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Alpha Analytical Laboratories, Inc. email: clientservices@alpha-labs.com Corporate: 208 Mason Street I Ukiah, CA 95482 I T: 707-468-0401 I F: 707-468-5267 I ELAP# 1551 Shimmick Construction Project Manager: Hagr Balla 8201 Edgewater Dr., Suite 202 Project: Smith Canal Reported: Oakland, CA 94621 Project Number: CCR 66261.24 Tables land II 10/15/20 15:17 STLC Metals by EPA 6000/7000 Series Methods - Quality Control Ana lyte(s) Result Reporting Limit Units Spike Source Level Result %REC %REC RPD Limits RPD Limit Flag Batch A104522 - WET/3015 Blank (4104522-BLK1) Prepared: 10/12/20 Analyzed: 10/13/20 Antimony ND 1.0 mg/L Arsenic ND 0.10 mg/L Barium ND 1.0 mg/L Beryllium ND 0.050 mg/L Cadmium ND 0.10 mg/L Chromium ND 0.10 mg/L Cobalt ND 1.0 mg/L Copper ND 0.20 mg/L Lead ND 0.50 mg/L Molybdenum ND 0.10 mg/L Nickel ND 0.10 mg/L Selenium ND 0.10 mg/L Silver ND 0.50 mg/L Thallium ND 0.10 mg/L Vanadium ND 0.20 mg/L Zinc ND 0.50 mg/L LCS (A104522-BS1) Prepared: 10/12/20 Analyzed: 10/13/20 Antimony 0.212 1.0 mg/L 0.222 95.6 85-115 Arsenic 0.221 0.10 mg/L 0.222 99.3 85-115 Barium 0.219 1.0 mg/L 0.222 98.7 85-115 Beryllium 0.229 0.050 mg/L 0.222 103 85-115 Cadmium 0.205 0.10 mga., 0.222 92.3 85-115 Chromium 0.243 0.10 mg/L 0.222 109 85-115 Cobalt 0.207 1.0 mg/L 0.222 93.0 85-115 Copper 0.243 0.20 mg/L 0.222 110 85-115 Lead 0.203 0.50 mg/L 0.222 91.2 85-115 Molybdenum 0.208 0.10 mg/L 0.222 93.8 85-115 Nickel 0.222 0.10 mg/L 0.222 100 85-115 Selenium 0.214 0.10 mg/L 0.222 96.5 85-115 Silver 0.234 0.50 mg/L 0.222 105 85-115 Thallium 0.216 0.10 mg/L 0.222 97.0 85-115 Vanadium 0.226 0.20 mg/L 0.222 102 85-115 Zinc 0.209 0.50 mg/I. 0.222 94.1 85-115 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. Page 7 of 23