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819 Striker Avenue,Suite 8 <br /> Sequoia Sacrament -%W <br /> (9166)929Z 1-9600 <br /> FA <br /> Analytical vdX(916)921-0100 <br /> ww.seQuoialabs.com <br /> SECOR International-Rancho Cordova Project: ARCO 4493, Stockton,CA Sampled: 612100 <br /> 3017 Kilgore Road,Suite 100 Project Number: NIA Received: 616100 <br /> Rancho Cordova,CA 95670 Project Manager_ Rusty Renkosky Re rted: 618100 <br /> Total:Metals=by=EPA.60001-7000=Ser.ies=Methods/Qual ity-Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> IAnalyte Anal zed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 0060043 Date Prepared: 615100 Extraction Method: EPA 3050B <br /> Blank 0060043-BLK 1 <br /> Lead 6/6/00 ND mg/kg 2.50 <br /> LCS 0060043-BSI <br /> Lead 616100 50.0 51.3 mg/kg 80.0-120 103 <br /> Matrix Spike 0060043-MSI 5006039-15 <br /> Lead 616/00 50.0 ND 49.8 mg/kg 80.0-120 99.6 D <br /> Matrix Spike Dup 0060043-MSD1 5006039-15 <br /> Lead 616/00 50.0 ND 51.2 mg/kg 80.0-120 102 20.0 2.38 D <br /> 0 <br /> 0 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 5 of 6 <br />