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Excelchem Laboratories, Inc. <br />Ancon Environmental <br /> <br />Project: Stockton Diesel Spill <br />570 Business Park Dr. Project Number: 1043326 <br /> <br />Date Reported: <br />Lincoln, CA 95678 <br /> <br />Project Manager: Nolan Ryan 08/07/20 16:16 <br />Total Recoverable Metals - Quality Control <br />Analyte Result <br />Reporting <br />Limit Units <br />Spike Source <br />Level Result %AEC <br />%REC RPD <br />Limits RPD Limit Notes <br />Batch AAG0220 - EPA 6010B <br />Blank (AAG0220-BLIC1) Prepared: 07/27/20 Analyzed: 07/28/20 <br />Antimony ND 0.5 mg/kg <br />Arsenic ND 0.5 <br />Barium ND 0.5 <br />Beryllium ND 0.5 <br />Cadmium ND 0.5 <br />Chromium ND 0.5 <br />Cobalt ND 0.5 <br />Copper ND 0.5 <br />Lead ND 0.5 <br />Molybdenum ND 0.5 <br />Nickel ND 0.5 <br />Selenium ND 0.5 <br />Silver ND 0.5 <br />Thallium ND 0.5 <br />Vanadium ND 0.5 <br />Zinc ND 0.5 <br />LCS (AAG0220-BS1) Prepared: 07/27/20 Analyzed: 07/28/20 <br />Antimony 942 0.5 mg/kg 1003 94.2 80-120 <br />Arsenic 93.4 0.5 If 100 93.4 80-120 <br />Barium 92.3 0.5 II 100 92.3 80-120 <br />Beryllium 92.1 0.5 II 100 92.1 80-120 <br />Cadmium 93.4 0.5 . 100 93.4 80-120 <br />Chromium 95.7 0.5 100 95.7 80-120 <br />Cobalt 95.6 0.5 100 95.6 80-120 <br />Copper 93.6 0.5 II 100 93.6 80-120 <br />Lead 95.6 0.5 100 95.6 80-120 <br />Molybdenum 95.7 0.5 100 95.7 80-120 <br />Nickel 93.7 0.5 U 100 93.7 80-120 <br />Selenium 90.0 0.5 100 90.0 80-120 <br />Silver 95.2 0.5 U 100 95.2 80-120 <br />Thallium 93.9 0.5 100 93.9 80-120 <br />Vanadium 94.7 0.5 100 94.7 80-120 <br />Zinc 91.4 0.5 U 100 91.4 80-120 <br />Excelchem Laboratories. Inc. The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entirety. <br />Laboratory Representative Page 10 of 18