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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento, CA 95834 <br /> Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> EMCON-Sac Project: ARCO 2186,Stockton,CA Sampled: 6/17/99 <br /> 1433 N.Market Blvd. Project Number: N/A Received: 6/17/99 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 6/30/99 <br /> Total.Metals by.,EPA 6000/70KSeries Methods/QualityControl <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: 9060290 Date Prepared: 6/21/99 Extraction Method: EPA 3050B <br /> Blank 9060290-BL.KI <br /> Lead 6/22/99 ND mg/kg 2.50 <br /> Us 2060290-BSI <br /> Lead 6/22/99 50.0 48.9 mg/kg 80.0-120 97.8 <br /> Matrix Spike 9060290-MSI 5206308-06 <br /> Lead 6/22/99 50.0 12.2 52.2 mg/kg 80.0-120 80.0 D <br /> Matrix Spike Dup 9060290-M D] S906308-06 <br /> Lead 6/22/99 50.0 12.2 53.6 mg/kg 80.0-120 82.8 20.0 3.44 D <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 3 of 4 <br />