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Excelchem Laboratories, Inc. Ancon Environmental Project: Stockton Diesel Spill 570 Business Park Dr. Project Number: 1043326 Date Reported: Lincoln, CA 95678 Project Manager: Nolan Ryan 08/07120 16:16 Total Recoverable Metals - Quality Control Analyte Result Reporting Limit Units Spike Source %REC Level Result %REC Limits RPD RPD Limit Notes Batch AAG0220 - EPA 6010B Matrix Spike Dup (AAG0220-MSD1) Source: 2007152-01 Prepared: 07/27/20 Analyzed: 07/28/20 Antimony 28.5 0.5 mg/kg 100 1.41 27.1 75-125 2.08 25 QM-01 Arsenic 84.5 0.5 .. 100 ND 84.5 75-125 1.51 25 Barium 222 0.5 F. 100 109 112 75-125 21.1 25 Beryllium 84.1 0.5 U 100 ND 84.1 75-125 1.31 25 Cadmium 86.9 0.5 100 ND 86.9 75-125 1.64 25 Chromium 109 0.5 U 100 22.5 86.5 75-125 1.28 25 Cobalt 92.9 0.5 .. 100 9.03 83.9 75-125 1.51 25 Copper 96.5 0.5 ,. 100 12.3 842 75-125 3.31 25 Lead 88.0 0.5 100 17.0 71.0 75-125 21.7 25 QM-01 Molybdenum 81.0 0.5 U 100 ND 81.0 75-125 1.35 25 Nickel 97.6 0.5 U 100 14.9 82.7 75-125 0.938 25 Selenium 80.4 0.5 U 100 ND 80.4 75-125 1.26 25 Silver 77.0 0.5 U 100 ND 77.0 75-125 3.16 25 Thallium 77.0 0.5 U 100 ND 77.0 75-125 1.38 25 Vanadium 135 0.5 100 50.5 84.8 75-125 2.41 25 Zinc 114 0.5 U 100 35.7 78.4 75-125 2.17 25 Batch AAG0224 - EPA 7471A Blank (AAG0224-BLK1) Prepared: 07/27/20 Analyzed: 07/28/20 Mercury ND 0.016 mg/kg LCS (AAG0224-BS1) Prepared: 07/27/20 Analyzed: 07/28/20 Mercury 0.219 0.016 mg/kg 0.200 110 80-120 LCS Dup (AAG0224-BSD1) Prepared: 07/27/20 Analyzed: 07/28/20 Mercury 0.214 0.016 mg/kg 0.200 107 80-120 2.21 20 Excelchem Laboratories. Inc. 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. Laboratory Representative Page 12 of 18