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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 A^D0066-EPA 6010B <br /> LCS Dup(A A D0066-BSD1) Prepared:04/09/20 Analyzed:04/10/20 <br /> Antimony 21.2 2.0 mg/L 20.0 106 80-120 1.38 25 <br /> Arsenic 22.3 0.2 20.0 111 80-120 0.947 25 <br /> Barium 19.3 0.4 20.0 96.3 80-120 1.89 25 <br /> Beryllium 19.2 0.1 20.0 96.2 80-120 0.939 25 <br /> Cadmium 20.4 0.2 20.0 102 80-120 1.13 25 <br /> Chromium 19.7 0.2 20.0 98.5 80-120 1.17 25 <br /> Cobalt 19.2 1.0 20.0 96.1 80-120 1.26 25 <br /> Copper 18.3 0.4 20.0 91.4 80-120 0.714 25 <br /> Lead 18.8 0.2 20.0 94.2 80-120 1.34 25 <br /> Molybdenum 20.2 0.2 20.0 101 80-120 1.20 25 <br /> Nickel 19.2 0.2 20.0 95.8 80-120 1.10 25 <br /> Selenium 22.7 0.4 20.0 113 80-120 1.29 25 <br /> Silver 18.8 0.4 20.0 94.0 80-120 1.18 25 <br /> Thallium 17.4 0.4 20.0 87.2 80-120 1.56 25 <br /> Vanadium 18.8 0.4 20.0 93.8 80-120 0.481 25 <br /> Zinc 20.9 0.4 20.0 104 80-120 0.818 25 <br /> Matrix Spike(A^D0066-MS1) Source:2004044-02 Prepared:04/09/20 Analyzed:04/10/20 <br /> Antimony 21.5 2.0 mg/L 20.0 ND 108 75-125 <br /> Arsenic 22.7 0.2 20.0 0.286 112 75-125 <br /> Barium 26.4 0.4 20.0 6.76 98.3 75-125 <br /> Beryllium 19.4 0.1 20.0 ND 97.0 75-125 <br /> Cadmium 20.8 0.2 20.0 ND 104 75-125 <br /> Chromium 20.2 0.2 20.0 0.478 98.8 75-125 <br /> Cobalt 19.2 1.0 20.0 0.089 95.6 75-125 <br /> Copper 21.0 0.4 20.0 2.50 92.5 75-125 <br /> Lead 18.9 0.2 20.0 0.090 94.0 75-125 <br /> Molybdenum 20.2 0.2 20.0 0.108 101 75-125 <br /> Nickel 19.3 0.2 20.0 0.374 94.5 75-125 <br /> Selenium 22.6 0.4 20.0 ND 113 75-125 <br /> Silver 19.1 0.4 20.0 ND 95.6 75-125 <br /> Thallium 17.2 0.4 20.0 ND 86.2 75-125 <br /> Vanadium 19.2 0.4 20.0 0.452 93.6 75-125 <br /> Zinc 23.2 0.4 20.0 2.79 102 75-125 <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 13 of 19 <br />