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Alpha VAnalytical Laboratories, Inc. email: clientservices©alpha-labs.com <br />Corporate: 208 Mason Street I Ukiah, CA 95482 I T: 707-468-0401 I F: 707-468-5267 I ELAP# 1551 <br />Shimmick Construction Project Manager: Hagr Balla <br />8201 Edgewater Dr., Suite 202 <br /> <br />Project: Smith Canal <br /> Reported: <br />Oakland, CA 94621 <br /> <br />Project Number: CCR 66261.24 Tables I and II <br /> 10/15/20 15:17 <br />DI WETMetals by EPA 6000/7000 Series Methods - Quality Control <br />Reporting Spike Source %REC <br /> RPD <br />Analyte(s) <br /> Result Limit Units Level Result %REC Limits RPD Limit Flag <br />Batch A104528 - DIWET/7196A <br />Blank (A104528-BLK1) <br />Chromium, hexavalent <br /> <br />Prepared & Analyzed: 10/01/20 <br />ND 0.010 mg/L <br /> <br />LCS (A104528-BS1) <br />Chromium, hexavalent <br /> <br />Prepared 8c Analyzed: 10/01/20 <br />0.100 0.010 mg/L 0.100 100 <br /> <br />80-120 <br />Duplicate (A104528-DUPD <br /> Source: 2013191-02 <br /> Prepared & Analyzed: 10/01/20 <br />Chromium, hexavalent ND 0.010 mg/L ND 20 <br />Matrix Spike (AI04528-MS1) Source: 2013191-02 Prepared & Analyzed: 10/01/20 <br /> <br />Chromium, hexavalent 0.100 0.010 mg/L 0.100 ND 100 0-200 <br />Matrix Spike Dup (A104528-MSD1) Source: 2013191-02 Prepared 8c Analyzed: 10/01/20 <br /> <br />Chromium, hexavalent 0.0983 0.010 mg/L 0.100 ND 98.3 0-200 2.21 20 <br />The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. <br />Page 14 of 23