg 75.0-125 92.6 <br /> Matrix Spike Duo 8070308-NISDI 5807216-07 <br /> Mercury 7/23/98 0.417 0.0467 0.437 mg./kg 75.0-125 93.6 20.0 1.07 <br /> Batch: 8070326 Date Prepared: 7/24/98 Extraction Method: EPA 3050B <br /> Blank 8070326-BLKI <br /> Antimony 7/25/98 ND mg/kg 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 /> Selenium ND 2.50 <br /> Silver ND 0.250 <br /> Thallium ND 2.50 <br /> Vanadium ND 1.00 <br /> Zinc ND 0.500 <br /> Lfs 8070326-13S1 <br /> Arsenic 7/25/98 50.0 47.5 mg/kg 80.0-120 95.0 <br /> Cadmium 50.0 47.8 80.0-120 95.6 <br /> Chromium 50.0 48.3 80.0-120 96.6 <br /> Nickel 50.0 48.7 80.0-120 97.4 <br /> Zinc 50.0 48.6 80.0-120 97.2 <br /> Matrix Spike 8070326-NISI 5807216-07 <br /> Arsenic 7/25/98 50.0 ND 44.9 mg/kg 80.0-120 89.8 D <br /> Cadmium 50.0 ND 41.6 80.0-120 83.2 D <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> =Vnda C.Schneider,Laboratory Director Page 19 of 25 <br />