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Alpha YAnalytical 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 Project: Smith Canal Reported: <br />Oakland, CA94621 Project Number: CCR 66261.24 Tables land II 10/15/20 15:17 <br />STLC Metals by EPA 6000/7000 Series Methods - Quality Control <br />Reporting Spike Source %REC RPD <br />Analyte(s) Result Limit Units Level Result %REC Limits RPD Limit Flag <br />Batch A104522 - WET/3015 <br />Duplicate (A104522-DUP1) Source: 2013191-02 Prepared: 10/12/20 Analyzed: 10/13/20 <br />Antimony ND 1.0 mg/L ND 20 <br />Arsenic ND 0.10 mg/L ND 20 <br />Barium ND 1.0 mg/L ND 0.848 20 <br />Beryllium ND 0.050 mg/L ND 20 <br />Cadmium ND 0.10 mg/L ND 20 <br />Chromium ND 0.10 mg/L ND 20 <br />Cobalt ND 1.0 mg/L ND 20 <br />Copper ND 0.20 mg/L ND 20 <br />Lead ND 0.50 mg/L ND 20 <br />Molybdenum ND 0.10 mg/L ND 20 <br />Nickel ND 0.10 mg/L ND 20 <br />Selenium ND 0.10 mg/L ND 20 <br />Silver ND 0.50 mg/L ND 20 <br />Thallium ND 0.10 mg/L ND 20 <br />Vanadium ND 0.20 mg/L ND 20 <br />Zinc ND 0.50 mg/L ND 20 <br />Matrix Spike (A104522-MS1) <br /> Source: 2013191-02 Prepared: 10/12/20 Analyzed: 10/13/20 <br />Antimony 0.222 1.0 mg/L 0.222 ND 99.8 70-130 <br />Arsenic 0.234 0.10 mg/L 0.222 ND 105 70-130 <br />Barium 0.251 1.0 mg/L 0.222 ND 97.2 70-130 <br />Beryllium 0.230 0.050 mg/L 0.222 ND 103 70-130 <br />Cadmium 0.204 0.10 mg/L 0.222 ND 92.0 70-130 <br />Chromium 0.220 0.10 mg/L 0.222 ND 98.9 70-130 <br />Cobalt 0.208 1.0 mg/L 0.222 ND 93.4 70-130 <br />Copper 0.261 0.20 mg/L 0.222 ND 118 70-130 <br />Lead 0.201 0.50 mg/L 0.222 ND 90.4 70-130 <br />Molybdenum 0.215 0.10 mg/L 0.222 ND 96.7 70-130 <br />Nickel 0.218 0.10 mg/L 0.222 ND 98.3 70-130 <br />Selenium 0.212 0.10 mg/L 0.222 ND 95.3 70-130 <br />Silver 0.233 0.50 mg/L 0.222 ND 105 70-130 <br />Thallium 0.217 0.10 mg/L 0.222 ND 97.5 70-130 <br />Vanadium 0.233 0.20 mg/L 0.222 ND 105 70-130 <br />Zinc 0.208 0.50 mg/L 0.222 ND 93.4 70-130 <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 8 of 23