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Excelchem Laboratories,Inc. <br /> DTE Stockton,LLC Project: 2020 Annual Bottom Ash Profiling <br /> 2526 W.Washington St. Project Number: 4700995195 Date Reported: <br /> Stockton,CA 95203 Project Manager: Genny Huffinan 04/10/20 21:23 <br /> STLC Metals-Quality Control <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AAD0066-EPA 6010B <br /> Blank(AAD0066-BLK1) Prepared:04/09/20 Analyzed:04/10/20 <br /> Antimony ND 2.0 mg/L <br /> Arsenic ND 0.2 <br /> Barium ND 0.4 <br /> Beryllium ND 0.1 <br /> Cadmium ND 0.2 <br /> Chromium ND 0.2 <br /> Cobalt ND 1.0 <br /> Copper ND 0.4 <br /> Lead ND 0.2 <br /> Molybdenum ND 0.2 <br /> Nickel ND 0.2 <br /> Selenium ND 0.4 <br /> Silver ND 0.4 <br /> Thallium ND 0.4 <br /> Vanadium ND 0.4 <br /> Zinc ND 0.4 <br /> LCS(AAD0066-BS1) Prepared:04/09/20 Analyzed:04/10/20 <br /> Antimony 20.9 2.0 mg/L 20.0 104 80-120 <br /> Arsenic 22.1 0.2 20.0 110 80-120 <br /> Barium 18.9 0.4 20.0 94.5 80-120 <br /> Beryllium 19.1 0.1 20.0 95.4 80-120 <br /> Cadmium 20.2 0.2 20.0 101 80-120 <br /> Chromium 19.5 0.2 20.0 97.4 80-120 <br /> Cobalt 19.0 1.0 20.0 94.9 80-120 <br /> Copper 18.1 0.4 20.0 90.7 80-120 <br /> Lead 18.6 0.2 20.0 92.9 80-120 <br /> Molybdenum 19.9 0.2 20.0 99.6 80-120 <br /> Nickel 19.0 0.2 20.0 94.8 80-120 <br /> Selenium 22.4 0.4 20.0 112 80-120 <br /> Silver 18.6 0.4 20.0 93.0 80-120 <br /> Thallium 17.2 0.4 20.0 85.8 80-120 <br /> Vanadium 18.7 0.4 20.0 93.3 80-120 <br /> Zinc 20.7 0.4 20.0 104 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 12 of 19 <br />