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Excelchem Laboratories,Inc. <br /> DTE Stockton,LLC Project: 2019 Annual Fly Ash Profiling <br /> 2526 W.Washington St. Project Number: 4701254256 Date Reported: <br /> Stockton,CA 95203 Project Manager: Genny Huffinan 04/12/19 16:16 <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]D0092-EPA 6010B <br /> LCS Dup(A]D0092-BSD1) Prepared:04/09/19 Analyzed:04/10/19 <br /> Antimony 21.1 2.0 mg/L 20.0 105 80-120 0.379 25 <br /> Arsenic 21.6 0.2 20.0 108 80-120 0.415 25 <br /> Barium 19.5 0.4 20.0 97.6 80-120 3.37 25 <br /> Beryllium 19.9 0.1 20.0 99.6 80-120 0.100 25 <br /> Cadmium 20.2 0.2 20.0 101 80-120 0.345 25 <br /> Chromium 19.9 0.2 20.0 99.6 80-120 0.351 25 <br /> Cobalt 19.0 1.0 20.0 95.2 80-120 0.105 25 <br /> Copper 18.8 0.4 20.0 94.2 80-120 0.532 25 <br /> Lead 18.3 0.2 20.0 91.6 80-120 0.327 25 <br /> Molybdenum 20.7 0.2 20.0 103 80-120 0.193 25 <br /> Nickel 19.1 0.2 20.0 95.4 80-120 0.314 25 <br /> Selenium 21.7 0.4 20.0 108 80-120 1.74 25 <br /> Silver 17.7 0.4 20.0 88.7 80-120 2.67 25 <br /> Thallium 17.0 0.4 20.0 85.2 80-120 0.176 25 <br /> Vanadium 18.2 0.4 20.0 91.1 80-120 0.330 25 <br /> Zinc 20.0 0.4 20.0 100 80-120 0.349 25 <br /> Matrix Spike(A]D0092-MS1) Source:1904030-03 Prepared:04/09/19 Analyzed:04/10/19 <br /> Antimony 20.7 2.0 mg/L 20.0 0.046 103 75-125 <br /> Arsenic 21.4 0.2 20.0 0.322 106 75-125 <br /> Barium 24.5 0.4 20.0 4.39 100 75-125 <br /> Beryllium 19.5 0.1 20.0 0.004 97.5 75-125 <br /> Cadmium 20.1 0.2 20.0 0.010 100 75-125 <br /> Chromium 19.9 0.2 20.0 0.370 97.5 75-125 <br /> Cobalt 18.7 1.0 20.0 0.076 93.0 75-125 <br /> Copper 19.9 0.4 20.0 1.48 92.1 75-125 <br /> Lead 18.2 0.2 20.0 0.120 90.2 75-125 <br /> Molybdenum 20.3 0.2 20.0 0.084 101 75-125 <br /> Nickel 18.7 0.2 20.0 0.322 91.9 75-125 <br /> Selenium 21.1 0.4 20.0 0.192 105 75-125 <br /> Silver 18.4 0.4 20.0 0.084 91.5 75-125 <br /> Thallium 16.7 0.4 20.0 ND 83.6 75-125 <br /> Vanadium 18.2 0.4 20.0 0.408 88.8 75-125 <br /> Zinc 20.9 0.4 20.0 1.72 96.0 75-125 <br /> Excelchem Environmental Lab. 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 18 <br />