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Alpha YAnalytical Laboratories, Inc. email: clientservices@alpha-labs.com Corporate: 208 Mason Street I Ukiah, CA 95482 I T: 707468-0401 I F: 707-468-5267 I ELAP# 1551 Shimmick Construction 8201 Edgewater Dr., Suite 202 Oakland, CA 94621 Project Manager: Hagr Balla Project: Smith Canal Project Number: CCR 66261.24 Tables I and ll Reported: 10/15/20 15:17 Result Reporting Limit Dilution Batch Prepared Analyzed ELAP# Method Note Background (2013191-01) Sample Type: Water Sampled: 09/28/20 08:55 TCLP Chlorinated Herbicides by EPA Method 8151A 2,4-D ND mg/L 10 1 AJ03470 10/08/20 13:45 10/13/2004:46 1551 EPA 8151A 2,4,5-TP (Silvex) ND mg/L 1.0 1 AJ03470 10/08/2013:45 10/13/2004:46 1551 EPA 8151A Surrogate: DCAA 106% 54-124 AJ03470 10/08/2013.45 10/13/2004:46 1551 EPA 8151A TCLP Semivolatile Organic Compounds by EPA Method 8270C 2,4-Dinitrotoluene ND mg/L 0.13 1 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C Hexachlorobenzene ND mg/L 0.13 1 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C Hexachlorobutadiene ND mg/L 0.50 1 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C Hexachloroethane ND mg/L 3.0 1 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C 2-Methylphenol (o-cresol) ND mg/L 200 1 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C 3 & 4-Methylphenol (m & p-cresol) ND mg/L 200 1 AJ03433 10/08/20 06:59 10/15/2001:10 1551 EPA 8270C Methylphenol (Cresols), Total ND mg/L 200 1 AJ03433 10/08/2006:59 10/15/2001:10 1551 EPA 8270C Nitrobenzene ND mg/L 2.0 1 AJ03433 10/08/2006:59 10/15/2001:10 1551 EPA 8270C Pentachlorophenol ND mg/L 100 1 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C Pyridine ND mg/L 5.0 1 AJ03433 10/08/2006:59 10/15/2001:10 1551 EPA 8270C 2,4,5-Trichlorophenol ND mg/L 400 1 AJ03433 10/08/20 06:59 Ion sno 01:10 1551 EPA 8270C 2,4,6-Trichlorophenol ND mg/L 2.0 1 AJ03433 10/08)2006:59 10/15)2001:10 1551 EPA 8270C Surrogate: 2-F1uorobiphenyl 88.7% 27-119 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C Surrogate: 2-F1uorophenol 54.6 % 7-85 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C Surrogate: Nitrobenzene-d5 83.2 % 15-314 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C Surrogate: p-Terphenyl-d14 69.3 % 36-141 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C Surrogate: Phenol-d6 33.9% 1-65 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C Surrogate: 2,4,6-Tribromophenol 80.7% 4-168 AJ03433 10/08/20 06:59 10/15/20 01:10 1551 EPA 8270C Cofferdam (2013191-02) Sample Type: Water Sampled: 09/28/20 09:15 STLC Metals by EPA 6000/7000 Series Methods Antimony ND mg/L 1.0 1 A104522 10/12/2016:00 10/13)2015:39 1551 EPA 6010B Arsenic ND mg/L 0.10 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Barium ND mg/L 1.0 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Beryllium ND mg/L 0.050 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Cadmium ND mg/L 0.10 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Chromium ND mg/L 0.10 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Chromium, trivalent ND mg/L 0.10 1 A104522 10/12/20 16:00 10/14/20 13:45 1551 Calculation Cobalt ND mg/L 1.0 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Copper ND mg/L 0.20 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Lead ND mg/L 0.50 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Mercury ND mg/L 0.010 1 AJ03590 10/12)2010:10 10/12/20 15:39 1551 EPA 7470A Molybdenum ND mg/L 0.10 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Nickel ND mg/L 0.10 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Selenium ND mg/L 0.10 1 A104522 10/12/20 16:00 10/13/20 15:39 1551 EPA 6010B Silver ND mg/L 0.50 1 A104522 10/12/20 16:00 10/13/2015:39 1551 EPA 6010B Thallium ND mg/L 0.10 1 A104522 10/12/20 16:00 10/13)2015:39 1551 EPA 6010B 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 4 of 23